JPH08326067A - Fixing device for underground tank - Google Patents

Abstract

PURPOSE: To improve durability and a lifetime by fixing an underground tank onto a foundation under a stable state. CONSTITUTION: A foundation 12 as a sill section for the fixing device 11 of an underground tank is formed in a plate shape from reinforced concrete. The underground tank 5 is placed on the foundation 12, and each clamping band 13 is wound on the outer circumferential side of the underground tank 5 so as to be clamped. The intermediate sections 13A of each clamping band 13 are wound on the underground tank 5, and end sections 13B on both sides are fastened to each anchor bolt 13C fixed onto the foundation 12. A periphery on the bottom section 5A side of the underground tank 5 is filled compactly with a banking layer 14, with which a solidifying agent is mixed previously, so as to bury a clearance between a bottom section 5A and the foundation 12 and the banking layer 14 is solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for an underground tank, which is suitable for fixing an oil storage tank or the like buried underground in a gas station on a foundation.

[0002]

2. Description of the Related Art Generally, in a gas station, etc., before the underground tank (oil storage tank) for storing oil liquid such as gasoline is buried in the underground tank of the gas station, the underground tank is fixed by a fixing device or the like. I am trying to fix it on top.

Therefore, a conventional underground tank fixing device of this type will be described with reference to FIGS. 6 to 10 by taking as an example the case where it is used for an underground tank of a gas station.

In the figure, reference numeral 1 denotes a site of a gas station, the site 1 is covered with a concrete paving surface 2, and a base 3 described later is formed in the basement of the paving surface 2 and on the base 3. An underground tank 5 is installed via the pedestals 4 and 4.

Reference numeral 3 denotes a foundation on which an underground tank 5 is installed. The foundation 3 is formed of, for example, reinforced concrete into a flat plate shape to become a base portion at the installation location of the underground tank 5, and each of the foundations 3 is The pedestal 4 is integrally formed,
An underground tank 5 is installed via each pedestal 4.

Reference numerals 4 and 4 denote, for example, two pedestals formed on the foundation 3. Each of the pedestals 4 is integrally formed on the foundation 3 in the form of a prism, for example, of reinforced concrete. And extends in a direction crossing the underground tank 5. Then, on the upper side surface 4A of each pedestal 4, as shown in FIG. 7, a substantially arcuate recess 4B for receiving the underground tank 5 is formed in the longitudinal direction. Further, each anchor bolt 6C for fixing a tightening band 6 described later is fixed to the upper side surface 4A in a state where a tip portion thereof is projected.

Reference numeral 5 denotes an underground tank buried underground on the pavement surface 2. The underground tank 5 is formed as a substantially cylindrical closed container by welding (making) a plurality of steel plates or the like, It is installed on each pedestal 4 between the paved surface 2 and the foundation 3. Here, in the underground tank 5, as shown in FIG. 6, the bottom 5A side is fitted into the recess 4B of each pedestal 4, and each tightening band 6 is wound around the outer peripheral side. Further, the end portions 5B, 5B on both longitudinal ends of the underground tank 5 are formed in a convex curved shape so as to increase the strength. Then, an oil liquid such as gasoline is stored in the underground tank 5, and the oil liquid enters and is shipped into the underground tank 5 from the manhole 8 side described later.

Reference numerals 6 and 6 denote two tightening bands for fixing the underground tank 5 on each pedestal 4, and each tightening band 6 is formed into a band shape by, for example, a steel band or the like, and an intermediate portion 6A thereof is formed in the underground tank 5. Is wound around the outer peripheral side of. Then, both ends 6B, 6B (only one shown) of both sides of each tightening band 6 are inserted with each anchor bolt 6C fixed to each pedestal 4, and each nut 6 is attached to each anchor bolt 6C.
By fixing D, it is fixed on the foundation 3.

[0009] Reference numerals 7, 7, ... Show a plurality of columns (only two are shown) erected between the foundation 3 and the pavement surface 2. Each of the columns 7 is made of, for example, reinforced concrete or the like, and is an underground tank. 5, the pavement surface 2 is supported from the lower side with high strength by being spaced apart from the front, rear, left, and right.

Reference numeral 8 denotes a manhole whose lower end side is disposed on the upper surface side of the underground tank 5 and whose upper end side is open to the paved surface 2 side, and the open end of the manhole 8 is covered by a lid 8A,
For example, by opening the lid 8A at the time of regular inspection,
Check the pipes 8B, 8B, ... Inside the manhole 8. Here, each of the pipes 8B constitutes an oil liquid injecting pipe, an oil supply pipe, etc., and is used to carry the oil liquid into and out of the underground tank 5 from the ground. A sand layer 9 is filled between the foundation 3 and the paved surface 2, and an underground tank 5 or the like is buried in the sand layer 9.

The fixing device for the underground tank 5 according to the prior art has the above-mentioned structure, and then its construction (construction)
Describe the work procedure.

First, for example, a buried hole for an underground tank 5 is excavated in a site 1 of a gas station, a foundation 3 made of reinforced concrete is formed on the bottom side thereof, and columns 7 are erected. Then, a plurality of pedestals 4 made of concrete are formed on the foundation 3 in a separate process, and a concave portion 4 having a concave curved shape on the upper side surface 4A of each pedestal 4 corresponding to the bottom portion 5A side of the underground tank 5.
Form B. A rubber sheet or the like may be laid on the recess 4B to protect the outer peripheral surface of the bottom 5A of the underground tank 5 and the like. Further, on both end sides in the length direction of each pedestal 4,
The lower end side of each anchor bolt 6C is embedded and fixed at a position away from the recess 4B.

Next, the underground tank 5 is lifted by a device such as a crane, and the recesses 4 of each pedestal 4 formed on the foundation 3 are lifted.
Place it so that it fits in B. Then, with each tightening band 6 wound around the outer peripheral side of the underground tank 5, each end 6B thereof is fixed to each anchor bolt 6C fixed to each pedestal 4 by using each nut 6D, Firmly tighten 5 on foundation 3. After that, the sand layer 9 is filled around the underground tank 5 and the like, and the pavement surface 2 is formed to bury the underground tank 5.

[0014]

By the way, in the above-mentioned conventional technique, each pedestal 4 is provided on the foundation 3, and each pedestal 4 is formed with a concavely curved concave portion 4B, so that it is a rigid basement. Since the tank 5 is configured to be supported on each pedestal 4 via the recess 4B, high dimensional accuracy is required for the size and position of each pedestal 4 formed on the base 3 and the shape of the recess 4B. Especially when burying a large underground tank or an underground tank whose surface is protected by resin, for example, a biased load is applied to the main body or surface of the underground tank 5, or stress concentration occurs. Then, highly accurate construction is required for each pedestal 4 so as not to distort the underground tank 5 or damage the surface.

Therefore, there is a problem that the number of man-hours and the time required for forming each pedestal 4 increase, the construction period is extended, and the economical efficiency deteriorates.

Further, since there is a limit to the period of the burial work, and it takes a lot of time to form each pedestal 4, it may not be possible to secure sufficient construction accuracy for each pedestal 4. In that case, Cause problems.

That is, as shown in FIG. 8, the left and right pedestals 4 are provided.
When the recesses 4B of the pedestals 4 are formed so as to be displaced in the lengthwise direction of the pedestals 4 (directions of the arrows A and B), the underground tank 5 is formed by the recesses 4B of the pedestals 4 in the directions of arrows A and B. Bending loads opposite to each other are applied to. As a result, the underground tank 5 is installed between the pedestals 4 in a slightly distorted state in the directions A and B (or in a state where stress is locally concentrated on the outer peripheral surface). There is a problem that the durability of the underground tank 5 is reduced and the life thereof is shortened, and the seismic resistance is reduced by being installed in an unstable state.

Further, as shown in FIGS. 9 and 10, the height of each of the plurality of pedestals 4 and the recess 4B of each pedestal 4 are set.
Even if the shape (depth) of the
On the other hand, the underground tank 5 is inclined or the outer peripheral surface of the underground tank 5 is distorted, so that the underground tank 5 is installed in an unstable state.

For example, when the shape of the recess 4B of the pedestal 4 is different from the curvature of the outer peripheral surface of the underground tank 5, the underground tank 5 is in an unstable state due to point contact or line contact with the recess 4B of each pedestal 4. By fitting, the load (stress) is locally concentrated on the outer peripheral surface of the underground tank 5, the surface is distorted and damaged, the installation state of the underground tank 5 becomes unstable, and the seismic resistance is improved. There is a problem of decrease.

The present invention has been made in view of the above-mentioned problems of the prior art, and firmly fixes the underground tank on the foundation in a stable state without distorting the underground tank or locally concentrating the stress. It is an object of the present invention to provide a fixing device for an underground tank, which is capable of improving durability and life.

[0021]

In order to solve the above-mentioned problems, the structure adopted by the present invention is an underground tank fixing device in which an underground tank is installed and fixed on a foundation provided underground. On the foundation, a fastening band having an intermediate portion wound around the outer peripheral side of the underground tank and both end sides fixed to the foundation, and an embankment that is partially filled at least around the bottom side periphery of the underground tank The embankment part for filling the gap between the base and the foundation is provided, and the embankment part is solidified with a solidifying agent.

[0022]

With the above structure, the gap between the bottom side periphery of the underground tank and the foundation is filled with the embankment portion. Therefore, when the embankment portion is solidified with the solidifying agent, the embankment portion is surrounded by the bottom side periphery of the underground tank. At the base part that supports the underground tank at
The underground tank can be fixed to the foundation in a stable state.

Further, since the embankment portion that fills the gap between the bottom side periphery of the underground tank and the foundation has a shape that is completely along the outer peripheral surface of the underground tank, the embankment portion covers the entire bottom portion of the underground tank. The embankment allows the underground tank to be uniformly supported from the bottom side.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In addition, in the present embodiment, the same components as those of the conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 11 denotes a fixing device for an underground tank according to this embodiment, and the fixing device 11 for the underground tank is shown.
Is a foundation 12, a tightening band 13, and an embankment layer 1 which will be described later.
It is composed of 4 and 4.

Reference numeral 12 denotes a foundation which is a base portion of the fixing device 11 for the underground tank. The foundation 12 is the same as in the prior art.
For example, although it is formed in a flat plate shape from reinforced concrete or the like, a pedestal or the like is not formed on its upper side surface 12A, and both end sides 1 of each tightening band 13 are formed on the upper side surface 12A.
Each anchor bolt 13C for fixing 3B is fixed with its tip end protruding.

Reference numerals 13 and 13 denote, for example, two tightening bands wound around the outer peripheral side of the underground tank 5, and each tightening band 13 has substantially the same structure as the tightening band 6 of the prior art. The length dimension is slightly longer than that of the tightening band 6. As shown in FIG. 2, each tightening band 13 has an intermediate portion 13A wound around the outer peripheral surface of the underground tank 5, and the end portions 13B and 13B on both sides are fixed to the foundation 12 by anchor bolts 13C. In the inserted state, each anchor bolt 13C is attached to each nut 13D.
Is fastened. Thereby, each tightening band 13
Is wound on the outer peripheral side of the underground tank 5 with tension, and the underground tank 5 is firmly fixed on the foundation 12.

Reference numeral 14 designates an embankment layer as an embankment portion which is embeded around the bottom 5A side of the underground tank 5, and the embankment layer 14
Is formed into a substantially trapezoidal shape from, for example, excavated soil suitable for using a solidifying agent. Further, the embankment layer 14 is embankd so as to sandwich the periphery of the bottom 5A side of the underground tank 5 from the front, rear, left, right, etc., in order to fill the gap between the bottom 5A of the underground tank 5 and the foundation 12. The space is densely filled, and the tank support surface 14A of the embankment layer 14 is the bottom portion 5 of the underground tank 5.
It is in a state of being in close contact with the bottom portion 5A around the A side. The embankment layer 14 is previously solidified (for example, a mixture of soil cement consisting of cement and excavated soil and quick lime)
Is solidified by being mixed, and the underground tank 5 is used as a foundation 1
It is formed with sufficient hardness (strength) as a pedestal portion that is supported on the roll 2 in a rolling prevention state.

Fixing device 11 for underground tank according to this embodiment
Has the configuration as described above, and the procedure of the construction work will be described below with reference to FIGS. 3 and 4.

First, the foundation 12 is formed almost in the same manner as in the prior art, and at the time of forming the foundation 12, each anchor bolt 13C is embedded and fixed at a predetermined position in a state where the tip end side is projected. Then, after the foundation 12 is solidified, the underground tank 5 is lifted up by using a rope 15 such as a wire rope with a crane or the like as shown in FIG.
Place it in the specified position above.

Next, as shown in FIG. 4, with each tightening band 13 wound around the outer peripheral side of the underground tank 5, each end 13B thereof is fixed to each anchor bolt 13C fixed on the foundation 12. To do. Thereby, each tightening band 13 tightens the underground tank 5 on the foundation 12 with tension.

Next, for example, earth and sand mixed with a solidifying agent (excavated soil) is densely filled in the gap between the bottom portion 5A of the underground tank 5 and the foundation 12 so that the embankment layer 14 is substantially supported. Form into a shape. As a result, the underground tank 5 is firmly fixed on the foundation 12 as shown in FIGS. 1 and 2.

Thus, according to this embodiment, the embankment layer 14 is provided around the bottom 5A of the underground tank 5 installed on the foundation 12.
And the bottom portion 5A of the underground tank 5 is provided by the embankment layer 14.
The gap between the foundation and the foundation 12 is closely filled, and the embankment layer 1
4 is set with a solidifying agent, the embankment layer 14
The tank support surface 14A is fitted so as to be in close contact with the underground tank 5, and the embankment layer 14 is used as a base for the underground tank 5.
2 can be formed with sufficient hardness (strength) as a pedestal part to be supported on 2 and together with each tightening band 13 the underground tank 5
Can be firmly fixed on the foundation 12. As a result, the durability of the underground tank 5 can be effectively enhanced, and the underground tank 5 can be buried in a stable state for a long period of time, so that the life of the underground tank 5 can be significantly extended and the gas station It is possible to reliably store the oil liquid in a safe state.

In addition, the underground tank 5 is firmly fixed by each tightening band 13 so as not to float up from the foundation 12, and the embankment layer 14 is filled around the bottom portion 5A side without any gaps. Since there is no sand layer 9 or the like with the foundation 12, even if the sand layer 9 (see FIG. 6) around the underground tank 5 is liquefied due to an earthquake or the like, the underground tank 5 can be prevented from rising from the foundation 12. The safety of the underground tank 5 in the event of a disaster such as an earthquake can be significantly increased.

Then, the embankment layer 14 is densely filled in the gap between the periphery of the bottom 5A of the underground tank 5 and the foundation 12, and the tank support surface 14A of the embankment layer 14 is the bottom 5A of the underground tank 5.
Since it is in close contact with the bottom portion 5A around the side,
The tank support surface 14A has a shape that is completely along the outer peripheral surface of the bottom portion 5A of the underground tank 5, and the embankment layer 14 extends through the entire bottom portion 5A of the underground tank 5 to the bottom portion 5A.
It can be uniformly supported and fixed from the A side. As a result, the load (stress) can be fixed to the underground tank 5 without locally concentrating the load, so that the durability of the underground tank 5 can be significantly improved. Further, for example, when the underground tank 5 vibrates due to an earthquake or the like, it is possible to avoid local friction (collision) between the underground tank 5 and the foundation 12 or the like and damage, so that the underground tank 5
The safety and reliability of can be significantly improved.

Further, the embankment layer 14 provided around the bottom portion 5A of the underground tank 5 is solidified with a solidifying agent to form a pedestal portion for supporting the underground tank 5, so that the underground tank 5 can be used as a base 1
Since it can be fixed to 2, the underground tank 5 can be easily formed without forming a precise pedestal on the foundation 12 in advance.
Can be fixed on the foundation 12, the period for burying the underground tank 5 can be shortened, and the step of forming the pedestal portion can be simplified. As a result, it is possible to reduce the cost of the burial work, reduce the possibility that a deficiency in the work will occur, and reliably improve the reliability of the burial work.

In the above embodiment, the embankment layer 14
Was formed so as to completely fill the periphery of the bottom 5A side of the underground tank 5, but the present invention is not limited to this, and for example, the periphery of the bottom 5A side is circumferentially (front-rear direction) except for both ends in the longitudinal direction of the underground tank 5. You may form the embankment part so that it may be pinched | interposed.
In addition, a plurality of embankment portions may be formed in the longitudinal direction of the underground tank 5 so as to be spaced apart from each other, similar to the pedestal 4 described in the related art. The embankment layer 14 can be formed to have an arbitrary thickness around the underground tank 5, for example, from the foundation 12 to the underground tank 5 around the underground tank 5.
You may form the embankment part to the upper end or the middle part.

Further, in the above-mentioned embodiment, the bottom portion 5A of the underground tank 5 is mixed with the excavated soil or the like in advance with a mixture type solidifying agent (for example, a mixture of soil cement and quick lime consisting of cement and excavated soil or the like). Although it has been described that the embankment layer 14 is formed by embedding it in the surroundings, the present invention is not limited to this, and for example, excavated soil or the like is embedding to form the embankment layer 14, and then a solidifying agent is injected to fill the embankment. The layer 14 may be solidified.

On the other hand, in the above-mentioned embodiment, the number of the tightening bands 13 for tightening the underground tank 5 on the foundation 12 is, for example, two, but the present invention is not limited to this, and the tightening band 13 may be used if necessary. The number may be one or three or more.

Further, in the above-mentioned embodiment, the underground tank 5 is a substantially cylindrical hermetic container made of, for example, a steel plate, but the present invention is not limited to this, and for example, as in a modification shown in FIG. The bottom 5A 'side of the underground tank 5', whose end portions 5B 'on both ends in the longitudinal direction are flat, may be positioned and fixed by the embankment layer 14'. Also, underground tank 5
May be an underground tank having a double shell structure or the like, or may be an underground tank having a double shell structure in which an inner shell made of a steel plate or the like is formed with an outer shell made of a resin material or the like.

Furthermore, in the above-described embodiment, the case where the fixing device 11 for the underground tank is applied to the underground tank 5 buried underground such as a gas station has been described as an example, but the application of the present invention is not The present invention is not limited to this, and it can be applied regardless of its use as long as it is an underground tank that is used underground. For example, it may be applied to a water storage tank buried underground.

[0042]

As described in detail above, according to the invention described in claim 1, the gap between the bottom side periphery of the underground tank and the foundation is filled with the embankment and solidified by the solidifying agent. The embankment part is a pedestal part that supports the underground tank around the bottom side of the underground tank, and the fastening bands that are fixed to the foundation at both ends are wound around the underground tank with tension from the outer peripheral side, so that the underground tank Can be firmly fixed to the foundation in a stable state.
As a result, the durability of the underground tank can be significantly increased, the underground tank can be buried in a stable state for a long time, and the reliability thereof can be significantly improved.

Further, the embankment part, which is densely filled and solidified in the gap between the bottom side periphery of the underground tank and the foundation, adheres evenly to the outer peripheral surface of the bottom part of the underground tank, for example, all over. If formed, the embankment portion evenly supports the underground tank as a pedestal portion from the bottom side to the entire bottom, so that it can be fixed to the underground tank without locally concentrating the load (stress). it can. This allows
For example, when the underground tank vibrates due to an earthquake or the like, it is possible to avoid local friction (collision) between the underground tank and the foundation, etc., and damage, thus significantly improving the safety and reliability of the underground tank. You can

Since the embankment portion is provided around the bottom side of the underground tank and is solidified with the solidifying agent, the underground tank can be easily fixed on the foundation without forming a pedestal or the like on the foundation in advance. The burial period can be shortened and the process of installing the underground tank on the foundation can be simplified. As a result, it is possible to reduce the cost of the burial work, reduce the possibility that a deficiency in the work will occur, and reliably improve the reliability of the burial work.

[Brief description of drawings]

FIG. 1 is a front view showing a fixing device for an underground tank according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1 showing a fixing device for an underground tank.

FIG. 3 is a process explanatory view showing a state before the underground tank is placed on the foundation.

FIG. 4 is a process explanatory view showing a state in which an underground tank is fixed on a foundation by a tightening band.

FIG. 5 is a front view showing a fixing device for an underground tank according to a modification.

FIG. 6 is a cross-sectional view showing an underground tank of a gas station according to the related art.

FIG. 7 is a perspective view showing a fixing device for an underground tank according to the related art.

FIG. 8 is a plan view showing a state in which a bending load is applied to the underground tank.

FIG. 9 is a front view showing a state in which the underground tank is tilted.

FIG. 10 is a front view showing a state in which the underground tank is distorted.

[Explanation of symbols]

 5,5 'Underground tank 5A, 5A' Bottom part 11 Underground tank fixing device 12 Foundation 13 Tightening band 13A Intermediate part 13B End part (both ends) 14,14 'Fill layer (fill part)

Claims (1)

[Claims] 1. An underground tank fixing device for installing and fixing an underground tank on a foundation provided underground, wherein an intermediate portion is wound around an outer peripheral side of the underground tank and both end sides are formed on the foundation. Providing a tightening band fixed to the foundation and an embankment portion that fills the gap between the underground tank and the foundation so as to partially sandwich at least the bottom side periphery of the underground tank, and solidifies the embankment portion with a solidifying agent. An underground tank fixing device characterized by being configured to