JP2598766B2 - Manufacturing method of double shell tank for liquid hazardous materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a double-hull tank for liquid hazardous materials which is used by being buried under a gas station.

[0002]

2. Description of the Related Art In a conventional double-shell tank for liquid hazardous materials, an inner shell and an outer shell are formed of a steel plate having a thickness of 3.2 mm or more.

[0003]

However, since the inner shell and the outer shell of the conventional double shell tank for liquid hazardous materials are formed of a steel plate, even if the steel plate is coated with an outer surface, corrosion of the steel plate is prevented. It cannot be completely prevented, and there has been a problem that a leak accident has conventionally occurred due to corrosion of a steel sheet. In addition, the conventional double shell tank for liquid hazardous materials is manufactured by processing the inner shell and the outer shell of a steel plate, which requires time and labor for bending and welding, and also has the problem of poor manufacturing efficiency. Was. The present invention has been made in order to solve the above-mentioned problems in the related art, and an object of the present invention is to provide an FRP outer shell which has at least an outer shell having excellent corrosion resistance and sufficient strength. An object of the present invention is to provide a method for manufacturing a double shell tank for liquid hazardous material, which can reliably prevent a liquid hazardous material from leaking by using it and is easy to manufacture.

[0004]

In order to achieve the above object, the present invention provides a method for manufacturing a double shell tank for liquid hazardous materials, comprising a liquid outlet, a vent, an inspection port, a leak detection monitor, and a liquid filling tank. The upper surface is cut in the axial direction on the outer periphery of a cylindrical inner shell provided with an attachment device such as a pipe for removing or removing, and the cut portion is formed with a cut portion for fitting the attachment device. The outer shell straight body portion is fitted, and the cut portion and the cut portion of the upper portion of the outer shell straight body portion are joined to the upper portion of the inner shell to integrate them. A method was adopted in which outer shell end plates were attached to both ends of the portion with a resin film or mesh placed under the joint.

[0005]

According to the method for manufacturing a double-shell tank for liquid hazardous materials of the present invention, the outer shell is easily joined to the inner shell because of the above-mentioned structure, and the double-shell tank can be manufactured efficiently. Can be. Further, since the outer shell is formed in a cylindrical shape that matches the outer surface of the inner shell, a durable double-shell tank having little residual distortion can be manufactured. At least the outer shell is F
Since it is formed of RP, it is possible to manufacture a tank that does not leak to the outside even if liquid dangerous substances such as gasoline, light oil, and kerosene leak from the inner shell. The outer shell is F
Since it is formed of RP to reduce the overall weight, transportation and installation work and the like become easy. Further, since the number of connection portions is small, leakage accidents due to the generation of pin holes can be reduced.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, the configuration of the embodiment will be described. FIG.
The method for manufacturing a double shell tank for liquid hazardous materials of this embodiment is shown. In this embodiment, a steel plate is used as an inner shell. The inner shell 1 is formed by processing a steel plate to form a cylindrical inner shell straight body portion 2 and connecting the end plates 3 and 3 formed by processing the steel plate to both ends thereof. In addition, the inner shell 1 is provided with an inspection port 4 and a leak detection monitor 5 at an upper portion thereof, and a pipe (not shown) for filling or taking out a liquid such as gasoline, a liquid outlet (not shown), or the like. Attached devices such as a vent (not shown) and a liquid level gauge (not shown) are attached. Next, an outer shell 6 made of FRP is provided on the outer periphery of the inner shell 1.
The method of mounting is explained. First, as shown in FIG. 1A, a cylindrical outer shell 8 made of FRP is formed using a mandrel 7, and as shown in FIG. The upper part is pulled out and cut in the axial direction by a cutter (not shown), and cut parts 10 and 11 are formed in the cut part 9 for fitting the inspection port 4 of the inner shell 1 and the leak detection monitor 5 and the like. I do. Next, as shown in FIG.
1 and fitted on the outer periphery of the inner shell, the cut surface 9 and the cut portions 10 and 11 are aligned, and FRP is laminated from above, and as shown in FIG. The upper part of the inner shell is joined and integrated. Next, as shown in FIG. 1 (e), the FRP previously manufactured using the mold 13a
The semi-cylindrical end plate 13 made of a metal is inserted from both ends of the outer shell straight body portion 8, and the joint portion 14 of both is laminated with FRP from above to join the straight body portion 8 and the end plate 13. In addition, a resin film 15 or a mesh is wound around the lower part of the joint portion 14 so that the outer shell 6 and the inner shell 1 are integrally connected by the resin so that the gap 16 therebetween is not closed. . A leak detection sensor (not shown) for detecting leakage of the liquid from the inner shell 1 is disposed at a portion B in FIG.
, So that when there is a leak, it can be detected by the leak detection monitor-5. 17 is FRP.
This is a brush for applying a thermosetting resin at the time of lamination.

Therefore, in the manufacturing method of this embodiment, since the above-described structure is employed, the manufacture of the double-shell tank is easier and the productivity is lower than when both the inner shell and the outer shell are made of steel plates. Can be improved. Further, since the outer shell is formed in a cylindrical shape that matches the outer surface of the inner shell, a durable double-shell tank having little residual distortion can be manufactured. In addition, even if gasoline leaks due to corrosion of the inner shell, leakage to the outside can be prevented by the outer shell made of FRP,
Leakage accidents can be reliably prevented. Further, since the outer shell is formed of FRP, the weight of the tank can be reduced, and transport and installation work can be performed efficiently.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. This is also included in the present invention.

For example, although the inner shell is formed of a steel plate in the embodiment, it may be formed of FRP. In this case, it is preferable to provide a strengthening ring on the outer surface or the inner surface of the inner shell in order to impart strength. A hat-shaped or other appropriate one can be used as the strengthening wheel.

In the embodiment, the reinforcing ribs are not formed on the outer periphery of the outer shell. However, a reinforcing member made of steel, plastic, or the like is provided on the outer periphery of the straight shell for the outer shell, so that the FRP overlay is formed. It can also be joined and integrated with the outer shell straight body. In this case, sufficient strength can be ensured even if an inner shell made of FRP is used.

Further, if the diameter of the outer shell straight body is made smaller than the diameter of the inner shell straight body, when the outer shell is covered on the outer circumference of the inner shell, the upper part of the inner shell cannot be covered. Since the inspection port and the leak detection monitor are not in the way, it is not necessary to form a cut portion in the cut portion in that case.

The leak detection sensor may be a direct detection type such as a substance sensor or a composite substance sensor, or an indirect detection type such as a liquid float sensor, an airtight sensor, a liquid ring sensor, or a paper sensor. Any of the above may be used.

[0014]

As described above, in the method for manufacturing a double shell tank for liquid hazardous materials of the present invention, since the above-described structure is employed, both the inner shell and the outer shell are manufactured from a steel plate. Compared with this, it is easier to manufacture a double shell tank, and the productivity can be improved. Further, since the outer shell is formed in a cylindrical shape that matches the outer surface of the inner shell, a durable double-shell tank having little residual distortion can be manufactured. Further, even if the inner shell is corroded and gasoline or the like leaks, leakage to the outside can be prevented by the outer shell made of FRP, so that a leak accident can be reliably prevented. Further, since the outer shell is formed of FRP, the weight of the tank can be reduced, and transport and installation work can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for manufacturing a double shell tank for liquid hazardous materials according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a double shell tank for liquid dangerous goods manufactured by the manufacturing method of the embodiment.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is an enlarged view of a portion B in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner shell 6 Outer shell 8 Straight body part for outer shell 9 Cutting part 10 Notch part 11 Notch part 13 End plate for outer shell 14 Joining part 15 Resin film

Claims (1)

(57) [Claims] 1. The upper surface is cut axially around the outer periphery of a cylindrical inner shell provided with an auxiliary device such as a liquid outlet, a vent, an inspection port, a leak detection monitor, and a pipe for filling or removing the liquid. At the same time, the cut portion is fitted with a straight body portion for an outer shell made of FRP formed with a cut portion for fitting the attached device, and the cut portion and the cut portion on the upper portion of the straight body portion for the outer shell are formed. Is joined to the upper part of the inner shell to integrate them, and then the outer shell end plates are joined at both ends of the outer shell straight body part with a resin film or mesh placed under the joint. A method for producing a double shell tank for liquid hazardous materials, characterized in that: