JP2023069908A - Installation structure of double-shell tank - Google Patents

Abstract

To provide a double-shell tank that enhances the reliability for liquid leakage detection even though it is relatively simply designed.SOLUTION: A double-shell tank 1 includes: an inner shell 2 made of metal in which liquid is stored; an outer shell 3 made of synthetic resin that is coated to create a gap 5 around the periphery of the inner shell 2; and a liquid leakage detection device 4 for detecting liquid leakage from the inner shell 2 into the gap 5. The liquid leakage detection device 4 includes: a liquid leakage detection tube 4a that is inserted along the vertical direction from the top of the inner shell 2 to the bottom thereof, with the upper end protruding outward from the top of the inner shell 2 and the lower opening exposed in the gap 5 at the bottom of the inner shell 2 and the outer shell 3; and a liquid leakage detection tube 4b that is inserted into the liquid leakage detection tube 4a and detects the liquid flowing into the leak detection tube 4a from the gap 5. The outer circumference of the inner shell 2 is covered with a mesh fabric 6, and the inner circumference of the outer shell 3 is provided with a resin film 3a to prevent leakage of liquid from the gap 5 to the outside.SELECTED DRAWING: Figure 1

Description

The present invention relates to a double-hull tank and an installation structure for this double-hull tank.

For example, in Patent Document 1, "In a composite (SF) double shell tank in which a resin film is wrapped around the outer periphery of a metal inner shell and then FRP (fiber reinforced plastic) or the like is sprayed, the inner shell When the liquid leaks into the gap between the bottom of the inner shell and the reinforced plastic layer (corresponding to the outer shell) composed of the resin film and the FRP, a liquid leakage detection device is installed to detect this liquid leakage. The resin film adheres to the bottom of the inner shell by applying a paint mixed with fine particles to the surface and forming a paint layer in which at least part of the fine particles protrude from the surface of the paint. to prevent this from happening”.

For example, in Patent Document 2, "In a composite (SF) double shell tank in which a resin film is wrapped around the outer periphery of a metal inner shell and then FRP (fiber reinforced plastic) or the like is sprayed, the inner shell is leaked into the gap between the bottom of the inner shell and the reinforced plastic layer (corresponding to the outer shell) composed of the resin film and the FRP, a liquid leakage detection device is equipped to detect this liquid leakage. The clearance of the double-shell tank is secured by winding a plurality of string-like members made of resin tape or the like on the surface of the inner shell in parallel."

Japanese Unexamined Patent Application Publication No. 2006-1607 JP 2011-162205 A

By the way, in Patent Literature 1, since the fine particles may gather in a part of the paint layer, there is concern that the management for evenly arranging the fine particles may be troublesome and time-consuming.

Further, in Patent Document 2, there is a concern that the work of individually winding the plurality of string-like members around the inner shell in parallel is troublesome and time-consuming.

In view of such circumstances, it is an object of the present invention to provide a double-shell tank and an installation structure for the double-shell tank that can improve the reliability of liquid leakage detection while having a relatively simple configuration. .

The double shell tank according to the present invention comprises a metal inner shell in which liquid is stored, a synthetic resin outer shell coated so as to form a gap around the outer periphery of the inner shell, and the inner shell and a liquid leakage detection device for detecting liquid leakage into the gap, wherein the liquid leakage detection device is vertically inserted into the inner shell from the top to the bottom, and the upper end of the liquid leakage detection device a liquid leakage detection tube that protrudes outward from the upper portion of the inner shell and is arranged such that a lower opening is exposed in the gap between the bottoms of the inner shell and the outer shell; a sensor for detecting liquid flowing into the liquid leakage detection tube through the gap, wherein the outer circumference of the inner shell is covered with a mesh fabric, and the inner circumference of the outer shell is arranged outside from the gap. It is characterized in that a resin film is provided to prevent liquid from leaking into.

In this configuration, the presence of the mesh fabric can prevent the resin film from adhering to and sticking to the inner shell.

In particular, when the double-shell tank is installed on an appropriate floor surface, the resin film is pressed against the mesh fabric at the bottom of the double-shell tank due to the weight of the double-shell tank, and the gap at the bottom is closed. is considered to be crushed, but minute gaps remain between each of the fibers of the mesh fabric.

Therefore, if the liquid contained in the inner shell leaks from the side of the inner shell into the gap, the liquid moves toward the bottom of the double-shell tank due to capillary action and It becomes easy to move to the lower opening of the liquid leakage detection tube through the minute gap in the gap.

As a result, liquid is collected at the lower opening of the liquid leakage detection tube through the minute gap, so that the presence or absence of liquid leakage can be reliably detected by the liquid leakage detection device. reliability is improved.

By the way, the double-shell tank can be configured in a rectangular parallelepiped shape with rounded corners.

In this configuration, the internal volume is larger than that of a double-shell tank that is cylindrical and closed at both ends in the axial direction. Moreover, since the corners are rounded, compared with the case where the corners are not rounded, stress concentration on the corners can be alleviated, and the load resistance of the double-shell tank is improved.

Further, the double-hull tank can be configured to be installed on the floor surface in a horizontal orientation such that the longitudinal direction is parallel to the horizontal direction.

Even in such an installation mode, it is possible to leave small gaps between the fibers of the mesh fabric in the gaps at the bottom of the double-shell tank.

Further, in the double-shell tank, the outer shell is adhered to a region of the inner shell above the upper limit position of the liquid storage amount, and is not adhered to a region of the inner shell other than the upper region. can be configured.

According to this configuration, it is possible to secure the gap in a region where liquid may leak from the inner shell.

Moreover, the installation structure of the double-shell tank according to the present invention is a structure in which the double-shell tank is installed on the floor surface, and the double-shell tank is set forth in any one of claims 1 to 4. A buffer sheet is interposed between the double-shell tank and the floor surface, and the lower end of the liquid leakage detection tube is placed in a predetermined area on the upper surface of the buffer sheet. a recess having a size to cover and promoting liquid recovery; and a plurality of grooves each having an inner end connected so as to be directly or indirectly connected to the recess and having an outer end opened outward from the outer peripheral surface of the buffer sheet. A belt is wound from the lower end of one side of the double-shell tank to the lower end of the other side through the upper surface, and one end side of the belt and the It is characterized by the provision of a fastening portion that is individually fastened to the other end side.

In this configuration, the bottom surface of the double-shell tank contacts the top surface of the buffer sheet, but the weight of the double-shell tank presses the resin film against the mesh fabric at the bottom surface of the double-shell tank. It is considered that the gap between the inner shell and the outer shell is crushed on the bottom surface, but a minute gap remains between each fiber of the mesh fabric.

Moreover, according to the above configuration, the recesses of the cushioning sheet and the gaps located above the plurality of grooves are not crushed.

Due to these synergistic effects, if the liquid contained in the inner shell leaks from the side of the inner shell into the gap, the liquid moves toward the bottom of the double-shell tank due to capillary action. , it becomes easier to move to the recess, that is, the lower opening of the leak detection tube through the minute gaps at the bottom and the gaps located above the plurality of grooves.

As a result, with a simple structure using only the mesh fabric, the liquid is collected at the lower opening of the liquid leakage detection tube through the minute gap, so that the presence or absence of liquid leakage can be reliably detected by the liquid leakage detection device. This improves the reliability of liquid leak detection.

In the installation structure of the double-shell tank, the floor surface is the inner bottom surface of a concave space formed in the ground, and the fastening portion is the upper end of an anchor bolt embedded in the inner bottom surface. It can be a configuration provided in.

In this configuration, when the double-shell tank is installed on the inner bottom surface of the concave space in the ground, the buffer sheet is placed on the inner bottom surface, and then the double-shell tank is placed on the buffer sheet. Just doing it is enough.

This makes it possible to install the double-shell tank relatively easily, at low cost, and stably, as compared with the case where, for example, a pedestal is installed on the inner bottom surface of the recessed space to install the double-shell tank.

In addition, in the structure of the double-shell tank, the double-shell tank has the configuration according to any one of claims 1 to 4, and a gap between the double-shell tank and the floor surface is A pedestal is arranged on the floor surface side, and a buffer sheet is interposed between this pedestal and the bottom surface of the double-shell tank, and a predetermined area on the upper surface of the buffer sheet is: A recess for storing liquid having a size that covers the lower end of the liquid leakage detection tube, and an inner end connected to the recess so as to directly or indirectly connect to the recess, and an outer end extending outward from the outer peripheral surface of the buffer sheet. A plurality of grooves open to the tank are provided, and a belt is wound from the lower end of one side of the double-shell tank to the lower end of the other side through the upper surface, and the pedestal: It is possible to adopt a configuration in which fastening portions are provided to which the one end side and the other end side of the belt are individually fastened.

In this configuration, the bottom surface of the double-shell tank contacts the top surface of the buffer sheet, but the weight of the double-shell tank presses the resin film against the mesh fabric at the bottom of the double-shell tank. Although the gap between the inner shell and the outer shell would collapse at the bottom, a micro gap would remain between each fiber of the mesh fabric.

Moreover, according to the above configuration, due to the presence of the recesses and the plurality of grooves of the buffer sheet, the gaps of the double-shell tank positioned over the recesses and grooves are not crushed.

Due to these synergistic effects, if the liquid contained in the inner shell leaks from the side of the inner shell into the gap, the liquid moves toward the bottom of the double-shell tank due to capillary action. , it becomes easier to move to the recess, that is, the lower opening of the leak detection tube through the minute gaps at the bottom and the gaps located above the plurality of grooves.

As a result, with a simple structure using only the mesh fabric, the liquid is collected at the lower opening of the liquid leakage detection tube through the minute gap, so that the presence or absence of liquid leakage can be reliably detected by the liquid leakage detection device. This improves the reliability of liquid leak detection.

Further, in the installation structure of the double-shell tank, the floor surface may be a ground surface or a floor surface in a building on the ground.

In this configuration, when the double-shell tank is installed on the ground surface or on the floor surface of a building on the ground surface, the pedestal and the buffer sheet are arranged on the floor surface, and then the double tank is placed on the buffer sheet. It is enough to simply place the shell tank.

This makes it possible, for example, to install the double-hulled tank relatively easily, at low cost, and stably, on the ground surface or on the floor surface of a building above the ground.

INDUSTRIAL APPLICABILITY The double-shell tank according to the present invention can improve the reliability of liquid leakage detection while having a relatively simple structure.

Moreover, the installation structure of the double-shell tank according to the present invention can improve the reliability of liquid leakage detection while having a relatively simple configuration.

1 is an end view showing an embodiment of a double-shell tank and installation structure for a double-shell tank according to the present invention; FIG. Figure 2 is an end view of the double-hulled tank of Figure 1 and the elements associated with its installation, separated; FIG. 2 is a side view of the installation structure of the double-shell tank of FIG. 1; It is the figure which looked at the installation structure of the double shell tank of FIG. 1 from the upper surface. A cross-sectional view taken along arrows (5)-(5) in FIG. 3 shows a single unit of the double-hulled tank. FIG. 2 is a plan view of the cushioning sheet of FIG. 1; FIG. 5 is an end view showing another embodiment of the installation structure of the double-shell tank according to the present invention; Figure 8 is an end view of the double-hulled tank of Figure 7 and the elements associated with its installation, separated; Fig. 8 is a side view of the installation structure of the double shell tank of Fig. 7; Fig. 8 is a top view of the installation structure of the double-shell tank of Fig. 7; A cross-sectional view taken along arrows (11)-(11) in FIG. 9 shows a single unit of the double shell tank. FIG. 8 is a plan view of the cushioning sheet of FIG. 7; FIG. 8 is a perspective view showing a state in which the cushioning sheet and the pedestal of FIG. 7 are separated;

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

1 to 6 show one embodiment of the invention. In the figure, 1 indicates a double shell tank.

The double shell tank 1 exemplified in this embodiment is formed in a rectangular parallelepiped shape with all corners rounded.

All the surfaces of the double shell tank 1 which consists of this rectangular parallelepiped are rectangular. All the corners of the double-shell tank 1 are rounded to form an elliptical shape (an ellipse that is nearly square).

In the case of such an elliptical double-shell tank 1, it is possible to increase the internal volume and reduce the buried area compared to a cylindrical double-shell tank closed at both ends in the axial direction. become.

Next, the structure of the double shell tank 1 will be described in detail.

The double-shell tank 1 has a composite (SF) double-shell structure having an inner shell 2 and an outer shell 3, and is equipped with a liquid leakage detection device 4 inside.

The inner shell 2 is made of metal such as steel, and contains liquids such as various fuels.

The outer shell 3 is a sheet-like member with a relatively flexible multilayer structure that covers the outer side of the inner shell 2 . The details of these inner shell 2 and outer shell 3 will be described later.

The liquid leakage detection device 4 detects liquid leakage from the inner shell 2 of the double-shell tank 1, and mainly includes a liquid leakage detection tube 4a, a sensor 4b, a detection unit (not shown), and the like. It's becoming

The liquid leakage detection tube 4a is inserted in the double shell tank 1 along the vertical direction. It is arranged so as to be exposed in the gap 5 (see FIG. 5) between the bottom surface and the bottom surface of the outer shell 3 . In addition, in FIG. 5, the gap 5 is exaggerated and enlarged for convenience of explanation.

The lower portion of the liquid leakage detection tube 4a is fixed in a state of being fitted into a through hole (not numbered) provided in the bottom surface of the inner shell 2. As shown in FIG. This fixation is, for example, welding when the liquid leakage detection tube 4a is made of metal, for example.

As shown in FIG. 5, a lid 4c having a large number of through holes is fixed to the lower opening of the liquid leakage detection tube 4a. This fixation is, for example, welding when the lid 4c is made of metal, for example.

Further, a reinforcing plate 4d is fixed around the through hole on the inner peripheral surface of the inner shell 2. As shown in FIG. This fixation is performed by welding when the reinforcing plate 4d is made of metal, for example.

The sensor 4b is housed in the liquid leakage detection tube 4a, and although not shown in detail, for example, a known float type switch is used.

This float type switch is turned on when the amount of liquid flowing into the liquid leakage detection tube 4a, that is, the liquid level, exceeds a predetermined level. However, as the sensor 4b, it is also possible to appropriately select and use various known detection devices other than the float type switch.

The detection unit (not shown) performs determination processing to determine whether or not there is liquid leakage from the inner shell 2 of the double-shell tank 1 based on the output from the sensor 4b inserted into the liquid leakage detection tube 4a, Alarm processing is performed when it is determined that there is liquid leakage.

In the determination process, it is determined that there is liquid leakage from the inner shell 2 of the double-shell tank 1 when the output of the float switch as the sensor 4b is turned on. The height of the liquid level (amount of liquid leakage) when the output of the sensor 4b is turned on is arbitrarily set.

Moreover, as the alarm process, an appropriate form can be adopted, such as a form of displaying a message on a display panel (not shown) or a form of driving a buzzer to generate an alarm sound.

Next, the structure of the double shell tank 1 will be described in detail with reference to FIG.

The outer surface of the inner shell 2 is covered with a mesh fabric 6 . The outer shell 3 includes, for example, an innermost layer made of a resin film 3a, an intermediate layer made of FRP (fiber reinforced plastic) 3b, and an outermost layer made of a topcoat (protective film) 3c.

The resin film 3a is used to prevent the FRP 3b from being directly adhered to the inner shell 2 and to prevent liquid leakage to the outside from the gap 5 (see FIG. 5).

The resin film 3a is a film made of a synthetic resin (for example, PET, vinylidene chloride, etc.) having excellent flame retardancy, chemical resistance, and weather resistance, depending on the type of liquid stored in the double-shell tank 1, for example. preferably.

The mesh fabric 6 is used to leave minute gaps in the gaps 5 described below even in a state of being pressed against the resin film 3a.

The mesh woven fabric 6 is a fabric in which a plurality of fibers are twisted together and woven into a mesh.

Examples of the fibers include materials with excellent load resistance, materials with excellent load resistance and chemical resistance, such as carbon, fluororesins, polyamide resins (for example, DuPont trade name nylon), PET (polyethylene terephthalate), ), PP (polypropylene), PEEK (polyetheretherketone), and the like.

As an example of a method of manufacturing the double-shell tank 1 having such a structure, the outer circumference of the inner shell 2 is covered with the mesh fabric 6, and the outside of the mesh fabric 6 is covered with the resin film 3a. Alternatively, the outer shell 3 may be formed by forming a layer of FRP 3b on the surface of the resin film 3a and coating the surface of the FRP 3b with a topcoat 3c.

As shown in FIG. 5, the outer shell 3 is adhered to the flat area of the ceiling of the inner shell 2, but the area from the shoulder to the bottom of the inner shell 2 is not adhered. ing.

The adhesion area is preferably set above the highest liquid level (arbitrarily set) of the liquid stored in the double-shell tank 1 .

Here, the adhesion region can adhere the FRP 3b to the surface of the inner shell 2 at the same time as forming the outer shell 3 by directly forming the FRP 3b on the surface of the inner shell 2 and then coating the top coat 3c. .

The gap 5 described above exists in the non-bonded area. In this gap 5, the mesh fabric 6 and the resin film 3a are overlaid, but they are not adhered.

A liquid leakage detection tube 4a is arranged in the center of the longitudinal direction of the ceiling of the double shell tank 1, and a second liquid leakage detection tube 4a is located on one end side of the double shell tank 1 in the longitudinal direction across the liquid leakage detection tube 4a. A first inspection opening 1a is provided, and a second inspection opening 1b is provided on the other end side.

A liquid supply pipe port 1c, a liquid delivery pipe port 1d, a liquid return pipe port 1e, a metering port 1f and the like are inserted into the inner shell 2 from the first inspection port 1a. A drain port 1g, a liquid level gauge port 1h, a vent port 1i, and the like are inserted into the inner shell 2 from the second inspection port 1b.

Next, an installation form of the double-shell tank 1 having the structure described above will be described.

In this embodiment, the double-shell tank 1 is lifted by a crane or the like (not shown) and carried horizontally on the inner bottom surface 7a of the concave space 7 in the ground.

As shown in FIGS. 3 and 4, a connecting portion between the ceiling and side walls of the double-shell tank 1 is provided with a locking portion 11 to which a suspension wire (not shown) is hooked. The engaging portion 11 is directly fixed to the outer surface of the inner shell 2 , and the outer shell 3 is not covered in the area where the engaging portion 11 exists.

The term “horizontal placement” refers to a state in which the longitudinal direction of the rectangular parallelepiped double-shell tank 1 is aligned with the horizontal direction.

The recessed space 7 is dug into the ground, and the inner wall and inner bottom of the recessed space 7 are made of a solid material such as a concrete structure.

As shown in FIGS. 1 and 3, the inner wall surface 7b of the recessed space 7 is vertical, and the inner bottom surface 7a is provided with a horizontally flat raised portion 7c.

The double-shell tank 1 is placed on the protuberance 7c via a buffer sheet 8, and the double-shell tank 1 is immovably fixed by a plurality of belts 9. As shown in FIG.

The buffer sheet 8 equalizes the surface pressure between the inner bottom surface 7a of the recessed space 7 and the bottom surface of the double-shell tank 1. As shown in FIG.

In this embodiment, the planar outer size of the buffer sheet 8 is set to be the same as the flat surface of the entire bottom of the double shell tank 1 .

As a result, the planar outer size of the buffer sheet 8 is smaller than the planar outer size of the bottom of the double-shell tank 1, as shown in FIG.

A recess 8a and a plurality of grooves 8b are provided in a predetermined region on the upper surface of the buffer sheet 8. As shown in FIG.

The concave portion 8a is formed in a circular shape in plan view at the center position of the upper surface of the buffer sheet 8. As shown in FIG. The recessed portion 8a is formed so that the lower opening of the liquid leakage detection tube 4a is arranged, and is sized to cover the lower end of the liquid leakage detection tube 4a. This concave portion 8a is provided to facilitate the movement of the liquid leaking into the gap 5 when it moves to the vicinity of the lower opening of the liquid leakage detection tube 4a.

A plurality of grooves 8b are provided in a grid pattern on the upper surface of the buffer sheet 8, and the inner ends of all the grooves 8b are directly or indirectly connected to the recesses 8a. The ends are provided so as to open outward from the outer peripheral surface of the buffer sheet 8 .

Specifically, the plurality of grooves 8b includes a plurality (three) long grooves along the long sides of the buffer sheet 8 and a plurality (nine) short grooves along the short sides.

For example, as shown in FIG. 6, only the inner ends of the central long groove and short groove are directly connected to the recess 8a, but the other long grooves and short grooves are connected directly to the center. It is indirectly connected to the concave portion 8a through the long groove and the short groove located at the .

The belt 9 is wound around a plurality of locations in the longitudinal direction of the double-shell tank 1 from the lower end of one side surface of the double-shell tank 1 to the lower end of the other side surface via the upper surface.

One end and the other end of the belt 9 are fixed to the upper ends of anchor bolts 10 (corresponding to fastening portions) embedded in the inner bottom surface of the recessed space 7 by fastening members (not shown, for example nuts 94). .

In this embodiment, as shown in FIG. 2, the belt 9 is constructed by adding three pieces 91, 92, and 93 to form one piece.

A center piece 91 of the three pieces 91 to 93 is connected to one end piece 92 and the other end piece 93, respectively.

Specifically, each of the three pieces 91 to 93 is made of an elastic material such as rubber, and both ends thereof are made of a material having excellent load resistance (such as metal or synthetic resin). Mounting portions 91a, 91b, 92a, 92b, 93a, 93b are provided.

The attachment portions 91a, 91b, 92a, 92b, 93a, and 93b are formed, for example, in an L shape.

When fastening the central piece 91 to the one end piece 92 and the other end piece 93, the mounting portions 91a, 91b, 92a, 92b, 93a, and 93b are overlapped, and the overlapping portions are fastened with a fastening member (for example, It is fastened by a threaded bolt 95 and a nut 96, etc.).

After the double-shell tank 1 is stored in the recessed space 7 in this way, a filling such as mortar or fire-preventing granular materials (eg, dry sand, artificial light sand, etc.) is placed in the recessed space 7. (illustration omitted) is filled. This filling may or may not be filled.

Then, as shown in FIG. 3, the upper opening of the recessed space 7 is closed with a solid material such as a concrete structure. This solid material becomes the closing portion 7 d of the recessed space 7 .

The blocking portion 7d is provided with three manholes 7e, 7f, and 7g as entrance and exit passages for workers.

The three manholes 7e, 7f, and 7g are provided so as to cover the first inspection port 1a, the second inspection port 1b, and the upper end of the liquid leakage detection pipe 4a, respectively. Covers (reference numerals omitted) are attached to these manholes 7e, 7f and 7g so as to be able to be opened and closed.

Thus, when the double-shell tank 1 is installed on the inner bottom surface 7a of the underground recessed space 7, the buffer sheet 8 is placed on the inner bottom surface 7a, and then the double-shell tank is placed on the buffer sheet 8. It suffices to simply perform the operation of placing the tank 1 .

As a result, compared to the case of installing a pedestal (not shown) on the inner bottom surface 7a of the recessed space 7, the double-shell tank 1 can be installed relatively easily, at a low cost, and stably. becomes possible.

Moreover, when the double-shell tank 1 is installed on the inner bottom surface 7a of the recessed space 7, the resin film 3a of the outer shell 3 at the bottom of the double-shell tank 1 is stretched into the mesh-like fabric 6 by the weight of the double-shell tank 1. It is thought that the gaps 5 at the bottom are crushed due to the pressure contact, but minute gaps remain between the fibers of the mesh fabric 6 .

Moreover, according to the above configuration, the gaps located above the recesses 8a and the plurality of grooves 8b of the cushioning sheet 8 are not crushed.

Due to these synergistic effects, if the liquid contained in the inner shell 2 leaks from the side of the inner shell 2 into the gap 5, the liquid moves toward the bottom of the double-shell tank 1 due to capillary action. , through the minute gaps at the bottom and the gaps 5 located above the plurality of grooves 8b, to the recess 8a, that is, the lower opening of the liquid leakage detection tube 4a.

As a result, the liquid is collected at the lower opening of the liquid leakage detection tube 4a through the minute gap, so that the presence or absence of liquid leakage can be reliably detected by the liquid leakage detection device 4, thereby improving liquid leakage detection. reliability is improved.

As described above, according to the embodiment to which the present invention is applied, a double-shell tank having a rectangular parallelepiped-shaped composite double-shell structure with a large internal volume while reliably ensuring liquid leak detection by the liquid leak detection device 4 1 can be installed horizontally in the ground in a stable state.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified as appropriate within the scope of the claims and equivalents thereof.

(1) The installation location of the double-shell tank 1 according to the present invention is not particularly limited.

For example, as shown in FIGS. 7 to 13, it is possible to install the double-hull tank 1 horizontally on the ground surface or on the floor surface 20 in a building on the ground.

In such an installation form, the difference from the installation forms shown in FIGS. 1 to 6 is that a pedestal 30 is used.

Specifically, in this installation mode, a pedestal 30 is arranged on the floor surface 20, and a buffer sheet 8 is laid on the pedestal 30, and the double-shell tank 1 is placed on the buffer sheet 8. I am trying to

The planar outer size of the buffer sheet 8 is set smaller than the outer size of the bottom surface of the double-shell tank 1, as shown in FIG. 12, as in the above embodiment.

As shown in FIG. 13, the pedestal 30 has a structure in which a grid portion 32 is attached to the inner space of a rectangular outer frame 31 .

The planar outer size of the pedestal 30 is formed to be the same as the planar outer size of the buffer sheet 8 .

The outer frame 31 is constructed by combining and welding two long bars 31a made of so-called C-shaped steel plates and two short bars 31b made of so-called C-shaped steel plates in a rectangular shape.

Fasteners 33 for fixing the belts 9 are fixed at a plurality of positions in the longitudinal direction of the long bar 31 a of the outer frame 31 . This fixation is, for example, welding when the fastening portion 33 is made of metal. Then, the attachment portions 92b and 93b of the belt 9 and the fastening portion 33 are overlapped, and the overlapped portions are coupled with fastening members (for example, bolts 34, nuts 35, etc.).

The lattice portion 32 is configured by combining first bars 32a made of two so-called C-shaped steel plates and second bars 32b made of three so-called C-shaped steel plates in a lattice shape.

The first bar 32a of the lattice portion 32 is joined by welding, for example, so as to bridge between the two long bars 31a of the outer frame 31. As shown in FIG.

Of the three second bars 32b of the lattice portion 32, the second bars 32b located at both ends are joined by welding, for example, so as to bridge between the first bars 32a and the short bars 31b of the outer frame 31. ing.

Among the three second bars 32b of the grid portion 32, the central second bar 32b is joined by welding, for example, so as to bridge between the two first bars 32a.

As described above, when the double-shell tank 1 is installed on the ground surface or the floor surface 20 in a building on the ground using the pedestal 30, the pedestal 30 and the buffer sheet 8 are arranged on the floor surface 20. Therefore, it is sufficient to simply place the double-shell tank 1 on the buffer sheet 8 . As a result, it is possible to stably install them relatively easily and at low cost.

Moreover, even in the configuration in which the double-shell tank 1 is installed, the detection of liquid leakage by the liquid-leak detection device 4 can be reliably secured, as in the configuration in which the double-shell tank 1 is installed in the recessed space 7 in the ground. At the same time, the double-shell tank 1 having a rectangular parallelepiped composite double-shell structure with a large internal volume can be stably installed horizontally on the ground surface or on the floor surface 20 in a building on the ground.

(2) The installation posture of the double-shell tank 1 according to the present invention is not particularly limited.

For example, although not shown, it is possible to install the double-shell tank 1 vertically. The vertical placement means that the longitudinal direction of the rectangular parallelepiped double-shell tank 1 is aligned with the vertical direction. In this case, the bottom surface of the double-shell tank 1 can be placed on the floor with the buffer sheet 8 interposed therebetween. It is conceivable to set the

When the double-shell tank 1 is placed vertically in this manner, it is advantageous for installation on the floor surface or underground of a building on a narrow site.

(3) In the above-described embodiment, the types of objects to be inserted into the first and second inspection openings 1a and 1b provided in the ceiling of the double-shell tank 1 are not particularly limited. 1 may be appropriately specified according to the intended use.

(4) In the above embodiment, when the space generated between the recessed space 7 and the double-shell tank 1 is filled with a large amount of filler (not shown), for example, although not shown, the filler It is possible to install an external liquid leak detection device in the

This outer liquid leakage detection device is for checking whether or not liquid is leaking from the outer shell 3 of the double-shell tank 1, and a known configuration can be used.

(5) In the above embodiment, an elliptical double shell tank 1 is taken as an example. The installation structure of the shell tank and the double shell tank can be used.

INDUSTRIAL APPLICABILITY The present invention can be suitably used for a double-shell tank and an installation structure for the double-shell tank.

1 double shell tank 2 inner shell 3 outer shell
3a resin film
3b FRP
3c top coat 4 liquid leak detector
4a liquid leak detection tube
4b sensor 5 gap 6 mesh fabric 7 recessed space
7a inner bottom
7b inner wall surface
7c ridge
7d closing part 8 cushioning sheet
8a recess
8b Groove 9 Belt 10 Anchor bolt 11 Locking portion 20 Floor surface 30 Pedestal
33 Fastener

The present invention relates to an installation structure for a double-hull tank .

The underground installation structure of the double-shell tank according to the present invention is a structure in which the double-shell tank is installed on the floor surface, and the double-shell tank is installed on the floor surface, and the double-shell tank is: An inner shell made of metal in which liquid is stored, an outer shell made of synthetic resin coated so as to create a gap around the outer periphery of the inner shell, and a liquid leakage from the inner shell to the gap is detected. wherein the liquid leakage detection device is inserted vertically from the top to the bottom of the inner shell and has an upper end protruding outward from the top of the inner shell, a liquid leakage detection tube arranged so that a lower opening is exposed to the gap between the bottoms of the inner shell and the outer shell; and a liquid leakage detection tube inserted into the liquid leakage detection tube and flowing into the liquid leakage detection tube through the gap. and a sensor for detecting a liquid that flows through the inner shell, the outer periphery of the inner shell is covered with a mesh fabric, and the inner periphery of the outer shell is covered with a resin for preventing liquid leakage from the gap to the outside. A film is provided, a buffer sheet is interposed between the double shell tank and the floor surface, and a predetermined region on the upper surface of the buffer sheet is provided with a lower end of the liquid leakage detection tube. a recess having a size to cover and promoting liquid recovery; and a plurality of grooves each having an inner end connected so as to be directly or indirectly connected to the recess and having an outer end opened outward from the outer peripheral surface of the buffer sheet. A belt is wound from the lower end of one side of the double-shell tank to the lower end of the other side through the upper surface, and one end side of the belt and the It is characterized by the provision of a fastening portion that is individually fastened to the other end side .

In particular, when the double-shell tank is installed on an appropriate floor surface, the bottom surface of the double-shell tank comes into contact with the top surface of the buffer sheet. It is thought that the gap between the inner shell and the outer shell is crushed on the bottom surface by the resin film being pressed against the mesh fabric, but small gaps remain between the fibers of the mesh fabric. It will be. Moreover, according to the above configuration, the recesses of the cushioning sheet and the gaps located above the plurality of grooves are not crushed .

Due to these synergistic effects , if the liquid contained in the inner shell leaks from the side of the inner shell into the gap, the liquid moves toward the bottom of the double-shell tank due to capillary action. , it becomes easier to move to the recess , that is, the lower opening of the leak detection tube through the minute gaps at the bottom and the gaps located above the plurality of grooves .

As a result, with a simple structure using only the mesh fabric, the liquid is collected at the lower opening of the liquid leakage detection tube through the minute gap, so that the presence or absence of liquid leakage can be reliably detected by the liquid leakage detection device. This improves the reliability of liquid leak detection.

Further, in the installation structure of the double-shell tank according to the present invention, the floor surface is an inner bottom surface of a concave space formed in the ground, and the fastening portion is an anchor embedded in the inner bottom surface. It is characterized in that it is provided at the upper end of the bolt .

Further, the double-shell tank is installed on the floor surface , and the double-shell tank is configured as described in any one of claims 1 to 4, and the double-shell tank and the floor surface, a pedestal is arranged on the floor side, and a buffer sheet is interposed between the pedestal and the bottom surface of the double-shell tank, and the buffer sheet In a predetermined area on the upper surface of the liquid leakage detection tube, a recess for storing liquid having a size that covers the lower end of the liquid leakage detection tube is connected so that the inner end is directly or indirectly connected to the recess, and the outer end is respectively connected to the recess. A plurality of grooves opened outward from the outer peripheral surface of the buffer sheet are provided, and a belt is wound from the lower end of one side of the double-shell tank to the lower end of the other side through the upper surface. The pedestal may be provided with a fastening portion to which the one end side and the other end side of the belt are individually fastened.

Claims (8)

An inner shell made of metal in which liquid is stored, an outer shell made of synthetic resin coated so as to create a gap around the outer periphery of the inner shell, and a liquid leakage from the inner shell to the gap is detected. and a liquid leakage detection device of
The liquid leakage detection device is vertically inserted into the inner shell from top to bottom, has an upper end protruding outward from the top of the inner shell, and has a lower opening extending from the inner shell and the outer shell. a liquid leakage detection tube arranged to be exposed in the gap at the bottom of the shell; and a sensor inserted into the liquid leakage detection tube and detecting liquid flowing into the liquid leakage detection tube through the gap,
The outer periphery of the inner shell is covered with a mesh fabric, and the inner periphery of the outer shell is provided with a resin film for preventing liquid leakage from the gap to the outside. double shell tank. The double-shell tank according to claim 1,
A double-shell tank characterized by having a rectangular parallelepiped shape with rounded corners. The double-shell tank according to claim 2,
A double-shell tank characterized by being installed on a floor surface in a horizontal orientation such that the longitudinal direction is along the horizontal direction. A double-hulled tank according to any one of claims 1 to 3,
The double shell, wherein the outer shell is bonded to a region above the upper limit position of the liquid storage volume in the inner shell, and is not bonded to a region of the inner shell other than the upper region. tank. A structure in which the double-shell tank is installed on the floor,
The double-shell tank is configured according to any one of claims 1 to 4,
A buffer sheet is interposed between the double-shell tank and the floor,
A predetermined area on the upper surface of the buffer sheet is connected to a recess for promoting liquid recovery that is sized to cover the lower end of the liquid leakage detection tube, and the inner end is connected to the recess so as to be directly or indirectly connected to the recess, and a plurality of grooves each having an outer end opened outward from the outer peripheral surface of the buffer sheet,
A belt is wound from the lower end of one side of the double-shell tank to the lower end of the other side through the upper surface,
The installation structure of the double-shell tank, wherein the floor surface is provided with fastening portions for individually fastening one end side and the other end side of the belt. In the installation structure of the double shell tank according to claim 5,
The floor surface is an inner bottom surface of a concave space formed in the ground,
The installation structure of a double-shell tank, wherein the fastening portion is provided at the upper end of an anchor bolt embedded in the inner bottom surface. A structure in which the double-shell tank is installed on the floor,
The double-shell tank is configured according to any one of claims 1 to 4,
A pedestal is arranged on the floor surface side between the double-shell tank and the floor surface,
A buffer sheet is interposed between the pedestal and the bottom surface of the double shell tank,
In a predetermined area on the upper surface of the buffer sheet, a recess for storing liquid having a size that covers the lower end of the liquid leakage detection tube is provided. a plurality of grooves whose ends are opened outward from the outer peripheral surface of the buffer sheet, and
A belt is wound from the lower end of one side of the double-shell tank to the lower end of the other side through the upper surface,
The installation structure of the double-shell tank, wherein the pedestal is provided with a fastening portion to which one end side and the other end side of the belt are individually fastened. In the installation structure of the double shell tank according to claim 7,
The installation structure of the double shell tank, wherein the floor surface is a ground surface or a floor surface in a building on the ground.

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