KR101302216B1 - Liquefied gas storage tank and ship having the same - Google Patents

Abstract

A liquefied gas storage tank, a vessel having the same, and a construction method thereof are provided. The liquefied gas storage tank according to the present embodiment includes a plurality of sandwich barriers having a sandwich panel structure in which a pair of plates are spaced apart from each other; And a single barrier structure having a single panel structure, wherein a single barrier is disposed between the plurality of sandwich barriers such that both ends thereof are respectively coupled to ends of the plurality of sandwich barriers. Welded to form the appearance of the liquefied gas storage tank.

Description

Liquefied gas storage tank and vessel equipped with it {LIQUEFIED GAS STORAGE TANK AND SHIP HAVING THE SAME}

The present invention relates to a liquefied gas storage tank and a vessel provided with the same.

Liquefied gas carriers are used to transport liquefied gases, such as liquefied natural gas (Liquefied Natural Gas) or liquefied petroleum gas (LPG), to consumers.

The liquefied gas carrier has a storage tank for storing liquid cargo, and the storage tank is generally divided into an independent tank type and a membrane type. Here, the independent tank type is a method in which the storage tank is not formed integrally with the hull and the independent storage tank is supported by the hull supporting device, and according to the installation number and the use pressure of the barrier preventing the leakage of liquefied gas, Type A, B , Separated by C.

Specifically, Type A corresponds to AKER's Aluminum Double Barrier Tank (ADBT), in which both primary and secondary barriers are installed. Type B is a structure that prepares for leakage of the primary barrier by installing a primary barrier and installing a drip tray. The tank has a spherical moss type and a prismatic type IHI. There is SPB (Self-supporting, Prismatic-shape IMO type B). In addition, Type C is equipped with a primary barrier as a pressure vessel.

1 is a cross-sectional view showing a Type A structure of an independent tank type.

The storage tank having the type A structure of the independent tank type is a structure that can safely prevent the leakage of liquefied gas by installing the primary barrier (1) and the secondary barrier (2) in the whole area, the primary barrier (1) and Both secondary barriers (2) contribute to the rigidity of supporting the load of the storage tank and has the advantage that can be efficiently produced through extrusion molding. At this time, the primary barrier 1 and the secondary barrier 2 are generally formed integrally in a sandwich structure.

A storage tank having such a sandwich structure is disposed between the primary barrier 1 and the secondary barrier 2, and both ends thereof are welded between the primary barrier 1 and the secondary barrier 2, respectively, so that the rigidity of the storage tank is achieved. It is provided with a connecting plate (3) to complement. However, the connecting plate 3 is formed between the primary barrier 1 and the secondary barrier 2 as shown in FIG. After arranging them to face each other, it is difficult to weld the ends of the connecting plates 3 opposite to each other when the ends are welded together.

In addition, the storage tank having a conventional Type A structure is designed to be watertight so that the primary barrier (1) and the secondary barrier (2) is completely waterproof, as shown in Figure 1 and the primary barrier (1) and Liquefied gas cannot be stored in the space between the secondary barriers 2. That is, the storage tank made of a sandwich structure has a disadvantage in that the storage capacity of the liquefied gas is reduced by forming a sealed double wall structure in which the interior maintains an empty space.

The conventional independent liquefied gas storage tank has a storage capacity of the storage tank is lowered, there is a disadvantage that the hull itself of the storage tank and the carrier to mount the same to load the liquefied gas of the same capacity.

Embodiments of the present invention is to provide a liquefied gas storage tank and a vessel having the same sandwiching the unit sandwich panel of the sandwich structure mutually and then easily join the ends of the connecting plate when welding the ends thereof To provide.

According to an aspect of the invention, a plurality of sandwich barrier having a sandwich panel structure in which a pair of plates are spaced apart from each other; And a single barrier structure having a single panel structure, wherein a single barrier is disposed between the plurality of sandwich barriers such that both ends thereof are respectively coupled to ends of the plurality of sandwich barriers. There is provided a liquefied gas storage tank characterized in that the welded to form the appearance of the liquefied gas storage tank.

The sandwich barrier may include a plurality of connecting plates disposed parallel to each other between the pair of plates, and both ends of which are coupled to the pair of plates, respectively.

One or more first through holes may be formed in a plate adjacent to the inside of the liquefied gas storage tank among the pair of plates, in which case liquefied gas in the liquefied gas storage tank may flow through the first through hole. have.

One or more second through holes may be formed in the plurality of connection plates.

The single barrier may include a plurality of ribs arranged side by side on the inner side of the single barrier so that both ends are coupled to the ends of the plurality of connecting plates arranged side by side.

The sandwich barrier and the single barrier can each be fabricated by extrusion molding, by joining individual plates together by welding, or fabricated by pull molding.

The liquefied gas storage tank may further include a web installed on an inner side surface of the single barrier to intersect the plurality of ribs.

The web may be formed with a slot inserted into the plurality of ribs.

A flange may be formed on an upper portion of the rib, and a coupling hole extending in a direction orthogonal to the slot may be formed in the web to correspond to the flange.

A flange may be formed on an upper portion of the rib, and an insertion groove may be formed in the flange in a direction orthogonal to the rib to allow the web to be inserted therethrough.

The web may include a reinforcement part extending in the width direction of the rib.

The web may be welded to the inner side of the plurality of ribs and the single barrier, respectively.

A flange may be formed on an upper portion of the rib, and the web may be welded to the flanges of the plurality of ribs.

The web may be installed at the point where the sandwich barrier and the single barrier meet.

A through hole may be formed in each of the web and the rib.

The liquefied gas storage tank may further include a support disposed between an inner surface of the hull and an outer surface of the liquefied gas storage tank.

The liquefied gas storage tank may further include a heat insulation layer constructed by attaching a heat insulation panel to an outer surface of the liquefied gas storage tank.

The liquefied gas storage tank may further include a drip tray installed under the liquefied gas storage tank.

According to another aspect of the present invention, there is provided a hull comprising: a hull; There is provided a vessel including a liquefied gas storage tank according to an aspect of the present invention installed in the hull.

According to embodiments of the present invention, the unit sandwich panels having a sandwich structure can be arranged to face each other, and then the ends thereof can be more easily and securely joined to each other when welding the ends thereof, thereby liquefying. The rigidity supporting the load of the gas storage tank and the liquid cargo contained therein can be increased.

In addition, the storage capacity of the liquefied gas storage tank can be increased by accommodating a liquid cargo such as liquefied gas even in the double barrier structure, so that the storage tank itself can be made large or mounted to increase the storage capacity of the existing storage tank. There is no need to make the ship itself large.

1 is a cross-sectional view showing a Type A structure of an independent tank type.
2 is a cross-sectional view showing a vessel having a liquefied gas storage tank according to an embodiment of the present invention.
3 is a perspective view showing a sandwich barrier of the liquefied gas storage tank according to an embodiment of the present invention.
Figure 4 is a perspective view showing a single barrier of the liquefied gas storage tank according to an embodiment of the present invention.
5 and 6 are perspective views showing a coupling relationship between the sandwich barrier and the single barrier constituting the liquefied gas storage tank according to an embodiment of the present invention.
7 to 9 are perspective views showing the relationship of coupling the web to a single barrier of the liquefied gas storage tank according to an embodiment of the present invention.
10 is a flow chart showing a liquefied gas storage tank construction method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same or corresponding reference numerals and duplicate description thereof. Will be omitted.

2 is a perspective view schematically showing a cross section of a vessel having a liquefied gas storage tank according to an embodiment of the present invention, Figure 3 is a perspective view showing a sandwich barrier of the liquefied gas storage tank according to an embodiment of the present invention. 4 is a perspective view showing a single barrier of a liquefied gas storage tank according to an embodiment of the present invention.

2 to 4, the ship 1000 having the liquefied gas storage tank according to the present embodiment is a ship having a liquefied gas storage tank 100 extending in the longitudinal direction of the hull 10. The hull 10, a plurality of sandwich barriers 110 installed on the inner surface of the hull 10, and a single barrier 120 disposed between the plurality of sandwich barriers 110 may be included.

The vessel in the present invention may include a floating offshore structure having a liquefied gas storage tank, such as LNG-FPSO (Floating Production Storage Offloading) as well as a conventional vessel that can be propelled with self-defense capability.

Hull 10 may be composed of a double hull (outer hull) and inner hull (inner hull), the liquefied gas storage tank for storing the liquefied gas in the inner plate of the hull 10 ) Will be located.

2 to 4, the liquefied gas storage tank 100 according to the present embodiment is an independent type storage tank includes a sandwich barrier 110 and a single barrier 120, the hull 10 It may be dried together, or may be manufactured separately from the hull 10 and mounted in the hull 10.

According to this embodiment, by placing a single barrier 120 between the plurality of sandwich barrier 110 forming the outer shape of the liquefied gas storage tank 100, these sandwich barrier 110 and the single barrier 120 is hulled. (10) When installed therein, the mutually opposite ends of the sandwich barrier 110 and the single barrier 120 can be welded more easily and reliably, and thus are accommodated in the liquefied gas storage tank 100 and the interior thereof. The rigidity which supports the load of liquid cargo can be raised.

In addition, by storing the liquefied gas in the liquefied gas storage tank 100 in the internal space 130 formed between the pair of plates 112 and 114 forming the sandwich barrier 110, the storage of the liquefied gas storage tank 100 The capacity can be increased, and accordingly, there is no need to make a large storage tank itself or a large vessel itself to increase the storage capacity of the existing storage tank.

Hereinafter, each configuration of the liquefied gas storage tank 100 according to the present embodiment will be described in more detail.

As shown in FIG. 3, the sandwich barrier 110 is a unit panel having a constant size having a sandwich panel structure in which a pair of plates 112 and 114 are spaced apart from each other, and the outer shape of the liquefied gas storage tank 100. The plurality of sandwich barriers 110 may be disposed to face each other so as to form the same.

In detail, the sandwich barrier 110 may include a plurality of connecting plates 116 disposed side by side between the pair of plates 112 and 114.

The connecting plate 116 is disposed vertically between the pair of plates 112 and 114 so as to be coupled to the pair of plates 112 and 114, and both ends thereof are respectively connected to the pair of plates 112 and 114. Can be combined.

The sandwich barrier 110 may be integrally manufactured through a process such as extrusion without additional connection work such as welding.

The sandwich barrier 110 may be manufactured by connecting individual plates with each other by welding or by drawing, in addition to extrusion molding.

For reference, the single barrier 120 to be described later may also be manufactured in the same manner as the sandwich barrier 110. As such, the plurality of sandwich barriers 110 and the plurality of single barriers 120 coupled to the ends thereof may be produced in large quantities in the same standard by a process such as extrusion molding, and the sandwich barrier 110 of the same standard and the single By connecting the barrier 120 to the inner surface of the hull 10 continuously, the large liquefied gas storage tank 100 can be manufactured more easily and efficiently.

The sandwich barrier 110 configured as described above has a plurality of sandwich barriers 110 along a direction orthogonal to the connecting plate 116 having both ends coupled between the pair of plates 112 and 114 as shown in FIG. 3. Can be arranged together. The plurality of sandwich barriers 110 arranged so as to face each other can join the contacted ends to each other in a welding-like manner.

5 and 6 are perspective views showing a coupling relationship between the sandwich barrier 110 and the single barrier 120 constituting the liquefied gas storage tank 100 according to an embodiment of the present invention.

As shown in FIGS. 4 to 6, the single barrier 120 is a unit panel of a predetermined size consisting of one plate 122, unlike the sandwich barrier 110, and both ends of the sandwich barrier 110 are respectively formed. It may be disposed between the plurality of sandwich barrier 110 to be coupled to the end.

The sandwich barrier 110 and the single barrier 120 which are disposed to face each other so as to face each other are welded to each other to form the outer shape of the liquefied gas storage tank 100.

The single barrier 120 is arranged side by side on the inner side of the single barrier 120 (ie, the side opposite to the inner space 102 of the liquefied gas storage tank 100) as shown in FIG. It may include a plurality of ribs 124. A flange 126 may be formed along the longitudinal direction of the rib 124, and the flange 126 serves to increase the rigidity of the single barrier 120.

The rib 124 is a configuration corresponding to the connecting plate 116 serving as a reinforcing material (that is, a structural material), and as shown in FIG. 5, a plurality of connections in which both ends thereof are arranged side by side on the sandwich barrier 110, respectively. It may be welded to the end of plate 116.

As such, by connecting and welding each connecting plate 116 of the plurality of sandwich barriers 110 and the ribs 124 of the plurality of single barriers 120 to each other, the connecting plate which has not been solved in the conventional storage tank construction method. End welding of 116 may be solved, and the connection between the sandwich barrier 110 and the single barrier 120 may be easily performed.

That is, as can be seen in Figure 5, by placing a single barrier 120 of the single panel structure with the top plate open between a pair of sandwich barrier 110 to be welded to each other, the portion that could not be welded in the conventional manner End welding coupling of the phosphorous connecting plate 116 and the rib 124 can be performed more easily, and even after the welding operation is completed, the inspector can easily approach and double check the welding state. In addition, it is possible to increase the stiffness of the liquefied gas storage tank 100 for supporting the liquid cargo without the need to install additional reinforcement.

Meanwhile, as shown in FIG. 5, the inner space 102 of the liquefied gas storage tank 100 (ie, the liquefied gas storage tank 100) of the pair of plates 112 and 114 constituting the sandwich barrier 110. One or more first through holes 118 may be formed in the upper plate 114 adjacent to the side facing the side).

The liquefied gas in the liquefied gas storage tank 100 passes freely into the internal space 130 in the sandwich barrier 110 through the first through hole 118 formed through the top plate 114 of the sandwich barrier 110. It may be or flow, and may be accommodated in the interior space 130 as well as the interior space 102 of the liquefied gas storage tank.

As such, the liquefied gas storage tank 100 according to the present embodiment has a larger inner space 130 than that of the conventional independent liquefied gas storage tank, and thus is relatively relatively without increasing the hull size of the vessel 1000. It can hold a lot of liquid cargo.

In addition, the connection plate 116 interposed between the sandwich barrier 110, at least one second through-flow so that the liquid cargo of the internal space 130 can flow from one side space to the other space with respect to the connection plate 116 The hole 119 may be formed.

These first through holes 118 and second through holes 119 may be formed in the upper plate 114 and the connecting plate 116 by a punching device (not shown), respectively.

Although an example in which the first through hole 118 and the second through hole 119 are circular in this embodiment is illustrated, the present invention is not limited thereto, and the first through hole 118 and the second through hole 118 are not limited thereto. The 119 may have various shapes, dimensions, and numbers, such as a rectangle and an ellipse, and may be formed in a row or have a predetermined arrangement or pattern.

In addition, although not shown, a rib through hole (not shown) similar to the second through hole 119 may be formed in the rib 124 of the single barrier 120.

By forming a rib through hole (not shown) in the rib 124 of the single barrier 120 as described above, the web 140, 140 ′ (see FIGS. 7 to 8) to be described later may be, for example, sandwiched with the barrier barrier 110. A problem arises in which a liquid cargo is trapped in a space formed by a pair of ribs 124 adjacent to each other and webs 140 and 140 'blocking both ends thereof, which are installed transversely at the point where the single barrier 120 meets. Even so, it may be moved to a neighboring space through a rib through hole (not shown) formed in the rib 124 of the single barrier 120.

In this case, although not shown, liquid cargo flows freely between the sandwich barrier 110 and the single barrier 120 through the webs 140, 140 ′ positioned between the sandwich barrier 110 and the single barrier 120. To this end, web through holes (not shown) may also be formed in the webs 140 and 140 '.

As described above, through-holes (not shown) are formed in the webs 140 and 140 'and the ribs 124 to allow liquid cargo to flow freely, thereby allowing liquid cargo, such as liquefied gas, to flow from the liquefied gas storage tank 100. When unloading, a liquid cargo transfer pump (not shown) can completely unload even a small amount of liquid cargo contained within the space blocked by the webs 140, 140 ′, ribs 124, and the like.

7 to 9 are perspective views showing a relationship of coupling the web (web, 140) to a single barrier 120 of the liquefied gas storage tank 100 according to the present embodiment.

As shown in Figures 7 to 9, the liquefied gas storage tank 100 according to the present embodiment is opposed to the inner surface (ie, the inner space 102 of the liquefied gas storage tank 100) of the single barrier 120 It may further include a web (web) is installed on the inner side of the single barrier 120 to intersect the plurality of ribs 124 arranged side by side at regular intervals.

Web 140 is the main member to support the load by dividing the longitudinal direction of the liquefied gas storage tank 100 into appropriate sections, As shown in FIG. 7, it may be disposed in a transverse direction orthogonal to the ribs 124 arranged in the longitudinal direction of the single barrier 120.

In addition, the web 140 may be continuously installed to cross the rib 124 of the single barrier 120. To this end, a plurality of slots 142 may be formed corresponding to each of the plurality of ribs 124 so that the web 140 may be inserted into the plurality of ribs 124.

Thus, the web 140 having a slot 142 corresponding to each rib 124 at its lower end is inserted into the rib 124 in a form that crosses the rib 124 of the single barrier 120. As a result, it may be installed on the inner side of the single barrier 120.

When the flange 126 is formed along the longitudinal direction of the rib 124 as in the present embodiment, the flange 126 as shown in FIG. 7 to fit the web 140 to the rib 124. A portion of) may be cut to correspond to the thickness of the web 140 to form the insertion groove 128.

That is, the lower end of the web 140 may be coupled to the rib 124 by passing through the insertion groove 128 of the flange 126.

After machining a part of the flange 126 in this way by inserting the slot 142 of the web 140 vertically through the cut-out portion of the flange 126, that is, the insertion groove 128, the web 140 is a single barrier It is easier and faster to install on 120.

As another example, as shown in FIG. 8, when the flange 126 is formed along the longitudinal direction of the rib 124, the web 140 ′ corresponds to the shape of the flange 126. Thus, the coupling hole 146 extending in the direction orthogonal to the slot 142 may be formed.

As such, the web 140 'includes a coupling hole 146 extending in a direction orthogonal to the slot 142, thereby assembling the web 140' to a plurality of single barriers 120 as shown in FIG. Slip into the rib 124 of the can be installed on the inner side of the single barrier 120. In this case, unlike the example described above, it is not necessary to machine the flange 126 of the single barrier 120.

At this time, the webs 140 and 140 'fitted to the plurality of ribs 124 of the single barrier 120 are welded to the inner surfaces of the plurality of ribs 124 and the single barrier 120, as shown in FIG. Can be combined.

In the present embodiment, as shown in FIG. 9, an example in which the webs 140 and 140 ′ are installed in the middle region of the single barrier 120 is illustrated. However, the present invention is not limited thereto, and the webs 140 and 140 ′ are not limited thereto. ) May be installed, for example, at the point where sandwich barrier 110 and single barrier 120 meet (see FIGS. 5 and 6).

In this case, as described above, liquid cargo can flow freely between the sandwich barrier 110 and the single barrier 120 through the webs 140, 140 ′ positioned between the sandwich barrier 110 and the single barrier 120. To this end, web through holes (not shown) may also be formed in the webs 140 and 140 '.

The webs 140, 140 ′ may further include a reinforcement 144 as shown in FIG. 7. The reinforcement part 144 is a portion formed by extending the upper portions of the webs 140 and 140 ′ and additionally supplements the rigidity of the web 140.

As such, the rigidity of the liquefied gas storage tank 100 may be improved by coupling the webs 140 and 140 'between the single barrier 120. That is, according to the present embodiment, it is possible to facilitate the installation of the webs 140 and 140 '.

Meanwhile, as shown in FIG. 2, the liquefied gas storage tank 100 according to the present embodiment further includes a support part 150 disposed between an inner side surface of the hull 10 and an outer side surface of the liquefied gas storage tank 100. It may include.

The support unit 150 serves to support the independent liquefied gas storage tank 100 on the inner side of the hull 10, one between the inner side of the hull 10 and the outer side of the liquefied gas storage tank 100. The above can be installed.

The liquefied gas storage tank 100 may further include a heat insulation layer 160 formed by attaching an insulation panel such as polyurethane foam to the outer surface of the liquefied gas storage tank 100 as shown in FIG. 2. Can be.

At this time, the gap between the liquefied gas storage tank 100 and the heat insulating panel may be disposed by placing the pads 162 at regular intervals in a plurality of positions. Such a gap may be used as a passage for moving the leaked liquefied gas leak liquid to a drip tray 170 to be described later when the liquefied gas storage tank 100 is damaged and the liquefied gas leaks.

As shown in FIG. 2, the liquefied gas storage tank 100 according to the present embodiment may further include a drip tray 170 installed under the liquefied gas storage tank 100.

For example, one or more drip trays 170 may be installed at a lower edge portion of the liquefied gas storage tank 100, and when the liquefied gas leak occurs, the drip tray 170 accommodates and stores the leaked liquid.

Thus, according to this embodiment, by placing a single barrier 120 between the plurality of sandwich barriers 110 forming the appearance of the liquefied gas storage tank 100, these sandwich barriers 110 and a single barrier (120). When the inside of the hull 10 is installed inside the sandwich barrier 110 and the single barrier 120, the mutually opposite ends can be welded more easily and reliably, thereby liquefied gas storage tank 100 and the inside It can increase the rigidity to support the load of the liquid cargo accommodated, can shorten the time taken to construct the liquefied gas storage tank 100, and as a result can reduce the manufacturing cost.

In addition, by storing the liquefied gas in the liquefied gas storage tank 100 in the internal space 130 formed between the pair of plates 112 and 114 forming the sandwich barrier 110, the storage of the liquefied gas storage tank 100 The capacity can be increased, and accordingly, there is no need to make a large storage tank itself or a large vessel itself to increase the storage capacity of the existing storage tank.

In the above description about the vessel 1000 having a liquefied gas storage tank according to an aspect of the present invention, hereinafter liquefied gas storage tank according to another aspect of the present invention for constructing the liquefied gas storage tank 100 The construction method will be described.

10 is a flowchart schematically showing a liquefied gas storage tank construction method according to an embodiment of the present invention.

Referring to FIG. 10, the method for constructing a liquefied gas storage tank according to the present embodiment may include: providing a plurality of sandwich barriers 110 and a single barrier 120 (S110); Disposing a single barrier (120) between the plurality of sandwich barriers (110) so that both ends are coupled to ends of the plurality of sandwich barriers (110) (S120); It may include a step (S130) of mutually welding the end of the sandwich barrier 110 and the end of the single barrier 120 adjacent to each other.

In the case of the present embodiment, the configuration and operation of the liquefied gas storage tank 100 is the same as or corresponding to the above-described embodiment, so duplicate description thereof will be omitted.

First, in the method of constructing the liquefied gas storage tank 100 in the hull 10 by using the liquefied gas storage tank 100 described above, a plurality of sandwich barriers 110 and a single barrier 120 to provide. It may be (S110).

That is, the sandwich barrier 110 and the single barrier 120 in a size and shape determined according to the design conditions can be produced in a unit panel to provide a construction site. In this case, the unit panels 110 and 120 may be mass-produced integrally by a method such as compression molding without additional work such as welding as described above.

As such, by manufacturing the sandwich barrier 110 and the single barrier 120 by extrusion molding or drawing, the production time can be greatly reduced, and the construction time can be shortened by greatly reducing the welding work and the welding area. .

In this case, the method for constructing a liquefied gas storage tank according to the present embodiment includes a plate 114 adjacent to the inside of the liquefied gas storage tank 100 among the pair of plates 112 and 114 constituting the sandwich barrier 110. The method may further include a step S150 of drilling one or more first through holes 118.

The step S150 of drilling the first through hole 118 may be performed before the step S110 of providing the plurality of sandwich barriers 110 and the single barrier 120, and the plurality of sandwich barriers 110. After the step S110 of providing the single barrier 120 and the sandwich barrier 110 and the single barrier 120 may be performed adjacent to each other to form the liquefied gas storage tank 100.

In detail, when the first through hole 118 is drilled before providing the plurality of sandwich barriers 110 and the single barrier 120 (S110), the sandwich barrier 110 and the single barrier 120 may be formed. In the same way as compression molding, drilling can be carried out together in mass production at the factory.

In addition, in the case where the first through hole 118 is drilled after the step S110 of providing the plurality of sandwich barriers 110 and the single barrier 120, the upper plate of the sandwich barrier 110 welded to face each other. Perforation can be performed using a perforation device or other automated device (not shown) at 114.

In addition, the method for constructing a liquefied gas storage tank according to the present embodiment may further include drilling one or more second through holes 119 in the plurality of connecting plates 116 (S160).

In the present embodiment, the step S160 of drilling the second through hole 119 may be performed before the step S110 of providing a plurality of sandwich barriers 110 and a single barrier 120. That is, when the sandwich barrier 110 and the single barrier 120 is mass-produced in the factory in the same manner as the compression molding, the drilling operation of the second through hole 119 may also be performed.

The sandwich barrier 110 thus manufactured may be installed on the inner surface of the hull 10.

That is, as described in the above embodiment, in the sandwich barrier 110, a plurality of sandwich barriers 110 may be arranged along each other along the direction orthogonal to the longitudinal direction of the connecting plate 116 (ie, the transverse direction). have. The plurality of sandwich barriers 110 arranged so as to face each other may couple the contacted ends to each other in a manner such as friction stir welding, for example.

Thus, a single barrier 120 may be disposed between the plurality of sandwich barriers 110 so that the ends of the single barrier 120 are coupled to the ends of the sandwich barrier 110 arranged side by side on the inner side of the hull 10 ( S120).

In this case, as can be seen in Figure 5, by placing the single barrier wall 120 of the single panel structure with the top plate open between the pair of sandwich barriers 110 to be welded to each other, it was not possible to weld in the conventional manner End welding of the connecting plate 116 and the rib 124 as a part can be performed more easily.

For reference, as described above with reference to Figure 1, the storage tank of the sandwich structure according to the prior art is the upper plate and the lower plate and the pair forming the primary barrier (1) and the secondary barrier (2) It has a structure of connecting plate (3) is welded between the plates of the sandwich structure, the storage tank of this sandwich structure unit sandwich panels (not shown) constituting the primary barrier (1) and the secondary barrier (2) Arranged oppositely and then welded to each of its ends. At this time, according to the prior art, the connection between the unit sandwich panels facing each other between the primary barrier (1) and the secondary barrier (2) when there is no space that can be accessed by the operator Only the ends of the primary barrier 1 and the secondary barrier 2, which are exposed to the outside of the furnace, are welded to each other, and the connecting plate 3 interposed therebetween keeps the ends facing each other without surface welding.

In order to solve this problem, the liquefied gas storage tank 100 according to the present embodiment is disposed between a pair of sandwich barriers 110 to be welded to each other by welding a single barrier 120 having a single panel structure having an open top plate. End welding of the connecting plate 116 and the rib 124, which is a portion that could not be welded in the related art, can be performed more easily, and the inspector can easily approach the double check of the welding state even after the welding operation is completed. have.

Next, the ends of the sandwich barrier 110 and the end of the single barrier 120 adjacent to each other may be welded to each other (S130).

As shown in FIG. 6, conventional storage as mentioned above by joining and welding each connecting plate 116 of the plurality of sandwich barriers 110 and each rib 124 of the plurality of single barriers 120 to one another. End welding of the connecting plates 116 that could not be solved in the tank construction method can be solved, and the connection between the sandwich barrier 110 and the single barrier 120 can be easily performed.

In addition, the liquefied gas storage tank construction method according to the present embodiment, further comprising the step (S170) of installing the web (140, 140 ') on the inner surface of the single barrier 120 to cross the plurality of ribs (124). can do.

Specifically, the step (S170) of installing the web (140, 140 '), the step (S171) of fitting the web (140, 140') to the plurality of ribs 124, and the plurality of web (140, 140 ') It may include the step (S172) of welding to the inner surface of the rib 124 and the single barrier 120 of.

In this case, the webs 140, 140 ′ may be disposed in a transverse direction orthogonal to the ribs 124 arranged in the longitudinal direction of the single barrier 120 as described above in FIGS. 7-9. To this end, a plurality of slots 142 may be formed in the webs 140 and 140 'corresponding to each of the plurality of ribs 124 to be inserted into the plurality of ribs 124.

Thus, the webs 140 and 140 'having the slots 142 corresponding to the ribs 124 at the lower ends thereof are fitted to the ribs 124 in the form of crossing the ribs 124 of the single barrier 120. By inserting in a custom, it can be installed on the inner side of the single barrier (120).

Specifically, when the flange 126 is formed along the longitudinal direction of the rib 124 as shown in the present embodiment, as shown in Figure 7 to fit the web 140 to the rib 124 A portion of the flange 126 may be cut in correspondence with the thickness of the web 140.

By machining a portion of the flange 126 in this way, the slot 142 of the web 140 is vertically inserted through the cut-out portion of the flange 126, so that the web 140 is easier on the single barrier 120. Can be installed quickly.

As another example, as shown in FIG. 8, when the flange 126 is formed along the longitudinal direction of the rib 124, the web 140 ′ corresponds to the shape of the flange 126. Thus, the coupling hole 146 extending in the direction orthogonal to the slot 142 may be formed.

As such, the web 140 'includes a coupling hole 146 extending in a direction orthogonal to the slot 142, thereby assembling the web 140' to a plurality of single barriers 120 as shown in FIG. It can be installed on the inner side of the single barrier 120 by sliding to the side of the rib 124 in a sliding manner. In this case, unlike the example described above, it is not necessary to machine the flange 126 of the single barrier 120.

At this time, the webs 140 and 140 'fitted to the plurality of ribs 124 of the single barrier 120 are welded to the inner surfaces of the plurality of ribs 124 and the single barrier 120, as shown in FIG. Can be combined.

In the present embodiment, as shown in FIG. 9, an example in which the webs 140 and 140 ′ are installed in the middle region of the single barrier 120 is illustrated. However, the present invention is not limited thereto, and the webs 140 and 140 ′ are not limited thereto. ) May be installed, for example, at the point where sandwich barrier 110 and single barrier 120 meet (see FIGS. 5 and 6).

As described above, according to the construction method of the present invention, even in the sandwich barrier structure 110 including a pair of plates 112 and 114 facing each other, a single barrier structure 120 of the single panel structure in which the top plate is opened is to be welded to each other. By arranging and coupling between the pair of sandwich barriers 110, the rigidity of the sandwich barrier 110 can be increased to greatly improve the rigidity of the entire storage tank 100. In addition, since the end of the connecting plate 116 and the end of the rib 124 can be welded more easily, the stiffness of the liquefied gas storage tank 100 supporting the liquid cargo can be increased.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: primary barrier 2: secondary barrier
3: connecting plate 10: hull
1000: ship with liquefied gas storage tank
100: liquefied gas storage tank 102: internal space of the liquefied gas storage tank
110: sandwich barrier 112, 114: pair of plates
116: connecting plate 118: first through hole
119: second through hole 120: single barrier
122: plate 124: rib
126: flange 128: insertion groove
130: interior space
140, 140 ': web 142: slot
144: reinforcement 146: coupling hole
150: support portion 160: heat insulation layer
162: pad 170: drip tray

Claims (19)

A plurality of sandwich barriers having a sandwich panel structure in which a pair of plates are spaced apart from each other; And
It has a single panel structure, and includes a single barrier disposed between the plurality of sandwich barriers so that both ends are respectively coupled to the ends of the plurality of sandwich barriers,
An end portion of the sandwich barrier and an end portion of the single barrier adjacent to each other are welded to each other to form an liquefied gas storage tank.
The sandwich barrier,
It comprises a plurality of connecting plates disposed parallel to each other between the pair of plates and both ends are coupled to the pair of plates, respectively,
The single barrier is,
A liquefied gas storage tank comprising a plurality of ribs (rib) are arranged side by side on the inner side of the single barrier so that both ends are respectively coupled to the ends of the plurality of connecting plates arranged side by side.
delete delete delete delete The method of claim 1,
The sandwich barrier and the single barrier, respectively,
A liquefied gas storage tank, which is produced by extrusion molding, by combining individual plates with each other by welding, or by drawing. The method of claim 1,
Liquefied gas storage tank further comprises a web (web) is installed on the inner side of the single barrier to cross the plurality of ribs.
The method of claim 7, wherein
Liquefied gas storage tank, characterized in that the web is formed with a slot (slot) is inserted into the plurality of ribs.
9. The method of claim 8,
A flange is formed on an upper portion of the rib,
Liquefied gas storage tank, characterized in that the coupling hole is formed in the web corresponding to the flange extending in the direction orthogonal to the slot.
9. The method of claim 8,
The upper portion of the rib is formed with a flange,
Liquefied gas storage tank, characterized in that the insertion groove is formed in the flange orthogonal to the rib so that the web is inserted through.
9. The method of claim 8,
The web is a liquefied gas storage tank including a reinforcing portion extending in the width direction of the rib.
The method of claim 7, wherein
The web is liquefied gas storage tank, characterized in that each of the plurality of ribs and the inner wall of the single barrier welded.
The method of claim 12,
The upper portion of the rib is formed with a flange,
The web is liquefied gas storage tank, characterized in that welded to the flange of the plurality of ribs.
The method of claim 7, wherein
The web is liquefied gas storage tank, characterized in that installed at the point where the sandwich barrier and the single barrier.
15. The method of claim 14,
Liquefied gas storage tank, characterized in that the through hole is formed in each of the web and the rib.
The method of claim 1,
Liquefied gas storage tank further comprises a support disposed between the inner surface of the hull and the outer surface of the liquefied gas storage tank.
The method of claim 1,
Liquefied gas storage tank further comprises a heat insulating layer constructed by attaching a heat insulating panel on the outer surface of the liquefied gas storage tank.
The method of claim 1,
Liquefied gas storage tank further comprises a drip tray (drip tray) installed in the lower portion of the liquefied gas storage tank.
A hull;
A vessel comprising a liquefied gas storage tank according to any one of claims 1, 6 to 18 installed in the hull.

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