JPH08268490A - Double shell tank for liquid dangerous article - Google Patents

Abstract

PURPOSE: To facilitate the fitting of an outer shell to the outer surface of an inner shell and to efficiently produce a double shell tank, in a tank used in a state embedded in the ground, by providing a fine gap on the outer periphery side of the inner shell made of FRP to fit the outer shell made of FRP to the inner shell and forming reinforcing ribs to the outer surface of the outer shell in the peripheral direction thereof. CONSTITUTION: An inner shell 1 is formed by attaching an inspection port 4, a venting hole, a liquid level meter and a leak detection monitor to a cylindrical inner shell straight body part 3 made of FRP and connecting almost semispherical inner shell mirror plates 10, 10 made of FRP to both ends of the inner shell straight body part 3 by FRP overlays. An outer shell 2 is integrated with the inner shell by cutting the upper part of a cylindrical outer shell straight body part 13 in the axial direction thereof and expanding the same from the cut part 14 to cover the outer periphery of the inner shell 1 with the expanded straight body part 13 so as to leave a minute gap and laminating the cut part 14. Semicylindrical mirror plates 18 are inserted in the outer shell straight body part 13 from both ends thereof to be bonded thereto and reinforcing materials 23 are applied to the outer periphery of the outer shell 2 in the peripheral direction thereof and integrated therewith by FRP overlays to form reinforcing ribs 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-shell tank for liquid hazardous materials which is used by being buried underground in 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. Further, since the inner shell and the outer shell are formed of steel plates, there is a problem that the weight is large and it takes time to move and install. The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to use a liquid hazardous material by using FRP which has excellent corrosion resistance and can be sufficiently used in terms of strength. An object of the present invention is to provide a double-shell tank for liquid dangerous substances, which can surely prevent leakage accidents and is easy to manufacture and install.

[0004]

In order to achieve the above object, in the double-shell tank for liquid dangerous substances of the present invention, an inspection port,
FR with a small gap on the outer circumference of the FRP inner shell equipped with ventilators, leak detection monitors, oil supply pipes, lubrication pipes, and other accessory devices
A structure was adopted in which a P outer shell was fitted and reinforcing ribs were formed on the outer surface of the outer shell.

[0005]

In the double-shell tank for liquid dangerous goods of the present invention, since the reinforcing ribs in the circumferential direction are formed on the outer surface of the outer shell, the double-shell tank has sufficient strength to withstand earth pressure and other external pressure. Can be manufactured. Further, since the outer surface of the inner shell is not uneven, it is easy to provide the outer shell. In addition, double shell F
Since it is made of RP to reduce the overall weight, it is easy to transport and install. Further, since the double shell is made of FRP, even if liquid dangerous substances such as gasoline, light oil, and kerosene leak from the inner shell, they do not leak to the outside.

[0006]

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

First, the configuration of the embodiment will be described. Figure 1
Explanatory drawing which shows the double-shell tank A for liquid dangerous goods of this embodiment,
2 is an explanatory view showing the inner shell, and FIG. 3 is an explanatory view showing the inner surface of the inner shell. The double shell tank A for liquid dangerous substances of the present embodiment has an inner shell 1 and an outer shell 2 as main components.

The inner shell 1 forms a cylindrical inner shell straight body part 3 made of FRP by the rotary lamination method, and the inner shell straight body part 3 has an inspection port 4, a ventilation port 5, a liquid level gauge 6, After attaching attached devices such as a leak detection monitor-7, an oil filling pipe 8 and an oil supply pipe 9, the inner shell end plates 10 and 10 made of FRP, which are formed in a substantially hemispherical shape with a molding die in advance, at both ends of the inner shell straight body part 3. And the both are connected by an FRP overlay to form a cylindrical inner shell 1. Pipes such as the oil injection pipe 8 and the oil supply pipe 9 are preferably concentrated in the inspection port 4 from the viewpoint of maintenance. Further, 11 is a partition plate for partitioning the inside of the inner shell 1. In this embodiment, the partition plate is curved and attached so as not to be broken by the pressure of the liquid on the left and right sides of the partition plate 11.

The outer shell 2 is formed by forming a minute gap on the outer circumference of the inner shell 1 and, in this embodiment, FIG.
As shown in (b), a mandrel 12 is used to form a cylindrical outer shell straight body portion 13, and an upper portion thereof is axially cut with a cutter (not shown) and cut into the cutting portion 14. Notches 15 and 16 for fitting the inspection port 4 of the inner shell 1 and the leak detection monitor-7 are formed. Next, as shown in FIG. 4 (c), it is spread from the cutting portion 14 and covered from the outer periphery of the inner shell 1 to fit the outer periphery of the inner shell, and the cutting portion 14 and the cut portions 15 and 16 are aligned. Then, the FRP is laminated thereon, and the upper portion of the outer shell and the upper portion of the inner shell are joined and integrated as shown in FIG. Next, as shown in FIG. 4 (e), the FRP semi-cylindrical end plate 18, which has been manufactured using the mold 17 in advance, is inserted from both ends of the outer shell straight body part 13 and both of them are inserted. The FRP is laminated on the joint portion 19 and the straight body portion 13 and the end plate 18 are joined. It should be noted that a resin film 20 or a mesh is wound around the lower portion of the joint portion 19 between the two, and the outer shell 2 and the inner shell 1 are integrally connected by the resin, and the gap (small gap) 21 between them is not closed. I am trying. Further, a leak detection sensor (not shown) for detecting the leak of the liquid from the inner shell 1 is arranged at the portion C in FIG. 5, and its wiring is connected to the leak detection monitor-7 through the leak detection monitor-tube 22. When connected and there is a leak, the leak detection monitor-7 can detect it. next,
The reinforcing ribs 23 made of a metal square pipe or other rigid material are applied to the outer periphery of the outer shell 2 in the circumferential direction, and integrated with the FRP overlay to form the reinforcing ribs 24. Incidentally, reference numeral 25 in the drawing denotes a brush for applying a thermosetting resin when the FRP is laminated.

Therefore, since the tank A of this embodiment is constructed as described above, it is easier to manufacture the double shell tank as compared with the case where both the inner shell 1 and the outer shell 2 are made of steel plates.
Productivity can be improved. In particular, since the outer surface of the inner shell is not provided with irregularities, it is easy to fit the outer shell 2 on the outer surface of the inner shell, and the double shell tank can be efficiently manufactured. Further, since the outer shell 2 is formed in a cylindrical shape that fits the outer surface of the inner shell, a double shell tank having less residual strain and having durability can be manufactured. Further, since the reinforcing ribs 24 are formed after the outer shell 2 is fitted on the outer circumference of the inner shell, the manufacturing is easy. Further, since the circumferential reinforcing ribs 24 are formed on the outer surface of the outer shell, it is possible to manufacture a double shell tank having sufficient strength to withstand earth pressure and other external pressure. Further, since the inner shell 1 and the outer shell 2 are formed of FRP, the weight of the tank can be reduced, and the transportation and installation work can be efficiently performed.

The embodiment of the present invention has been described above with reference to the drawings. However, the specific structure is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. However, it is included in the present invention.

For example, in the embodiment, the inner shell 1 is formed of the straight body portion 3 and the two mirror plates 10 and 10, but in addition to this, as shown in FIG. It can be formed of the straight body portion 26 with the end plate and the end plate 27 for joining which are formed in the above, or as shown in FIG.

Further, the outer shell 2 is attached by using the straight body portion 13 and the two end plates 18 and 18, and then the reinforcing ribs 24 are attached. As shown in FIG. 10, the outer shell is reinforced. Two outer shell straight body split ribs 2 provided with ribs 24
9 and 29 and two end plates 18 and 18, or FIG.
As shown in, the outer shell 2 provided with the reinforcing ribs 24 on the outer periphery is formed of the outer shell split bodies 30 and 30 divided into two,
Although not shown, after the film is wound around the outer surface of the inner shell 1, the outer shell 2 is formed by spraying up, and then the reinforcing ribs 24 are formed.
May be formed.

If the outer shell straight body portion 13 is formed to have a diameter smaller than that of the inner shell straight body portion 3, when the outer shell outer periphery is covered with the inner shell outer circumference, the upper portion of the inner shell can be covered. No, inspection port 4
Since the leak detection monitor 7 does not get in the way, it is not necessary to form the cut portions 15 and 16 in the cutting portion 14 in that case.

As the leak detection sensor, a direct detection type sensor such as a substance sensor or a composite substance sensor is used. However, a liquid float sensor, an airtight sensor, a liquid seal sensor or a paper is used. An indirect detection type sensor such as a sensor may be used.

Also, it is not necessary to provide all the auxiliary devices described in the embodiments, and other devices may be attached. Moreover, the arrangement and the like are also arbitrary.

[0017]

As described above, in the double shell tank for liquid dangerous substances of the present invention, since the outer surface of the inner shell is not provided with the unevenness, it is easy to fit the outer shell on the outer surface of the inner shell. The double shell tank can be efficiently manufactured. Further, since the inner surface reinforcing ribs are formed on the outer surface of the inner shell, it is possible to manufacture a double shell tank having sufficient strength to withstand external pressure. 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. Also, double shell FR
Since it is made of P to reduce the overall weight, it is easy to transport and install. Further, since the double shell is made of FRP, even if liquid dangerous substances such as gasoline, light oil, and kerosene leak from the inner shell, they do not leak to the outside.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a double-shell tank for liquid dangerous substances according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an inner shell of the embodiment.

FIG. 3 is an explanatory view showing the inside of the inner shell.

FIG. 4 is an explanatory view showing a method of attaching the outer shell.

FIG. 5 is a cross-sectional view showing a double-shell tank for liquid dangerous goods according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a B part in FIG. 5;

FIG. 7 is an explanatory diagram showing a C portion of FIG.

FIG. 8 is an explanatory view showing another attachment method of the inner shell.

FIG. 9 is an explanatory view showing another mounting method of the inner shell.

FIG. 10 is an explanatory view showing another attachment method of the outer shell.

FIG. 11 is an explanatory view showing another attachment method of the outer shell.

[Explanation of symbols]

 1 Inner shell 2 Outer shell 4 Inspection port 5 Vent hole 7 Leak detection monitor-8 Lubrication pipe 9 Oil supply pipe 24 Reinforcement rib

Claims (1)

[Claims] 1. An FRP outer shell is fitted with a minute gap provided on the outer periphery of an FRP inner shell provided with auxiliary devices such as an inspection port, a vent, a leak detection monitor, an oil supply pipe, and an oil supply pipe. A double-shell tank for liquid dangerous goods, characterized in that circumferential ribs are formed on the outer surface of the outer shell.