JP2021104831A - Tank and underground installation structure of tank - Google Patents

Abstract

To reliably detect accidental liquid leakage from the inner shell of a tank with duplex shell structure that can prevent liquid from leakage underground after being able to vertically install the tank in the ground stably.SOLUTION: A tank 1 with duplex shell structure that is tubular and has both ends in the longitudinal direction closed is placed vertically, the entire circumference of the upper end of a tubular support leg 3 is joined to the other end side (lower end side) of the inner shell 1a in the longitudinal direction, and the support leg 3 is stored and installed on the inner bottom of a storage part 2 installed in the ground. A non-adhesive facing gap 7A between the inner shell 1a and the outer shell 1b above the joining part and a non-adhesive facing gap 7B between the inner shell 1a and the outer shell 1b below the joining part communicate via a bypass pipe 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tubular composite double-shell structure tank that is installed vertically in the ground and a structure in which the tank is installed vertically in the ground.

For example, FIG. 17 shows a structure in which a tank 100 having a single-shell structure is conventionally installed vertically in the ground.

In FIG. 17, the upper end of the cylindrical support leg 102 is joined to a predetermined position near the bottom of the tank 100 having a single shell structure, and the support leg 102 is connected to the inner bottom portion of the storage portion 101 formed of a concave space in the ground. I try to install it on top.

The storage portion 101 is made of a concrete structure. The support legs 102 are fixed to anchor bolts 103 embedded and installed in the inner bottom portion of the storage portion 101. A reinforcing plate 104 is attached to the support leg 102.

If the tank 100 installed in the ground is made of a metal such as a steel material, corrosion or pitting corrosion may occur due to aging or the like, and liquid leakage into the ground may occur. When the liquid stored in the tank 100 is used as a dangerous substance such as fuel, it is stipulated that the liquid leakage detection equipment must be equipped based on the Fire Service Act.

By the way, as the liquid leakage detection equipment used for the tank 100 with the single shell structure as described above, "Illustration, quick understanding of hazardous material facility standards (2)" supervised by the Tokyo Fire Department and issued by Tokyo Law Publishing Co., Ltd. In addition, liquid leakage is detected by providing leak detection tubes at four or more locations around the tank, or liquid leakage is detected by constantly monitoring changes in the amount of liquid stored in the tank. Is described.

A composite double-shell tank is known which is excellent in terms of preventing liquid leakage into the ground even if liquid leakage occurs in the tank 100 having such a single-shell structure.

This composite double-shell tank has a double-shell structure in which the outer circumference of a metal inner shell is covered with an outer shell made of FRP (fiber reinforced plastic), and is generally called "SF double-shell tank". being called.

When such a composite double-shell tank is used, it is required to equip the liquid leakage detection equipment for the SF double-shell tank described in the above-mentioned book.

In this liquid leakage detection equipment, a liquid leakage detection tube is arranged in the metal inner shell of the composite double shell tank, and the liquid in the inner shell is the bottom of the inner shell and the outer shell made of FRP. When the liquid leaks into the non-adhesive facing gap, the liquid flows into the liquid leakage detection tube, and when the liquid level in the liquid leakage detection tube exceeds a predetermined value, a liquid leakage warning is issued. be.

By the way, at present, the above-mentioned composite double-shell tank is only realized in a horizontal position and buried in the ground, and it is not assumed that the composite double-shell tank is installed in a vertical position in the ground.

Incidentally, Patent Document 1 is known as a prior art for installing a tank vertically in the ground.

Patent Document 1 describes that a water tank having a double-shell structure is vertically placed and buried in the ground. In Patent Document 1, the lower opening of the vertical member is opened in the facing gap between the inner shell and the outer shell at the bottom of the water storage tank, and the detection unit of the gas detector is inserted into the vertical member. It has become.

The material of the inner shell and the outer shell is not clearly described in the specification of Patent Document 1, but by analogy with the technical level at the time of filing and the illustrated form of the inner shell and the outer shell, the said It is considered that both the inner shell and the outer shell are made of a metal material.

Jikkai Sho 57-3689

By the way, when the composite double-shell tank is installed vertically in the ground, assuming that the support legs 102 shown in FIG. 17 are used, for example, although not shown, the composite double-shell tank is installed. It is conceivable to join the entire circumference of the upper end of the support leg 102 to the lower part of the constituent metal inner shell.

In such a case, the non-adhesive facing gap between the metal inner shell and the FRP outer shell above the joint portion, and the inner shell and the outer shell below the joint portion. The non-adhesive facing gap becomes discontinuous.

Therefore, if the liquid in the inner shell leaks to the upper facing gap, the liquid leaked to the upper facing gap cannot move to the lower facing gap. The liquid leak detection equipment for the SF double-shell tank cannot detect the liquid leak.

Therefore, conventionally, it is not possible to adopt the liquid leakage detection equipment for the SF double shell tank described above for the composite double shell tank.

In view of such circumstances, the present invention makes it possible to stably install a tank having a composite double-shell structure that can prevent liquid leakage into the ground in a vertical position in the ground. The purpose is to ensure that a liquid leak from the inner shell of the tank can be detected.

Further, in the present invention, a tank having a composite double-shell structure capable of preventing liquid leakage into the ground can be stably installed vertically in the ground, and then from the inner shell of the tank. The purpose is to provide a structure that can reliably detect liquid leakage in the unlikely event of a liquid leak.

The present invention is a cylindrical tank in which both ends in the longitudinal direction are closed, and a metal inner shell in which a liquid is stored, and at least the inner shell coated so as to cover the entire inner shell. It has a composite double-shell structure including a non-adhesive synthetic resin outer shell in a region from a predetermined position on one end side in the longitudinal direction to the other end side in the longitudinal direction, and the other end side in the longitudinal direction of the inner shell. Is equipped with a metal support leg for vertically floating the tank on the inner bottom of a storage portion provided in the ground, and the support leg is formed in a tubular shape. The entire circumference of the upper end thereof is joined to a predetermined position near the other end in the longitudinal direction on the outer peripheral surface of the inner shell, and the outer shell is adhered to the outside of the joint portion so as to cover the inner shell. A liquid leakage detection device for detecting liquid leakage from the inner shell is installed in the shell, and this liquid leakage detection device is inserted along the vertical direction into the inner shell which is vertically placed. The upper part is projected outward from one end side in the longitudinal direction of the tank, and the lower opening is arranged so as to be exposed in the gap between the deepest position on the other end side in the longitudinal direction of the inner shell and the outer shell. A liquid leakage detection tube and a sensor inserted into the liquid leakage detection tube to detect the liquid flowing into the liquid leakage detection tube are provided, and the inner shell and the outer shell are provided above the joint portion. The non-adhesive facing gap and the non-adhesive facing gap between the inner shell and the outer shell below the joint portion are communicated with each other by a bypass pipe.

In this configuration, since the upper end of the support leg is joined to the entire circumference of the outer peripheral surface of the other end side (lower end side) of the vertical tank in the longitudinal direction, it is possible to prevent liquid leakage into the ground. The tank having a double shell structure can be stably installed vertically, and the joint strength of the support legs can be increased as much as possible.

Even if such a joining form is adopted, in the above configuration of the present invention, if a liquid leaks into the facing gap on the upper side, the liquid passes through the bypass pipe and is said to be the same. Since it is guided to the lower facing gap, the liquid leakage can be reliably detected by the liquid leakage detecting device.

As a result, the tank having the composite double shell structure is stably installed vertically in the ground of the narrow site, and the detection operation by the liquid leakage detection device is surely guaranteed.

By the way, in the tank, one opening of the bypass pipe is connected to the inner shell so as to be exposed near the lower edge of the facing gap on the upper side, and the other opening of the bypass pipe is the liquid leakage detection pipe. It can be configured to be connected so as to be exposed inside.

In this configuration, if a liquid leaks into the upper facing gap, the liquid quickly reaches the deepest position of the lower facing gap via the bypass pipe and the liquid leakage detection pipe. You will be guided.

Further, in the tank, the bypass pipe is installed so as to be inclined diagonally downward from one opening to the other opening, and the other opening is connected to the lower end of the liquid leakage detection pipe. Can be configured as

In this configuration, the liquid that has flowed into the bypass pipe easily reaches the lower facing gap via the liquid leakage detection pipe.

Further, in the tank, the bypass pipe is formed so as to extend in a straight line from the one opening to the other opening, and is installed so as to be in a posture perpendicular to the central axis of the tank. Can be configured as

With this configuration, the manufacturing of the bypass pipe and the installation work thereof become relatively simple, so that it is possible to contribute to the reduction of equipment cost.

Further, in the tank, one opening of the bypass pipe is connected to the inner shell so as to be exposed near the lower edge of the facing gap on the upper side, and the other opening of the bypass pipe is facing the lower side. It can be configured to be connected to the inner shell so as to be exposed in the gap.

In this configuration, the total length of the bypass pipe can be shortened as compared with the case where the bypass pipe is connected so as to be erected between the inner shell and the liquid leakage detection pipe. The occupancy rate of the bypass pipe and the weight of the bypass pipe in the above embodiment can be reduced as compared with the above embodiment.

Further, in the tank, the lower edge (upper edge of the lower facing gap) of the outer shell adhesive region with respect to the joint portion is straightened along the radial direction of the inner shell, and the adhesive region is formed. By tilting the upper edge (lower edge of the upper facing gap) by a predetermined angle with respect to the lower edge of the adhesive region, the width of the adhesive region along the vertical direction is increased by one opening of the bypass pipe with respect to the inner shell. It can be configured to be narrowest below the connection position of the above and gradually widened from the narrowest position toward a position facing 180 degrees.

According to this configuration, if the liquid in the inner shell leaks into the facing gap on the upper side, the leak position of the liquid may be anywhere on the peripheral portion of the inner shell. The liquid is quickly guided to the lowest position (the deepest position of the tank) in the lower facing gap.

As a result, even if the liquid in the inner shell leaks from any position in the peripheral portion of the inner shell to the upper facing gap, this liquid leakage is detected by the liquid leakage detection device at a relatively early stage. Will be possible.

Further, in the tank, at least one position in the circumferential direction of the support leg may be provided with a through hole for communicating the inside and the outside of the support leg.

According to this configuration, in the process of installing the tank, for example, mortar or a large number of granular members can be relatively easily introduced into the space inside the support legs through the through holes.

Further, in the underground installation structure of the tank according to the present invention, the tank according to any one of claims 1 to 5 is vertically stored and arranged inside the storage portion provided in the ground. The space surrounded by the inner bottom surface of the tank, the outer surface on the other end side in the longitudinal direction of the tank, and the inner peripheral surface of the support leg is filled with mortar or a large amount of granular members.

In this configuration, when the space is filled with the mortar, the supporting strength of the tank is improved as compared with the case where the mortar is not filled.

On the other hand, when the space is filled with the large amount of granular members, it is useful as an anti-inflammatory agent in the event of a fire caused by liquid leakage.

In the tank according to the present invention, a composite double-shell structure capable of preventing liquid leakage into the ground can be stably installed vertically, and in the unlikely event that the inner shell of the tank is used. It is possible to reliably detect liquid leakage. This makes it possible to provide a tank suitable for safe installation on a small site.

Further, the underground installation structure of the tank according to the present invention makes it possible to stably install a tank having a composite double-shell structure that can prevent liquid leakage into the ground by vertically placing it in the ground. Moreover, it is possible to reliably detect a liquid leak from the inner shell of the tank. This makes it possible to provide an underground installation structure of a tank suitable for safe installation on a small site.

It is a partial cross-sectional view which shows one Embodiment of the underground installation structure of the tank which concerns on this invention. It is a top view which shows the ceiling part of the tank in FIG. It is sectional drawing which enlarges and shows the region shown by the arrow (3) of FIG. It is a perspective view which shows the tank and the support leg of FIG. 1 separately. It is sectional drawing which enlarges and shows the region shown by the arrow (5) of FIG. It is sectional drawing which enlarges and shows the region shown by the arrow (6) of FIG. It is a partial cross-sectional view which shows the other embodiment of the underground installation structure of the tank which concerns on this invention. It is sectional drawing which enlarges and shows the region shown by the arrow (8) of FIG. It is a partial cross-sectional view which shows the other embodiment of the underground installation structure of the tank which concerns on this invention. It is sectional drawing which enlarges and shows the region shown by the arrow (10) of FIG. It is a partial cross-sectional view which shows the other embodiment of the underground installation structure of the tank which concerns on this invention. 11 is a view of the cross section of the line (12)-(12) of FIG. 11 viewed from the direction of the arrow. It is a partial cross-sectional view which shows the other embodiment of the underground installation structure of the tank which concerns on this invention. It is a partial cross-sectional view which shows the other embodiment of the underground installation structure of the tank which concerns on this invention. It is a side view which shows the appearance as seen from the arrow (16) of FIG. 14 in an enlarged manner. It is sectional drawing which enlarges and shows the region shown by the arrow (16) of FIG. It is a partial cross-sectional view which shows the underground installation structure of the tank of the conventional single shell structure.

Hereinafter, the best embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 show an embodiment of the present invention. In the figure, 1 is a tank, 2 is a storage part, 3 is a support leg, and 4 is a liquid leakage detection device.

The tank 1 has a double-shell structure including an inner shell 1a and an outer shell 1b. The inner shell 1a is made of a metal such as a steel material, and liquids such as various fuels are stored in the contents thereof. The outer shell 1b is formed of a synthetic resin such as FRP (fiber reinforced plastic), and is coated on the outside of the inner shell 1a. As is clear from this description, the tank 1 illustrated in this embodiment has a composite (SF) double shell structure.

The tank 1 having such a double-shell structure is formed in a cylindrical shape having an axial dimension larger than the radial dimension, and is formed in a shape in which both ends in the axial direction (longitudinal direction) are closed. One end side and the other end side in the axial direction (longitudinal direction) of the tank 1 are formed in a rounded partial spherical shape, and are called, for example, a mirror plate.

The tank 1 is housed and arranged inside the storage unit 2 in a vertically long posture via the support legs 3.

The above-mentioned vertical installation is a posture in which the central axis of the cylindrical tank 1 is along the vertical direction. When the tank 1 is arranged vertically in this way, one end side in the axial direction (longitudinal direction) of the tank 1 becomes the ceiling portion, and the other end side in the axial direction (longitudinal direction) of the tank 1 becomes the bottom portion. The ceiling and bottom of the tank 1 form the above-mentioned end plate.

Then, the space surrounded by the inner bottom surface of the storage portion 2, the outer surface of the bottom portion of the tank 1, and the inner peripheral surface of the support legs 3 is filled with the mortar 5, so that the support strength of the tank 1 is improved as much as possible. It has become so.

Further, the space between the storage portion 2 and the tank 1 is filled with a large amount of granular members (for example, dry sand, artificial light sand, etc.) 6.

The ceiling of the tank 1 is provided with a supply port 1c, a take-out port 1d, an air port 1e, a storage amount detection port 1f, an inspection port 1g, and the like.

The supply port 1c is provided for introducing a liquid. The take-out port 1d is provided to take out the liquid inside. The storage amount detection port 1f is provided to pass the wiring of the liquid storage amount detection sensor (not shown) installed in the tank 1 inside and outside the tank 1.

As shown in FIG. 3, the outer shell 1b is adhered to the region from the ceiling to the shoulder of the inner shell 1a, but the region from the shoulder to the front of the bottom of the inner shell 1a and the inner shell 1a. It is said that it is not adhered to the bottom of the. There will be a gap in this non-adhesive region. In FIG. 3, the gap is exaggerated.

Here, the outer shell 1b adhered to the region from the ceiling to the shoulder of the inner shell 1a has a two-layer structure as if an FRP layer was sprayed on the adhesive region and then a top coat was applied thereto. ing.

Further, the outer shell 1b, which is non-adhesive in the region from the shoulder to the bottom of the inner shell 1a, is a film (tank 1) having excellent flame retardancy, chemical resistance, and weather resistance such as vinylidene chloride in the non-adhesive region. It has a three-layer structure in which an FRP layer is sprayed on the cover, and then a top coat is applied on the cover.

Further, as shown in FIG. 3, the maximum liquid level of the liquid stored in the tank 1 is set at an arbitrary position on the shoulder portion of the inner shell 1a (the region having the smallest radius of curvature in the ceiling portion of the inner shell 1a). NS.

The storage portion 2 is a concave space dug in the ground, and both the cross section along the vertical direction and the cross section along the horizontal direction are formed in a rectangular shape.

The inner bottom portion and inner side wall portion of the storage portion 2 formed of the concave space are made of a solid material such as a concrete structure.

Further, the upper opening of the storage portion 2 formed of the concave space is closed by a solid material such as a concrete structure. The solid material that closes the upper opening of the storage unit 2 is the ceiling portion of the storage unit 2. Three holes (reference numerals omitted) are provided in the ceiling portion, and cylindrical pipes 2a, 2b, and 2c are fitted and installed in these three holes, respectively.

The first pipe 2a is arranged so as to surround the supply port 1c and the air port 1e of the tank 1. The second pipe 2b is arranged so as to surround the take-out port 1d, the storage amount detection port 1f, and the liquid leakage detection tube 4a. The third pipe 2a is arranged so as to surround the inspection port 1g.

The first and second pipes 2a and 2b are provided to secure an appropriate work space. The third pipe 2c is provided to secure a passage space when an operator enters and exits the inspection port 1g. The lids 2d, 2e, and 2f are attached to the upper openings of the first to third tubes 2a to 2c so as to be openable and closable, respectively.

The support legs 3 support the tank 1 stored and arranged in the storage portion 2, and are installed on the inner bottom portion of the storage portion 2.

As shown in FIG. 4, the support legs 3 are formed in a cylindrical shape by a metal plate, and a lower flange 3a is provided at the lower end thereof.

The outer diameter dimension of the support leg 3 is set to be the same as or substantially the same as the outer diameter dimension of the peripheral portion of the tank 1. Here, the substantially the same means that an error such as a manufacturing tolerance is included.

The lower flange 3a projects outward in the radial direction. Bolt insertion holes 3b are provided at several locations on the circumference of the lower flange 3a.

In this embodiment, the lower flange 3a is a metal annular plate, and is fixed to the lower end of the support leg 3 by, for example, welding. The lower flange 3a is fixed to the inner bottom surface made of a solid material such as a concrete structure of the storage portion 2.

Further, metal reinforcing plates 3c are provided at several places on the inner peripheral surface of the support legs 3 at equal intervals in the circumferential direction. Further, through holes 3d are provided at least one place in the circumferential direction of the support leg 3, and in this embodiment, four places at equal intervals in the circumferential direction as shown in FIG.

The through hole 3d communicates the outside and the inside of the support leg 3, and is, for example, circular, but its shape is arbitrary.

The liquid leakage detection device 4 detects the leakage of liquid from the inner shell 1a of the tank 1, and is configured to include a liquid leakage detection tube 4a, a sensor 4b, a detection unit 4c, and the like.

The liquid leakage detection tube 4a is inserted along the central axis (vertical direction) in the tank 1, the upper part thereof protrudes outward from the upper part of the tank 1, and the lower opening is the deepest position and the outer side of the inner shell 1a. It is arranged so as to be exposed in the gap facing the shell 1b.

The lower portion of the liquid leakage detection tube 4a is fixed by welding, for example, in a state of being fitted into a through hole (reference numeral omitted) provided at the deepest position of the inner shell 1a.

As shown in FIG. 6, a lid 4d having a large number of through holes is fixed to the lower opening of the liquid leakage detection tube 4a by, for example, welding. The lid 4d is made of, for example, a metal plate, and is fixed to the lower opening of the liquid leakage detection tube 4a by, for example, welding.

Further, on the inner peripheral surface of the inner shell 1a, a reinforcing plate 4e is fixed around the through hole by, for example, welding.

The sensor 4b is housed in the liquid leakage detection tube 4a, and a known float type sensor is used, for example, as shown in FIG.

The output (current value) of the float type sensor as the sensor 4b changes depending on the amount of liquid flowing into the leak detection tube 4a, that is, the height of the liquid level.

As the sensor 4b, in addition to the float type sensor, various known types of sensors can be appropriately selected and used.

The detection unit 4c performs a process of determining the presence or absence of liquid leakage from the inner shell 1a of the tank 1 based on the output from the sensor 4b inserted into the liquid leakage detection tube 4a, and determines that there is a liquid leakage. Occasionally performs alarm processing.

In the determination process, it is determined that there is a liquid leak from the inner shell 1a of the tank 1 when the output (current value) from the sensor 4b becomes equal to or higher than a predetermined threshold value. The threshold value is arbitrarily set.

Further, as the alarm processing, an appropriate form such as a form in which a message is displayed on a display panel (not shown) or a form in which a buzzer is driven to generate an alarm sound can be adopted.

By the way, the upper end of the support leg 3 is straight along a direction (diameter direction) orthogonal to the central axis.

The entire circumference of the upper end of the support leg 3 is joined to a predetermined position on the lower side on the outer peripheral surface of the inner shell 1a. Specifically, as shown in FIG. 5, the joining position is set below the connecting portion between the peripheral portion and the bottom portion of the inner shell 1a.

These joints are referred to as welding in this embodiment, and the welded (joined) portion (also referred to as a weld bead) is designated by reference numeral 8 (see FIG. 5).

As shown in FIG. 5, the outer shell 1b of the tank 1 is adhered to the outside of the joint portion 8 so as to cover it.

The width of the outer shell 1b along the vertical direction of the adhesive region is constant or substantially constant over the entire circumferential direction of the inner shell 1a. Here, the substantially constant means that an error such as a manufacturing tolerance is included.

In this embodiment, the lower edge (see the upper edge 100 of the lower facing gap 7B, the alternate long and short dash line) and the upper edge of the adhesive region of the outer shell 1b adhered so as to cover the joint portion 8 of the support leg 3 with respect to the inner shell 1a. The edge (see the lower edge 200 of the upper facing gap 7A and the alternate long and short dash line) is straightened along the direction orthogonal to the central axis of the tank 1 (the radial direction of the inner shell 1a).

Further, in this embodiment, as shown in FIG. 5, the protective film 3e is adhered to the inner peripheral surface and the outer peripheral surface of the support leg 3 so as to cover the inner peripheral surface and the outer peripheral surface.

The protective film 3e can have the above-mentioned three-layer structure as in the outer shell 1b, but has a two-layer structure in which an FRP layer is sprayed on the bonding target and then a top coat is applied thereto. It is possible to

By the way, as shown in FIG. 5, the non-adhesive facing gap 7A between the inner shell 1a and the outer shell 1b is formed above the joint portion because the entire circumference of the upper end of the support leg 3 is joined to the inner shell 1a. And, below the joint portion, the non-adhesive facing gap 7B between the inner shell 1a and the outer shell 1b becomes discontinuous.

Therefore, a bypass pipe 20 is provided in order to communicate the upper facing gap 7A and the lower facing gap 7B.

The upper opening (one opening) of the bypass pipe 20 is connected to the inner shell 1a so as to be exposed to the upper facing gap 7A, and the lower opening (the other opening) of the bypass pipe 20 is inside the liquid leakage detection pipe 4a. It is connected so as to be exposed to.

Specifically, as shown in FIG. 5, the connection position of the bypass pipe 20 with respect to the inner shell 1a is below the upper facing gap 7A, that is, above the upper edge of the adhesive region of the outer shell 1b covering the joint portion 8. Has been done.

On the other hand, the connection position of the bypass pipe 20 with respect to the liquid leakage detection pipe 4a is the lower end of the liquid leakage detection pipe 4a as shown in FIG. As a result, the bypass pipe 20 is installed so as to be inclined diagonally downward from the upper opening to the lower opening.

The upper opening and the lower opening of the bypass pipe 20 are provided with lids 21 and 22 having a large number of through holes. The lids 21 and 22 are made of, for example, a metal plate, and are fixed to the inner peripheral surface of the bypass pipe 20 by, for example, welding.

In this way, since the upper facing gap 7A is communicated with the lower facing gap 7B via the bypass pipe 20, the upper facing gap 7A and the lower facing gap 7B are continuous. ..

Next, the installation procedure of the tank 1 will be described.

First, the tank 1 is carried into the storage portion 2 in a state of being lifted by a crane (not shown) or the like, and then the support legs 3 connected to the tank 1 are fixed on the inner bottom portion of the storage portion 2.

At this time, after passing the bolt insertion hole 3b of the lower flange 3a of the support leg 3 through the anchor bolt 9 pre-embedded in the inner bottom portion of the storage portion 2, the nut 10 is screwed and mounted on the anchor bolt 9 to fix the anchor bolt 9. do.

If the bolt insertion hole 3b is a long hole that is longer than the diameter dimension of the screw shaft of the anchor bolt 9 and is curved with the same curvature as the outer circumference of the support leg 3, it is assumed that the bolt insertion hole 3b is formed with respect to the anchor bolt 9. When aligning the bolt insertion holes 3b, the tank 1 can be easily aligned by rotating the tank 1 while it is lifted.

After that, the space surrounded by the tank 1, the support leg 3, and the storage portion 2 is filled with the mortar 5 in a fluid state through the through hole 3d of the support leg 3. After the mortar 5 is cured, the space between the storage portion 2 and the tank 1 is filled with a granular member (for example, dry sand, artificial light sand, etc.) 6. The mortar 5 can be changed to the same one as the granular member 6.

As described above, in the underground installation structure of the tank 1 of this embodiment, the tank 1 having a composite double shell structure is vertically placed on the inner bottom portion of the storage portion 2 installed in the ground via the support legs 3. I try to float it up and install it.

Since the upper ends of the support legs 3 are joined to the entire circumference of the lower inner shell 1a of the vertically installed tank 1 at a predetermined position, a composite double shell capable of preventing liquid leakage into the ground is possible. The tank 1 having a structure can be stably installed vertically, and the joint strength of the support legs 3 can be increased as much as possible.

Even if such a joining form is adopted, in the case of the above configuration of the present invention, if the liquid in the inner shell 1a leaks to the upper facing gap 7A due to aging or the like, if it occurs, it may occur. Since the liquid is guided to the lower facing gap 7B via the bypass pipe 20, the liquid leakage can be reliably detected by the liquid leakage detecting device 4.

As a result, the tank 1 having the composite double-shell structure is stably installed vertically in the ground of the narrow site, and the detection operation by the liquid leakage detection device 4 is surely guaranteed.

The upper and lower facing gaps 7A and 7B, which are non-adhesive regions of the outer shell 1b with respect to the inner shell 1a, are filled with a large amount of granular members 6 in the storage portion 2 and the inner shell 5 with the filling of the mortar 5 inside the support leg 3. Although the outer shell 1b is pressed against 1a, if the liquid leaks from the inner shell 1a to the upper facing gap 7A or the lower facing gap 7B as described above, the liquid is bypassed by the capillary phenomenon. It will flow toward the upper opening of the tube 20 and the lower opening of the liquid leakage detection tube 4a. In particular, in the above embodiment, since the bypass pipe 20 is tilted diagonally downward, the liquid flowing into the bypass pipe 20 can easily reach the lower facing gap 7B via the liquid leakage detection pipe 4a. ..

Therefore, it is possible to install the tank 1 having a composite double-shell structure vertically in a stable state in the ground while ensuring the detection operation by the liquid leakage detection device 4. As a result, the tank 1 having a composite double-shell structure can be installed in the ground of a narrow site.

The present invention is not limited to the above embodiment, and can be appropriately modified within the scope of claims and within the scope equivalent to the scope.

(1) In the above embodiment, the number of bypass pipes 20 and the installation location are not particularly limited, and can be arbitrarily set in consideration of, for example, the outer diameter dimension of the tank 1.

(2) In the above embodiment, the liquid supply port 1c, the take-out port 1d, the air port 1e, the storage amount detection port 1f, the inspection port 1g, and the like provided on the ceiling of the tank 1 are not particularly limited. Whether or not it is necessary may be appropriately determined according to the intended use of the tank 1.

(3) In the above embodiment, for example, although not shown, the outer liquid leakage detection device can be installed in a space filled with a large amount of granular members 6 between the storage unit 2 and the tank 1. .. This outer liquid leakage detection device examines whether or not liquid is leaking from the outer shell 1b of the tank 1, and a device having a known configuration can be used.

(4) FIGS. 7 and 8 show other embodiments of the present invention. This embodiment is characterized in that the upper opening of the bypass pipe 20 is formed straight along the radial direction of the tank 1 and is bent diagonally downward from the middle thereof. Other configurations are the same as those in the above embodiment.

In this case, a through hole along the radial direction is formed in the peripheral portion of the inner shell 1a, and the upper opening of the bypass pipe 20 can be fitted straight into the through hole. As a result, the work of opening the through hole in the inner shell 1a and the work of installing the bypass pipe 20 can be easily performed.

Also in this embodiment, the same actions and effects as those in the above embodiment can be obtained.

(5) FIGS. 9 and 10 show other embodiments of the present invention. This embodiment is characterized in that the lower opening of the bypass pipe 20 is connected so as to be exposed to the lower facing gap 7B. Other configurations are the same as those in the above embodiment.

Specifically, the lower opening of the bypass pipe 20 is connected so as to be exposed at a predetermined position near the upper edge in the lower facing gap 7B.

In the case of this embodiment, since the bypass pipe 20 can be shortened as compared with the above embodiment, the occupancy rate of the bypass pipe 20 in the inner shell 1a and the weight of the bypass pipe 20 are smaller than those of the above embodiment. It becomes possible to do.

Also in this embodiment, the same actions and effects as those in the above embodiment can be obtained.

(6) FIGS. 11 and 12 show other embodiments of the present invention. This embodiment is characterized in that four bypass pipes 20 are provided. Other configurations are the same as those in the above embodiment.

Specifically, the bypass pipes 20 are provided at several locations (four locations in the figure) at equal intervals in the circumferential direction of the inner shell 1a. However, the number of bypass pipes 20 installed is arbitrary.

Also in this embodiment, an action and effect comparable to those of the above embodiment can be obtained.

(7) FIG. 13 shows another embodiment of the present invention. In this embodiment, based on the embodiment of FIG. 1, the lower edge of the adhesive region of the outer shell 1b (above the lower facing gap 7B) to be adhered so as to cover the joint portion 8 of the support leg 3 with respect to the inner shell 1a. The edge 100 (see the alternate long and short dash line) is straightened along the direction orthogonal to the central axis 300 of the tank 1 (the radial direction of the inner shell 1a), and the upper edge of the adhesive region (below the upper facing gap 7A). The width along the vertical direction of the adhesive region is increased by inclining the edge 200 (see the two-dot chain line) by a predetermined angle θ with respect to the lower edge of the adhesive region (the upper edge 100 of the lower facing gap 7B). It is characterized in that it is narrowed to the lower side of the connection position of the upper opening of the bypass pipe 20 with respect to the inner shell 1a, and is gradually widened from the narrowest position toward a position facing 180 degrees. Other configurations are the same as those in the above embodiment.

Then, as shown in FIGS. 1 and 5, the upper opening of the bypass pipe 20 is connected to the lowest position in the lower edge 200 of the inclined upper facing gap 7A. On the other hand, the lower opening of the bypass pipe 20 is connected to the lower end position of the liquid leakage detection pipe 4a as shown in FIG.

In addition, lids 21 and 22 having a large number of through holes are attached to the upper opening and the lower opening of the bypass pipe 20. The lids 21 and 22 are made of, for example, a metal plate, and are fixed to the inner peripheral surface of the bypass pipe 20 by, for example, welding.

In the case of such an embodiment, if the liquid in the inner shell 1a leaks to the upper facing gap 7A, the leak position of the liquid may be anywhere on the peripheral portion of the inner shell. , The liquid is quickly guided to the lowest position (the deepest position of the tank 1) in the lower facing gap 7B.

As a result, even if the liquid in the inner shell 1a leaks from any position in the peripheral portion of the inner shell 1a to the upper facing gap 7A, this liquid leakage is detected by the liquid leakage detection device 4 at a relatively early stage. Will be possible.

The feature configuration described in this embodiment can be applied to all other embodiments of the present invention except for the embodiments shown in FIGS. 11 and 12.

(8) FIGS. 14 to 16 show other embodiments of the present invention. This embodiment is characterized in that the bypass pipe 20 is installed horizontally. Other configurations are the same as those in the above embodiment.

Specifically, the bypass pipe 20 is arranged so as to be in a posture along a direction orthogonal to the central axis 300 of the tank 1 (diameter direction of the inner shell 1a).

The lower end of one opening of the bypass pipe 20 is adhered so as to cover the joint portion 8 of the support leg 3 with respect to the inner shell 1a. It is located below the dotted line).

As a result, if the liquid in the inner shell 1a leaks into the facing gap 7A on the upper side, this liquid can easily enter the bypass pipe 20 quickly. Therefore, the liquid that has entered the bypass pipe 20 is quickly guided to the lowest position (the deepest position of the tank 1) in the lower facing gap 7B, and this liquid leakage is detected at a relatively early stage. 4 makes it possible to detect.

The upper edge of the adhesive region (lower edge 200 of the upper facing gap 7A) may be aligned in a direction orthogonal to the central axis 300 of the tank 1, and as shown in FIG. 13, the tank may be provided. It may be inclined by a predetermined angle with respect to the direction orthogonal to the central axis 300 of 1.

According to this embodiment, the manufacturing of the bypass pipe 20 and the installation work thereof are simpler than in the case where the bypass pipe 20 is tilted diagonally downward as in the above embodiment, which contributes to the reduction of equipment cost. can.

INDUSTRIAL APPLICABILITY The present invention can be suitably used for a tank for stable installation in a vertical position in the basement of a narrow site. Further, the present invention can be suitably used for a structure for stably installing a tank vertically in the basement of a narrow site and enhancing the reliability of liquid leakage detection.

1 tank
1a inner shell
1b outer shell
2 Storage unit
3 Support legs
3a Lower flange
3d through hole
4 Liquid leak detection device
4a Liquid leak detector tube
4b sensor
4c detector
5 mortar
6 Granular member
7A Upper facing gap
7B Lower facing gap
8 Joint part 20 Bypass pipes 21 and 22 Lid 100 Upper edge of lower facing gap 200 Lower edge of upper facing gap

Claims (8)

A tubular tank with both ends closed in the longitudinal direction.
A metal inner shell in which a liquid is stored and a non-adhesive region covered from the inner shell so as to cover the entire inner shell from a predetermined position on at least one end side in the longitudinal direction to the other end side in the longitudinal direction. It has a composite double-shell structure that includes an outer shell made of synthetic resin.
On the other end side of the inner shell in the longitudinal direction, a metal support leg for installing the tank vertically on the inner bottom of a storage portion provided in the ground is attached.
The support legs are formed in a tubular shape, and the entire circumference of the upper end thereof is joined to a predetermined position on the outer peripheral surface of the inner shell toward the other end in the longitudinal direction.
The outer shell is adhered to the outside of the joint portion so as to cover it.
A liquid leak detection device for detecting a liquid leak from the inner shell is installed in the inner shell.
This liquid leakage detection device is inserted into the vertically placed inner shell along the vertical direction, the upper portion protrudes outward from one end side in the longitudinal direction of the tank, and the lower opening is the longitudinal length of the inner shell. A liquid leakage detection tube arranged so as to be exposed in the gap between the deepest position on the other end side in the direction and the outer shell, and a liquid inserted into the liquid leakage detection tube and flowing into the liquid leakage detection tube are detected. Equipped with a sensor,
The non-adhesive facing gap between the inner shell and the outer shell above the joint portion and the non-adhesive facing gap between the inner shell and the outer shell below the joint portion communicate with each other by a bypass pipe. A tank characterized by being. In the tank according to claim 1,
One opening of the bypass pipe is connected to the inner shell so as to be exposed near the lower edge of the upper facing gap.
A tank characterized in that the other opening of the bypass pipe is connected to the liquid leakage detection pipe so as to be exposed inside. In the tank according to claim 2.
The bypass pipe is installed so as to be inclined diagonally downward from one opening to the other.
The other opening is a tank characterized in that it is connected to the lower end of the liquid leakage detection tube. In the tank according to claim 2.
The bypass pipe is formed so as to extend in a straight line from the one opening to the other opening, and is installed so as to be in a posture perpendicular to the central axis of the tank. tank In the tank according to claim 1,
One opening of the bypass pipe is connected to the inner shell so as to be exposed near the lower edge of the upper facing gap.
A tank characterized in that the other opening of the bypass pipe is connected to the inner shell so as to be exposed in the lower facing gap. In the tank according to any one of claims 2 to 5,
The lower edge of the adhesive region of the outer shell (upper edge of the lower facing gap) with respect to the joint portion is straightened along the radial direction of the inner shell, and the upper edge of the adhesive region (upper facing). The lower edge of the gap) is tilted by a predetermined angle with respect to the lower edge of the adhesive region so that the width of the adhesive region along the vertical direction is below the connection position of one opening of the bypass pipe to the inner shell. The tank is characterized in that it is narrowed in and gradually widened from the narrowest position toward a position facing 180 degrees. In the tank according to any one of claims 1 to 6,
A tank characterized in that at least one position in the circumferential direction of the support leg is provided with a through hole for communicating the inside and the outside of the support leg. The tank according to any one of claims 1 to 7 is vertically stored and arranged inside a storage unit provided in the ground.
The space surrounded by the inner bottom surface of the storage portion, the outer surface on the other end side in the longitudinal direction of the tank, and the inner peripheral surface of the support leg is filled with mortar or a large amount of granular members. Underground installation structure.

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