Leak prevention method and leak prevention structure

Abstract

To effectively prevent outflow of a leaked object from a dike with a simple step.SOLUTION: In a method of preventing leakage of a liquid 4 from a dike 2, a liquid prevention sheet 30 which can prevent dispersion of a liquid is fixed at the upper part of the dike 2 by a fixing tool 50, at least a damaged region 8 of the dike 2 is covered from the upper part to the lower part of an outer wall surface 22 of the dike 2, and at a storage body 90 which is connected to the fixing tool 50 at the upper part of the dike 2 and provided at the surface 6 or in the neighborhood of the surface 6 so as to come into contact with the outer wall surface 22 or approach it, a plurality of mass bodies 70 are stored and stacked so as to lean against the outer wall surface 22 of the dike 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a leak prevention method and structure. [Background technology]

[0002] A dike (oil dike, etc.) may be installed around a tank that stores liquids such as petroleum or liquid hazardous materials. The dike is installed to prevent the contents of the tank from leaking out if the tank is damaged for some reason and the contents of the tank leak.

[0003] However, if both the tank and the dike are damaged by an unexpected earthquake or other disaster, the contents of the tank, which are liquids or liquid-like substances (hereinafter simply referred to as liquids), such as oil, may pass through the dike and flow onto the premises outside the dike. If the leaked liquid spreads in this way, it could have an impact on the environment, so immediate measures are required to prevent the liquid from leaking from the damaged part of the dike.

[0004] In this regard, Patent Document 1 discloses a sandbag that can be used as a simple oil barrier to prevent the spread of leaked or spilled oil, which comprises a bag body equipped with an oil-water separator that has hydrophilic and oil-repellent properties, and a weight filled inside the bag body, wherein the bag body is made of a material that has a flow path that allows at least water to pass through, and the oil-water separator contains a fluorine-based compound that has an oil-repellent group and a hydrophilic group. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-65440 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, depending on the scale and urgency of the disaster, a large number of sandbags may be required, placing a significant burden on workers who repeatedly stack sandbags. Furthermore, workers performing such response work may need to work while wearing protective clothing or breathing apparatus, making it difficult to act quickly. Furthermore, after stacking sandbags, responding to secondary disasters and cleaning up afterward also require considerable effort.

[0007] The present invention has been made in consideration of this background, and its purpose is to provide a leakage prevention method and leakage prevention structure that can effectively prevent liquid from leaking from a liquid barrier using a simple process. [Means for solving the problem]

[0008] One aspect of the present invention for achieving the above-mentioned object is a method for preventing liquid leakage from a liquid barrier, which comprises fixing a liquid barrier sheet capable of preventing the liquid from scattering to the top of the liquid barrier with a fixing device, covering at least the damaged area of ​​the liquid barrier from the top to the bottom of the outer wall surface of the liquid barrier, and storing and stacking a plurality of mass bodies in a container connected to the fixing device at the top of the liquid barrier and installed on or near the ground surface so as to be in contact with or close to the outer wall surface, and leaning them against the outer wall surface of the liquid barrier.

[0009] In this way, by providing a liquid-proof sheet on the outer wall surface of the liquid barrier, it is possible to prevent the liquid (leaked contents) from scattering, making it easier for workers to perform leak prevention work. Also, by stacking the mass bodies so that they lean against the outer wall surface of the liquid barrier, the weight of the mass bodies can prevent the liquid (contents) from leaking. In addition, because the mass bodies are contained in a container, even if the outer wall surface is damaged or the contents have scattered, or the reachable area of ​​the contents 4 (the damaged area of ​​the outer wall surface and, in some cases, the splash area of ​​the outer wall surface that requires splash prevention measures) is wide and a large number of mass bodies 70 must be provided, the mass bodies can be concentrated and efficiently placed in the reachable area.

[0010] As described above, the method for preventing liquid leakage according to the present invention can effectively prevent liquid from leaking out of the liquid barrier with a simple process.

[0011] Furthermore, one aspect of the present invention for achieving the aforementioned object is to provide the method in which the container is hung on the side of the outer wall surface of the liquid barrier by hanging it via a compressible elastic body provided on the fixing device, and the container is lowered by accommodating the mass body in the hung container.

[0012] As a result, as the number of masses contained increases, the masses gradually lower and spread out over the ground, gradually covering the damaged and splashed areas. In this way, masses can be efficiently positioned.

[0013] Furthermore, one aspect of the present invention for achieving the above-mentioned object is to identify the liquid-reachable area of ​​the liquid-proof sheet based on the surface condition of the liquid-proof sheet, and to contain the mass body in the container to a height where the liquid-reachable area on the surface of the liquid-proof sheet is hidden by the mass body.

[0014] In this way, by setting the height of the mass bodies to the reachable area of ​​the contents (damaged area and splash area) determined by the surface condition of the liquid-proof sheet as the target, leakage of the contents can be effectively prevented. In addition, in this case, the height to which the mass bodies should be stacked can be easily determined by checking the surface condition of the liquid-proof sheet.

[0015] Furthermore, one aspect of the present invention for achieving the above-mentioned object is that, in the above-mentioned method, the fixing device comprises a first pressing member that presses one side of the liquid-proof sheet from the side of the outer wall surface of the liquid-proof dike to fix it to the upper part of the outer wall surface, and a second pressing member that presses the other side of the liquid-proof sheet from the side of the inner wall surface of the liquid-proof dike via the liquid-proof dike.

[0016] In this way, by configuring the sheet fixing device to sandwich the liquid barrier from both sides, the liquid barrier sheet can be reliably fixed to the liquid barrier.

[0017] Furthermore, one aspect of the present invention for achieving the above-mentioned object is a leakage prevention structure for preventing liquid from leaking from a liquid barrier, comprising: a liquid barrier sheet capable of preventing the liquid from scattering; a fixing device for fixing the liquid barrier sheet to the top of the liquid barrier so as to cover at least the damaged area of ​​the liquid barrier; and a container connected to the fixing device on the top of the liquid barrier and containing multiple mass bodies so as to lean against the outer wall surface of the liquid barrier, thereby being provided on or near the ground surface so as to be in contact with or close to the outer wall surface.

[0018] Furthermore, one aspect of the present invention for achieving the aforementioned object is that, in the structure, the container is suspended via a compressible elastic body provided on the fixing device, and is provided on the side of the outer wall surface of the liquid barrier, and the mass body is contained in the suspended container, causing the container to descend.

[0019] Furthermore, one aspect of the present invention for achieving the above-mentioned object is that, in the structure, the reachable area of ​​the liquid-proof sheet is specified based on the surface condition of the liquid-proof sheet, and the mass body is contained in the container to a height where the reachable area on the surface of the liquid-proof sheet is hidden by the mass body.

[0020] Furthermore, one aspect of the present invention for achieving the above-mentioned object is that, in the structure, the fixing device comprises a first pressing member that presses one side of the liquid-proof sheet from the side of the outer wall surface of the liquid-proof dike to fix it to the upper part of the outer wall surface, and a second pressing member that presses the other side of the liquid-proof sheet from the side of the inner wall surface of the liquid-proof dike via the liquid-proof dike. [Effects of the Invention]

[0021] According to the present invention, the outflow of liquid from the liquid barrier can be effectively prevented by a simple process. [Brief explanation of the drawings]

[0022] [Figure 1] 1A and 1B are diagrams illustrating an outline of a leak prevention structure constructed by a leak prevention method according to an embodiment of the present invention. [Figure 2] FIG. 10 is a cross-sectional view of a flood barrier with a sheet fastener attached to the damaged area. [Figure 3] FIG. 2 is a perspective view illustrating a detailed structure of the seat fixing device. [Figure 4] FIG. 10 is a diagram showing an example of a combination of materials and dimensions (or weights) of each member relating to a leak prevention structure. [Figure 5] 1 is a flow chart illustrating an example of a procedure for installing the leak prevention structure 10 (a leak prevention method). [Figure 6] FIG. 10 is a cross-sectional view of the liquid barrier 2, illustrating an example of a process for attaching a sheet fixing tool. [Figure 7] 10A and 10B are diagrams comparing stacking methods of mass bodies according to a conventional leakage prevention method and the leakage prevention method according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a diagram illustrating an outline of a leak prevention structure constructed by the leak prevention method according to this embodiment. As shown in the figure, the leak prevention method according to this embodiment is applied to a liquid retaining wall 2. The liquid retaining wall 2 is installed in, for example, a storage facility for hazardous materials, and surrounds a tank 3 containing predetermined contents.

[0024] Tank 3 contains, for example, a liquid or a fluid liquid substance such as petroleum or a chemical, but may contain other types of liquid or liquid substance (in this specification, these liquids or liquid substances contained in tank 3 are collectively referred to as "liquid"). The shape of tank 3 is not particularly limited, and the material of tank 3 is also not particularly limited as long as it is a material, such as steel, that can contain the contents.

[0025] The dike 2 is made of materials such as cast steel, earth, or concrete. The dike 2 is a wall-like structure arranged to surround the tank 3. Even if the tank 3 develops a crack or the like and the contents 4 leak, the dike 2 serves to block the contents 4 and prevent the contents 4 from reaching the outside of the dike 2.

[0026] However, there remains a risk that an unexpected event, such as a major disaster or accident, could cause cracks or damage to not only the tank 3 but also the dike 2. In such a case, the contents 4 of the tank 3 that leak from the tank 3 and reach the dike 2 may enter the crack or damage in the dike 2. If this is left unchecked, the contents 4 may leak from the inner wall surface 21 of the dike 2 to the outer wall surface 22, and further spread to the area outside the dike 2.

[0027] Therefore, the liquid barrier 2 of this embodiment is provided with a leakage prevention structure 10 to prevent the contents 4 from leaking out through cracks or broken parts of the liquid barrier 2. This leakage prevention structure 10 will be described below.

[0028] <Leakage prevention structure> As shown in FIG. 1, the leak prevention structure 10 includes a liquid-proof sheet 30, a sheet fixing member 50, and a housing body 90 in which a mass body 70 is housed.

[0029] The liquid-proof sheet 30 broadly covers the outer wall surface 22 of the liquid barrier 2, including the area where cracks or breakage have occurred or are likely to occur (hereinafter referred to as the damaged area). The liquid-proof sheet 30 also covers the area around the damaged area where splashes of the contents 4 leaking from the tank 3 are likely to splash (reach) (hereinafter referred to as the splash area). In the example shown in the figure, the liquid-proof sheet 30 is a rectangular sheet that covers the entire outer wall surface 22 of the liquid barrier 2 from the bottom to the top, including the damaged area 8 (located in the area where the mass bodies 70 are stacked) found at the bottom of the outer wall surface 22. The liquid-proof sheet 30 is made of a material that not only prevents leakage of the contents 4 leaking from the outer wall surface 21 of the tank 3 but also catches splashes of the contents 4 to prevent the contents 4 from splashing, such as a waterproof resin material such as urethane foam.

[0030] The upper part of the liquid-proof sheet 30 is fixed by one or more sheet fixing devices 50. The sheet fixing devices 50 include hook members 51 (first pressing members) that press the liquid-proof sheet 30 from the side of the outer wall surface 22 of the liquid barrier 2 (the outside of the liquid barrier 2) to fix it to the upper part of the outer wall surface 22, and second pressing members (holding frames 52 and inner wall surface pressing members 53) that press the liquid-proof sheet 30 from the side of the inner wall surface 22 of the liquid barrier 2 (the inside of the liquid barrier 2, i.e., the tank 3 side) via the liquid barrier 2. In other words, the sheet fixing devices 50 are attached from both the outside and inside of the liquid barrier 2 so as to sandwich the liquid barrier 2 therebetween. As a result, the upper part of the liquid-proof sheet 30 is pressed on both sides by the outer wall surface 22 and the sheet fixing devices 50 on the side of the outer wall surface 22, and is fixed to the outer wall surface 22.

[0031] As will be described later, the liquid-proof sheet 30 may be fixed not only by such a sheet fixing device 50, but also by an adhesive provided between the outer wall surface 22 and the liquid-proof sheet 30, or by an adhesive provided between the liquid-proof sheet 30 and the hook member 51.

[0032] 1, two sheet fasteners 50 are attached to both the left and right ends of the upper part of the liquidproof sheet 30, but the number of sheet fasteners 50 to be attached and their attachment positions on the upper part are not particularly limited. Details of the sheet fasteners 50 will be described later.

[0033] Next, a container 90 containing one or more mass bodies 70 is suspended via a compressible elastic body 60 from the end of a hook member 51 located on the outer wall surface 22 side of the sheet fixing device 50 fixed to the liquid barrier 2. The number of mass bodies 70 contained in the container 90 can be increased or decreased as appropriate.

[0034] The structure and shape of the container 90 are not particularly limited as long as it can contain the mass body 70, but a mesh bag, for example, is preferable for ease of handling.

[0035] The mass bodies 70 contained in the container 90 are stacked so as to lean against the outer wall surface 22 of the dike 2. The mass bodies 70 are not particularly limited as long as they are a member having a density sufficient to press against the outer wall surface 22 of the dike 2 (specifically, the damaged area and splash area) with their own weight while preventing the advance of the leaked material (contents 4 of the tank 3), but are, for example, sandbags that contain materials such as sand, soil, clay, or cement. Furthermore, if the contents of the tank 3 are an acidic solution, the mass bodies 70 may contain a neutralizing agent that neutralizes the contents.

[0036] Next, the leak prevention structure 10 will be described in detail. FIG. 2 is a cross-sectional view of the dike 2 with a sheet fastener 50 attached to the damaged area 8.

[0037] The sheet fixing device 50 is composed of a hook member 51 that presses the liquid-proof sheet 30 from the outside (outer wall surface 22 side) at the top of the liquid barrier 2, a gripping frame 52 that is connected to the hook member 51 and extends downward toward the inside (inner wall surface 21 side) of the liquid barrier 2, and an inner wall surface pressing member 53 that is connected to the gripping frame 52 and adheres to the inner wall surface 21 of the liquid barrier 2.

[0038] The hook member 51 and the gripping frame 52 are rotatably connected to each other by a first rotation mechanism 54 constituted by an axial member or the like that passes through both of them. Similarly, the gripping frame 52 and the inner wall surface pressing member 53 are rotatably connected to each other by a second rotation mechanism 55 constituted by an axial member or the like that passes through both of them. Note that the rotation angle between the hook member 51 and the gripping frame 52 by the first rotation mechanism 54 is limited to a certain angle by the compressive force of a compression elastic body 57 (for example, a tension spring) that connects the hook member 51 and the gripping frame 52.

[0039] Next, the container 90 containing the mass body 70 is suspended from the hook member 51 via the compression elastic body 60. Specifically, the compression elastic body 60 is suspended from the hook member 51 by hooking a hook 61 provided at one end of the compression elastic body 60 into a hooking hole 56 provided at an end of the outer wall surface 22 of the sheet fixing device 50, and the container 90 is suspended from the compression elastic body 60 by hooking a hook 62 provided at the other end of the compression elastic body 60 into a hooking hole 92 provided at the top of the container 90.

[0040] The compressible elastic body 60 is, for example, a tension spring, and exerts a compressive force in the opposite direction (upward) against the load of the mass body 70 housed in the housing body 90. The height of the compressible elastic body 60, the height of the housing body 90, and the dimensions of the hook member 51 (particularly the first extension portion 511) are adjusted so that the bottom surface of the housing body 90 is in partial or no contact with the ground surface 6 when the mass body 70 is not housed in the housing body 90 (in FIG. 2, the mass body 70 is housed in the housing body 90, and therefore the bottom surface of the housing body 90 is in wide contact with the ground surface 6).

[0041] The container 90 has an opening 91, and a worker can place the mass 70 in this opening 91. The worker places the mass 70 in the container 90 and stacks the mass 70 to a height that will prevent the contents 4 from leaking through the dike 2 (details will be described later). This prevents the contents 4 that have leaked from the tank 3 from leaking out through the outer wall surface 22.

[0042] <Seat fixing device> 3 is a perspective view illustrating the detailed structure of the sheet fixing device 50. As shown in the figure, the hook member 51 of the sheet fixing device 50 is an L-shaped member. The hook member 51 comprises a first extension portion 511 that forms one extension portion of the L shape and has a hooking hole 56 at its tip for hanging the compressible elastic body 60, and a second extension portion 512 that forms the other extension portion of the L shape and has a shaft hole (not shown) formed near the tip in the extension direction through which a shaft member 541 that forms the first rotation mechanism 54 is inserted.

[0043] The gripping frame 52 is an L-shaped member and has a third extension portion 521 which forms the longer extension portion of the L shape and has a gripping portion 523 formed at its tip in the extension direction, the gripping portion 523 having unevenness or an anti-slip material, etc., and a fourth extension portion 522 which forms the shorter extension portion of the L shape and has its tip connected to the inner wall surface pressing member 53.

[0044] The third extension portion 521 is provided at its midpoint in the extension direction with a shaft hole (not shown) through which the shaft member 541 is inserted. The shaft member 541 passes through this shaft hole and the shaft hole of the hook member 51. This allows the gripping frame 52 to rotate relative to the hook member 51 with the shaft member 541 as the rotation axis. Furthermore, the shaft member 541 is provided with a predetermined fastening mechanism (not shown), and an operator can stop the rotational movement between the hook member 51 and the gripping frame 52 by rotating a knob 542.

[0045] At the tip of the fourth extension 522 of the gripping frame 52, a shaft hole (not shown) is formed, through which a shaft member 551 constituting the second rotation mechanism 55 is inserted.

[0046] Next, the inner wall surface pressing member 53 is a member in the shape of a cone (for example, a circular cone or a pyramid) or a frustum (for example, a frustum of a pyramid or a truncated cone), and has an axial hole (not shown) formed on the apex (top surface) side thereof, and an axial member 551 passes through this axial hole and the axial hole of the fourth extension part 522 of the holding frame 52. This allows the holding frame 52 to rotate relative to the holding frame 52 with the axial member 551 as the rotation axis.

[0047] Meanwhile, a buffer material 531 having a surface that can come into close contact with the inner wall surface 21 of the liquid barrier 2 is provided at the bottom of the inner wall surface pressing member 53. The buffer material 531 is an elastic material such as rubber or sponge, for example.

[0048] In addition, a protrusion 524 is provided near the tip of the fourth extension portion 522 of the gripping frame 52 to regulate rotation by the second rotation mechanism 55, so that even if the angle between the hook member 51 and the gripping frame 52 changes due to rotation of the gripping frame 22, the surface of the cushioning material 531 and the surface 513 of the first extension portion 511 of the hook member 51 (inner wall surface 22 of the liquid barrier 2) can be maintained so as to be roughly opposite each other.

[0049] <Examples of materials and dimensions for each component> FIG. 4 shows an example of a combination of materials and dimensions (or weights) of each component of the leak prevention structure. As shown in the figure, in this example, the material of the sheet fixture 50 (hook members 51 and gripping frame 52) is SUS (stainless steel). The material and size of the liquidproof sheet 30 are urethane foam and 1000 mm square and 5 mm thick. The material of the compression elastic body 60 (tension spring) suspended from the sheet fixture 50 is SUS (stainless steel). The material and dimensions of the net serving as the container 90 are nylon and 1500 mm x 1000 mm. The material and weight of the sandbags serving as the mass body 70 are sand and 10 kg (each). Next, a method for attaching the leakage prevention structure 10 to the liquid barrier 2 will be described.

[0050] <Leakage prevention method> FIG. 5 is a flow chart illustrating an example of the procedure for installing the leak prevention structure 10 (leak prevention method).

[0051] First, the damaged area 8 on the outer wall surface 22 of the liquid barrier 2 is identified, and a rectangular liquid barrier sheet 30 that completely covers the damaged area 8 is temporarily attached to the outer wall surface 22 of the liquid barrier (s1).

[0052] For example, a worker prepares a rectangular liquid-proof sheet 30 with one side (width) longer than the horizontal (width direction) length of the damaged area 8 and the other side (height) longer than the vertical (height direction) length of the damaged area 8. The worker then applies adhesive to one widthwise side of the liquid-proof sheet 30 and presses the adhesive-coated liquid-proof sheet 30 against the outer wall surface 22 of the liquid barrier 2 so that the adhesive-coated area corresponds to the upper end of the outer wall surface 22 of the liquid barrier 2. This adheres the liquid-proof sheet 30 to the outer wall surface 22 of the liquid barrier 2. Note that instead of adhesive, other fixing devices may be used. For example, clips or the like may be used to fix the liquid-proof sheet 30 by clamping the upper part of the liquid barrier 2 between the outer wall surface 22 and the inner wall surface 21.

[0053] Next, the sheet fixing tool 50 is attached to the liquid barrier 2 to fix the liquid barrier sheet 30 (s3).

[0054] 6 is a cross-sectional view of the liquid barrier 2 illustrating an example of the process of attaching the sheet fixture 50. As shown in the figure, a worker positions the hook member 51 of the sheet fixture 50 on the outside of the liquid barrier 2 from above the liquid barrier 2, straddling the liquid barrier 2 and hooking it onto a corner of the top surface of the liquid barrier 2. That is, the worker applies adhesive 32 in advance to the surface of the liquid-proof sheet 30 that comes into contact with the first extension 511 of the hook member 51, and then presses the hook member 51 against the liquid-proof sheet 30 so that the surface of the first extension 511 faces the outer wall surface 22 of the liquid barrier 2, thereby bonding the liquid-proof sheet 30 to the surface 513 of the hook member 51 (first extension 511).

[0055] The worker then grasps the gripping portion 523 of the gripping frame 52 and rotates the gripping frame 52 upward. As a result, the gripping frame 52 rotates downward inside the dike 2 together with the inner wall surface pressing member 53. The surface of the buffer material 531 of the inner wall surface pressing member 53 then comes into close contact with the inner wall surface 21 of the dike 2. In this state, the worker can operate the knob 542 of the gripping frame 52 to stop the rotation of the hook member 51 and the gripping frame 52, thereby causing the surface of the buffer material 531 of the inner wall surface pressing member 53 connected to the gripping frame 52 to press against the inner wall surface 21 of the dike 2. Furthermore, when the worker rotates the gripping frame 52 using the gripping portion 523, the protrusion 524 provided on the second rotation mechanism 55 causes the surface of the cushioning material 531 of the inner wall surface pressing member 53 to be positioned generally opposite the inner wall surface 21 of the liquid barrier 2, so that the worker can smoothly press the surface of the cushioning material 531 of the inner wall surface pressing member 53 against the inner wall surface 21 of the liquid barrier 2 by rotating the gripping frame 52.

[0056] Next, the worker hangs the compression elastic body 60 and the container 90 from the hook member 51 of the sheet fixing device 50 (s5). Specifically, the worker hangs the compression elastic body 60 from the hooking hole 56 of the hook member 51, and then hangs the container 90 by hooking the hook 62 at the lower end of the compression elastic body 60 into the hooking hole 92 of the container 90.

[0057] The worker then places the mass bodies 70 in the container 90 (s7; see FIG. 2). For example, the worker checks the surface condition (color, wetness, odor, etc.) of the liquidproof sheet 30 on the outer wall surface 22 to confirm the penetration and scattering of the contents 4 that have leaked from the tank 3 into the liquidproof sheet 30, and identifies the areas where the contents 4 have penetrated or scattered (damaged area 8 and splash area 9; see FIG. 6). The worker then places multiple mass bodies 70 in the container 90 so that they are leaning against the outer wall surface 22 and so that no large gaps are formed between them. The worker then stacks the mass bodies 70 until all of the damaged area 8 and splash area 9 are hidden.

[0058] As the mass bodies 70 are accommodated in the container 90, the height of the container 90 slowly decreases due to the elastic force of the compressible elastic body 60, and as a result, the contact area between the bottom of the container 90 and the ground surface 6 gradually increases. That is, as the height of the mass bodies 70 piled up inside the container 90 increases, the force with which the mass bodies 70 press against the outer wall surface 22 of the liquid barrier 2 and the liquid barrier sheet 30 increases, while each mass body 70 is gradually piled up, spreading out from the outer wall surface 22 to its surroundings. This allows workers to easily and intensively pile up a large number of mass bodies 70 in the damaged area 8 and the splash area 9.

[0059] The use of the container 90 as described above provides the following advantages. Conventionally, as shown in FIG. 7(a), mass bodies 70 were simply piled up near the outer wall surface 22. However, in this embodiment, as shown in FIG. 7(b), by stacking mass bodies 70 on a container 90 provided on the outer wall surface 22, the mass bodies 70 can be concentrated in the damaged area 8 and the splash area 9 of the outer wall surface 22 (reference numeral 200), thereby significantly reducing the labor required by workers. The weight of these mass bodies 70 strongly presses against the damaged area 8 and the splash area 9 (the outer wall surface 22 and the liquid-proof sheet 30), effectively preventing the contents 4 of the tank 3 from leaking outside the liquid-proof dike 2. Furthermore, the weight of these mass bodies 70 sufficiently secures the lower part of the liquid-proof sheet 30 without using fasteners, thereby simultaneously reducing the amount of work required to secure the liquid-proof sheet 30.

[0060] Furthermore, the worker can simply stack the mass bodies 70 inside the container 90 until the damaged area 8 and splash area 9 that he or she has identified are no longer visible, making it easy to determine the amount of mass bodies 70 that need to be stacked to prevent leakage of the contents 4.

[0061] As described above, the method for preventing liquid leakage in this embodiment involves fixing a liquid-proof sheet that prevents the liquid (contents 4 leaked from the tank 3) from scattering to the top of the liquid barrier with a fixing device (sheet fixing device 50), thereby covering at least the area (damaged area) of the outer wall surface of the liquid barrier where the liquid has reached or is likely to reach, from the top to the bottom of the outer wall surface of the liquid barrier, and storing and stacking multiple mass bodies so that they lean against the outer wall surface of the liquid barrier in a container that is connected to the fixing device at the top of the liquid barrier and is installed on or near the ground surface so that it is in contact with or close to the outer wall surface.

[0062] In this way, by providing the liquid-proof sheet 30 on the outer wall surface 22 of the liquid barrier 2, the scattering of the liquid (leaked contents 4) can be prevented, facilitating the work of workers to prevent leakage. Furthermore, by stacking the mass bodies 70 so that they lean against the outer wall surface 22 of the liquid barrier 2, the weight of the mass bodies 70 can prevent the liquid (contents 4) from leaking. Furthermore, because the mass bodies 70 are contained in the container 90, even when the outer wall surface 22 is damaged or the contents 4 have scattered, or when the reachable area of ​​the contents 4 (the damaged area 8 of the outer wall surface 22 and, in some cases, the splash area 9 of the outer wall surface 22 that requires leakage countermeasures) is wide, and a large number of mass bodies 70 need to be provided, the mass bodies 70 can be placed in a concentrated and efficient manner in the reachable area.

[0063] As described above, according to the method for preventing liquid leakage according to this embodiment, the outflow of liquid from the liquid barrier dam 2 can be effectively prevented by a simple process.

[0064] Furthermore, in the method for preventing liquid leakage according to this embodiment, the container is hung via a compressible elastic body (such as a pull spring) attached to the fixing device, and is set on the side of the outer wall surface of the liquid barrier, and the container 90 is lowered by accommodating the mass body 70 in the hanging container 90.

[0065] As a result, as the number of contained masses 70 increases, the containers 90 gradually lower and spread out over the ground, and as a result, the masses 70 gradually cover the reachable area (damage area 8 and splash area 9). In this way, the masses 70 can be efficiently arranged.

[0066] Furthermore, in the liquid leakage prevention method according to this embodiment, the scattering area of ​​the contents 4 on the liquid-proof sheet is identified based on the surface condition of the liquid-proof sheet, and the mass body is contained in the container to a height where the scattering area on the surface of the liquid-proof sheet is hidden by the mass body.

[0067] In this way, by setting the reachable area (damaged area 8 and splash area 9) of the contents 4, which is determined by the surface condition of the liquidproof sheet 30, as the target height of the stacked mass bodies 70, it is possible to effectively prevent leakage of the contents 4. In this case, the height to which the mass bodies 70 should be stacked can be easily determined by checking the surface condition of the liquidproof sheet 30.

[0068] In addition, in the method for preventing liquid leakage according to this embodiment, the fixing device includes a first pressing member that presses one side of the liquid-proof sheet from the side of the outer wall surface of the liquid-proof dike to fix it to the upper part of the outer wall surface, and a second pressing member that presses the other side of the liquid-proof sheet from the side of the inner wall surface of the liquid-proof dike via the liquid-proof dike.

[0069] In this way, by configuring the sheet fixing device 50 to sandwich the liquid barrier 2 from both sides, the liquid barrier sheet 30 can be reliably fixed to the liquid barrier 2.

[0070] The above description of the embodiments is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents thereof.

[0071] For example, if there are multiple damaged areas 8, the above-described leakage prevention structure 10 may be provided for each damaged area 8.

[0072] Furthermore, the structure of the sheet fixing device 50 described in this embodiment is merely an example, and any structure capable of fixing the liquid-proof sheet 30 above the liquid-proof dike 2 may be used.

[0073] Furthermore, the lower end of the liquid-proof sheet 30 fixed to the outer wall surface 22 may reach the ground surface 6 or may be higher than the ground surface 6. Similarly, the height of the upper end of the liquid-proof sheet 30 may be the same as the height of the upper end of the liquid barrier 2, or may be set lower than the upper end of the liquid barrier 2.

[0074] In addition, in this embodiment, one storage body 90 is suspended by two sheet fixing devices 50, but it is also possible to use a structure in which one storage body 90 is suspended by one sheet fixing device 50, or a structure in which one sheet fixing device 50 suspends multiple storage bodies 90.

[0075] In addition, in this embodiment, the liquid-proof sheet 30 is temporarily fixed to the outer wall surface 22 of the liquid-proof dike 2 with adhesive 31, and then the sheet fixing device 50 (first extension portion 511) with adhesive 32 is pressed against the outer wall surface 22 to fix the liquid-proof sheet 30 and the sheet fixing device 50 to the liquid-proof dike 2. However, the liquid-proof sheet 30 and the sheet fixing device 50 may be bonded together in advance, and the integrated liquid-proof sheet 30 and sheet fixing device 50 may then be attached to the liquid-proof dike 2. [Explanation of symbols]

[0076] 2 Liquid dike 3 Tank 4 Contents 6 Earth's surface 8 Damage area 9 Droplet area 10 Leakage prevention structure 21 Inner wall surface 22 Exterior wall 30 Liquid-proof sheet 31 Adhesive 32 Adhesive 50 Seat Fixture 51 Hook member 52 Grasping frame 53 Inner wall pressing member 54 First rotation mechanism 55 Second rotation mechanism 56 holes 57 Compressible Elastic Body 60 Compressed Elastic Body 61 Hook 62 Hook 70 mass body 90 Containment Unit 91 Opening 92 holes 511 1st extension section 512 2nd extension section 513 sides 521 3rd extension section 522 4th extension section 523 Gripping part 524 Protrusion 531 Cushioning material 541 Shaft member 551 Shaft member

Claims

1. 1. A method for preventing leakage of liquid from a dike, comprising: a liquid-proof sheet capable of preventing the scattering of the liquid is fixed to the upper part of the liquid barrier with a fixing device, and at least the damaged area of ​​the liquid barrier is covered from the top to the bottom of the outer wall surface of the liquid barrier; a container connected to the fixing device at the top of the dike and provided on or near the ground surface so as to be in contact with or close to the outer wall surface, and a plurality of mass bodies are contained and stacked in such a way that they lean against the outer wall surface of the dike; How to prevent liquid leakage.

2. The container is attached to the outer wall surface of the dike by suspending it via a compressible elastic body attached to the fixing device, The mass body is accommodated in the suspended accommodation body, thereby lowering the accommodation body. The method for preventing leakage of a liquid according to claim 1.

3. determining a liquid-reachable area of ​​the liquid-proof sheet based on a surface condition of the liquid-proof sheet; The mass body is accommodated in the accommodation body to a height such that the reachable area on the surface of the liquid-proof sheet is hidden by the mass body. The method for preventing leakage of a liquid according to claim 1.

4. The fixing device includes a first pressing member that presses one surface of the liquid-proof sheet from the side of the outer wall surface of the liquid barrier to fix it to an upper part of the outer wall surface, and a second pressing member that presses the other surface of the liquid-proof sheet from the side of the inner wall surface of the liquid barrier via the liquid barrier. The method for preventing leakage of a liquid according to claim 1.

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