JP3375910B2 - Structure of protector in installation of underground tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a protector for temporarily containing liquids such as gasoline, kerosene, light oil, and heavy oil that are accidentally leaked from a liquid supply port in the upper part of an underground tank when refueling. It concerns the structure of the protector in the installation of an underground tank. More specifically, rainwater, sand particles, etc. that enter through the manhole cover gap
The present invention relates to the structure of a protector in an underground tank installation that can prevent foreign matter such as mud from accumulating inside the protector.

[0002]

2. Description of the Related Art Conventionally, as a structure of a protector in the installation of an underground tank of this type, for example, a structure shown in FIG. 4 has been known. Taking this case as an example, the protector 41 is formed in a cylindrical shape with a bottom, and is provided so as to project above the directly buried underground oil tank main body 42 that is formed in a horizontal cylindrical shape to supply the oil 61. It is arranged so as to surround the upper portion of the manhole portion 44 provided with the fuel filler port 43. Further, at the joints between the protector 41 and the manhole portion 44 and the oil pipe 45, the oil 61 is prevented from leaking to the soil 62 outside the protector 41, and the soil 62 is prevented.
A welded portion 46 or a caulking portion 46a is provided to prevent moisture inside from entering the protector 41.

An upper slab 47 is formed of concrete above the underground oil tank body 42, and a manhole 48 having a circular hole is vertically formed in the upper slab 47. This manhole 4
At the upper end of 8, a lid receiver 49 formed in a substantially annular shape is arranged close to the upper edge of the protector 41 with a slight gap, and the lid receiver 49 is provided.
The manhole cover 50, which is formed in a substantially disc shape, supports the manhole 48 so that the manhole 48 can be opened and closed.

The manhole cover 50 constitutes a substantially disc-shaped manhole cover 50a arranged in the center thereof and a peripheral portion of the manhole cover 50, and the manhole cover 50a is formed.
And a manhole outer lid 50b for supporting the. Further, a rubber waterproof packing 5 is provided on the outer peripheral surface of each manhole inner lid 50a and manhole outer lid 50b.
1 is fitted to prevent the rainwater 63 from flowing into the protector 41.

Then, with the manhole inner cover 50a removed from the manhole outer cover 50b, an oil refilling hose (not shown) is connected to the refueling port 43, so that the oil 61 can be refilled into the underground oil tank body 42. . On the other hand, when the oil 61 is accidentally spilled from the oil supply port 43 at the time of refueling the oil 61, the oil 61 is temporarily stored in the protector 41 and is stored in the soil 62 outside the protector 41. Leakage can be prevented.

When removing the oil 61 contained in the protector 41, the manhole cover 50 is used.
The inside of the protector 41 can be cleaned by inserting an oil suction hose (not shown) into the protector 41 with the cover removed from the lid receiver 49, sucking the spilled oil 61, or wiping it off with a cloth (not shown). .

[0007]

However, in the structure of the protector in the installation of the conventional underground tank, the waterproof packing 51 of the manhole inner lid 50a and the manhole outer lid 50b is deteriorated due to long-term use, or When the lids 50a and 50b were opened and closed, the surface of the waterproof packing 51 was sometimes scratched by sand particles, mud, or the like. In such a case, a gap is formed in the waterproof packing 51, and the waterproof performance cannot be sufficiently exhibited.

At this time, as indicated by the arrow in FIG.
Rainwater 63 entered from the outside through the gap of the waterproof packing 51 and was accumulated in the protector 41.
Therefore, the rainwater 6 stored in the protector 41
3 may corrode the manhole part 44, the oil pipe 45, and the like, and may damage a sensor such as an oil level gauge (not shown) provided in the manhole part 44. Further, when the refueling port 43 is submerged by the rainwater 63 in the protector 41, the underground oil tank body 4 passes through the refueling port 43.
There was also a possibility that rainwater 63 would enter the inside of 2.

The present invention has been made by paying attention to the problems existing in the prior art as described above. It is an object of the invention to provide a structure of a protector for installing an underground tank, which can prevent foreign matter from entering the protector.

[0010]

In order to achieve the above object, the structure of the protector in the installation of the underground tank according to the invention of claim 1 is provided with a manhole cover for opening and closing the manhole, and the manhole. An underground tank is buried below the lid, and a liquid supply port or liquid supply pipe for supplying the liquid stored in the underground tank is provided at the upper end of the underground tank, and the liquid supply port or the liquid is supplied. Surrounding the supply pipe, a protector for preventing the infiltration of soil around it is provided, and an underground tank configured to temporarily store the liquid leaked from the liquid supply port or the liquid supply pipe in the protector. A structure of a protector for installation, wherein a lid for opening and closing the protector is provided at an upper opening of the protector. Provided with, between the manhole and the protector forms a gap for discharging the foreign substance entering through the gap manhole cover into the surrounding soil, and the manhole cover and the lid in a lid body, respectively Outer lid
And the outer diameter of the inner lid of the lid body of the manhole lid
It is formed to be smaller than the outer diameter of the inner lid .

The structure of the protector in the installation of the underground tank according to the second aspect of the present invention is the structure of the first aspect, wherein the outer diameter of the lid is the outer diameter of the manhole lid.
The outer diameter is smaller than the outer diameter.

The structure of the protector in the installation of the underground tank of the invention according to claim 3 is the structure according to claim 1 or 2.
In the invention described in (1), the protector is formed by reducing the diameter of the upper part.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the underground tank 11 is entirely made of steel or fiber reinforced plastic (F
RP) to form a substantially horizontal cylinder. The underground tank 11 is composed of an underground tank main body 12 placed on an upper part of a reinforced concrete foundation slab (not shown), and a cylindrical manhole 13 with a lid protruding from the upper end of the underground tank main body 12. ing. further,
At a lateral position of the underground tank 11, a plurality of columns (not shown) made of reinforced concrete are erected from the foundation slab so as to surround the underground tank 11. The underground tank 11 shows an example of a direct-burying type installation structure.

An oil supply port 14 for supplying oil 31 into the underground tank body 12 is provided at the upper end of the manhole portion 13 so as to project the oil 31 stored in the underground tank body 12. An oil pipe 15 is provided for supplying each facility (not shown) through the underground.
The oil pipe 15 includes a base end portion that is provided so as to project upward from the manhole portion 13 and is then bent in the horizontal direction, and a linear oil pipe 15 that is disposed toward each of the facilities. By joining at the joining portion 15a, the oil pipe 1
5 is arranged so that it can be easily arranged.

A protector 16 formed of a steel material in a substantially cylindrical shape having a bottom is provided on the upper portion of the manhole portion 13 so as to surround the manhole portion 13, the oil supply port 14 and the oil pipe 15. This protector 16
Oil 31 accidentally leaked from the fuel filler port 14 when refueling, etc.
Is configured to be temporarily accommodated.

Further, the manhole portion 13 and the oil pipe 1
5 and the protector 16 are welded to each joint 17
Alternatively, the caulking portion 17a is provided. The welded portion 17 and the caulking portion 17a can prevent the oil 31 temporarily stored in the protector 16 from leaking into the soil 32 outside, and the moisture and sand particles in the soil 32 can be prevented. , Mud and the like can be prevented from entering the protector 16.
The upper opening 16a of the protector 16 has a reduced diameter.

As shown in FIGS. 1 and 2, the upper opening 16a of the protector 16 is provided with a protector outer lid 18 and a protector inner lid 19 as protector lids made of thin stainless steel. The upper opening 16a of the protector 16 is closed so that it can be opened and closed.

As shown in FIG. 1, a protector outer cover 18 is provided.
Is an annular plate-shaped inclined portion 18a inclined so as to become lower toward the outside, a cylindrical lower engagement protrusion 18b hanging along the outer peripheral edge of the inclined portion 18a, and an inside of the inclined portion 18a. The upper engaging protrusion 18c is provided upright along the peripheral edge. The lower engagement protrusion 18b is configured to close the protector 16 by engaging with the upper opening 16a of the protector 16.

The protector inner lid 19 is formed in a cylindrical shape with a lid, and the lower engaging protrusion 1 extends along the outer peripheral edge thereof.
9a is hanging. Then, the lower engaging protrusion 19
a is an upper engaging protrusion 18c of the protector outer lid 18.
The outer cover 18 of the protector can be closed by engaging with.

On the other hand, above the underground tank 11, there is provided an upper slab 21 made of reinforced concrete supported by a foundation slab via a plurality of columns (not shown), and the upper slab 21 serves as a boundary between the ground and the underground. Are formed. A circular hole-shaped manhole 22 is vertically formed in the upper slab 21 located above the protector 16, and an upper opening 16a of the protector 16 is inserted in a lower position of the manhole 22. It is arranged.

Further, a predetermined gap 22a is provided between the outer peripheral surface of the protector 16 and the inner peripheral surface of the lower end portion of the manhole 22.
The foreign substances such as rainwater, sand grains, and mud that have entered the manhole 22 are discharged into the surrounding soil 32 through the gap 22a. The width of this gap 22a is preferably 20 to 30 mm.
Is. If the gap 22a is less than 20 mm, when a large amount of rainwater enters, there is a possibility that the rainwater cannot be efficiently permeated into the soil 32 and discharged. On the contrary, when the gap 22a exceeds 30 mm, the inner diameter of the manhole 22 is unnecessarily increased, which is not preferable.

On the other hand, at the upper end portion of the manhole 22, a lid receiver 23 made of cast iron material and having a substantially cylindrical shape is provided. The lid receiver 23 is formed in a substantially inverted T-shape in cross section, and an annular support protrusion 23a that continuously extends inward is provided on the inner peripheral surface of the lower end portion of the lid receiver 23. This annular support protrusion 23
The inner diameter of a is formed to be slightly larger than the outer diameter of the protector outer lid 18, and the protector outer lid 18 can be easily opened and closed.

As shown in FIGS. 1 and 2, the manhole 2
2 is configured so that it can be opened and closed by a manhole outer lid 24 and a manhole inner lid 25 made of cast iron material.

As shown in FIG. 1, the manhole outer cover 24
Is formed in a substantially annular plate shape, and a rubber waterproof packing 26 is fitted along the outer peripheral surface thereof.
Further, when the manhole outer lid 24 is fitted into the lid receiver 23, the inner peripheral surface of the lid receiver 23 and the waterproof packing 26 are brought into close contact with each other, and rainwater, sand grains,
It prevents foreign matter such as mud from entering.

On the inner peripheral surface of the lower end portion of the manhole outer lid 24, an annular support projection 24a continuously extending inwardly is provided. The inner diameter of the annular support protrusion 24a is formed to be slightly larger than the outer diameter of the protector inner lid 19, and the manhole outer lid 24 allows the manhole 2
Even when the cover 2 is closed, the protector inner lid 19 can be easily opened and closed.

The manhole cover 25 is formed into a substantially disc shape, and the waterproof packing 2 is provided along the outer peripheral surface thereof.
6 is fitted. Furthermore, this manhole inner lid 25
When it is fitted inside the manhole outer lid 24, the inner peripheral surface of the manhole outer lid 24 and the waterproof packing 26 are in close contact with each other, and it is possible to prevent foreign matter from entering the manhole 22. ing.

Underground tank 11 constructed as described above
Is installed by either the method of transporting and assembling each member molded in the factory to the installation site (precast method) or the method of setting while placing concrete on the installation site (site casting method). can do.

The operation of the above embodiment will be described below. Now, when the oil 31 is supplied from the fuel tank (not shown) into the underground tank body 12 shown in FIG. 2, first, the manhole inner lid 25 is removed to remove the manhole outer lid 2.
The central part of 4 is opened. Next, the protector inner lid 19
Is removed to open the central portion of the protector outer lid 18, and an unillustrated refueling hose provided in the refueling vehicle is connected to the refueling port 14 to refuel.

When the oil 31 is accidentally leaked from the oil supply port 14 when the oil 31 is supplied, or when the oil 31 flows from the joint 15a of the oil pipe 15.
If the oil leaks, the oil 31 is temporarily stored in the protector 16 and does not leak into the surrounding soil 32. When removing the oil 31 contained in the protector 16, first, the manhole covers 24 and 25 are removed to open the manhole 22. Next, as shown in FIG. 1, after removing both protector lids 18 and 19 to open the upper opening 16a of the protector 16, a suction hose (not shown) is inserted into the lower end of the protector 16 to The oil 31 is sucked and removed. At this time, the oil 31 in the protector 16 can be wiped off with a cloth or the like for cleaning.

On the other hand, when rainwater falls from above the underground tank 11, as shown in FIG. 2, the gaps between the manhole inner lid 25, the manhole outer lid 24 and the lid receiver 23 are provided by the waterproof packing 26. Since it is blocked, rainwater is prevented from entering the manhole 22. However, the waterproof packing 26 may deteriorate due to long-term use, or the manhole cover 24,
When the waterproof packing 26 is damaged by sand particles or mud adhering to the surface of the waterproof packing 26 when opening and closing 25, rainwater penetrates into the manhole 22 through the gap. There is a possibility of doing.

At this time, as indicated by the arrow in FIG.
Rainwater that has entered through the gaps is protected by the protector inner lid 19
And, it flows downward along the upper surface and the side surface of the protector outer lid 18, reaches the gap 22a, penetrates into the surrounding soil 32 through the gap 22a, and is discharged. Also, when foreign matter such as sand grains or mud other than rainwater enters, it can be similarly discharged into the surrounding soil 32 through the gap 22a.

The effects exhibited by the above embodiment will be described below. An outer protector lid 18 and an inner protector lid 19 for opening and closing the protector 16 at the upper opening 16 a of the protector 16.
Since the above is provided, it is possible to reliably prevent foreign matter from entering the protector 16 with a very simple configuration. Further, since the gap 22a is provided between the outer peripheral surface of the protector 16 and the inner peripheral surface of the lower end portion of the manhole 22, the foreign matter can be easily discharged into the soil 32.

Therefore, since the protector 16 is constructed so that foreign matter such as rainwater does not enter, it is possible to effectively prevent the corrosion of the manhole portion 13, the oil supply port 14, the oil pipe 15 and the like. Furthermore, since there is no possibility that the joint portion 15a of the oil supply port 14 or the oil pipe 15 will be submerged, it is possible to reliably prevent rainwater from entering the underground tank body 12 therethrough. Further, for example, when the underground tank 11 is provided with a sensor such as an oil level gauge, it is possible to prevent the sensor from malfunctioning. In addition, since a large number of oil pipes 15 are usually arranged in the protector 16, it is very convenient because it is not necessary to perform the troublesome work of pumping rainwater from the gaps between the oil pipes 15.

Since the outer diameter of the protector inner lid 19 is smaller than the outer diameter of the manhole inner lid 25, the protector inner lid 19 can be easily removed, and the oil 31 can be easily refueled. can do. Further, since the outer diameter of the protector outer lid 18 is formed to be smaller than the outer diameter of the manhole outer lid 24, the protector outer lid 18 can be easily removed.

Since the upper end of the protector 16 is reduced in diameter, the outer diameter of the protector outer lid 18 and the outer diameter of the manhole outer lid 24 can be made small.
It is possible to make the inner diameter of the manhole 22 smaller. For this reason, the manhole outer lid 24 can be formed small, and in the case of such a configuration, the strength of the manhole outer lid 24 can be easily increased and the weight can be further reduced. is there. Furthermore, since the housing space below the protector 16 can be formed large, a large number of oil pipes 15 can be easily arranged therein.

Since the width of the gap 22a is formed to be 20 to 30 mm, the inner diameter of the manhole 22 can be formed small, and the foreign matter that has entered the manhole 22 can be reliably discharged into the soil 32. You can

Since the protector outer lid 18 and the protector inner lid 19 are made of thin stainless steel, it is possible to prevent them from being easily corroded by rainwater or the like. Further, since they are extremely lightweight, they are the outer cover 18 of the protector or the inner cover 19 of the protector.
Can be easily opened and closed.

An inclined portion 18a on the outer cover 18 of the protector
With the provision of, the foreign matter that has entered the manhole 22 can be easily guided to the gap 22a and discharged.

Since this underground tank 11 can be installed by either the precast method or the in-situ casting method, it can be appropriately selected and installed according to the situation of each installation site. Furthermore, when the underground tank 11 is installed by the precast method, each member can be molded very easily in the factory, and the time until the concrete cast on site is solidified can be saved. Therefore, as compared with the in-situ casting method, the underground tank 11 can be easily installed, and the construction period can be significantly shortened, which is economical.

The embodiment can be modified and embodied as follows. As shown in FIG. 3 (a), the manhole portion 13 at the upper end of the underground tank 11 is omitted, and a protector 16 formed in a cylindrical shape is projected from the upper end of the underground tank body 12. .

Even in the underground tank 11 configured as described above, it is possible to reliably prevent foreign matter from entering the protector 16. As shown in FIG. 3 (b), the refueling port 14 at the upper end of the underground tank 11 is omitted, and the refueling pipe 27 disposed underground is provided in the protector 16 and It is configured to be connected to the upper end portion and to supply the oil 31 into the underground tank body 12 through the oil supply pipe 27.

In this way, the oil 3 is fed through the oil supply pipe 27.
Even in the case of the configuration in which 1 is supplied, it is possible to reliably prevent foreign matter from entering the protector 16. -The waterproof packing 26 of the manhole outer lid 24 and the manhole inner lid 25 is omitted, and the waterproof performance is low. Further, at this time, the manhole outer lid 24 and the manhole inner lid 25 may be made of steel, concrete, aluminum, ceramics, stainless steel, or FRP.

In such a structure, the waterproof performance of the manhole outer lid 24 and the manhole inner lid 25 is lowered, so that a minute gap is formed between the lid receiver 23, the manhole outer lid 24 and the manhole inner lid 25. Therefore, the manhole outer lid 24 and the manhole inner lid 25 can be easily opened and closed with a small force. Furthermore, even if a foreign matter enters the manhole 22, it can be reliably discharged into the soil 32 through the gap 22a. Also,
Since maintenance of the waterproof packing 26 is not required, maintenance and management thereof can be simplified, which is economical.

On the other hand, when the manhole outer lid 24 and the manhole inner lid 25 are made of thin aluminum, ceramics, stainless steel or FRP, the manhole outer lid 24 and the manhole inner lid 25 can be reduced in weight. It is possible to open and close them more easily. Furthermore, the manhole outer lid 24 is made lighter.
Also, when the manhole cover 25 is opened and closed, it is not necessary to use a dedicated removal tool, and the opening and closing operations thereof can be easily performed.

The upper opening 16a of the protector 16
Do not reduce the diameter. -The manhole outer lid 24 and the manhole inner lid 25 are integrally formed, and the protector outer lid 18 and the protector inner lid 19 are integrally formed.

With this structure, the manhole cover 2
It is possible to simplify the configurations of 4, 25 and the protector lids 18, 19. -At least 1 sort (s) of the underground tank 11, the protector 16, the protector outer cover 18, and the protector inner cover 19 is comprised by FRP.

With such a structure, it is possible to further reduce the weight of these members while maintaining high strength. -The outer surface of the underground tank body 12 should be covered with a steel or FRP outer shell to form a double shell tank.

With this structure, the leak prevention performance of the underground tank body 12 can be further improved. -To construct the underground tank 11 having a leak prevention structure by covering the surrounding of the underground tank 11 located below the two-dot chain line shown in Fig. 2 with concrete. Further, the protector 16 located above the two-dot chain line is covered with soil 32, and the soil 32 is connected to the soil 32 around the installation location of the underground tank 11.

With this structure, the underground tank 11 having the leak prevention structure can be easily installed, and the rainwater discharged through the gap 22a can be removed from the soil around the installation location of the underground tank 11. It can be surely permeated into 32 and discharged.

Forming the upper surface of the protector inner lid 19 so as to be inclined toward the outside. With this structure, the foreign matter that has entered the manhole 22 can be more effectively discharged.

Provide a handle on at least one of the outer cover 18 and the inner cover 19 of the protector. With this structure, the member provided with the handle can be easily opened and closed.

Instead of storing the oil 31 in the underground tank body 12, for example, first petroleum (gasoline etc.), alcohol, second petroleum (kerosene, light oil), third
Storing liquids such as petroleum (heavy oil, engine oil), No. 4 petroleum (machine oil, gear oil), animal and vegetable oils, water, etc.

With this structure, the underground tank 11
The application range of can be expanded. Further, the technical idea that can be understood from the above-described embodiment will be described below.

The structure of the protector in the installation of the underground tank according to any one of claims 1 to 3, wherein the width of the gap is formed to be 20 to 30 mm. With this structure, the inner diameter of the manhole can be made small, and foreign matter that has entered the manhole can be easily discharged.

A manhole cover for opening and closing the manhole is provided, an underground tank is buried below the manhole cover, and the liquid stored in the underground tank is supplied to the upper end of the underground tank. The liquid supply port or the liquid supply pipe is provided, the liquid supply port or the liquid supply pipe is surrounded, and a protector for preventing the infiltration of soil around the liquid supply port is provided, and the liquid is leaked from the liquid supply port or the liquid supply pipe. The liquid is configured to be temporarily stored in the protector, and a gap is formed between the manhole and the protector for discharging foreign matter entering through the gap of the manhole cover into the surrounding soil. And a protector lid configured to openably and closably close the upper opening of the protector.

With this structure, it is possible to prevent foreign matter from entering the protector.

[0057]

As described above in detail, according to the present invention.
For example, it has the following effects. The invention according to claim 1
Due to the structure of the protector in the installation of the underground tank
For example, prevent foreign matter from entering the protector.
Can, Also, the inner lid of the lid can be easily removed
It

According to the structure of the protector in the installation of the underground tank of the second aspect of the invention, in addition to the effect of the first aspect of the invention, the lid can be easily opened and closed.

According to the structure of the protector for installing the underground tank of the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the manhole can be formed small, and The housing space inside the protector can be made large.

[Brief description of drawings]

FIG. 1 is an exploded sectional view showing a structure of a protector according to an embodiment.

FIG. 2 is a partial cross-sectional view showing the structure of the protector of the embodiment.

3A and 3B are partial cross-sectional views showing the structure of a protector other than the embodiment.

FIG. 4 is a partial cross-sectional view showing the structure of a conventional protector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Underground tank, 12 ... Underground tank main body which comprises an underground tank, 14 ... Oil supply port as a liquid supply port, 16 ... Protector, 16a ... Upper opening part of a protector, 18
... Protector outer lid that constitutes the lid, 19 ... Protector inner lid that constitutes the lid, 22 ... Manhole, 22a ... Gap, 24 ... Manhole outer lid that constitutes the manhole lid, 2
5 ... Manhole cover forming manhole cover, 27 ... Oil supply pipe as liquid supply pipe, 31 ... Oil as liquid, 32 ... Soil.

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 88/00-90/66 B67D 5/00-5/70 E02D 29/00-37/00 E03B 1/00-11 / 16

Claims (3)

(57) [Claims] 1. A manhole cover for opening and closing a manhole is provided, an underground tank is buried below the manhole cover, and a liquid stored in the underground tank is supplied to an upper end portion of the underground tank. With a liquid supply port or liquid supply pipe for, surrounding the liquid supply port or liquid supply pipe, a protector for preventing the infiltration of soil around it is provided, and leaks from the liquid supply port or liquid supply pipe The structure of the protector in the installation of an underground tank configured to temporarily store the liquid inside the protector, wherein the upper opening of the protector has a lid for closing the protector in an openable and closable manner. Between the manhole and the protector, foreign matter that penetrates through the gap of the manhole cover should be installed in the surrounding soil. To form a gap for discharging, it and the manhole cover and the lid member
Each of them is composed of an inner lid and an outer lid.
The structure of the protector when installing an underground tank that is smaller than the outer diameter of the inner lid of the manhole cover . 2. The outer diameter of the outer lid of the lid is the same as that of the manhole lid.
The structure of the protector for installing the underground tank according to claim 1, wherein the protector is formed to have a diameter smaller than the outer diameter of the outer lid . 3. The structure of the protector in the installation of the underground tank according to claim 1, wherein the upper portion of the protector is formed by reducing its diameter.