JP7131925B2 - Tank holding structure - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (Publication 1) Date of publication: October 30, 2017 Place of publication: Mitsubishi Chemical Infratech Co., Ltd. (Publication 2) Date of publication December 19, 2017 Place of publication Mitsubishi Chemical Infratech Co., Ltd. (Release 3) Release date: November 8, 2017 Location: Nitto Boseki Co., Ltd. (Kojimachi Odori Building, 2-4-1 Kojimachi, Chiyoda-ku, Tokyo) Characteristics of FRP materials (Publication 4) Date of publication November 16, 2017 Place of publication TEPCO Sekkei Co., Ltd. (1-7-12 Shinonome, Koto-ku, Tokyo) to Toray Industries, Inc. 1 No. 1) by phone and interview/meeting regarding the characteristics of FRP materials (Release 5) Date of release December 15, 2017 Place of release Toray Industries, Inc. (2-1-1 Nihonbashi Muromachi, Chuo-ku, Tokyo) ) for interviews/meetings regarding the characteristics of FRP materials

TECHNICAL FIELD The present invention relates to a tank holding structure for holding a tank installed in a coastal area in the event of 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 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 and closing opening, 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 was 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, LNG, and LPG leaked from the tanks, causing fires and pollution. ing.

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.

Here, a tank with a small amount of liquid inside has a smaller mass according to the amount of liquid, so it is easy to collapse due to the ground shaking caused by an earthquake or the wave force of a tsunami, and a tank that is almost full of liquid has a large mass. Therefore, it was thought that there was a low possibility that it would collapse and be swept away by the shaking of the ground caused by an earthquake or by the wave force of a tsunami.

However, it has been confirmed that in the Great East Japan Earthquake, even full tanks were swept away by the tsunami, the contents leaked, and ignited for some reason, causing 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.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a tank holding structure that can relatively easily prevent the tank from falling off from the base and drifting even when the tank is submerged in water due to flood damage or the like. and

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

A tank holding structure of the present invention is a structure for holding a tank installed in an area that can be submerged in water during a flood, and is made of a composite material of a fiber sheet and a resin material, and the tank is A fiber reinforced plastic provided to surround the tank on the side of the tank, a connecting means fixedly arranged on the side of the tank, and a fixing arranged indirectly or directly fixed to the ground and connecting means for connecting the connecting means and the fixing means , wherein the connecting means includes a ring-shaped connecting portion and a substantially rectangular plate-like or substantially rod-like fixing portion connected to the connecting portion. The fixing portion is sandwiched between the fiber-reinforced plastic surrounding the tank and the side surface of the tank and fixed to the side surface of the tank, and the connection portion is made of the fiber-reinforced plastic. characterized by protruding from

Further, in the tank holding structure of the present invention, it is preferable that the fixed portion is substantially rectangular plate-shaped or substantially rod-shaped , and is arranged such that its longitudinal direction is oriented vertically.

Further, in the tank holding structure of the present invention, the installation range of the fiber-reinforced plastic is set so as to include at least the expected buckling position of the tank and improve the buckling strength of the tank. more desirable.

In the tank holding structure of the present invention, since the connection means fixed to the tank by fiber reinforced plastic (FRP) and the fixing means fixed to the ground are connected by the connection means, the tank can be secured in the event of flood damage. It is possible to hold the tank even if wave force or buoyancy acts on the

Also, at this time, since the connection means is fixed to the side surface of the tank by the fiber reinforced plastic formed by wrapping the fiber sheet around the tank and affixing it, the external force acting on the connection means is transmitted to the fiber reinforced plastic. , it becomes possible to provide distributed support on a large area surface of the fiber-reinforced plastic rather than on points. Furthermore, the fiber-reinforced plastic can resist the tension of the connecting means not only by the force of adhesion to the side surface of the tank, but also by the force in the circumferential direction like hoop muscles. This makes it possible to hold the tank more reliably when a large external force acts on the tank.

Therefore, according to the tank holding structure of the present invention, it is installed in an area (coastal area, etc.) that can be submerged due to any flood damage such as tsunami, storm surge, typhoon, heavy rain, dam or embankment failure, and overflow. To prevent the tank from dropping off from the base and drifting even when the tank is submerged in water during flood damage.

It is a figure which shows the holding structure of the tank which concerns on one Embodiment of this invention.

Hereinafter, a tank holding structure according to an embodiment of the present invention will be described with reference to FIG.

The tank holding structure of this embodiment is intended 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. and relates to a structure for preventing the tank from being washed away even when it is submerged in water during flood damage.

Specifically, as shown in FIG. 1, the tank 1 of the present embodiment is, for example, a cylindrical oil tank for refueling a vessel such as a fishing boat. The upper opening is closed by a lid portion 1b having a relief valve and an opening/closing port, and the lower opening is closed by a bottom plate portion 1c so as to be sealed. An annular flange 1d projecting radially outward from the outer surface and extending in the circumferential direction is provided on the outer circumference of the lower end of the tank 1, and is fixedly installed on a base 6 made of concrete.

On the other hand, the tank holding structure A of the present embodiment includes FRP (Fiber-Reinforced Plastics: a composite material of fiber and resin materials, fiber reinforced plastic) 2 provided on the side surface 1e of the tank 1 so as to surround the tank 1. , FRP 2 is provided so as to surround the tank 1, connecting means 3 fixedly arranged on the side surface 1e of the tank 1, and fixing means 4 fixedly arranged on the ground G indirectly or directly. , and connecting means 5 for connecting the connecting means 3 and the fixing means 4 .

The FRP 2 of this embodiment is made by winding a fiber sheet (sheet-shaped fiber material) around the side surface 1e of the tank 1, impregnating it with an adhesive resin, and placing it at a desired height position on the side surface 1e of the tank 1 within a predetermined height range. is affixed so as to cover the

As the fibrous material of the FRP2, any fibrous material such as carbon fiber, aramid fiber, glass fiber, etc. can be used as long as it is applicable to the FRP2. 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.

As the resin material for the FRP 2, a resin material suitable for correcting unevenness of the bonded portion, surface treatment, undercoating, impregnation into the fiber material, finishing, etc. may be appropriately selected. 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 resin material of the FRP 2 does not need to be particularly limited either.

As the connection means 3, for example, an eyebolt (ring-shaped connection portion) 3a having a ring-shaped head and connecting the connection means 5, and a substantially rectangular plate-like or substantially rod-like fixing member (eye bolt) for bolting the eyebolt 3a. It is preferable to configure it with a fixed portion 3b such as a plate. In this embodiment, the eyebolt 3a is integrally formed with a ring-shaped head (connecting portion) and a bolt portion (shaft portion) having a male screw threaded on the outer periphery, and the fixing member 3b extends in the longitudinal direction. A female screw hole into which the bolt portion of the eyebolt 3a is screwed is formed at a predetermined position substantially in the center. In addition, the connecting means 3 according to the present invention only needs to include a ring-shaped connecting portion and a fixing portion connected to the connecting portion, and does not need to be limited to the configuration of this embodiment.

When the eyebolt 3a and the fixing member 3b are used as the connection means 3, the fixing member 3b to which the eyebolt 3a is bolted is fixed (temporarily adhered) to the side surface 1e of the tank 1 while the longitudinal direction thereof is vertically arranged. , the fiber sheet is wrapped around the side surface 1e of the tank 1, and the fiber sheet is pasted on the fixing member 3b to sandwich the fixing member 3b.

Thereby, the connection means 3 can be fixed to the side surface 1e of the tank 1 while projecting the ring-shaped head portion of the eyebolt 3a. Further, in this embodiment, a plurality of such connection means 3 are provided at predetermined intervals in the circumferential direction around the axis O1 of the tank 1 .

The anchoring means 4 of this embodiment is a ground anchor and is driven into the ground G outside the tank 1 and the base 6 . Further, a plurality of fixing means 4 are provided at predetermined intervals along the circumferential direction of the center of the axis O1 of the tank 1 so as to correspond to each of the plurality of connecting means 3 .

The connecting means 5 of this embodiment is a cord-like body such as a wire, and is disposed with one end connected to the eyebolt 3a of the connecting means 3 and the other end connected to the ground anchor of the fixing means 4, respectively. Further, by providing a tension adjusting means capable of appropriately adjusting the tension of the cord-like body, the cord-like body can be provided with a desired moderate tension.

The connection means 3 is attached to the side surface 1e of the tank 1 together with the FRP 2, and if it can be connected to the fixing means 4 via the connection means 5, there is no particular need to limit its configuration. Further, the anchoring means 4 may be anchored directly to the ground G, or indirectly anchored to the ground G by being attached to the base 6 or a nearby heavy object, and is not necessarily limited to a ground anchor. Furthermore, the connecting means 5 may not necessarily be a cord-like body as long as it is possible to connect the connecting means 3 and the fixing means 4 .

Next, when providing the tank holding structure A of the present embodiment, the side surface 1e of the tank 1 is appropriately corrected for irregularities and surface treatment is performed, and then the fixing members 3b are temporarily bonded to connect the plurality of connection means 3 to the tank 1. is arranged at a predetermined position on the side surface 1e of the FRP 2, undercoating, winding of the fiber sheet, and impregnation adhesion of the fiber sheet are performed to form the FRP 2. At this time, the FRP 2 may be formed by laminating a plurality of fiber sheets, or the fiber directions of the fiber sheets of each layer may be oriented in different desired directions.

Also, the surface of the FRP 2 is finished with a coating. In addition, it is not always necessary to perform finishing coating.

Here, the FRP installation region (tank-side fiber sheet bonding range) M where the fiber sheet is bonded to the side surface 1e of the tank 1 does not need to be particularly limited, but for example, elephant foot buckling, lantern buckling, diamond seat Considering the position of tank buckling that may occur when an external force such as an earthquake acts on the tank 1, it is preferable to set the predicted buckling occurrence position so that it can be reinforced. That is, it is preferable to set the installation area of the FRP 2 so as to deter/prevent damage to the tank 1 due to an external force such as an earthquake.

Then, one end side and the other end side of the wire of the connecting means 5 are connected to the ground anchor of the fixing means 4 driven into the ground G and the ring-shaped head of the eyebolt 3a of the connecting means 3. The tank holding structure A of the embodiment is completed.

In the tank holding structure A of this embodiment having the above configuration, the eyebolt 3a of the connecting means 3 fixed to the tank 1 by the FRP 2 and the ground anchor of the fixing means 4 fixed to the ground G are connecting means. Since it is connected by the cord-like body 5, it becomes possible to hold the tank 1 even if wave force or buoyancy acts on the tank 1 during flood damage.

Further, at this time, since the fixing member 3b of the connection means 3 is fixed to the side surface 1e of the tank 1 by the FRP 2 formed by winding the fiber sheet around the tank 1 and pasting it, the connection means 3 is affected. It becomes possible to transmit an external force to the FRP 2, not to a point, but to a large area surface of the FRP 2 for support. Furthermore, the FRP 2 can resist the wire tension not only by the force of adhesion to the side surface 1e of the tank 1, but also by the force in the circumferential direction like a hoop muscle. This makes it possible to more reliably hold the tank 1 when a large external force acts on the tank 1 .

Therefore, according to the tank holding structure A of the present embodiment, it is installed in an area (coastal area, etc.) that can be submerged in water due to any flood damage such as tsunami, storm surge, typhoon, heavy rain, dam or embankment failure, and overflow. Even when the tank 1 which has been installed is submerged in water at the time of flood damage, the tank 1 can be prevented from dropping off from the base 6 and drifting.

Furthermore, in the tank holding structure A of the present embodiment, since it is not necessary to use firearms such as welding to install the FRP 2, the connecting means 3, the fixing means 4, and the connecting means 5, a large number of them are installed in coastal areas such as fishing ports. It can also be suitably adopted for an oil tank (or gas tank), etc.

Furthermore, by setting the installation range M of the FRP 2 so as to include at least the location where buckling of the tank 1 is expected to occur, the tank 1 can be effectively reinforced, and the seat of the tank 1 can be secured in the event of an earthquake or the like. Flexion and damage can be prevented by FRP2.

Although one embodiment of the tank 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.

1 Tank 1a Body 1b Lid 1c Bottom plate 1d Flange 1e Side 2 FRP (fiber reinforced plastic, composite material of fiber sheet and resin material)
3 Connecting Means 3a Eyebolt (ring-shaped connecting portion)
3b fixing member (fixing part)
4 anchoring means (ground anchor)
5 Connecting means (cords, wires)
6 Base A Tank holding structure O1 Axis M Installation area/range of FRP

Claims (3)

A structure for holding a tank installed in an area that can be submerged in water when it is submerged in water,
A fiber reinforced plastic that is a composite material of a fiber sheet and a resin material and is provided on the side surface of the tank so as to surround the tank ;
connecting means fixedly arranged on the side of the tank;
anchoring means indirectly or directly fixed to the ground;
connecting means for connecting the connecting means and the fixing means ;
The connecting means are
a ring-shaped connection;
a substantially rectangular plate-like or substantially rod-like fixing portion connected to the connecting portion;
The fixed part is sandwiched between the fiber-reinforced plastic surrounding the tank and the side surface of the tank and fixed to the side surface of the tank,
The holding structure for a tank , wherein the connecting portion protrudes from the fiber-reinforced plastic . In the tank holding structure according to claim 1 ,
A holding structure for a tank, wherein the fixed portion has a substantially rectangular plate shape or a substantially rod shape, and is arranged with its longitudinal direction directed vertically. In the tank holding structure according to claim 1 or claim 2,
A holding structure for a tank, wherein the installation range of the fiber-reinforced plastic is set so as to improve the buckling strength of the tank, including at least the expected buckling position of the tank.

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