KR20150061532A - Reservoir system in underground for the storage of highly pressured fluid and CAES system using the same - Google Patents

Abstract

The present invention relates to a high-pressure fluid storage system. According to the present invention, the high-pressure fluid storage system comprises: a first horizontal mine shaft horizontally formed at a constant underground depth; a cavern formed by excavating downward from the first horizontal mine shaft; and a fluid storage tank having a tank body inserted in the cavern to store fluid, a back fill layer formed of back fill materials with which a gap between the tank body and the cavern is filled, and a first plug formed by filling the first horizontal mine shaft with the back fill materials to close the upper part of the cavern. The present invention can store the high-pressure fluid by excavating an underground space to secure airtightness and safety and can improve the utilization of a compressed air energy storage (CAES) system by providing the economically constructible high-pressure fluid storage system.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure fluid storage system and a CAES system using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid storage system for storing gas, oil and the like, and more particularly, to a high-pressure oil storage system capable of storing a high-pressure fluid in an underground space in order to ensure safety and airtightness of compressed natural gas or compressed air .

Stable supply and demand of energy corresponds to the basic infrastructure of the country.

Demand for energy is increasing due to population growth and industrial expansion, but the depletion of natural resources is a limiting factor in the supply of energy.

In this situation, each country 's energy policy tries to solve the imbalance of energy supply and demand in three aspects. The first is to actively develop non-traditional resources such as shale gas and dense gas, facing the limit of development of traditional resources such as oil and natural gas. The second is a way to develop renewable sources of energy, such as wind power, away from fossil fuels. The third is an approach to improving the efficiency between supply and consumption of energy, not the expansion of energy supply, such as the establishment of smart grid using IT information technology. The above methods can be grasped in complementary relationships.

Improving energy efficiency means that energy must be supplied in a timely manner in response to energy demand, which results in energy storage problems. This will be described in detail below.

In the case of base power generation such as thermal power or nuclear power generation, a certain amount of electric energy is generated when the power is once generated, and this amount can not be controlled. Therefore, during peak day of electricity consumption in the daytime, power generation can not solve all of electric power demand, but at nighttime, a significant amount of generated electric power is discarded because power generation greatly exceeds demand. In order to solve the difference between the electricity generation amount and the usage amount difference, it is necessary to store the idle electricity at midnight and compensate the insufficient electric power supply at the peak time of the week.

This requires the storage of electrical energy. Previously, amphibious power generation played an important role in energy storage, but due to environmental problems and limitations of location conditions, it is difficult to expect energy storage by pumped generation.

Compressed Air Energy Storage (CAES) and secondary batteries are emerging as the key to national energy strategy. Currently, CAES is expected to be used for large-capacity energy storage, and secondary batteries are expected to be used for small and medium-capacity energy storage. CAES compresses and stores the air by electricity generated by the baseline power generation such as thermal power generation or nuclear power generation or by means of the electricity generated by the renewable power generation means such as wind power generation, Which is converted into electricity and supplied.

Energy storage has a high correlation with the quality of electricity supply besides the disparity of electricity demand and supply. For example, wind power generation can not produce high quality electricity because the wind time or wind intensity is not constant. In addition, when suddenly large amounts of electricity are produced suddenly through wind power generation, problems such as the disturbance of the frequency of the power system are caused. In terms of solving these problems, energy storage is becoming an important concept.

Accordingly, CAES has a strategic meaning in future energy supply policy in order to increase elasticity of energy supply in connection with base power generation and renewable energy generation power generation.

The CAES power plant currently in operation is the Huntorf power plant in Germany and the McIntosh power plant in the United States, and they use caves made by dissolving rock salt as a compressed air storage space. However, in order to overcome limitations of the intellectual conditions, the CAES storage tank will develop in the direction of underground construction.

One of the important points in the design of compressed air storage facilities is to ensure the safety and confidentiality of compressed air storage facilities. For compressed air reservoirs, safety is the most important issue because the fluid is stored at a minimum pressure of at least 50 bar. In addition, securing the airtightness is another important technical issue because the efficiency of the storage tank is lowered if the fluid compressed at high pressure flows out through cracks formed in the rock mass.

On the other hand, one of the most important issues of the CAES fluid storage plant in practical terms is the economics of construction. It is reasonable to approach energy policy from a strategic point of view rather than the business, but CAES can be much more useful when economic issues are resolved.

An object of the present invention is to improve the utilization of CAES by excavating an underground space and storing a high-pressure fluid to ensure stability and airtightness, and to provide an economically viable high-pressure fluid storage system.

According to an aspect of the present invention, there is provided a high-pressure fluid storage system including: a first horizontal tunnel formed in a horizontal direction at a predetermined first depth of a basement; A cave formed by digging the ground below the first horizontal tunnel; A backing layer formed by a backfill material filled between the tank body and the inner wall of the cabin, and a backfill material filling the first horizontal tunnel to close the upper portion of the cabin. And a first plug formed by the first plug.

According to another aspect of the present invention, there is provided a high-pressure fluid storage system including:

A first horizontal tunnel formed laterally at a first depth of the basement; A second horizontal tunnel formed laterally at a second depth below the first depth; A cave formed by digging a ground between the first horizontal tunnel and the second horizontal tunnel; A backing layer formed by a backfill material filled between the tank body and the inner wall of the cabin, and a backfill material filling the first horizontal tunnel to close the upper portion of the cabin. And a second plug formed by filling backfill material in the second horizontal tunnel to close the lower part of the cabin.

According to the present invention, the plurality of fluid reservoirs are provided so as to be spaced apart from each other along the first horizontal tunnel.

The first horizontal tunnel includes a main tunnel and at least one auxiliary tunnel which is branched from the main tunnel and is formed in a lateral direction, and a plurality of the caban are formed to be spaced apart from each other below the main tunnel or the auxiliary tunnel. .

Further, in an embodiment of the present invention, it is preferable to further include a connection hole formed through the ground from the land surface to the first horizontal tunnel.

According to the present invention, it is preferable that the back fill layer and the first plug are integrally formed by a backfill material.

According to an embodiment of the present invention, the tank body is made of a hermetically sealed material, and a receiving part for storing a high-pressure fluid therein is formed, and a plurality of segments are sequentially laminated and bonded to each other along the longitudinal direction, And a backing layer disposed to surround the tank body, the backing layer containing the reinforcing material.

According to the present invention, there is further provided a plurality of connecting members disposed along the outer circumferential surface of the tank body and spaced from each other along the longitudinal direction of the tank body, and the reinforcing member is installed in the connecting member.

In one embodiment of the present invention, the reinforcing member includes a plurality of transverse reinforcing members disposed to be spaced apart from each other along the longitudinal direction of the tank body, and a plurality of transverse reinforcing members crossing the transverse reinforcing members and connected to the transverse reinforcing members, Wherein the longitudinal reinforcing member is formed by sequentially connecting a plurality of intercepting members along the longitudinal direction, and the intercepting member is installed on the connecting member.

The connecting member may be disposed along the circumferential direction of the tank body, and may be coupled to the outer circumferential surface of the tank body or may be spaced apart from the outer circumferential surface of the tank body, and a mounting portion into which the longitudinal reinforcing member is inserted may be formed. It is preferable that at least one of the plurality of connecting members is coupled to the tank body, and in particular, a connecting member disposed at the lowermost portion is coupled to the tank body.

In one embodiment of the present invention, it is preferable to further include a welding overhang which is attached to the inner or outer surface of the segment so as to protrude from the upper surface or the lower surface of the segment.

In an embodiment of the present invention, a separation membrane is formed on an outer surface of the tank body so that the tank body and the backfill material are not coupled to each other, and at least one of an inner circumferential surface and an outer circumferential surface of the tank body A waterproof membrane formed on an outer circumferential surface of the tank body to prevent the tank body from contacting with water around the tank body; And a heat insulating film formed on at least one of an inner circumferential surface and an outer circumferential surface of the insulating film.

Preferably, the tank body is made of a metal material and further includes a corrosion inhibiting material of a metal material electrically connected to the tank body so as to delay corrosion of the tank body by a galvanic effect .

In one embodiment of the present invention, a support portion provided on the bottom surface of the cabin, and a seating portion formed on the support portion and on which the tank main body is seated, wherein the tank main body is spaced upward from the bottom surface of the cabin And a pedestal for allowing the pedestal to be maintained in a state of being maintained. In particular, it is preferable that the support portion is made of a plurality of plates in which the backfill material is filled in the inside of the pedestal support portion, or a plurality of plates in which a plurality of inflow holes are formed.

According to another aspect of the present invention, there is provided a CAES system comprising: a high-pressure fluid storage system formed at a deep portion of a basement and configured as described above; a high-pressure fluid storage system for compressing air at high pressure, System. ≪ / RTI >

According to the present invention, the utilization of CAES can be increased by providing a practical technique for installing a high-pressure fluid storage plant having a diameter of several meters or more and a height of several tens of meters or more in the deep part of the underground with the stability and airtightness maintained.

Furthermore, the present invention is expected to promote the commercialization of CAES by suggesting a method for constructing a high-pressure fluid storage system economically.

1 is a schematic diagram of a high-pressure fluid storage system according to a first embodiment of the present invention.
2 is a plan view of the first horizontal tunnel viewed from above, as another embodiment of the present invention.
3 is a schematic cross-sectional view of a fluid reservoir in the storage system shown in FIG.
FIG. 4 is a schematic front view of a tank body, a connecting member and a stiffener combined in the high-pressure fluid storage system shown in FIG. 1. FIG.
FIG. 5 is a schematic exploded perspective view for explaining a process in which the segments are coupled to each other.
6 is a schematic cross-sectional view taken along the line aa in FIG.
7 is a schematic cross-sectional view taken along line bb of Fig.
8 is a schematic perspective view of the pedestal shown in Fig.
9 to 11 are perspective views showing another form of the connecting member.
12 is a schematic flow diagram of a method for constructing a high pressure fluid storage system in accordance with an embodiment of the present invention.
13A and 13B are views for explaining a method of constructing the fluid reservoir.
14 is a schematic diagram of a high-pressure fluid storage system according to a second embodiment of the present invention.
15 is a schematic flow diagram of a method for constructing a high-pressure fluid storage system according to a second embodiment of the present invention.

The present invention relates to a method for constructing a high pressure fluid storage system.

In the present invention, the 'storage system' mainly means that a plurality of fluid reservoirs constitute one system, but it is a concept including only one fluid reservoir.

In the present invention, the term 'high-pressure fluid' refers to air compressed at a high pressure of at least 50 bar for CAES operation. However, it does not exclude all compressible fluids such as natural gas, It is not limited to more than 50 bar, but extends to a concept that includes high pressure to such an extent that safety considerations are required even if the pressure is less than 50 bar.

Also, in the present invention, the storage tank is mainly a CAES storage tank for energy storage using compressed air, but it also includes a high pressure storage tank for pure storage which is not connected to a power generation facility.

Hereinafter, a high-pressure fluid storage system (hereinafter, referred to as a "storage system") according to the present invention will be described with reference to a compressed air storage tank in a CAES power generation system.

Figure 1 is a schematic diagram of a high-pressure fluid storage system according to a first embodiment of the present invention, Figure 3 is a schematic cross-sectional view of a fluid reservoir in the storage system shown in Figure 1, Figure 4 is a cross- And a tank body, a connecting member and a reinforcing member are combined in the storage system.

3 and 4, the storage system 500 according to the present invention includes an access tunnel e, a fluid reservoir 100, a first horizontal tunnel 200, and a connection hole 300 .

The access tunnel e is used as a passage for the work vehicle to enter the first horizontal tunnel 200 from the ground. The access tunnel e in this embodiment is formed vertically from the ground as shown in Fig. 1, and an elevator can be installed in the access tunnel e to use it as an entry / exit means. Alternatively, the vehicle can be formed to extend in a gentle slope with a long slope considering the back angle of the vehicle so that the vehicle can be directly driven, or formed in a spiral shape to reduce the installation area.

The first horizontal tunnel 200 is formed along the lateral direction from the first depth of the basement. The term 'horizontal tunnel' does not mean only horizontal direction in the mathematical sense, that is, direction perpendicular to gravity direction, and includes a case where there is a gentle slope with respect to 'horizontal direction'. This is referred to as 'transverse direction' in the present invention. The first horizontal tunnel 200 is used as a work space necessary for excavating the cabon c and manufacturing the fluid reservoir 100. When the installation of the fluid reservoir 100 is completed, the first horizontal tunnel 200 is closed and used as a space in which the first plug 90 is installed.

The connection hole 300 is formed through the ground through drilling or the like from the surface to the first horizontal tunnel 200. It is not always necessary to excavate the connection hole 300 after the first horizontal tunnel 200 is formed in the order of construction and the inverted connection hole 300 is formed first and then the first horizontal tunnel 200 is excavated You may. In the present embodiment, a plurality of connection holes 300 are provided apart from each other along the first horizontal tunnel 200. The connection hole 300 interconnects the first horizontal tunnel 200, which is used as a work space, with construction equipment prepared on the ground, such as a crane, a concrete injection facility, and an excavation equipment. For example, the main body of the crane is installed on the ground, and the pull string of the crane is inserted into the first horizontal tunnel 200 through the connection hole 300. In addition, the main body of the excavation equipment for excavating the ground by the rotation method is installed on the ground, and in the state where the excavating head of the excavation equipment is disposed in the first horizontal tunnel 200, (300) to provide power.

The fluid reservoir 100 is for storing compressed air at a high pressure and is formed below the first horizontal tunnel 200. In the present invention, the fluid reservoir 100 is formed in the longitudinal direction (a direction slightly tilted with respect to the vertical direction and the vertical direction). Although the fluid reservoir 100 may be installed in a single unit, it is preferable that a plurality of the fluid reservoirs 100 are installed considering economical efficiency of the construction. In an embodiment of the present invention, a cave (c) is formed by excavating a ground using a building facility connected through a connection hole (300) while utilizing the first horizontal tunnel (200) The fluid reservoir 100 is installed.

Particularly, in the present invention, the first plug 90 for closing the upper part of the cabon c is formed by using the first horizontal tunnel 200. That is, both ends of the first horizontal tunnel 200 located on the upper side of the cabin c are closed to form a space, and then a filling material such as concrete is placed in the closed space to manufacture the first plug 90 .

As described above, the method of forming the first horizontal tunnel 200 and forming the fluid reservoir 100 in the vertical direction below the first horizontal tunnel 200 includes a method of forming a fluid reservoir vertically directly from the surface It is very advantageous in terms of economy and stability.

The technique of excavating the ground in a vertical form can be divided into two parts by blasting and by rotating a bited head to excavate the rock. In the case of the blasting method, there is a top-down method of excavating from the surface to the bottom, and a bottom-up method of forming a separate access tunnel upside down and digging upward from the lower end. If both the upward blasting and the downward blasting are deep, the blasting operation itself is difficult, and it is difficult to dispose of the crushed rocks due to the blasting. Also, blasting can not always be free from complaints. As an alternative to blasting, it is difficult to apply large-area construction with a large diameter of cavern because of technical limitations, and construction costs are increased. In particular, in the case of high-pressure fluid reservoirs, it is not necessary to excavate from the surface to the upper end of the cavern, since it starts at depths of several tens meters and forms the caverns downward. However, since the existing excavation equipment is installed on the ground, it has to be excavated from the surface to the upper part of the cavern. It was here that the construction economics were significantly reduced. Therefore, when a fluid reservoir is conventionally constructed, a method of vertically forming a cavern from the ground downward is not adopted.

The present invention improves the economics of construction by deriving a practical method for avoiding excavation from the surface to the upper part of the cave while using a drilling rig. That is, it is not necessary to excavate from the land to the upper end of the caravan by excavating the horizontal tunnel 200 after forming the access tunnel. In this construction method, for example, while using the vertical excavation equipment disclosed in Korean Patent Nos. 0683909, 1068578 and 1334298, the main body of the excavation equipment is installed on the ground and only the head portion After being installed in the first horizontal tunnel, the head portion and the main body portion can be connected through the connection hole 300, so that the vertical excavation equipment can be fully used. The above-mentioned vertical excavation equipments are not intended to be used separately as described above, and although there is no actual construction experience, the present inventors considered that it is possible to separate vertical excavation equipments from a sufficient consideration of the mechanical structure . In addition to the equipment disclosed in the above-mentioned Korean patent, a head portion that pivots while actually grinding a rock mass and a body portion that provides power to the head portion can be manufactured in a form separated from each other in a first horizontal tunnel on the ground and underground I expect it. In addition, the present invention does not exclude the possibility that the vertical excavation equipment can be introduced into the first horizontal tunnel according to the miniaturization of the equipment to perform excavation.

As described above, a length that can not be excavated from the land surface to the upper end of the cabin through the first horizontal tunnel entry of the excavation equipment through separate installation of the head portion and the body portion of the excavation equipment or miniaturization of the excavation equipment can be provided.

In this way, when comparing the construction method of excavating the cave from the first horizontal tunnel by forming the first horizontal tunnel at the first depth of the basement and the method of excavating the vertical cave directly from the surface, one consideration is It is an increase in the construction cost due to the formation of the access tunnel e and the first horizontal tunnel 200. It is not necessary to excavate from the surface to the upper end of the caravan, but the construction economics may deteriorate while forming the access tunnel e and the first horizontal tunnel 200. Therefore, it is advantageous to use a plurality of fluid reservoirs for constructing compressed air storage plants of a certain scale or more, rather than forming a single fluid reservoir.

On the other hand, another advantage of the method of forming the fluid reservoir from the first horizontal tunnel downward after forming the first horizontal tunnel is the stability associated with the plug. When the plug is formed on the fluid reservoir after vertical excavation from the surface, the upper part of the plug becomes empty. That is, there is a need for caution in the plug design because the plug has to withstand the pressure above the fluid reservoir. However, when a plug is directly installed in the first horizontal tunnel, since the rock is formed above the plug, there is an advantage that the safety is excellent.

In addition, the formation of a vertical cavern in the basement makes it possible to form plugs on the sides of the upper and lower sides of the cabin to connect with access tunnels, except for the excavation from the ground surface. The plug size is much larger than the access tunnel There is a problem that the access tunnel must be re-opened because there is a required shape such as a tapered shape or a wedge shape. However, in the present invention, due to the structural stability, the first horizontal tunnel may be closed as it is, and concrete may be installed to form the first plug.

As described above, the construction method according to the present invention forms a first horizontal tunnel 200 after approaching the first depth of the ground through the access tunnel e, and is installed on the ground through the connection hole 300 There is a technical feature that the fluid reservoir 100 is vertically installed below the first horizontal tunnel 200 while using building equipment. In addition, when a plurality of fluid reservoirs are installed to form a storage plant, compared with the case of forming one fluid reservoir, the economical efficiency of construction is remarkably improved and safety of the fluid reservoir is also increased.

1, a plurality of fluid reservoirs 100 are installed in a single first horizontal tunnel 200. However, as in the embodiment shown in FIG. 2, Can be arranged in various ways. 3 is a plan view of the first horizontal tunnel viewed from above.

Referring to FIG. 2, the first horizontal tunnel includes a main tunnel 210 and an auxiliary tunnel 220. The main tunnel 210 is formed bi-directionally from the access tunnel e and the auxiliary tunnel 220 is branched from the main tunnel 210 in the lateral direction. The fluid reservoir 100 is formed below the auxiliary tunnel 220 and the auxiliary tunnel 220 is closed to form the first plug 90.

Although not shown, in another embodiment, a combination of forming the fluid reservoir in the lower part of the main tunnel and the auxiliary tunnel may be considered.

Hereinafter, with reference to the drawings, a specific configuration of a fluid storage tank 100 (hereinafter referred to as a storage tank) employed in the storage system 500 according to an embodiment of the present invention will be described.

The reservoir 100 employed in an embodiment of the present invention includes a tank body 10, a stiffener 30, a back fill layer 50,

The tank body 10 forms a closed internal space to provide a space for storing compressed air. The tank body 10 is disposed in the vertical direction, preferably in the vertical direction, and buried in the caverns c formed on the rock g of the basement part. The depth of the tank body 10 (the point where the upper end is disposed) is related to safety and economy.

The depth and height of the tank body 10 are determined depending on the storage pressure and capacity of the compressed air. In this embodiment, the depth of arrangement of the tank body 10 is about 30 to 60 m, May be formed to have a diameter of 3 to 8 m and a height of 100 to 200 m.

One of the most important roles of the tank body 10 is to maintain the airtightness of the compressed air. Accordingly, the tank body 10 is made of a material such as steel, rubber, and plastic that can prevent leakage. In this embodiment, the tank body 10 is made of steel having a thickness of 4 to 10 mm. However, since the tank body 10 itself does not withstand the pressure of the compressed air due to its rigidity, the thickness of the steel may be thinner, It can be formed of the same soft material.

In addition, the shape of the tank main body 10 may be formed in various shapes. In this embodiment, the tank main body 10 is formed in a cylindrical column shape so that the pressure is not concentrated on one side, and the upper and lower portions are dome-shaped.

Backfill material is filled between the tank body 10 and the inner wall of the cabin c to form a backfill layer 50. The back fill layer 50 acts to transfer the pressure of the tank body 10 to the rock mass g. Therefore, it is important that the backsheet layer 50 is completely filled with the backfill material without any empty space. In this embodiment, the back fill layer 50 is formed to a thickness of about 30 to 100 cm. Concrete is widely used for backfill, but various kinds of grout materials such as cement milk and mortar can be used. That is, any hydraulic material that can be cured by reacting with water can be used as a backfill material. However, in selecting the backfill material, it is desirable to select a material that can be formed with a low porosity of the backfill layer after curing in consideration of stability and airtightness. Particularly, when the porosity is large, groundwater can easily flow into the tank body 10 from the rock mass, which is not preferable.

It is preferable that the reinforcement 30 is embedded in the back fill layer 50. However, the stiffener may be omitted depending on the condition of the rock and the pressure condition of the fluid stored in the tank body 10. [ Backfill materials are mainly composed of cement. Cement is strong in compressive stress but very weak in tensile stress. Therefore, in order to reinforce the tensile force of the backsheet layer 50, it is preferable to contain reinforcing materials 30 such as reinforcing bars and wire meshes. The reinforcing bars are arranged in a lattice shape in the horizontal and vertical directions and are arranged so as to enclose the tank main body 10. The tensile force applied to the backsheet layer 50 mainly acts in the tangential direction of the tank body 10, and cracks in the backsheet layer 50 can be mainly formed in the up and down directions. Therefore, the reinforcing member 30 is disposed in the lateral direction (circumferential direction of the storage tank) rather than in the longitudinal direction (the longitudinal direction of the storage tank), which is more important in terms of tensile strength reinforcement.

On the other hand, the inner wall of the rock mass g can form a supplementary layer 40 by spraying a quick-hard material such as a shotcrete when there is a possibility of collapse or soil collapse during excavation.

A separation membrane 60 may be formed between the tank body 10 and the backsheet layer 50. The separation membrane 60 prevents the tank body 10 from being coupled to the backing layer 50 so as to attenuate the shearing force on the friction surface where the tank body 10 contacts the backing layer 50. It is not preferable that the tank body 10 and the back fill layer 50 are physically connected to each other without a space therebetween. That is, when pressure is applied to the tank main body 10 by the compressed air, a shearing force is generated at the contact surface between the tank main body 10 and the back fill layer 50 to cause physical damage to the tank main body 10. However, If the backing layer 10 and the backing layer 50 are not bonded to each other and are separated from each other, the pressure is dispersed and the shearing force can be attenuated. In this embodiment, the separation membrane 60 is formed by applying a fluid material such as bitumen or grease to the outer wall of the tank body 10 or by using a film or sheet of material not bonded to the cement, As shown in Fig.

A waterproof film 81 is formed between the separation membrane 60 and the backing layer 50 to prevent corrosion of the tank body 10 due to the inflow of groundwater. The waterproof film 81 can be formed by applying a waterproofing agent or attaching a waterproof sheet. In order to prevent corrosion of the tank body 10, a corrosion inhibitor may be applied to at least one of the inner circumferential surface and the outer circumferential surface of the tank body 10 in addition to the waterproof film 81 to form the rust preventive film 82.

In addition, the temperature of the fluid stored in the tank body 10 is increased during the compression process. In order to prevent the temperature of the fluid from dropping due to heat exchange with the surroundings, at least one of the inner circumferential surface and the outer circumferential surface of the tank body 10 (83) can be formed. The heat insulating film 83 is also formed by attaching or applying a heat insulating material.

The complementary layer 40, the separation membrane 60, the waterproof film 81, the anticorrosive film 82 and the heat insulating film 83 may all be selectively applied or partially applied according to the conditions, May not all be applied.

The rust preventive film 82 is first formed on the inner side surface and the outer side surface of the tank body 10 and the heat insulating film 83 and the separating film 82 are sequentially removed from the surface of the rustproofing film 82 outside the tank body 10, (60). A waterproof film 81 is formed on the surface of the separation membrane 60 and a supplementary layer 40 is formed on the inner wall of the rock mass g. According to the embodiment, a thin film foil (not shown) of a non-synthetic material such as aluminum is interposed between the waterproof film and the anticorrosive film to prevent the waterproof film and the anticorrosive film from being mechanically bonded. The foil is a waterproof material and can perform the function of the waterproof film 81 and the separator 60 together.

A pedestal (20) is installed on the bottom of the cabin (c). The pedestal 20 is for keeping the tank main body 10 away from the bottom surface of the cavan c.

On the other hand, a first plug 90 is provided at an upper portion of the tank main body 10 to close the upper side of the tank main body 10. A pipe (p) for air inflow and outflow is inserted into the tank main body (10), and this pipe (p) is connected to an air compression facility and a power generation facility provided on the ground.

Although the specifications and materials of the high pressure fluid reservoir have been described above, these standards and materials are merely examples, and various specifications and materials may be adopted according to the embodiments.

The present invention is based on studies on how to construct / construct the storage tank 100 having the above-described structure and how to construct the storage tank 100 economically.

As described above, the height of the tank body 10 is about 100 to 200 m. When considering the arrangement depth of the tank body 10, at least 150 m or more should be excavated downward from the ground to form the cavern c. It is technically not easy to excavate a cavern having a diameter of 7 to 8 m vertically at about 150 m, but it is very difficult to insert the tank main body 10 into the cavern c.

Oil storage bases, etc. However, oil reservoir bases have a much more relaxed condition than compressed air in terms of pressure resistance and airtightness, so no hermeticity tank is introduced, and mainly concrete lining is used only for underground lining To the end.

However, compressed air is required to ensure airtightness. Therefore, it faces a completely different technical task from that of oil storage bases such as introducing airtight tanks. First, there is a problem of feasibility in how a tank body having a height of 100 to 200 m and a reinforcing material surrounding the tank body can be installed in the cabin. There is no experience in actual construction of enclosure tank main body and reinforcing material in cabon having diameter of 5 ~ 8m and height of 150 ~ 200m even in domestic as well as overseas. This scale is not just a difference in size, but a question of whether construction is possible.

In addition, even if construction is possible, if a serious disadvantage is brought about in economical efficiency, the practical use of the industry is lowered, so that the problem of construction economics is sharply pointed out.

Let's just look at the problem of installing the tank body in the cave under the condition that the cave is drilled perpendicular to the basement. The tank body having a height of 100 m or more can not be manufactured as an integral type, and the segments must be joined by welding or the like. Welding quality is critical to airtightness, so it is advantageous to manufacture in a factory with perfect working conditions, but it is impossible to transport large-scale tank bodies manufactured at the factory.

If so, welding can be performed on-site. However, it is technically not easy to lift a tank of 150m height after the tank is manufactured and insert it into the cabin. The crane for hanging the tank body should be about 200m high, and the weight of the crane is too large because the tank body is made of steel. Tower cranes for high-rise building construction can afford the height but will not be able to afford the weight. Although the Goliath crane of the shipyard can do this, the use of the Goliath crane is virtually impossible considering the economic conditions.

Alternatively, welding may be performed with the segments inserted sequentially into the caban, but considering the narrow workspace and environment of the caban, it is difficult to expect the quality of the core welding to maintain airtightness. However, widening the caban is unrealistic because it brings inefficiency, and it can cause problems in stability.

In the case of reinforcing materials, there is a more difficult problem. It is also very difficult to install a vertical stiffener 150 m apart from the tank body. Even if reinforcing steel is used as the reinforcing material, it is difficult to keep the desired shape by bending the middle portion at a height of about 150 m. However, if all of the vertical stiffeners are fixed to the inner wall of the rock, the work process becomes very complicated and not only the air is lengthened, but also the construction economical efficiency is inevitably lowered.

Although some examples are given above, this is one of the most typical problems that can be encountered in construction. Installing a tank and a reinforcement of 150m in a narrow space of 5 ~ 8m diameter in a cave will cause many difficulties in feasibility and economics.

That is, the fluid reservoir 100 manufactured according to the present invention can be seen to be very simple considering only the structural aspect after the completion, but if it is actually constructed, it will experience the limitation of the construction technique.

A construction method according to the present invention for embedding a tank body of more than 100 m in a cave over 150 m and a structure of an optimized tank body for ensuring the feasibility and economical efficiency of this construction method were studied together.

In terms of the construction method, the cave (c) is filled with water and the buoyancy is used to float the segments on the water surface of the cave (c), and then the segments are sequentially laminated and bonded together. The float force is adjusted and settled while water is being filled in the manufactured part where welding is completed, and only the upper part of the manufactured part is floated above the water surface so that welding with other segments can be performed on the surface. A method of stably manufacturing the tank main body in the cave (c) using such buoyancy is provided. The construction method will be described later in detail.

And we developed an optimized segment structure for implementing buoyancy construction method. However, the configuration of the high-pressure fluid reservoir or the configuration of the segment to be described below is merely an example. That is, it is noted that the construction method according to the present invention is a method aspect in which floats are floated using buoyancy and the layers are stacked one after another, so that the detailed mechanical configuration of the fluid reservoir can be variously changed.

The optimum storage tank 100 for applying the construction method developed by the present inventor is formed by stacking a plurality of segments in a tank main body 10 and connecting the reinforcing member 30 through the connecting member 70 Are formed in a structure that can be supported in the segments. In addition, the reinforcing member 30, particularly the longitudinal reinforcing member 32, is structured such that a plurality of the intercepting members 33 are connected to each other, so that the intercepting members can be easily joined to each other by the connecting member 70. The separator 60, the waterproof film 81, the rustproof film 82, the heat insulating film 83, and the like are previously formed in the segments constituting the tank main body 10. I will explain in detail.

The tank body 10 is made up of a plurality of segments, the segments being made of steel and comprising a lower segment 11, a plurality of torso segments 12 and an upper segment 13. The lower segment 11 forms a lower end of the tank body 10 and is formed in a bowl shape whose upper surface is opened. The trunk segment 12 forms a trunk portion of the tank body 10, and is formed in a ring shape in which both the upper surface and the lower surface are opened. The body segments 12 consist of a plurality of body segments 12, which are sequentially stacked on the lower segment 11. The upper segment 13 forms the upper end of the tank body 10 and is laminated onto the body segment 12. The upper segment 13 is in the form of an inverted lower segment 11, that is, a bowl in which the lower surface is open. When the lower segment 11, the plurality of torso segments 12 and the upper segment 13 are laminated, a sealed space 14 in which a high-pressure fluid is stored is formed in the tank main body 10.

Each of the segments (11, 12, 13) is provided with a welding overhang (15). When laminating the segments together, they are butt welded to the gap with the segments spaced slightly apart. When doing butt welding, a backing plate is needed to prevent the gap. As a result, as shown in Fig. 6, the welded overhang 15 is protruded to block the spaced-apart gap from the adjacent segment. In Fig. 6, a portion indicated by w is a portion where welding is performed. The welding collapse member 15 may be provided so as to protrude above or below the segments. In the case of welding the segments at the outer side, the welding splice member 15 should be attached to the inner side of the segment, and when welding from the inner side, the welding splice member 15 should be attached to the outer side of the segment do. In the case of welding the ring-shaped segments, it is advantageous in terms of ease of operation to weld at the outer surface of the segments. In this embodiment, the welding overhang members 15 are attached to the inner surfaces of the segments.

Spacers (s) for adjusting spacing are detachably attached to the upper or lower end of each of the segments (11, 12, 13). As described above, the segments must be spaced apart for welding between the segments. When a segment to be newly welded is placed on an initially bonded segment using a crane or the like, the spacing s can be used to determine the spacing between the segments. That is, when the two segments are brought into contact with the spacer s in a state where the spacer s is attached to the lower end of the newly welded segment or the upper end of the welded segment, the welding gap is accurately formed. In this state in which the spacing is formed, the spacers s are separated and then the welding is performed.

On the other hand, the pedestal 20 can be selectively provided to keep the tank body 10 away from the bottom surface of the cavern c. The function of the pedestal 20 is to prevent the tank body 10 from being in intimate contact with the bottom surface of the cavern c but to separate the tank bottom 10 from the bottom surface of the cavern c, ). When the back fill layer is poured in advance on the bottom surface of the cavan c before the tank main body 10 is buried or when the back filling material is charged in a state in which the tank main body 10 is suspended from the bottom surface of the cavan c The pedestal 20 is not necessarily required.

However, in order to easily apply the present construction method, it is preferable to provide a pedestal 20. The reason for this will be explained in detail when explaining the construction method, and only the structure will be explained here.

8, the pedestal 20 has a support portion 21 provided on the bottom surface of the caban c and a seating portion 22 formed on the support portion 21. As shown in Fig.

Since the backfill material is to be filled in the inside of the supporting part 21, the supporting part 21 is formed in a lattice shape using a reinforcing bar or the like so that the backfill material is filled between the reinforcing bars. Alternatively, as shown in Fig. 8, the support portion 21 is formed by a plurality of plates, and a plurality of inflow holes 23 into which the backfill material can flow can be formed on the plate.

 It is preferable that the seat portion 22 has a shape corresponding to the lower end portion of the tank main body 10 because the tank main body 10 is placed in the seat portion 22. [ As shown in Fig. 9, the seat portion 22 has a bowl shape corresponding to the lower end portion of the tank body 10. As shown in Fig. Although not shown, a spherical sheet may be provided on the seating part 22 so that the tank body 10 can be equally placed. The spherical sheet is intended to allow the core to be vertically biased when the compressive strength of the concrete core is tested by maintaining the core in a balanced arrangement.

In another embodiment, the seat portion may be formed in a ring shape having a diameter smaller than the diameter of the tank body 10. [ The tank body may be seated on a ring-shaped seat.

The stiffener 30 is intended to reinforce the tensile strength of the backsheet layer 50. As described above, concrete or the like used as a backfill material is strong against compressive force but weak against tensile force. A reinforcing material 30 such as a reinforcing bar or a wire mesh is embedded in the backing layer 50 to improve the tensile strength of the backing layer 50. [ Accordingly, the reinforcing member 30 is installed so as to surround the tank main body 10 away from the tank main body 10. When the pedestal 20 is provided as in the present embodiment, the reinforcing member 30 surrounds the tank body 10 except for the pedestal portion and serves as a stiffener in which the pedestal 20 is disposed at the lower end of the tank body 10 . And if the pedestal is not provided, the tank body 10 is completely enclosed.

In the present embodiment, the reinforcing member 30 is composed of the transverse reinforcement member 31 and the longitudinal reinforcement member 32. The transverse reinforcement members 31 are formed along the circumferential direction of the tank main body 10 and are arranged in plural along the longitudinal direction of the tank main body 10 so as to be spaced apart from each other. The longitudinal reinforcing members 32 are disposed so as to intersect with the transverse reinforcing members 31 and are disposed apart from each other along the circumferential direction of the tank body 10. The transverse reinforcement member 31 and the longitudinal reinforcement member 32 are joined to each other and connected together. That is, the reinforcing member 30 is formed in a net shape as a whole by the transverse reinforcing member 31 and the longitudinal reinforcing member 32 to wrap the tank main body 10.

One horizontal reinforcement member 31 may be integrally formed because it is approximately 9 to 10 m in consideration of the diameter of the tank main body 10 but the longitudinal reinforcement member 32 must correspond to the entire height of the tank main body 10 It should be about 150 m long. Therefore, it is difficult to integrally form the longitudinal reinforcing member 32, and a plurality of the intercepting members 33 are connected to each other.

A connecting member 70 is provided to facilitate installation of the reinforcing member 30 in a state where the reinforcing member 30 is separated from the tank main body 10. [ More specifically, the connecting member 70 serves as a medium for supporting the reinforcing member 30, which is connected to the net as a whole, to the tank body 10. [ Since the reinforcing member 30 is connected to the transverse reinforcing member 31 and the longitudinal reinforcing member 32 by a single net, when the connecting member 70 is coupled to a part of the reinforcing member 30, And can be supported by the main body 10. Accordingly, the connecting member 70 for performing such an operation may be formed in various forms. Various configuration examples of the connection member will be described later, and the connection member 70 employed in this example will be described first.

The connecting member 70 employed in the present embodiment is not limited to the basic function of supporting the entire reinforcing member 30 by being coupled to a part of the reinforcing member 30 and the intercepting members 33 constituting the longitudinal reinforcing member 32 can be easily And a function is added so that they can be mutually joined to each other.

In this embodiment, the connecting members 70 are formed in a ring shape and enclose the tank main body 10, and a plurality of connecting members 70 are disposed apart from each other along the longitudinal direction of the tank main body 10.

The plurality of connecting members 70 may be arranged one for each of the segments, or one for each of several segments. Also, the connecting member 70 may be coupled to the segment, or may surround the segment in a state separate from the segment. It is preferable that at least one of the plurality of connecting members 70 is coupled to the segment, and in particular, the connecting member 70 is coupled to the lower segment 11.

The connecting member 70 is coupled to the lower segment 11 and the connecting member 70 is coupled to the segment at several segment intervals along the height direction of the tank body 10. [ And the remaining connecting members 70 are not engaged with the segments but serve as joints for mutually joining the slice members 33 together. For convenience of explanation, the connecting member to be connected to the segment is denoted by reference numeral 71, and the connecting member which is not engaged to the segment is denoted by reference numeral 72.

In this embodiment, the connecting member 71, which is coupled to the segments, has a cross-section of approximately 'C' or 'C' shape and is joined to the outer peripheral surface of the segment. Accordingly, a space in which the piece member 33 can be inserted is provided inside the connecting member 71. This space is referred to as a mounting portion 73. In addition, since the connecting member 72 which is not coupled to the segments is formed in a hollow tube shape, a mounting portion 73, which is a space into which the segment members 33 can be inserted, is also formed therein.

Insertion holes 74 and 75 are formed in the upper and lower portions of the connecting members 71 and 72 so that the slice member 33 can be inserted into the mounting portion 73, respectively. The insertion holes 74 and 75 are continuously arranged at regular intervals along the circumferential direction of the connecting member. A lower end portion of the intercepting member 33 disposed at the upper portion is inserted through the insertion hole 74 formed at the upper portion and the upper end portion of the intercepting member 33 disposed at the lower portion through the insertion hole 75 formed at the lower portion is inserted.

Also, in this example, the upper insertion hole 74 and the lower insertion hole 75 are disposed so that their center points are spaced from each other. Therefore, as shown in Fig. 7, the slice members 33 are disposed on the mounting portion 73 of the connecting members 71 and 72 so as to overlap with each other.

Further, a separate hole is formed beside the upper insertion hole 74, which is an injection hole 76 for injecting resin (r) into the mounting portion 73. That is, when the resin r is injected through the injection hole 76 in a state where the two intercepting members 33 are arranged so as to overlap with each other, the two intercepting members 33 are separated by the resin r in the mounting portion 73, Respectively. When the mounting portions inside the connecting members 71 and 72 are all communicated over the entire connecting members 71 and 72, the injection holes 76 may not be formed for every insertion hole. However, when the partitioning part d is provided inside the connecting members 71 and 72 so that the mounting part 73 separated separately for each of the insertion holes 74 and 75 is formed, the injection hole 76 is provided for each of the insertion holes 74 and 75, .

It is undesirable that an empty space is formed in the connecting members 71 and 72. Therefore, when the mounting space is provided inside the connecting members 71 and 72 as in the present embodiment, the mounting portions should be filled with resin or backfill material. Therefore, a plurality of holes are formed in the connecting member so that the backfill material can be charged into the portion where the resin is not filled. Or the connecting member is not hollow so that no space is formed inside the connecting member other than the mounting portion.

As described above, in the present embodiment, the resin r is charged in the state that each of the slice members 33 constituting the longitudinal reinforcing member 32 is inserted into the insertion holes 74, 75 of the connecting members 71, And one longitudinal reinforcing member 32 can be formed by integrally connecting the piece members 33 in a very simple manner. Since the several connecting members 71 support the longitudinal reinforcing member 32 while being coupled to the segments, the longitudinal reinforcing member 32 formed at a height of about 150 m can maintain the desired shape without bending. If all the connecting members 71 are coupled to the segments, the supporting force against the longitudinal reinforcing member 32 can be further increased. The transverse reinforcement member 31 may be coupled to the longitudinal reinforcement member 32 provided along the circumferential direction by wire or the like.

In this embodiment, the connecting member provides a function of joining the segment members forming the longitudinal reinforcing member 32 very simply and easily, in addition to the basic function of supporting the reinforcing member to the tank body in a state of being separated from the tank body .

In the classical method not using the connecting member as in the present embodiment, the longitudinal reinforcing member 32 must be supported on the inner wall of the rock by using a separate fixing means, which is a technical and economic difficulty. Also, even if it is supported on the tank main body, it is not economical to use all of the slice members by welding or reinforcing bars unless the mounting portion and the resin are used as in the present embodiment. In other words, the operation of connecting the piece pieces 33 integrally by the connecting member having a unique structure adopted in the present embodiment can be performed very easily, and the economical efficiency of the construction can be improved.

In this embodiment, the waterproofing agent, the rust preventive agent, and the heat insulating material are applied in advance in a segment unit so that the waterproof film 81, the rustproofing film 82 and the heat insulating film 83 are formed in the tank body 10 can do. Likewise, if a separation membrane 60 is formed in a segment unit and all the segments are combined, a separation membrane is formed on the entire tank body 10.

In this embodiment, only the rustproofing film 82 is formed on the inner peripheral surface of the segment, and the rustproofing film 82, the heat insulating film 83, the separating film 60, and the waterproofing film 81 are sequentially formed on the outer peripheral surface.

On the other hand, not only the gas is accommodated in the storage tank 100 according to the present embodiment, but water may be accommodated together with air depending on the type of the power generation facility using compressed air. Even if the waterproof membrane and the rustproof membrane are provided, the storage tank 100 can be exposed to groundwater. Therefore, when the tank body 10 made of steel is used for a long time, corrosion may be a problem. In this example, the galvanic effect is used to suppress the corrosion of the tank body. That is, although not shown, a corrosion inhibitor (sacrificial anode) made of a metal material is provided so as to be electrically connected to the inside or the outside of the tank body 10. The corrosion inhibitor may be directly attached to the tank main body as long as it is electrically connected to the tank main body. However, the corrosion inhibitor may be mutually connected by the conductor in a state of being separated from the tank main body. Since the corrosion inhibitor has an active potential as compared with the material of the tank main body, the corrosion inhibitor acts as an anode and the tank body 10 acts as a cathode so that the corrosion inhibitor is rapidly corroded and the tank body 10 is inhibited from corrosion . Since the corrosion inhibitor is consumed by the corrosion after a lapse of a predetermined time, it is preferable that the corrosion inhibitor is configured to be replaceable. In order to facilitate the replacement of the corrosion inhibitor, it may be rather advantageous that the corrosion inhibitor is located outside and is electrically connected to the tank body rather than directly attached to the tank body.

On the other hand, the upper part of the cavern (c) pours concrete to form and close the first plug (90). Of course, the pipe (p) connected to the tank main body (10) is connected to the electricity generation facility and the compression facility of the land via the first plug (90).

As described above, the structure of the storage tank according to the present invention is characterized in that the tank body is formed by laminating segments in layers, and a rust prevention membrane, a waterproof membrane, a separation membrane and a heat insulating membrane are previously formed in the segments, So that a film having various functions can be formed. In addition, the longitudinal reinforcing member and the transverse reinforcing member are provided in advance in the segment, and the reinforcing member is supported by the segment so that the manufacture of the tank main body and the installation of the reinforcing member can be performed at the same time. It is advantageous in terms of construction because it can be installed very easily with the reinforcing material separated from the tank main body. In addition, the advantage of the construction is increased in that the slice members forming the longitudinal stiffening member can be connected very easily by the unique structure of the connecting member. As described above, by providing the tank body and the reinforcement member in units of segments and slab members, it is possible to find the significance in improving the feasibility and economical efficiency of the construction.

9, the connecting member 70a may be integrally formed with the tank main body 10, as shown in FIG. 9, and the connecting member 70a may be formed integrally with the tank main body 10, Or may be provided in a plurality of locations spaced apart from each other along the circumferential direction of the housing. The mounting portion is provided inside the connecting member 70a of an independent shape, and the insertion hole and the injection hole are formed as described above.

In addition, although it has been described and illustrated that the mounting members are formed inside the connecting member so far as the connecting members are mutually joined in the mounting portion, as shown in FIG. 10, the connecting member 70b is simply formed with the through- The member may be inserted into the through hole 77 in a long manner. Or the longitudinal reinforcing member may be divided into several long sections (formed relatively longer than the front section members), the sections may be inserted into the through holes 77, and the sections may be connected by welding or the like.

Further, as shown in Fig. 11, the connecting member 70c may be applied in such a manner that the transverse reinforcement member 31 is supported. A plurality of connecting members 70c are formed along the longitudinal direction of the tank main body 10 and are spaced apart from each other in the circumferential direction of the tank main body 10 and the through holes 78 are formed in the connecting members 70c, The transverse reinforcement members 31 can be inserted into the through holes 78 and supported. The longitudinal reinforcing member 32 can be supported in a state connected to the transverse reinforcing member 31.

In another example, a connecting member for supporting the transverse reinforcing member and a connecting member for supporting the longitudinal reinforcing member may be provided, respectively.

Although not shown, in another example, a method may be used in which a through hole is simply formed in the connecting member, and the slice member is fixed to the connecting member in a state where the slice member is fitted in the through hole. That is, the upper end portion and the lower end portion of the slice member are bolted to the upper end portion and the lower end portion of the slice member, respectively, in a state of protruding through the linking member of the upper segment and the lower segment. The bolt fastened to the upper end of the piece member will contact the upper surface of the upper connecting member and the bolt fastened to the lower end of the piece member will contact the lower surface of the lower connecting member. Therefore, the slice member is fixed between the two connecting members by the bolt, and the movement in the vertical direction is restricted. And, even if the bolts are not tightened, the slice member fitted in the through hole of the connecting member can be fixed to the connecting member by welding.

Hereinafter, a method for constructing the fluid reservoir 100 below the first horizontal tunnel will be described.

FIG. 12 is a schematic flow chart of a method for constructing a high-pressure fluid storage system according to an embodiment of the present invention, and FIGS. 13A and 13B are views for explaining a method of constructing a fluid reservoir.

Referring to the drawings, the reservoir construction method includes an excavation step M10, a filling step M30, a tank manufacturing step M50, and a backfill step M70.

In the excavation step M10, the ground is excavated from the first horizontal tunnel to form the caban c along the vertical direction, preferably the vertical direction.

In the present invention, as described above, a method of excavating in a downward direction from the first horizontal tunnel using vertical excavation equipment can be adopted. Vertical excavation equipment is also advantageous in buckling because the bits of the excavation equipment are drained to the top through the water injected when the rock is drilled. In addition to the equipment described in the above patent, a caravan of approximately less than 10 m in diameter can be easily formed by current vertical excavation equipment. Vertical excavation equipment is considered to be most applicable if economic efficiency can be guaranteed compared with blasting method.

When the cave (c) is formed through excavation, a supplementary layer (40) can be formed (M20) by spraying a quick shotcrete on the inner wall of the cave (c) to prevent collapse of the inner wall. The supplement layer 40 may be temporarily installed after the excavation is completed, but may be divided and installed in the excavation process. However, the complementary layer 40 may be omitted if the rock is rigid.

When the cavern (c) excavation is completed, the pedestal (20) is installed in advance in the lower part of the cavern (c). When the installation of the pedestal 20 is completed, the tank main body 10 is to be installed. As a preliminary work, a charging step M30 for charging the cavan c with the first fluid is performed. The first fluid may be water to provide buoyancy. As the first fluid, various fluids that can provide buoyancy in addition to water can be used. In the case of excavation by the blasting method, the first fluid must be separately charged. However, in the case of using the above vertical excavation equipment, the cavern (c) is already filled with water injected at the time of excavation.

When the filling of the first fluid is completed, a tank manufacturing step (M50) is performed. The tank manufacturing step M50 is an important process for manufacturing the tank main body 10 ranging from 100 to 200 m in height and installing it in the caban c.

In the tank manufacturing step M50, a plurality of segments to be formed in the tank body 10 are manufactured by mutually welding in the caban c.

When the connecting members 71 and 72 are prepared in the segments 11,12 and 13, the lower segment 11 is transferred by using the crane a to the first fluid f1 filled in the cavern c I will do it. The main body of the crane (a) is installed on the ground, and the pull string b of the crane is introduced into the first horizontal tunnel 200 through the connection hole 300.

The way in which the crane (a) supports the segments (11, 12, 13) can be variously adopted. For example, an electromagnet may be attached to the crane pull string (b) A combination method may be adopted.

When the lower segment 11 is disengaged and disconnected from the crane a, the upper end of the lower segment 11 floats above the first fluid f1 by buoyancy. When the upper end of the lower segment 11 is floated higher than the work position for welding with the body segment 12, the first fluid f1 is partially discharged and supplied into the lower segment 11, It adjusts. When the height of the lower segment 11 is adjusted, the first support unit M1 installed in the first horizontal tunnel 200 fixes the center, the posture and the angle so that the lower segment 11 is not deflected. Since the lower segment 11 floats by buoyancy, the first support unit M1 only serves to fix the center of the lower segment 11 on the plane.

After the position of the lower segment 11 is fixed, the torso segments 12 are stacked on the lower segment 11 and are joined together. In this embodiment, the segments are joined by welding in consideration of airtightness and stability. As described above, the welding quality between the segments is the most important point in the airtightness of the entire tank body 10. More specifically, the crane (a) is hung from the first body segment 12 and is positioned at a predetermined distance from the lower segment 11. Since the spacer s is attached to the upper end of the lower segment 11, the body segment 12 is disposed in contact with the spacer s. The second support unit M2 installed in the first horizontal tunnel fixes the position of the body segment 12 suspended from the crane a such that it is not horizontally biased horizontally. Since the trunk segment 12 is supported by the crane a, the second support unit M2 serves to hold the center of the trunk segment 12. The center points of the body segment 12 and the bottom segment 11 are aligned with each other and the top surface of the bottom segment 11 and the bottom surface of the trunk segment 12 are slightly spaced apart And will be arranged in parallel.

When the positioning of the two segments to be mutually coupled is completed, the spacer (s) attached to the upper end of the lower segment 11 is peeled off. Since the welded overhang members 15 are attached between the segments, the welded space is exposed in a closed state behind the welded portion. After the welding is completed, it is preferable to confirm the welding quality through inspection.

As described above, when the coupling between the lower segment 11 and the first trunk segment 12 is completed, the plurality of trunk segments 12 are sequentially stacked and joined by the same method. The manufactured part which has already been combined is supported by buoyancy as described above and is fixed in position by the first support unit M1 and the newly joined segment is suspended from the crane a to form the second support unit M2, As shown in Fig.

The upper end of the manufactured part is always placed at a constant height by the lifting force, and the welding work is performed. In order to adjust the upper end of the manufactured part to the position where the welding operation is performed, the lifting force must be adjusted. As a method for adjusting the float force, there is a method of slowly discharging the first fluid f1 in the cave (c). As the water level is lowered, the previously manufactured parts are also inserted into the cabon (c), so that the working position can be kept constant. In addition, by supplying the second fluid f2 to the inside of the previously manufactured portion, the previously manufactured portion can be lowered by increasing the weight. In this embodiment, the first fluid f1 in the cabon c is pumped and supplied to the prefabricated portion while the segments are combined, thereby adjusting the position by lowering the prefabricated portion. That is, the first fluid f1 is discharged and reused as the second fluid f2.

When the lower segment 11, the torso segment 12 and the upper segment 13 are all welded in the above-described manner, the tank body 10 is completed.

The tank main body 10 is floated by the buoyant force in a state where the tank main body 10 is fully inserted into the cavern c in the state of being manufactured as described above. The tank body 10 is now seated on the pedestal 20. When the first fluid f remaining in the cavan c is gradually discharged and supplied to the tank main body 10 in the same manner as the above processes, the tank main body 10 descends and the weight of the main tank body 10 The tank body 10 is mounted on the seat portion 22 of the pedestal 20 at a moment when the buoyancy becomes larger than the buoyancy force. The first support unit M1 assists the center of gravity to be vertically disposed without being shaken when the tank main body 10 is lowered and seated in the pedestal 20. When the tank body 10 is seated and supported on the pedestal 20, the installation work of the tank body 10 is completed.

Meanwhile, in the process of manufacturing and installing the tank main body 10 as described above, the first support unit M1 and the second support unit M2 each have a function of fixing the position of the segment to be newly engaged with the previously- Various devices may be used for the first supporting unit M1 and the second supporting unit M2. Although not shown, a plurality of cylinders are provided at intervals of a predetermined angle along the outer peripheral surface of a segment to be newly joined or a manufactured portion, and a piston provided on the cylinder can independently push the segment so that the segment to be newly engaged is disposed at an accurate position . In addition, a plurality of hinge members are provided along the inner circumferential surface of the ring after the rings arranged to surround the segment or the manufactured portion, and the positions of the segmented and manufactured portions are fixed while fixing all of the hinge members in the radial direction . That is, in the course of fixing the hinge members in the radial direction of the ring, it is possible to push the deflected segments so that the segments are in place.

The first support unit M1 and the second support unit M2 are described above as an example, and the position of the pre-fabricated portion or the newly joined segment can be adjusted through various types of devices. Even if the first supporting unit M1 and the second supporting unit M2 are not used, the base member is supported by buoyancy, and the newly joined segment is supported by the crane, It will be possible to precisely control the position of the newly joined segment with the previously fabricated portion. Likewise, when the tank main body is mounted on the pedestal 20 after the manufacture of the tank main body is completed, the tank main body can be adjusted to be vertically disposed without biasing.

As described above, by supporting the pre-fabricated portion using buoyancy, the upper end of the pre-fabricated portion is floated to the welding position (generally above the first horizontal tunnel bottom) ≪ / RTI > In this way, the tank body with a height of over 100m can be manufactured directly on site and installed in the caban.

If the tank main body is installed in the cabin without using buoyancy, the crane hanging the manufactured portion and the crane hanging the segment to be newly joined are each required, which makes the manufacturing operation very difficult. Particularly, since the segment to be newly combined with the previously manufactured portion must be arranged coaxially, the use of two crane itself may not be possible. That is, in the present invention, it is significant in that practical use of CAES is enhanced by providing a method that can most economically perform manufacture and installation of a tank body of over 100 m.

On the other hand, a stiffener 30 is also installed in the process of installing the tank main body 10. That is, in the process of assembling the respective segments for manufacturing the tank main body 10, the segment pieces 33 provided in the respective segments are inserted into the connecting members 71 and 72, and the resin is filled. In the above process, the segment members 33 are connected to each other and the longitudinal reinforcing member 32 is integrally formed at the time when the tank main body 10 is manufactured. Since the transverse reinforcement member 31 is coupled to the longitudinal reinforcement member 32, the reinforcing member 30 is formed in a mesh shape as a whole to enclose the tank body 10. [

Further, since the separation membrane 60, the waterproof membrane 81, the rustproof membrane 82 and the heat insulating membrane 83 are also formed in the process of laminating the segments as described above, a very economical construction is possible.

 We now perform the backfill step (M70) as the last step. In other words, the back fill layer is formed by filling the back fill material between the tank body 10 and the rock mass g. The backfill can be divided or laid at any time. In this embodiment, the grout material is sprayed under high pressure to perform backfill.

It should be noted that when charging the backfill material, the third fluid (f3) must be filled in the tank body (10) first. When the backfill material is charged, the tank body 10 has two functions. One is that buoyancy is applied to the tank body 10 as the backfill material is charged, and the other is the tank body 10 is pressed by the weight of the backfill material. Therefore, it is preferable to fill the third fluid f3 to prevent the tank body 10 from being damaged by the pressure of the backfill material before filling the backfill material.

As the third fluid (f3), water or compressed air can be used.

The water level of the water filled in the tank main body 10 is formed to be slightly higher than the height at which the backfill material is to be installed. That is, when dividing the backfill, water may be filled at a level slightly higher than the height of the backfill material charged at the time of each division. When the backfill is performed at a time, the inside of the tank body 10 may be filled with water. When water is used as the third fluid, both the pressure and the buoyancy are advantageous. However, there is a problem that the weight of the tank main body 10 becomes too large by filling the tank main body 10 with water. In this embodiment, the pedestal 20 is installed in advance. If the pedestal does not support the tank body 10, the crane (a) must support all the weight of the tank body 10 and hang up. If the tank body 5 m in diameter and 100 m in height is filled with water, The output of the crane may be a problem. In the present invention, since the pedestal 20 is previously installed to support the tank body 10, this technical problem can be solved.

A method of using compressed air as the third fluid f3 can be considered since the self weight of the tank body 10 is a problem when water is used. This is because when the pressure is applied by the compressed air, it is possible to cope with the pressure of the backfill material. However, if compressed air is used as the third fluid (f3), there is a problem that it can not cope with buoyancy of the backfill material. Even if air is compressed, its weight is very small.

In this embodiment, since the pedestal 20 is installed in advance, a method of using only water as the third fluid may be employed, but more preferably, a method of using water and compressed air is adopted. That is, after partially filling the tank main body 10 with water, the air is compressed to a high pressure and injected into the tank main body 10, so that buoyancy and pressure of the backfill material can be coped with.

The backfill material is cured after a certain period of time.

Meanwhile, the first plugs 90 may be formed together in the backfill step or separately from the backfill step. That is, when the first horizontal tunnel 200 on the upper part of the cabin is closed by using a formwork or the like, the backfill layer and the first plug can be integrally formed together by injecting the backfill material into the cavern interior and the first horizontal tunnel. Alternatively, after forming the back fill layer, the first horizontal tunnel 200 may be closed and the first plug may be separately formed using a filler such as concrete.

Meanwhile, the storage tank 100 employed in the present invention may be connected to a ground power generation system. The CAES power generation system may be a turbine power generation system or a cylinder-motor power generation system. In the turbine power generation system, a plurality of compressors, a heat exchanger, an inflator and a turbine are provided to compress air in multiple stages in a compressor, store it in a high-pressure fluid storage tank 100, and supply compressed air to the turbine . In the cylinder-motor system, an engine shaft connected to a motor is driven to drive a plurality of cylinders to compress air and store the compressed air in a high-pressure fluid storage tank 100. The compressed air is then supplied to the cylinder again, to be. In addition, the high-pressure fluid storage tank may be used to improve power generation efficiency by being connected to a combined thermal power generation system that combines a turbine system and thermal power.

As described above, according to the present invention, it is possible to increase the utilization of CAES by providing a practical technique for installing a high-pressure fluid reservoir having a diameter of several meters or more and a height of several tens of meters or more in the deep part of the underground, . Furthermore, the present invention is expected to promote the commercialization of CAES as a part of future energy policy by suggesting a method for constructing a high-pressure fluid reservoir economically.

Meanwhile, the first embodiment described above is a structure in which a ground is excavated downward from the first horizontal tunnel to form a cavan, whereas the second embodiment described below

Meanwhile, in the first embodiment described above, the structure in which the cave is formed by forming the first horizontal tunnel and then excavating the ground below the first horizontal tunnel using the excavation equipment has been described and shown, A slightly different structure is disclosed in the second embodiment of the present invention shown in Fig.

14 and 15, in the second embodiment, a second horizontal tunnel 91 is formed in the lateral direction separately from the first horizontal tunnel, and the second horizontal tunnel 210 is formed in the second horizontal tunnel, Lt; RTI ID = 0.0 > 1 < / RTI > depth. In order to form the second horizontal tunnel 210, the access tunnel e must be formed up to the second depth.

In the first embodiment, the ground is excavated downward from the first horizontal tunnel 200, but in the second embodiment, the ground is excavated upward from the second horizontal tunnel 210, Lt; / RTI > In this case, the excavation equipment can be used, but it is effective to employ the blasting method. The arm burr due to the blasting falls to the second horizontal tunnel 210 due to gravity, so that the arm burr can be discharged through the access tunnel e. The second horizontal tunnel 210 is preferably formed in a shape corresponding to the first horizontal tunnel 200. For example, the main tunnel and the auxiliary tunnel can be formed like the first horizontal tunnel.

As described above, after the cavern is excavated upward from the second horizontal tunnel 210, the second horizontal tunnel 210 is closed by a mold or the like, and then concrete or the like is laid to close the lower portion of the cabin. (91). Since the lower portion of the cabin is closed by the second plug 91, the cabin is structurally the same as the cabon is excavated downward from the first horizontal tunnel in the first embodiment. Therefore, since the fluid reservoir 100 can be constructed from the first horizontal tunnel 200 in the same manner as in the first embodiment described above, detailed description thereof will be omitted.

The second embodiment differs from the first embodiment in that the cave is finally excavated. In the first embodiment, the cave is excavated downward from the first horizontal tunnel. In the second embodiment, there is a difference in that the cave is excavated upward from the second horizontal tunnel 210 to the first horizontal tunnel 200, There is a difference in that a second plug 91 is provided to close the lower end of the cabin. Depending on the conditions of the rock and excavation equipment, it may be difficult to excavate the ground from above to below as in the first embodiment. Also, if the use of excavation equipment is technically and economically advantageous, it is to excavate the ground through blasting from bottom to top. However, in the case of the upward excavation method, since the lower portion of the cavern is pierced, the fluid for providing buoyancy can not be filled in the cavern, so that the second plug 91 is installed to close the lower portion of the cavern. Also, even if the fluid reservoir 100 is installed by another method without adopting the method using buoyancy, since the lower part of the reservoir can be closed only to perform a fundamental function as a fluid reservoir, 2 Close the lower part of the cabin with the plug.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

500,510 ... fluid storage system 100 ... high pressure fluid reservoir
200 ... first horizontal tunnel, 210 ... second horizontal tunnel 300 ... connection hole
10 ... tank body 11 ... lower segment 12 ... trunk segment
13 ... upper segment 15 ... welded overlap member 20 ... pedestal
30 ... stiffener 31 ... lateral reinforcing member 32 ... longitudinal reinforcing member
33 ... segment piece 40 ... complementary layer 50 ... back fill layer
60 ... separation membrane 70, 71, 72 ... connection member 73 ... mounting portion
74,75 ... insertion hole 76 ... injection hole 81 ... waterproof membrane
82 ... rustproof film 83 ... heat insulating film 90,91 ... 1st and 2nd plugs
M1 ... first support unit M2 ... second support unit e ... access tunnel
f1 ... first fluid f2 .. second fluid f3 ... third fluid
c ... cavan p ... pipe r ... resin
s ... spacer w ... welding part g ... ground

Claims (18)

A first horizontal tunnel formed laterally at a first depth of the basement;
A cave formed by digging the ground below the first horizontal tunnel; And
A backing layer formed by a backfill material filled between the tank body and the inner wall of the cabin, and a backfill material filling the first horizontal tunnel to close the upper part of the cabin, And a fluid reservoir having a first plug formed therein. A first horizontal tunnel formed laterally at a first depth of the basement;
A second horizontal tunnel formed laterally at a second depth below the first depth;
A cave formed by digging a ground between the first horizontal tunnel and the second horizontal tunnel; And
A backing layer formed by a backfill material filled between the tank body and the inner wall of the cabin, and a backfill material filling the first horizontal tunnel to close the upper part of the cabin, And a fluid reservoir having a first plug formed therein and a second plug formed by filling backfill material in the second horizontal tunnel to close the lower portion of the cabin. 3. The method according to claim 1 or 2,
Wherein the plurality of fluid reservoirs are provided so as to be spaced apart from each other along the first horizontal tunnel. 3. The method according to claim 1 or 2,
Wherein the first horizontal tunnel includes a main tunnel and at least one auxiliary tunnel which is formed in a lateral direction branched from the main tunnel,
And a plurality of the caban are formed to be spaced apart from each other below the main tunnel or the auxiliary tunnel. 3. The method according to claim 1 or 2,
Further comprising: a connection hole formed through the ground from the surface to the first horizontal tunnel. The method according to claim 1 or 2, wherein
Wherein the back fill layer and the first plug are integrally formed by a backfill material. 3. The method according to claim 1 or 2,
Wherein the tank body is made of a hermetically sealed material, and a receiving part for storing a high-pressure fluid is formed in the tank body, and a plurality of segments are sequentially laminated and bonded along the longitudinal direction. 3. The method according to claim 1 or 2,
Further comprising: a reinforcing member disposed to surround the tank body in a state of being spaced apart from the tank body, the backing layer containing the reinforcing member. 9. The method of claim 8,
Further comprising a plurality of connecting members disposed along the outer circumferential surface of the tank body and spaced from each other along the longitudinal direction of the tank body,
And the stiffener is installed on the connecting member. 10. The method of claim 9,
The reinforcing member includes a plurality of transverse reinforcing members disposed to be spaced apart from each other along the longitudinal direction of the tank body and a plurality of longitudinal reinforcing members connected to the transverse reinforcing member and spaced from each other so as to intersect with the transverse reinforcing member In addition,
Wherein the longitudinal reinforcing member is formed by sequentially connecting a plurality of intercepting members along the longitudinal direction, and the intercepting member is installed on the connecting member. 10. The method of claim 9,
The reinforcing member includes a plurality of transverse reinforcing members disposed to be spaced apart from each other along the longitudinal direction of the tank body and a plurality of longitudinal reinforcing members connected to the transverse reinforcing member and spaced from each other so as to intersect with the transverse reinforcing member In addition,
Wherein the connecting member is disposed along the circumferential direction of the tank body and is coupled to the outer circumferential surface of the tank body or spaced apart from the outer circumferential surface of the tank body so that the mounting portion into which the longitudinal reinforcing member is inserted is formed. 12. The method of claim 11,
Wherein at least one of the plurality of connecting members is coupled to the tank body. 8. The method of claim 7,
Further comprising a weld overlapping member attached to an inner or outer surface of the segment so as to protrude from an upper end surface or a lower end surface of the segment. 3. The method according to claim 1 or 2,
A rust preventive film formed on at least one of an inner circumferential surface and an outer circumferential surface of the tank main body to prevent corrosion of the tank main body, a separator formed on the outer surface of the tank main body so that the tank main body and the backfill material are not coupled to each other, A waterproof membrane formed on an outer circumferential surface of the tank body so as to prevent the body from contacting the surrounding water and a waterproof membrane formed on at least one of an inner circumferential surface and an outer circumferential surface of the tank body so as to prevent heat- And a heat insulating film formed on the heat insulating film. 3. The method according to claim 1 or 2,
The tank body is made of a metal material,
Further comprising a corrosion inhibitor of a metallic material electrically connected to the tank body to delay corrosion of the tank body by a galvanic effect. 3. The method according to claim 1 or 2,
A support portion provided on a bottom surface of the cabin and a seating portion formed on the support portion and on which the tank main body is seated to hold the tank main body in a state of being spaced upward from the bottom surface of the cabin, Pressure fluid storage system. 17. The method of claim 16,
And the backfill material is filled in the inside of the pedestal support portion,
Wherein the support is comprised of a plurality of plates having a lattice or a plurality of inflow holes. A high-pressure fluid storage system formed in the deep part of the underground,
A CAES system including a power generation system that compresses air to a high pressure in the high-pressure fluid storage system and generates power using the compressed air,
Wherein the high-pressure fluid storage system is the high-pressure fluid storage system according to any one of the preceding claims.

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