JP7641932B2 - Liquid storage tank reinforcement structure and liquid storage tank reinforcement method - Google Patents

Description

The present invention relates to a liquid storage tank reinforcement structure that reinforces a liquid storage tank having a side wall portion, a ceiling portion, and a bottom portion, and a method for reinforcing a liquid storage tank.

Conventionally, liquid storage tanks have been known that have structural panels made of FRP or the like as their exterior walls, and these tanks can be damaged by cracks in the structural panels due to deterioration over time or shocks and vibrations caused by earthquakes, etc. Patent Document 1 proposes a method for repairing the structural panels of such liquid storage tanks by applying a specified primer to the inner surface of the liquid storage tank, followed by application of an instant-setting resin.

JP 2017-101527 A

According to the technology disclosed in the above-mentioned Patent Document 1, cracks and the like that occur in the structural plate can be repaired with an instant-hardening resin, thereby making it possible to prevent water leakage from the liquid storage tank.
However, in the technology disclosed in Patent Document 1, it is necessary to apply instant-curing resin to the inner surface of the liquid storage tank, and therefore it is necessary for workers to enter the inside of the liquid storage tank and carry out the instant-curing resin application work in a relatively narrow, nearly sealed condition. Considering the impact of the instant-curing resin being applied on the workers, it is difficult to say that safety is necessarily guaranteed.

In addition, during this work, the supply of liquid from the liquid storage tank had to be temporarily suspended. If the liquid storage tank was used to supply water for daily use to an apartment building or similar building, this caused great inconvenience to the residents. If the liquid storage tank was used to supply water for industrial use to a factory or similar building, the factory's operations had to be temporarily suspended, resulting in reduced productivity at the factory.

Furthermore, according to the technology disclosed in Patent Document 1, the structural plate is repaired by applying an instant-setting resin from inside the liquid storage tank. Therefore, if the liquid storage tank vibrates due to an earthquake or the like, causing the water inside to sway and impact the structural plate, cracking the structure. Even after repair, there is a risk that fragments of the structure will scatter to the outside, and there is room for improvement from a safety standpoint.

The present invention was made in consideration of the above-mentioned problems, and its purpose is to provide a liquid storage tank reinforcement structure and a liquid storage tank reinforcement method that can maintain a stable supply of water while ensuring the safety of workers during reinforcement work, prevent damage to the liquid storage tank and water leakage when vibrations such as earthquakes occur, and prevent the liquid storage tank structure from scattering outside.

The liquid storage tank reinforcing structure for achieving the above object comprises:
A liquid storage tank reinforcing structure for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion, the structure being characterized by the following features:
A reinforcing coating film of a polyurethane resin is provided which is adhered to the ceiling portion, the side wall portion, and the bottom portion and integrally covers the outer sides of the ceiling portion, the side wall portion, and the bottom portion ;
The edge of the molded plate-like body constituting the side wall portion is provided with a flange portion extending outward,
The edges of a pair of adjacent molded plate-like bodies among the molded plate-like bodies constituting the side wall portion are fixed in a manner in which they are sandwiched by a clamping member that clamps both of the opposing flange portions,
A caulking material is filled in a gap formed between the opposing flanges and the clamping members along a cross direction crossing the clamping direction,
The reinforcing coating film is formed by forming a coating film that covers the outside of the caulking material .

A method for reinforcing a liquid storage tank to achieve the above object includes the steps of:
A method for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion, the method comprising the steps of:
A flange portion is provided on the edge of the molded plate-like body constituting the side wall portion, and the edges of a pair of adjacent molded plate-like bodies among the molded plate-like bodies constituting the side wall portion are fixed in a manner in which they are sandwiched by a clamping member that clamps both of the opposing flange portions,
Filling a gap formed between the opposing flanges and the clamping members along a cross direction crossing the clamping direction with a caulking material;
A reinforcing coating film of a polyurethane resin is adhered to the ceiling portion, the side wall portion, and the bottom portion to integrally cover the outsides of the ceiling portion, the side wall portion, and the bottom portion;
The reinforcing coating film is formed to cover the outside of the caulking material .

According to the above-described characteristic configuration, a reinforcing coating of polyurethane resin that reinforces the liquid storage tank is applied in a form that integrally covers the outer sides of the ceiling, side wall, and bottom portions. Therefore, when applying the reinforcing coating to reinforce (repair) the liquid storage tank, there is no need for workers to work inside the liquid storage tank as in the conventional technology, and the safety of the workers can be ensured.
Furthermore, when carrying out reinforcement work to reinforce an existing liquid storage tank with a reinforcing coating film, the reinforcing coating film is simply applied to the outside of the ceiling, side walls, and bottom surface of the liquid storage tank, so that water can be supplied via the liquid storage tank even during the reinforcement work, thereby improving convenience for users of the water stored in the liquid storage tank.
Furthermore, according to the above characteristic configuration, the reinforcing coating of polyurethane resin that reinforces the liquid storage tank is applied in a form that integrally covers the outside of the ceiling, side wall, and bottom. Therefore, even if the side wall, ceiling, or bottom of the liquid storage tank is damaged due to direct vibration caused by an earthquake or the fluctuation of the liquid inside the liquid storage tank, the outer reinforcing coating can effectively prevent the damage from scattering to the outside, thereby preventing the occurrence of secondary disasters.
As a result of the above, it is possible to realize a liquid storage tank reinforcement structure and a liquid storage tank reinforcement method that can maintain a stable supply of water while ensuring the safety of workers during reinforcement work, prevent damage to the liquid storage tank and prevent water leaks in the event of vibrations such as earthquakes, and prevent the liquid storage tank structure from scattering to the outside.
Furthermore, in the case where the ceiling, sidewalls, and bottom of the liquid storage tank are formed using a plurality of molded plates, the edges of the molded plates constituting the sidewalls are provided with flanges extending outward, and the edges of the adjacent molded plates constituting the sidewalls are fixed in a manner that they are sandwiched between a clamping member that clamps both of the opposing flanges. In this configuration, a gap may be formed between the opposing flanges and the clamping member, and when such a gap is formed, there is a risk that the gap will not be covered by the reinforcing coating even if a polyurethane resin is applied as a reinforcing coating.
According to the above characteristic configuration, even if the liquid storage tank is configured as described above, the caulking material is filled in a manner that fills the gap formed between the opposing flange portion and the clamping member, and the reinforcing coating film forms a coating film that covers the outside of the caulking material, so that the outside of the liquid storage tank, including the gap portion, can be appropriately surrounded by the polyurethane resin reinforcing coating film, thereby achieving a more stable reinforcement structure.

Further characteristic configurations of the liquid storage tank reinforcing structure include:
The bottom surface portion and the lower end portion of the side wall portion are placed on a stand fixed to a foundation by anchor bolts,
The outer surface of the bottom portion is covered with the reinforcing coating film except for a portion that overlaps with the stand in a plan view.

According to the above characteristic configuration, the outer surface of the bottom part is also covered with a reinforcing coating film, except for the part that overlaps with the stand in a plan view, so that a liquid storage tank reinforcement structure can be realized that can sufficiently reduce the risk of damage to the bottom part and the rest of the tank, even if there is an external impact from shaking associated with earthquake motion.

The liquid storage tank reinforcing structure for achieving the above object comprises:
A liquid storage tank reinforcing structure for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion, the structure being characterized by the following features:
A reinforcing coating film of a polyurethane resin is provided which is adhered to the ceiling portion, the side wall portion, and the bottom portion and integrally covers the outer sides of the ceiling portion, the side wall portion, and the bottom portion;
The side wall portion is provided with a recessed opening portion that is recessed from the outside to the inside and has an opening at its bottom,
A tension tool is provided on the pair of opposing side wall portions to pull each other inward through the recessed opening portion to prevent outward bulging deformation,
The recessed opening is filled with a caulking material, and the reinforcing coating film forms a coating film that covers the outside of the caulking material.
A method for reinforcing a liquid storage tank to achieve the above object includes the steps of:
A method for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion, comprising the steps of:
Its characteristic configuration is:
In a configuration in which a recessed hole portion that is recessed from the outside to the inside and has an opening at the bottom thereof is provided in the side wall portion, and a pair of opposing side wall portions are provided with a pulling tool that pulls each other inward through the recessed hole portion to prevent outward bulging deformation,
Filling the recessed opening with a caulking material;
A reinforcing coating film of a polyurethane resin is adhered to the ceiling portion, the side wall portion, and the bottom portion to integrally cover the outsides of the ceiling portion, the side wall portion, and the bottom portion;
The reinforcing coating film is formed to cover the outside of the caulking material.

The liquid storage tank may have a configuration in which a recessed opening is provided in the side wall portion, which is recessed from the outside to the inside and has an opening at its bottom, and a pair of opposing side walls is provided with a pulling tool that pulls each other inward through the recessed opening to prevent outward bulging deformation. In this configuration, even if a polyurethane resin is applied as a reinforcing coating film to cover the outside, there is a risk that the recessed opening will not be covered by the reinforcing coating film.
According to the above characteristic configuration, even if the liquid storage tank is configured as described above, the caulking material is filled in a manner that fills the recessed opening, and the reinforcing coating film forms a coating film that covers the outside of the caulking material, so that the outside of the liquid storage tank, including the recessed opening, can be appropriately surrounded by the polyurethane resin reinforcing coating film, thereby achieving a more stable reinforcement structure.

1 is a schematic configuration diagram of a liquid storage tank to which a reinforcing structure according to an embodiment is applied; 2 is a cross-sectional view taken along line II-II of FIG. 1, and is an enlarged view showing a reinforcing structure at a joining portion of adjacent side wall portions of a liquid storage tank according to the embodiment. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, and is an enlarged view showing a reinforcing structure at a joint of a side wall portion at a corner of the liquid storage tank according to the embodiment. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, and is an enlarged view showing a reinforcing structure at a joint between a bottom surface portion and a side wall portion of the liquid storage tank according to the embodiment and a stand. 13 is an enlarged view showing a reinforcing structure at a location where a recessed opening is present in a side wall of a liquid storage tank according to another embodiment. FIG.

The liquid storage tank reinforcement structure and liquid storage tank reinforcement method according to an embodiment of the present invention are capable of maintaining a stable supply of water while ensuring the safety of workers during reinforcement work, preventing damage to the liquid storage tank and preventing water leakage in the event of vibrations such as earthquakes, and preventing the liquid storage tank structure from scattering to the outside.
Hereinafter, a liquid storage tank reinforcing structure and a liquid storage tank reinforcing method according to an embodiment will be described with reference to FIGS.

The liquid storage tank reinforcing structure and liquid storage tank reinforcing method according to this embodiment are a structure and method for integrally surrounding and covering the outside of a liquid storage tank 100 shown in FIG. 1 for storing liquid such as water.
As shown in FIG. 1, the liquid storage tank 100 is configured to have a ceiling portion 10, a side wall portion 20, and a bottom portion 30, which are deformable due to impact or vibration.
The bottom surface 30 and the lower flange 21b of the side wall 20 of the liquid storage tank 100 are placed on a plurality of racks 40 made of a metal such as stainless steel having excellent corrosion resistance, and the racks 40 are fixed to a concrete foundation D with anchor bolts AB (shown in Figure 4).

Although details will be described later, the ceiling portion 10, the side wall portion 20 and the bottom portion 30 are each constructed by connecting a plurality of molded plate-like bodies 11, 21, 31 made of FRP to one another.
A pair of side walls 20 opposing each other in one opposing direction (the direction along the arrow X in FIG. 1) are connected to each other at their upper sides in the vertical direction (the direction along the arrow Z) by a plurality of reinforcing members 50. A pair of side walls 20 opposing each other in the other opposing direction (the direction along the arrow Y in FIG. 1) are connected to each other at their upper sides in the vertical direction (the direction along the arrow Z) by one reinforcing member 51. This configuration prevents the liquid storage tank 100 from expanding upward.

A manhole 12 is provided in a part of the molded plate-like body 11 constituting the ceiling portion 10, and the manhole cover portion 12c is provided in a state in which it can be opened and closed relative to the manhole base portion 12b, and an operator can enter the inside of the liquid storage tank 100 through the manhole 12. Incidentally, a ladder 13 is provided on the side wall portion 20 of the liquid storage tank 100 for an operator to climb up to the top. When applying a reinforcing coating film PU (shown in FIG. 2, etc.) as a liquid storage tank reinforcing structure described later, the area between the manhole cover portion 12c and the manhole base portion 12b is masked. This allows the manhole cover portion 12c to be opened and closed even after the reinforcing coating film PU is applied.
Furthermore, the ceiling portion 10 is provided with an electrode mounting seat 14 for mounting an electrode, and also with an air vent (not shown).

The liquid storage tank reinforcing method according to this embodiment is a method of covering the liquid storage tank 100 with a bag-shaped reinforcing coating film PU in such a way that it integrally surrounds the outside of the liquid storage tank 100 .
In the liquid storage tank reinforcing method, first, a cleaning process is performed on the outside of the ceiling 10, sidewall 20, and bottom 30 of the liquid storage tank 100, on the FRP outer surface and on the outer surfaces of bolts and metal parts described later, to remove rust and peeling of paint film as a surface preparation. Next, a caulking process is performed on recesses and the like formed on the outside of the ceiling 10, sidewall 20, and bottom 30. Next, a primer process is performed on the outside of the ceiling 10, sidewall 20, and bottom 30, on the parts made of FRP, by applying a primer P, Swaal (B55M: manufactured by Mitsui Chemical Industrial Products, Inc.), and a primer process is performed on the metal parts, such as stainless steel plated with zinc or the like, by applying a thick-film rust inhibitor (Carbomastic 15: manufactured by Japan Carboline Co., Ltd.) or Swaal (E-1020: manufactured by Mitsui Chemical Industrial Products, Inc.). Next, a reinforcing coating application process is carried out in which a reinforcing coating PU of polyurethane resin is applied to the outside of the ceiling portion 10, the side wall portion 20, and the bottom portion 30 in a thickness of approximately 1.5 mm to 3.0 mm by spraying while mixing two liquids of isocyanate and an amine-based hardener under high pressure collision.
Finally, as a finishing treatment, a solvent-based acrylic urethane protective finishing material (CR Top: AGC Polymer Building Materials Co., Ltd.) or a highly weather-resistant protective finishing material (Siloxane Ace: Japan Carboline Corporation) is applied.
According to the above-mentioned liquid storage tank reinforcement method, the reinforcing coating film PU of polyurethane resin is adhered to the ceiling portion 10, the side wall portion 20, and the bottom portion 30, thereby integrally covering the outsides of the ceiling portion 10, the side wall portion 20, and the bottom portion 30.

In this regard, the polyurea resin used as the reinforcing coating PU preferably has a tensile strength (N/ ^mm2 ) of 13 N/ ^mm2 (at 140°C) or more and 36 N/ ^mm2 (at -20°C) or less in the temperature range of -20°C or more and 140°C or less when the thickness is 2 mm and the pulling speed is 200 mm/min.

Next, the liquid storage tank reinforcing structure at each portion of the liquid storage tank 100 will be described in detail.
In the following description, in order to clearly illustrate the characteristic features of the invention, a reinforcement structure will be described in a state in which the above-mentioned primer treatment and reinforcing coating film application treatment have been carried out.
As shown in Figure 2, which is a cross-sectional view taken along line II-II of Figure 1, in the assembled state of the molded plate-like bodies 11, 21, 31 constituting the ceiling portion 10, side wall portion 20, and bottom portion 30 of the liquid storage tank 100, the edge of the molded plate-like body 21 constituting the side wall portion 20 is provided with a flange portion 21a extending outward, and the edges of adjacent molded plate-like bodies 21 are fixed in a manner in which they are clamped by a clamping member 22 that clamps both of a pair of opposing flange portions 21a. To add a further explanation, the clamping member 22 is composed of an elongated one-side clamping member 22a and an other-side clamping member 22b extending in the vertical direction (the direction along the arrow Z in FIG. 2) of the side wall portion 20, and the clamping member 22 is fastened and fixed by a first bolt B1 and a first nut N1 in a state in which the one-side base end portion 22ax of the one-side clamping member 22a and the other-side base end portion 22bx of the other-side clamping member 22b are positioned to sandwich a pair of flange portions 21a. Furthermore, the clamping member 22 is fastened and fixed by a second bolt B2 and a second nut N2 in a state in which the one-side tip portion 22ay of the one-side clamping member 22a and the other-side tip portion 22by of the other-side clamping member 22b are in contact with each other.
In addition, a seal member S for maintaining watertightness is disposed between the pair of flange portions 21a.

In the above configuration, a gap KG1 is formed between the opposing flanges 21a and the clamping member 22 along a cross direction (arrow Z direction in FIG. 2) that crosses the clamping direction, and in this embodiment, the gap KG1 is filled with caulking material Co, and the reinforcing coating film PU is applied in a manner that covers the outside of the caulking material Co. That is, the caulking material Co is filled from an opening formed at one end or the other end of the gap KG1 in the cross direction.
Incidentally, the caulking material Co is also applied to the periphery of the uneven portions around the first bolt B1, the first nut N1, the second bolt B2, and the second nut N2.
To provide further explanation, as described above, the liquid storage tank reinforcement structure is formed by filling the gap KG1 with caulking material Co and applying it around the uneven parts surrounding the first bolt B1, the first nut N1, the second bolt B2, and the second nut N2, applying a primer P to the outside of the gap KG1, and applying a reinforcing coating film PU to the outside of the primer P.

As another portion, as shown in Figure 3, which is a cross-sectional view of III-III in Figure 1, in a portion where the molded plate-like bodies 21 constituting the side wall portion 20 are adjacent to each other at a right angle (the corner portion of the fluid storage portion in a plan view), the flange portions 21a of a pair of molded plate-like bodies 21 are fixed by a first L-shaped metal fitting K1.
To further explain, one of the pair of flanges 21a is fastened to one end surface portion K1a of the first L-shaped metal K1 by a fourth bolt B4 and a fourth nut N4, and the other of the pair of flanges 21a is fastened to the other end surface portion K1b of the first L-shaped metal K1 by a third bolt B3 and a third nut N3. In addition, a seal member S is provided between the flanges 21a of the pair of molded plate bodies 21 and the first L-shaped metal K1 to ensure watertightness.
In the above configuration, the liquid storage tank reinforcement structure has caulking material Co applied around the uneven parts around the third bolt B3, the third nut N3, the fourth bolt B4, and the fourth nut N4, and then has primer P applied to the outside of that, and then has reinforcing coating film PU applied to the outside of that.

As for other parts, the outer surface of the bottom portion 30 is covered with a reinforcing coating film PU, except for a portion (not shown) that overlaps with the stand 40 in a plan view.
To provide further explanation, as shown in Figure 4, which is a cross-sectional view taken along line IV-IV of Figure 1, one end face 40b of a U-shaped stand 40 is fastened to a concrete foundation D with an anchor bolt AB, and the liquid storage tank 100 is placed from above, with the flange portion 31a of the molded plate-like body 31 constituting the bottom portion 30 and the lower flange portion 21b (an example of a lower end portion) of the molded plate-like body 21 constituting the side wall portion 20 placed against the other end face 40a of the stand 40.
More specifically, the flat portion 21d of the molded plate-like body 21 constituting the side wall portion 20, the flange portion 31a provided on the edge of the molded plate-like body 31 constituting the bottom portion 30, and one end surface portion K2b of the second L-shaped metal fitting K2 are arranged in order from the outside and fastened together by a fifth bolt B5 and a fifth nut N5, the other end surface portion K2a of the second L-shaped metal fitting K2 and one end surface portion K3a of the third L-shaped metal fitting K3 are fastened together by a sixth bolt B6 and a sixth nut N6, and the one end surface portion K3b of the third L-shaped metal fitting K3 abuts against the flat surface 40c between one end surface 40b and the other end surface 40a of the frame 40. In addition, a seal member S is disposed between the flange portion 31a of the molded plate-like body 31 constituting the bottom portion 30 and the molded plate-like body 21 constituting the side wall portion 20 to ensure watertightness.
In the above configuration, the liquid storage tank reinforcement structure is configured such that caulking material Co is applied around the uneven parts around the fifth bolt B5, the fifth nut N5, the sixth bolt B6, the sixth nut N6, and the anchor bolt AB, primer P is applied to the outside of that, and reinforcing coating film PU is applied to the outside of that.
In other words, except for the portion where one end surface 40b of the frame 40 abuts against the concrete foundation D, the outside of the liquid storage tank 100 is integrally covered with the reinforcing coating film PU.

[Another embodiment]
(1) In the above embodiment, the liquid storage tank reinforcing method includes an example in which a scraping cleaning process, a primer process, and a finishing process are performed. However, these processes do not necessarily have to be performed, and the content of the processes may be changed.

(2) It is preferable that the caulking material Co be applied to the recesses on the outside of the liquid storage tank 100 in addition to the areas described in the above embodiment.
For example, as shown in FIG. 5, the liquid storage tank 100 may be configured such that the side wall portion 20 is provided with a recessed opening portion OK that is recessed from the outside to the inside and has an opening 21c at its bottom, and a pair of opposing side wall portions 20 are provided with pulling jigs that pull each other inward through the recessed opening portion OK to prevent outward bulging deformation.
To further explain the configuration of the tensile jig, it is composed of a contact member Ha that, in one side wall portion 20, abuts from the outside toward the side wall portion 20 against the reinforcing column H extending along the side wall portion 20 on the outside of the side wall portion 20, a first lock bolt SJ1 that penetrates the flange portion Ha1 of the abutment member Ha and is inserted into the recessed opening portion OK, a lock nut RN that can be screwed into the first lock bolt SJ1 near the screw head SJ1b of the first lock bolt SJ1 and is located outside the recessed opening portion OK, and a washer W and a gasket Pa that are provided between the lock nut RN and the recessed opening portion OK.
By tightening a common nut TU that screws onto both the tip male screw portion ON2 of the first lock bolt SJ1 on one side wall portion 20 and the tip male screw portion ON4 of the second lock bolt SJ2 on the other side wall portion 20, the one side wall portion 20 and the other side wall portion 20 are pressed from the outside to the inside via the reinforcing pillar H. By tightening the lock nut RN in this state, the watertightness of the opening 21c of the recessed opening portion OK is ensured.
In this configuration, the liquid storage tank reinforcement structure is formed by applying the caulking material Co to the recessed openings OK from the outside, applying the primer P to the outside of the caulking material Co, and applying the reinforcing coating film PU to the outside of the primer P. Incidentally, the reinforcing columns H are also subjected to the primer treatment and the reinforcing coating film application treatment.
In this embodiment, the caulking material Co is not applied to the portions having uneven shapes such as the screw head SJ1b of the first lock bolt SJ1, but it may be applied thereto.

(3) In the above embodiment, the molded plate-like bodies 11, 21, 31 are made of FRP, but they may be made of other materials.
In the above embodiment, the molded plate-like bodies 11, 21, and 31 are in the shape of a flat plate having a flange on the edge.
However, the molded plate-like bodies 11, 21, 31 may have various shapes. For example, the flat plate-shaped portions may have a shape that bulges inward or outward in the center when assembled into the liquid storage tank 100.

The configurations disclosed in the above embodiment (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, provided no contradictions arise. Furthermore, the embodiments disclosed in this specification are merely examples, and the present invention is not limited to these embodiments. Appropriate modifications can be made without departing from the scope of the present invention.

The liquid storage tank reinforcement structure and liquid storage tank reinforcement method of the present invention can maintain a stable supply of water while ensuring the safety of workers during reinforcement work, and can be effectively used as a liquid storage tank reinforcement structure and liquid storage tank reinforcement method that can prevent damage to the liquid storage tank and prevent water leakage when vibrations such as earthquakes occur, as well as prevent the liquid storage tank structure from scattering outside.

Reference Signs List 10: Ceiling 11: Molded plate 20: Side wall 21: Molded plate 21a: Flange 21c: Opening 22: Clamping member 30: Bottom 31: Molded plate 40: Stand 100: Liquid storage tank AB: Anchor bolt Co: Caulking material KG1: Gap PU: Reinforcing coating

Claims (5)

A liquid storage tank reinforcement structure for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion,
A reinforcing coating film of a polyurethane resin is provided which is adhered to the ceiling portion, the side wall portion, and the bottom portion and integrally covers the outer sides of the ceiling portion, the side wall portion, and the bottom portion ;
The edge of the molded plate-like body constituting the side wall portion is provided with a flange portion extending outward,
The edges of a pair of adjacent molded plate-like bodies among the molded plate-like bodies constituting the side wall portion are fixed in a manner in which they are sandwiched by a clamping member that clamps both of the opposing flange portions,
A caulking material is filled in a gap formed between the opposing flanges and the clamping members along a cross direction crossing the clamping direction,
The reinforcing coating film is a liquid storage tank reinforcing structure that forms a coating film to cover the outside of the caulking material . A liquid storage tank reinforcement structure for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion,
A reinforcing coating film of a polyurethane resin is provided which is adhered to the ceiling portion, the side wall portion, and the bottom portion and integrally covers the outer sides of the ceiling portion, the side wall portion, and the bottom portion;
The side wall portion is provided with a recessed opening portion that is recessed from the outside to the inside and has an opening at its bottom,
A tension jig is provided on the pair of opposing side wall portions to pull each other inward through the recessed opening portion to prevent outward bulging deformation,
A liquid storage tank reinforcing structure in which the recessed opening is filled with a caulking material, and the reinforcing coating film forms a coating film that covers the outside of the caulking material . The bottom surface portion and the lower end portion of the side wall portion are placed on a stand fixed to a foundation by anchor bolts,
The liquid storage tank reinforcement structure according to claim 1 or 2 , wherein an outer surface of the bottom portion is covered with the reinforcing coating film except for a portion that overlaps with the stand in a plan view. A method for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion, comprising the steps of:
A flange portion extending outward is provided on the edge of the molded plate-like body constituting the side wall portion, and the edges of a pair of adjacent molded plate-like bodies among the molded plate-like bodies constituting the side wall portion are fixed in a manner in which they are clamped by a clamping member that clamps both of the opposing flange portions,
Filling a gap formed between the opposing flanges and the clamping members along a cross direction crossing the clamping direction with a caulking material;
A reinforcing coating film of a polyurethane resin is adhered to the ceiling portion, the side wall portion, and the bottom portion to integrally cover the outsides of the ceiling portion, the side wall portion, and the bottom portion;
A method for reinforcing a liquid storage tank, comprising forming the reinforcing coating film to cover the outside of the caulking material. A method for reinforcing a liquid storage tank having a ceiling portion, a side wall portion, and a bottom portion, comprising the steps of:
In a configuration in which a recessed hole portion that is recessed from the outside to the inside and has an opening at the bottom thereof is provided in the side wall portion, and a pair of opposing side wall portions are provided with a pulling tool that pulls each other inward through the recessed hole portion to prevent outward bulging deformation,
Filling the recessed opening with a caulking material;
A reinforcing coating film of a polyurethane resin is adhered to the ceiling portion, the side wall portion, and the bottom portion to integrally cover the outsides of the ceiling portion, the side wall portion, and the bottom portion;
A method for reinforcing a liquid storage tank , comprising forming the reinforcing coating film to cover the outside of the caulking material .

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