JPH08258890A - Double-shell tank for hazardous liquid - Google Patents

Abstract

PURPOSE: To securely prevent leakage accidents of hazardous liquid, by providing an inspection opening or the like on a cylindrical FRP inner shell in which reinforcing ribs are formed at the inside thereof and providing a minute clearance at the external periphery of the inner shell to cover it with a FRP outer shell. CONSTITUTION: A FRP cylindrical inner straight shell 3 is formed as an inner shell 1 and reinforcing ribs are circumferentially formed at the inside face thereof and auxiliary devices like an inspection opening 8, a leakage detection monitor 11, etc., are installed at the inner straight shell 3. Thereafter, FRP inner shell end plates 14 which have been formed nearly semi-spherical in advance by a mold, are applied on both ends of inner straight shell and both end plates and straight shell are connected by overlaying FRP materials to form the cylindrical inner shell 1. The outer shell 2 is put on the external periphery of the inner shell 1 with a minute clearance between the shells. The outer straight shell having a cut face 17 in which notches 18, 19 to fit the inspection opening 8 of the inner shell 1, the leakage detection monitor 11, etc., are formed, is widened to put on the external periphery through a film 23 wound up the external periphery of the inner shell 1 and unite the upper part of outer shell and the upper part of inner shell together.

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 a double shell tank for liquid dangerous substances of the present invention, an inspection port is provided in a cylindrical FRP inner shell having inner surface reinforcing ribs formed on the inner surface thereof. , A vent, a leak detection monitor, an oil supply pipe, an oil supply pipe, and other accessory devices are provided, and a FRP outer shell is fitted with a minute gap provided on the outer periphery of the inner shell.

[0005]

In the double-shell tank for liquid dangerous substances of the present invention, since the inner surface reinforcing rib is formed on the inner surface of the inner shell and no unevenness is provided on the outer surface of the inner shell, it is possible to fit the outer shell on the outer surface of the inner shell. It is easy and the double shell tank can be manufactured efficiently. In addition, since the inner surface of the inner shell is provided with the reinforcing ribs in the circumferential direction, it is possible to manufacture a double shell tank having sufficient strength to withstand earth pressure and other external pressure. Also, double shell FRP
Since it is formed by, and the overall weight is reduced, transportation and installation work are easy. 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
The side view which shows the double-shell tank A for liquid dangerous goods of a present Example,
2 is an explanatory view showing the inner shell, and FIGS. 3 to 5 are explanatory views showing the inner surface reinforcing ribs 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 portion 3 made of FRP by the rotary lamination method, and the inner surface thereof is made of a metal square pipe or other rigid material in the circumferential direction. The reinforcing material 4 is applied, and the FRP is laminated and integrated on the reinforcing material 4 to form the inner surface reinforcing rib 5. In the present embodiment, since the inner surface reinforcing ribs 5 are formed, strength enough to withstand earth pressure and other external pressures is secured as compared with the case where the reinforcing ribs are formed on the outer surface of the inner shell. be able to. In this embodiment, the inner surface reinforcing ribs 5 are formed on the entire inner surface of the inner shell. However, when the liquid flow is hindered,
As shown in FIG. 4, the communication hole 6 can be formed in the reinforcing rib 5, or as shown in FIG. 5, the lower portion of the reinforcing rib 5 can be partially cut to form a cutout portion 7.

Next, an inspection port 8, a ventilation port 9, a liquid level gauge 10, a leak detection monitor 11, an oiling pipe 12, are provided on the straight shell portion 3 of the inner shell.
After attaching auxiliary equipment such as the oil supply pipe 13, the inner shell straight body part 3
FRP formed in a hemisphere shape on both ends of the mold beforehand
The inner shell end plates 14 and 14 made of metal are applied, and the both are connected by an FRP overlay to form a cylindrical inner shell 1. Oiling pipe 12
It is preferable from the viewpoint of maintenance that the pipes such as the oil supply pipe 13 and the oil supply pipe 13 are concentrated at the inspection port 8.

The outer shell 2 is formed by forming a minute gap on the outer circumference of the inner shell 1, and in this embodiment, it is shown in FIG.
As shown in (b), a mandrel 15 is used to form a cylindrical outer shell straight body portion 16, and an upper portion thereof is axially cut by a cutter (not shown) and cut into a cutting portion 17 thereof. Notches 18 and 19 for fitting the inspection port 8 of the inner shell 1 and the leak detection monitor-11 are formed. Next, FIG. 6 (C)
As shown in FIG. 5, the cut surface 17 and the cut portions 18, 19 are fitted to each other by unfolding the cut portion 18, 19 from the outer circumference of the inner shell 1 to fit the outer circumference of the inner shell, and then the FRP from above. Are laminated, and as shown in FIG. 6D, the outer shell upper portion and the inner shell upper portion are joined and integrated. Next, FIG.
As shown in (e), a semi-cylindrical end plate 21 made of FRP, which has been manufactured by using the mold 20 in advance, is inserted from both ends of the outer shell straight body portion 16 to join the joint portions 22 of the two. The FRP is laminated from above and the straight body portion 16 and the end plate 21 are joined. A resin film 23 or a mesh is wound around the lower portion of the joint portion 22 so that the outer shell 2 and the inner shell 1 are integrally connected by the resin so that there is no gap (small gap) between them. There is. Further, a leak detection sensor (not shown) for detecting the leak of the liquid from the inner shell 1 is a C shown in FIG.
The wiring is connected to the leak detection monitor-11 through the leak detection monitor-pipe 25 so that any leak can be detected by the leak detection monitor-11. Reference numeral 26 in the drawing denotes a brush for applying a thermosetting resin when the FRP is laminated. Further, 27 is a partition plate for partitioning the inside of the inner shell 1, which is attached in a curved manner,
It is designed not to be destroyed by the pressure of the liquid on the left and right of 7.

Therefore, since the tank A of this embodiment is constructed as described above, the double shell tank is easier to manufacture 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 inner surface reinforcing ribs 5 are formed on the inner surface of the inner shell and no unevenness is provided on the outer surface of the inner shell, it is easy to fit the outer shell 2 on the outer surface of the inner shell, and the double shell tank is efficiently manufactured. can do. 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, the inner surface of the inner shell is provided with reinforcing ribs 5 in the circumferential direction.
Since it is formed, it is possible to manufacture a double shell tank having sufficient strength to withstand external pressure. Also, the inner shell 1
Since the outer shell 2 is made of FRP, the weight of the tank can be reduced, and the transportation and installation work can be efficiently performed.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration 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 and the outer shell 2 are formed by the straight body portion and two mirror plates, but in addition to this, as shown in FIG. 11, a mirror plate is previously integrated at one end. It is formed by the straight body portion 28 with the end plate with the end plate and the end plate 29 for joining formed as shown in FIG. 12, or as shown in FIG. It can also be formed by spraying up after winding a resin film around the inner shell.

In the embodiment, no rib is formed on the outer circumference of the outer shell 2, but a reinforcing material made of a rigid material such as a metal square pipe is applied to the outer circumference to integrate the outer shell with the FRP overlay. You can also In this case, there is an effect that the strength of the tank can be further increased.

If the outer shell straight body portion is formed to have a diameter smaller than that of the inner shell straight body portion, when the outer shell outer circumference is covered with the inner shell outer circumference, the upper portion of the inner shell cannot be covered. Since the inspection port and the leak detection monitor do not get in the way, it is not necessary to form the cut portion in the cut portion 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, but 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.

[0018]

As described above, in the liquid double dangerous substance double shell tank of the present invention, since the inner surface reinforcing ribs are formed on the inner shell inner surface and the inner shell outer surface is not provided with irregularities, the inner shell outer surface is formed. It is easy to fit the outer shell to the shell, and the double shell tank can be efficiently manufactured. In addition, since the inner surface reinforcing ribs are formed on the inner surface of the inner shell, it is possible to manufacture a double shell tank having sufficient strength to withstand external pressure. Also, because the outer shell is formed into a tubular shape that fits the outer surface of the inner shell,
It is possible to manufacture a double-shell tank having little residual strain and having durability. Further, since the double shell is made of FRP 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 an inner surface reinforcing rib.

FIG. 4 is an explanatory view showing an inner surface reinforcing rib.

FIG. 5 is an explanatory view showing an inner surface reinforcing rib.

FIG. 6 is an explanatory diagram showing a method of attaching an outer shell.

FIG. 7 is a sectional view showing a double-shell tank for liquid dangerous substances according to an embodiment of the present invention.

8 is an explanatory diagram showing a B part in FIG. 7. FIG.

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

FIG. 10 is an explanatory view showing a partition plate inside the inner shell.

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

FIG. 12 is an explanatory view showing another attachment method of the outer shell.

[Explanation of symbols]

 1 Inner Shell 2 Outer Shell 5 Inner Surface Reinforcing Rib 8 Inspection Port 9 Vent 11 Leak Detection Monitor-12 Lubrication Pipe 13 Oil Supply Pipe 24 Gap (Small Gap)

Claims (1)

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