JP2019151346A - Holding structure for tank - Google Patents

Abstract

To provide a holding structure for a tank, capable of preventing the tank from dropping from a tank base and from drifting in a relatively simple manner even when the tank is submerged in water at flood disaster or the like.SOLUTION: A holding structure for a tank is a structure A for holding a tank 1, which is installed in a region prone to be submerged at flood disaster, in the case that the tank is submerged. The holding structure for a tank comprises: a fiber-reinforced plastic 2, which is a composite material including a fiber sheet and a resin material, arranged onto a side surface 1e of the tank 1 to surround the tank 1; connection means 3, which causes the fiber-reinforced plastic 2 to surround and to be attached onto the tank 1, and which is fixed onto the side surface 1e of the tank 1; fixation means 4, which is indirectly or directly fixed onto the ground G; and coupling means 5 coupling the connection means 3 and the fixation means 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tank holding structure for holding a tank provided in a coastal area during a flood.

  In coastal areas such as harbors, oil tanks and gas tanks for refueling ships such as fishing boats are provided (see, for example, Patent Document 1 and Patent Document 2).

  For example, an oil tank for refueling a fishing boat is installed outdoors and is installed on a concrete base made of concrete and provided inside an annular oil barrier.

  This type of tank is made of steel, and is formed so that it can be sealed by closing the upper opening of the cylindrical body with a lid provided with a relief valve and an opening and closing, and closing the lower opening with a bottom plate. . In addition, an annular flange that protrudes radially outward from the outer surface and extends in the circumferential direction is provided on the outer periphery of the lower end of the tank, and a plurality of bolt insertion holes are provided in the flange at predetermined intervals in the circumferential direction. It is formed through.

  The cylindrical tank constructed as described above is fixedly installed on the base by inserting the anchor bolt fixed on the concrete base into the bolt insertion hole of the flange and fastening the nut. Yes.

JP 2017-149449 A JP2015-227182A

  On the other hand, in the Great East Japan Earthquake, many tanks installed in the coastal area were washed away by the tsunami, and it was confirmed and reported that flammable liquids such as oil, LNG, and LPG leaked from the tanks, resulting in fires and pollution. ing.

  In addition, it has been confirmed that many small tanks installed outside the fishing port and used to refuel fishing boats were washed away by the tsunami.

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

  However, in the Great East Japan Earthquake, it was confirmed that the full tank was also washed away due to the tsunami, the content liquid leaked and ignited for some reason, causing a fire. There is a possibility that the washed tank collided and damaged structures such as buildings.

  Also, it was confirmed and reported that many of the small tanks for refueling fishing boats were not drawn by the tsunami wave force, but were pulled out of the base and drifted due to the buoyancy acting in the water. Yes. Furthermore, it is believed that the water entered between the bottom of the tank and the base caused a large buoyancy to act on the tank, causing dropout from the base.

  Therefore, even when the tank is immersed in water due to water damage or the like, a technique that can prevent the tank from falling off and drifting from the base is strongly desired.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tank holding structure that can prevent the tank from falling off and drifting relatively easily even when the tank is immersed in water due to water damage or the like. And

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

  The tank holding structure of the present invention is a structure for holding a tank installed in an area where it can be immersed in water in the event of a flood, and is a composite material of a fiber sheet and a resin material. A fiber reinforced plastic provided on the side of the tank to surround the tank, a connection means provided on the side of the tank and provided with the fiber reinforced plastic to surround the tank, and indirectly or It is characterized by comprising fixing means arranged directly fixed to the ground, and connecting means for connecting the connecting means and the fixing means.

  In the tank holding structure of the present invention, 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, and the longitudinal direction is directed vertically. The fiber reinforced plastic is provided so that the fixed portion arranged in a manner surrounds the tank, and is sandwiched between the fiber reinforced plastic and the side surface of the tank and fixed to the side surface of the tank. It is desirable to project outside the side surface of the tank.

  Further, in the tank holding structure of the present invention, the fiber reinforced plastic may have an installation range set so as to improve the buckling strength of the tank including at least a predicted position of buckling occurrence of the tank. More desirable.

  In the tank holding structure of the present invention, the connecting means fixed to the tank with fiber reinforced plastic (FRP) and the fixing means fixed on the ground are connected by the connecting means, so that the tank is protected in the event of a flood. Even if wave force or buoyancy acts on the tank, the tank can be held.

  At this time, the connection means is fixed to the side surface of the tank by the fiber reinforced plastic obtained by winding the fiber sheet around the tank, and the external force acting on the connection means is transmitted to the fiber reinforced plastic. It becomes possible to disperse and support not only in terms of points but also in terms of the large area of fiber reinforced plastic. Furthermore, the fiber reinforced plastic can counter the tension of the connecting means not only by the adhesion force to the side surface of the tank but also by a circumferential force like a hoop. This makes it possible to hold the tank more reliably when a large external force is applied to the tank.

  Therefore, according to the holding structure of the tank of the present invention, it was installed in an area (coastal area, etc.) that can be immersed in water due to any flood damage, such as tsunami, storm surge, typhoon, heavy rain, dam or levee break, overflow Even when the tank is immersed in water at the time of flooding, the tank can be prevented from falling off the base and drifting.

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

  A tank holding structure according to an embodiment of the present invention will be described below with reference to FIG.

  The tank holding structure of this embodiment is intended for tanks installed in areas that can be submerged in water (such as coastal areas) such as tsunamis, storm surges, typhoons, heavy rains, dams and levee breaks, and overflows. In addition, the present invention relates to a structure for preventing the tank from flowing even when it is immersed in water during a flood.

  Specifically, as shown in FIG. 1, the tank 1 of this embodiment is a cylindrical oil tank for supplying fuel to a ship such as a fishing boat, and is made of steel and has a cylindrical body 1a. 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. Further, an annular flange 1 d that protrudes radially outward from the outer surface and extends in the circumferential direction is provided on the outer periphery of the lower end portion of the tank 1, and is fixedly installed on the concrete base 6.

  On the other hand, the tank holding structure A of the present embodiment has an FRP (Fiber-Reinforced Plastics: fiber material and resin material composite, fiber reinforced plastic) 2 provided on the side surface 1e of the tank 1 so as to surround the tank 1. The FRP 2 is provided so as to surround the tank 1 and is connected to the side surface 1e of the tank 1 so as to be fixed, and the fixing means 4 is fixed to the ground G indirectly or directly. The connecting means 3 and the fixing means 4 are connected to the connecting means 5.

  In the FRP 2 of the present embodiment, a fiber sheet (sheet-like fiber material) is wound around the side surface 1e of the tank 1 and impregnated with an adhesive resin, and a predetermined height range is provided at a desired height position on the side surface 1e of the tank 1. It is stuck so as to cover.

  As the fiber material of FRP2, any fiber material can be used as long as it is applicable to FRP2, such as carbon fiber, aramid fiber, and glass fiber. Also suitable is a fiber material that is formed in a sheet shape with the fiber direction aligned in one direction, or that is formed into a sheet shape by weaving the fibers in the other direction perpendicular to the one direction and the one direction, for example. As mentioned. In addition, the kind of fiber of a fiber material, a fiber direction, etc. do not necessarily need to be limited.

  As the FRP2 resin material, resin materials suitable for uneven adhesion correction, surface treatment, undercoating, fiber material impregnation, finishing, and the like may be selectively used as appropriate. For example, urethane that can exhibit desired adhesion strength, impregnation performance, etc. for undercoating and fiber impregnation, etc., and finish materials such as epoxy resins and acrylic resins that can ensure desired weather resistance and appearance. Examples thereof include resins and fluororesins. The FRP2 resin material is not particularly limited.

  As the connecting means 3, for example, the head is formed in a ring shape, and an eyebolt (ring-shaped connecting portion) 3a for connecting the connecting means 5 and a substantially rectangular plate-like or rod-like fixing member (eye) for bolting the eyebolt 3a. It is preferable to configure 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) whose outer periphery is threaded with a male screw, and the fixing member 3b is in the length direction. A female screw hole for screwing the bolt portion of the eyebolt 3a is formed at a predetermined position substantially at the center. In addition, the connection means 3 which concerns on this invention should just be provided with the ring-shaped connection part and the fixing | fixed part connected to a connection part, and does not need to be limited to the structure of this embodiment.

  When the eyebolt 3a and the fixing member 3b are used as the connecting means 3, the fixing member 3b to which the eyebolt 3a is bolted is fixed (temporarily bonded) to the side surface 1e of the tank 1 with the longitudinal direction being arranged in the vertical direction. The fiber sheet is stuck on the fixing member 3b while the fiber sheet is wound around the side surface 1e of the tank 1, and the fixing member 3b is sandwiched.

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

  The fixing means 4 of the present embodiment is a ground anchor and is placed on the ground G outside the tank 1 and the base 6. 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 the present embodiment is a cable-like body such as a wire, and is disposed with one end connected to the eyebolt 3 a of the connecting means 3 and the other end connected to the ground anchor of the fixing means 4. Further, by providing 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 connecting means 3 is not particularly limited as long as it is attached to the side surface 1e of the tank 1 together with the FRP 2 and can be connected to the fixing means 4 via the connecting means 5. The fixing unit 4 may be fixed to the ground G directly or indirectly to the ground G by being attached to the base 6 or a nearby heavy object, and is not necessarily limited to the ground anchor. Further, the connecting means 5 is not necessarily a cord-like body as long as the connecting means 3 and the fixing means 4 can be connected.

  Next, when the tank holding structure A of the present embodiment is provided, the side surface 1e of the tank 1 is appropriately corrected for unevenness, and after the ground treatment, the fixing member 3b is temporarily bonded to connect the plurality of connection means 3 to the tank 1. The FRP 2 is formed by disposing at a predetermined position on the side surface 1e and undercoating, winding the fiber sheet, and impregnating and bonding the fiber sheet. At this time, FRP2 may be formed by laminating a plurality of fiber sheets, and the fiber directions of the fiber sheets of each layer may be laminated in different desired directions.

  Also, finish coating is performed on the surface of FRP2. It is not always necessary to perform finish coating.

  Here, the FRP installation area (tank side fiber sheet adhesion range) M for adhering the fiber sheet to the side surface 1e of the tank 1 is not particularly limited. For example, elbow leg buckling, lantern buckling, diamond seat In consideration of the position of tank buckling that may occur when an external force such as an earthquake acts on the tank 1 such as bending, it is preferable to set the buckling occurrence predicted position to be reinforced. That is, it is preferable to set the installation area of the FRP 2 so that damage to the tank 1 due to an external force such as an earthquake can be suppressed / prevented.

  Then, one end side and the other end side of the wire of the cord-like body of the connecting means 5 are connected to the ground anchor of the fixing means 4 placed on 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 the present 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 the connecting means. 5 are connected by the cord-like bodies, it is possible to hold the tank 1 even if wave force or buoyancy acts on the tank 1 in the event of flood.

  At this time, the fixing member 3b of the connecting means 3 is fixed to the side surface 1e of the tank 1 by the FRP 2 formed by winding and sticking a fiber sheet around the tank 1, and thus acts on the connecting means 3. The external force can be transmitted to and supported by the FRP 2 not on the point but on the surface of the FRP 2 having a large area. Further, the FRP 2 can counter the wire tension not only by the adhesion force to the side surface 1e of the tank 1 but also by a circumferential force like a hoop. This makes it possible to hold the tank 1 more reliably when a large external force is applied to the tank 1.

  Therefore, according to the tank holding structure A of the present embodiment, it is installed in an area (such as a coastal area) where it can be immersed in water due to any flood damage, such as tsunami, storm surge, typhoon, heavy rain, dam or bank break, overflow Even when the tank 1 is immersed in water at the time of flooding, the tank 1 can be prevented from falling off the base 6 and drifting.

  Furthermore, in the tank holding structure A of the present embodiment, it is not necessary to use a firearm such as welding for the installation of the FRP 2, the connecting means 3, the fixing means 4, and the connecting means 5, so that a large number are provided in coastal areas such as fishing ports. The oil tank (or gas tank) that is used can be suitably employed.

  Furthermore, the tank 1 can be effectively reinforced by setting the installation range M of the FRP 2 so as to include at least the buckling occurrence predicted position of the tank 1, and the seating of the tank 1 when an earthquake or the like occurs. Bending 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 changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Tank 1a Body part 1b Cover part 1c Bottom plate part 1d Flange 1e Side surface 2 FRP (Fiber reinforced plastic, composite material of fiber sheet and resin material)
3 Connection means 3a Eyebolt (ring-shaped connection part)
3b Fixing member (fixing part)
4 Fixing means (ground anchor)
5 Connecting means (cord, wire)
6 Base A Tank holding structure O1 Axis M FRP installation area / range

Claims (3)

A structure for holding a tank installed in an area where it can be immersed in water in the event of a flood,
A fiber reinforced plastic which 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 disposed to be fixed to a side surface of the tank while providing the fiber-reinforced plastic so as to surround the tank;
Fixing means arranged to be fixed to the ground indirectly or directly;
A tank holding structure comprising: a connecting unit that connects the connecting unit and the fixing unit. The tank holding structure according to claim 1,
The connection means includes a ring-shaped connection portion and a substantially rectangular plate-shaped or substantially rod-shaped fixing portion connected to the connection portion,
The fiber reinforced plastic is provided so that the fixing portion arranged with the longitudinal direction facing the vertical direction surrounds the tank, and is sandwiched between the fiber reinforced plastic and the side surface of the tank and fixed to the side surface of the tank. A tank holding structure, wherein the tank is provided and the connection portion protrudes outside the side surface of the tank. In the holding structure of the tank according to claim 1 or 2,
An installation range of the fiber reinforced plastic is set so as to improve the buckling strength of the tank including at least a predicted buckling occurrence position of the tank.

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