JP7296730B2 - Tank waterproofing and retention structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a waterproofing and holding structure for a tank installed in a coastal area or the like for preventing water from entering between the bottom of the tank and the base during flood damage.

Coastal areas such as ports are provided with oil tanks and gas tanks for refueling ships such as fishing boats (see, for example, Patent Documents 1 and 2).

For example, an oil tank for refueling a fishing boat is installed outdoors on a concrete base or the like provided inside a concrete ring-shaped oil barrier.

This type of tank is made of steel, and is formed so that the upper opening of the cylindrical body is closed with a lid provided with a relief valve and an opening/closing port, and the lower opening is closed with a bottom plate so that it can be sealed. . In addition, an annular flange that protrudes radially outward from the outer surface of the tank and extends in the circumferential direction is provided on the outer circumference of the lower end of the tank. Penetration is formed.

The cylindrical tank configured as described above is fixed and installed on the base by inserting the anchor bolt fixed to the base made of concrete into the bolt insertion hole of the flange and tightening the nut. there is

JP 2017-149449 A JP 2015-227182 A

On the other hand, it has been confirmed and reported that in the Great East Japan Earthquake, many tanks installed in coastal areas were washed away by the tsunami, and flammable liquids such as petroleum and heavy oil leaked from the tanks, causing fires and pollution. .

In addition, it has been confirmed that many small tanks installed outdoors near fishing ports to refuel fishing boats were swept away by the tsunami.

In the Great East Japan Earthquake, it has been confirmed that even full-liquid tanks were swept away by the tsunami, and the contents leaked, ignited for some reason, and caused a fire. It is also possible that the washed-away tanks collided and damaged structures such as buildings.

It has also been confirmed and reported that many of the small tanks used to refuel fishing boats were pulled out of their bases and adrift by the buoyancy of the water, not by the impact of the tsunami waves. there is Furthermore, it is believed that water entered between the bottom of the tank and the base, causing a large buoyancy to act on the tank, causing the tank to fall off the base.

Therefore, there is a strong demand for a technique that can prevent the tank from dropping off from the base and drifting even when the tank is submerged in water due to flood damage or the like. In addition, it is strongly desired that the tank can withstand tilting due to earthquake vibrations that occur before a tsunami and lifting due to buoyancy caused by water intrusion when immersed in water.

In view of the above circumstances, the present invention has been made to relatively easily prevent floating, dropping, and drifting from the base of the tank even when the tank is tilted or when the tank is submerged in water due to flood damage or the like. It is an object of the present invention to provide a waterproof and holding structure for a tank capable of

In order to achieve the above objects, the present invention provides the following means.

The waterproofing and holding structure for a tank of the present invention is designed to prevent the tank from being submerged in water between the bottom of the tank placed on the installation surface of the base and the base in an area that is likely to be submerged in the event of a flood. The structure prevents water from entering into the tank, does not generate buoyancy in the tank, and prevents the tank from falling off from the base and drifting due to the adhesive force of the sheet-like FRP fiber material, wherein the FRP The fiber material is continuously coated and adhered from the lower side surface of the tank to the base to provide waterproofing between the tank and the base, and the FRP fiber material is formed to cover the lower side surface of the tank. a first holding portion that is bonded to the side surface of the tank and holds the side surface of the tank; a second holding part that forms a space above an annular flange that protrudes outward and extends in the circumferential direction; and a third holding part for holding the side surface and the upper surface of the base, and the FRP fiber material supports the tank and the base when the tank is tilted due to the wave force of an earthquake, tsunami, or flood damage. It follows the base and is deformable so that the attachment angle between the holding portions of the FRP fiber material changes, and is sandwiched between the upper surface of the flange and the lower surface of the second holding portion in the space. A waterproofing and retaining structure for a tank characterized by comprising elastic members arranged in such a manner as to:

In the tank waterproofing and holding structure of the present invention, since the tank holding portion is formed from the side surface of the tank to the side surface of the base, even if the tank is submerged in water due to water damage, the bottom of the tank and the base can still be secured. It is possible to prevent the occurrence of large buoyancy caused by this because water does not enter between them. In this way, in the waterproofing and holding structure of the tank of the present invention, the holding structure in which the elastic member and the FRP fiber material can be deformed does not generate excessive stress in the tank, and it follows the deformation of the earthquake, tsunami, and flood damage. It becomes possible to hold.

Further, according to the present invention, an elastic member is provided in the space formed in the second holding portion, and when the tank is tilted, the elastic member presses against the flange provided at the lower end of the tank and the second holding portion. By being elastically deformed, the force can be distributed over the surface of the tank holding portion, and localized force can be prevented from being applied to the tank holding portion.

Further, according to the present invention, by holding the tank planarly with the first holding portion instead of the anchor bolts, it is possible to prevent the tank from being locally destroyed when a large external force acts due to an earthquake, tsunami, or the like. .

Therefore, according to the waterproofing and holding structure of the tank of the present invention, when the tank is tilted due to an earthquake, it can withstand all kinds of flood damage such as tsunami, storm surge, typhoon, heavy rain, dam and embankment failure, and overflow. Even when a tank installed in an area (coastal area, etc.) that can be submerged in water is submerged in water during flood damage, the tank can be prevented from rising from the base, falling off, and drifting.

It is a figure which shows the waterproofing and holding structure of the tank which concerns on one Embodiment of this invention. It is the figure which expanded a part of holding structure. It is a figure which shows the state which inclination arises in the tank.

Hereinafter, a waterproofing and holding structure for a tank according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

The waterproofing and holding structure of the tank of this embodiment is for tanks installed in areas (coastal areas, etc.) that can be submerged due to any flood damage such as tsunamis, storm surges, typhoons, heavy rains, dam or embankment failures, and overflows. The object is to prevent the tank from rising and being swept away even when it is submerged in water at the time of flood damage, and it relates to a structure that can withstand the inclination of the tank.

Specifically, as shown in FIG. 1, the tank 1 of the present embodiment is, for example, a cylindrical oil tank for refueling ships such as fishing boats. The tank 1 is made of steel, for example, and is formed so that the upper opening of the cylindrical body 1a is closed with a lid 1b having a relief valve and an opening and closing opening, and the lower opening is closed with a bottom plate 1c. It is An annular flange 1d protruding radially outward from the outer surface of the tank 1 and extending in the circumferential direction is provided on the outer periphery of the lower end of the tank 1, and is placed on the mounting surface of the base 6 made of concrete. The tank 1 may be an existing one or a newly installed one. The base 6 is, for example, cylindrical. The base 6 may be formed in a rectangular columnar shape, or may have another shape.

On the other hand, as shown in FIGS. 1 and 2, the tank waterproofing and holding structure R of the present embodiment is integrally formed of FRP (Fiber-Reinforced Plastics: fiber-reinforced plastic). and an elastic member D made of an elastic material. The tank holding portion A is continuously coated and adhered from the side surface 1e of the tank 1 to the side surface 6a through the installation surface (upper surface 6b) of the base 6. As shown in FIG. Thereby, the tank holding part A holds the tank 1 with respect to the base 6 . The tank holding portion A includes, for example, a first holding portion A1 that holds the body portion 1a of the tank 1 .

The first holding portion A1 extends along the circumferential direction of the side surface 1e in the lower portion of the body portion 1a and is formed in a cylindrical shape so as to cover the side surface 1e. The first holding portion A1 is adhered to the lower side surface 1e of the body portion 1a and holds the lower portion of the tank 1, as will be described later. A second holding portion A2 is formed continuously from the lower end portion of the first holding portion A1.

The second holding portion A2 extends, for example, around the lower end of the first holding portion A1, and has an annular top portion A2T protruding radially outward with respect to the axis O1 of the tank 1, and a top portion A2T. and a side surface portion A2S that extends downwardly from the peripheral end portion of the A2T. The inner diameter of the top portion A2T is formed to be larger than that of the flange 1d. The inner diameter of the side surface portion A2S is also formed to be larger than that of the flange 1d. Thereby, an annular space S is formed above the flange 1d inside the second holding portion A2. A third holding portion A3 is formed continuously from the lower end portion of the second holding portion A2.

The third holding portion A3 extends, for example, around the lower end portion of the side portion A2S of the second holding portion A2 and has an annular top portion protruding radially outward with respect to the axis O1 of the tank 1. A3T, and a side surface portion A3S that extends downward from the peripheral edge of the top portion A3T. The annular top portion A3T is adhered to the upper surface 6b of the base 6 as described later. The third holding portion A3 extends along the circumferential direction above the side surface 6a of the base 6 and is formed in a cylindrical shape so as to cover the side surface 6a. The third holding portion A3 is adhered to the upper portion of the side surface 6a of the base 6 and holds the upper portion of the base 6 as will be described later.

For example, an elastic member D having an annular shape is provided in the space S in the second holding portion A2. The elastic member D is provided so as to be sandwiched between the upper surface of the flange 1d and the lower surface of the top portion A2T of the second holding portion A2. The elastic member D is made of an elastic material such as rubber or urethane sponge. The elastic member D does not necessarily have to be integrally formed. The elastic member D may be formed of a plurality of elastic bodies arranged at equal intervals in the circumferential direction on the flange 1d.

Next, waterproofing of the tank and construction of the holding structure R will be described. As described above, the tank holding portion A is integrally molded from FRP. In FRP, after affixing a fibrous material to an area to be bonded, the fibrous material is impregnated with a resin material, and the resin material is cured to form a member into a desired shape.

Carbon fiber, aramid fiber, glass fiber, etc. are used as the fiber material of FRP. Other fibrous materials may be used as long as they are applicable to FRP.

In addition, a suitable fiber material is formed into a sheet by aligning the fiber direction in one direction, or, for example, by directing the fiber direction in one direction and the other direction perpendicular to the other direction and forming the sheet by interweaving the fiber. It is mentioned as. In addition, the type of fiber of the fibrous material, the fiber direction, etc. do not necessarily have to be limited. Also, the tank holding portion A may be made of a composite material in which other materials are combined in addition to FRP.

As the resin material for the FRP, a resin material suitable for correcting unevenness of the bonded portion, surface treatment, undercoating, impregnation into the fiber material, finishing, etc., may be appropriately and selectively used. For example, for undercoating, impregnation into textile materials, etc., desired adhesive strength, impregnation performance, etc. are exhibited, and for finishing materials, such as epoxy resins and acrylic resins, desired weather resistance and appearance can be secured. Resins, fluorine resins, and the like can be mentioned. The FRP resin material is not particularly limited.

First, the elastic member D is placed on the flange 1 d of the tank 1 installed on the upper surface 6 b of the base 6 . After that, the side surface 1e of the tank 1, the upper surface 6b of the base 6, and the side surface 6a are properly corrected, and after the base treatment, undercoating, and impregnation adhesion of the fiber sheet are performed. At this time, the fiber material is continuously attached to the side surface 1e of the tank 1, the exposed surface of the elastic member D, the upper surface 6b of the base 6, and the side surface 6a of the base 6. As shown in FIG.

Then, the side surface 1e of the tank 1 is arranged so that the fiber direction of the side surface 1e of the tank 1, the exposed surface of the elastic member D, the end portion of the flange 1d, the upper surface 6b of the base 6, and the side surface 6a of the base 6 faces the vertical direction. , the exposed surface of the elastic member D, the bonding target region V2 of the end of the flange 1d, the bonding target region V3 of the upper surface 6b of the base 6 and the side surface 6a of the base 6, and the first layer continuously A fiber sheet (first fiber sheet) 8 is attached. In addition, a plurality of first-layer fiber sheets 8 are arranged continuously around the tank 1 in the same manner as described above so that the first-layer fiber sheets 8 are continuously arranged in the circumferential direction around the axis O1 extending in the vertical direction of the tank 1 . Glued in all directions.

Here, since the elastic member D moves and deforms together with the flange 1d as described later, the fiber sheet 8 is not adhered to the exposed surface of the elastic member D and the bonding target region V2 at the end of the flange 1d. It may be impregnated with a resin material only. Therefore, a release agent may be applied to the exposed surface of the elastic member D and the end of the flange 1d.

The side surface 1e of the tank 1, the end of the flange 1d, the upper surface 6b of the base 6, and the side surface 6a can be appropriately corrected for irregularities and surface treatments such as scraping, high-pressure washing, corner R finishing, and putty coating. etc. From the viewpoint of securing the adhesiveness of the fiber sheet 8, the above means are selectively carried out as necessary.

Next, a second-layer fiber sheet (second fiber sheet) 9 is pasted on the first-layer fiber sheet 8 with the fiber direction oriented in the circumferential direction (horizontal direction). At this time, the fiber sheet 9 of the second layer is continuously wound around the bonding target areas V1 to V3 of the fiber sheet 8 of the first layer. The tank-side bonding target region V1 and the base-side bonding target region V3 of the first-layer fiber sheet 8 are individually pasted so as to be sandwiched between the tank 1 and constrained. In addition to this, the second-layer fiber sheet 9 is additionally pasted on the exposed surface of the elastic member D of the first-layer fiber sheet 8 and the adhesion target area V2 at the end of the flange 1d.

In addition, on the second layer of the fiber sheet 9, a fiber sheet may be further laminated with the fiber direction oriented in the vertical direction or the circumferential direction, and the fiber sheet may be laminated in multiple layers.

Also, the bonding target region V1 on the side of the tank 1 where the fiber sheets 8 and 9 are bonded to the side surface 1e of the tank 1 does not need to be particularly limited. Considering the position of tank buckling that may occur when an external force such as an earthquake acts on the tank 1 (tank buckling expected position), the installation range is designed so that this buckling position is reinforced and the buckling strength is improved. It should be set. That is, it is desirable to set the adhesion target region V1 on the side of the tank 1 so as to deter/prevent damage to the tank 1 due to an external force such as an earthquake.

In addition, the tank holding portion A may be formed by bonding a member formed by being divided in the vertical direction in advance to the adhesion target area, and FRP may be applied so as to close and reinforce the divided portion. Also, a pre-formed member may be adhered so as to cover the divided portion. When forming a member in advance, a mold may be created by measuring an area to be adhered using a three-dimensional scanner or the like.

Sealing materials are filled between the end of the first holding portion A1 and the side surface 1e of the tank 1 and between the end of the second holding portion A2 and the side surface 6a of the base 6, and the tank holding portion The watertightness of A is ensured.

Finally, the finish coating of the surface of the tank holding part A is performed. At this time, as the finish coating, a coating that blocks ultraviolet rays may be used in order to prevent the elastic member D from deteriorating. Alternatively, the surface of the tank holding portion A may be covered with a covering material such as a film instead of finishing coating. Through the above steps, the holding structure R for the tank 1 of the present embodiment is completed. In addition, it is not always necessary to perform finishing coating.

Next, the state of the holding structure R when the tank 1 moves will be described.

As shown in FIG. 3, when the tank 1 is tilted by an external force due to an earthquake or the like, the bottom plate portion 1c is separated upward from the upper surface 6b of the base 6. As shown in FIG. At this time, the first holding portion A1 holds the tank 1, and the third holding portion A3 holds the base 6. As shown in FIG. In this state, the second holding portion A2 is pulled by the first holding portion A1 and the third holding portion A3, and is deformed so that the attachment angle between the top portion A2T and the side portion A2S widens.

In the space S within the second holding portion A2, the elastic member D is elastically deformed by being pressed by the upper surface of the flange 1d and the lower surface of the top portion A2T of the second holding portion A2. The elastically deformed elastic member D planarly disperses the force generated by the displacement of the tank 1 to the top portion A2T of the second holding portion A2. As a result, the tank holding portion A is prevented from being locally subjected to force and damaged.

When a tsunami surges after an earthquake occurs, the FRP (fiber sheets 8 and 9) of the holding structure R of the tank 1 of this embodiment configured as described above is pushed from the side surface 1e of the tank 1 to the base 6. Since the bottom plate portion 1c of the tank 1 is attached to the side surface 6a and is attached continuously in the circumferential direction of the tank 1 and the base 6 in an annular shape, even if the tank 1 is submerged in water due to flood damage, the bottom plate portion 1c of the tank 1 Water does not enter between the base and the base 6, and generation of large buoyancy due to this can be prevented. Furthermore, as described above, since the tank holding portion A is prevented from being damaged when an earthquake occurs, water does not enter between the bottom plate portion 1c of the tank 1 and the base 6.

In addition, since at least the first layer of the fiber sheet 8 in the bonding target area is affixed from the side surface 1e of the tank 1 to the side surface 6a of the base 6 with the fiber direction oriented in the vertical direction, the tank 1 is protected against earthquakes and flood damage. Even if an external force sometimes acts, the tank 1 can be effectively held by effectively utilizing the strong tensile strength of the fiber sheet 8 arranged with the fiber direction oriented in the vertical direction. .

Furthermore, the tank side bonding portion 3 and the base side side bonding portion 7 of the fiber sheet 8 pasted from the side surface 1e of the tank 1 to the side surface 6a of the base 6 with the fiber direction oriented in the vertical direction are attached to the tank 1 and the base, respectively. Since the base 6 is continuously wound and affixed by the second-layer fiber sheet 9 , the fiber sheet 8 is clamped and restrained, so that even if a large external force acts on the tank 1 , the fiber sheet 8 can be pulled from the tank 1 or the base 6 . , 9 can be effectively suppressed/prevented from peeling off.

In addition, by supporting the tank 1 with FRP instead of anchor bolts, it becomes possible to support the tank 1 not at a point but at a surface. can be prevented from occurring.

Furthermore, by setting the bonding target region V1 of the fiber sheet 8 so as to include at least the predicted buckling occurrence position of the tank 1, the tank 1 can be effectively reinforced, and the tank can be secured when an earthquake or the like occurs. 1 can be prevented from buckling and damage by the first holding portion A1.

Therefore, according to the tank waterproofing and holding structure R of the present embodiment, the tank 1 can be reliably held even if the tank 1 is tilted. Further, according to the tank waterproofing and holding structure R, the elastic member D prevents the tank holding portion A from being locally subjected to force, thereby preventing the tank holding portion A from being damaged and causing damage to the tank 1. Vibration can be damped.

In addition, according to the waterproof and holding structure R of the tank, it is installed in areas (coastal areas, etc.) that can be submerged due to all types of flood damage such as tsunamis, storm surges, typhoons, heavy rains, dam and embankment failures, and overflows. Even when the tank 1 is submerged in water during flood damage, the tank holding part A is prevented from being damaged due to displacement of the tank 1, and the tank 1 is prevented from dropping off from the base 6 and drifting.

Furthermore, in the tank waterproofing and holding structure R of the present embodiment, since it can be provided in the tank 1 without using equipment that generates sparks such as welding, oil It can also be suitably used for tanks, gas tanks, and the like.

Although one embodiment of the tank waterproofing and holding structure according to the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the invention. For example, in order to prevent separation between the tank holding portion A and the base 6, reinforcement may be provided by fastening using an appropriate anchor bolt and nut.

Further, the corner portion where the side surface 6a and the upper surface 6b of the base 6 intersect may be formed with a smoothly continuous curved surface. Alternatively, when constructing the fiber sheets 8 and 9, the corners where the side surface 6a and the upper surface 6b of the base 6 intersect are scraped off, or the base 6 is filled with concrete to form the corners into curved surfaces. may As a result, the corners where the side surface portion A3S and the top portion A3T of the third holding portion A3 intersect may be curved. As a result, when the tank 1 is tilted and the third holding portion A3 is deformed, the third holding portion A3 may be prevented from being damaged and water may be prevented from entering. Similarly, the corner where the top A2T of the second holding portion A2 intersects with the side portion A2S and the corner where the second holding portion A2 and the third holding portion A3 are connected are formed to be curved surfaces. may

1 Tank 1a Body 1b Lid 1c Bottom plate 1d Flange 1e Side 6 Base 6a Side 6b Upper surface 8 First fiber sheet (first fiber sheet)
9 Second layer fiber sheet (second fiber sheet)
A Tank holding portion A1 First holding portion A2 Second holding portion A3 Third holding portion D Elastic member O1 Axis line R Tank waterproofing and holding structure V1 to V3 Area to be adhered

Claims (1)

In an area that can be submerged in water at the time of flood damage, the tank is placed between the base and the bottom of the tank placed on the installation surface of the base, and when the tank is submerged in water , the water is prevented from entering the tank. A structure that does not generate buoyancy and prevents the tank from falling off from the base and drifting due to the adhesive force of the sheet-like FRP fiber material,
The FRP fiber material is continuously coated and adhered from the lower part of the side surface of the tank to the base, and the space between the tank and the base is waterproofed,
The FRP fiber material is
a first holding part formed to cover a lower part of the side surface of the tank and adhered to the side surface of the tank to hold the side surface of the tank; a second holding portion that forms a space above an annular flange that protrudes radially outward from an outer periphery of a lower end portion of the tank and extends in the circumferential direction; and a third holding part formed by bonding so as to cover the upper surface and holding the side surface and the upper surface of the base ,
The FRP fiber material follows the tank and the base when the tank tilts due to the wave force of an earthquake, tsunami, or flood damage, and deforms so that the attachment angle between the holding portions of the FRP fiber material changes. provided that it is possible to
A waterproofing and holding structure for a tank, wherein an elastic member is arranged in the space so as to be sandwiched between an upper surface of the flange and a lower surface of the second holding portion.

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