JPS6227760Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a storage tank with a high dyke.

Due to an accident, the storage liquid leaked from the storage tank (outer tank for double-shelled cryogenic storage tanks) and was dammed by the High Dike.
A large amount of water enters between the storage tank bottom plate and the concrete bottom plate until it is transferred to another storage tank. Previously, asphalt-impregnated prevention tape was pasted between the storage tank bottom plate and the concrete bottom plate to prevent rainwater from entering.
When LNG (-162°C) or LPG (-45°C) leaks, they suffer from low-temperature embrittlement and cracking, and they also have the disadvantage of not being able to follow the shrinkage of the tank bottom plate due to low temperatures and breaking.

Therefore, even if waterproof tape is applied, when low-temperature liquid leaks from a tank storing low-temperature liquid, it is unavoidable that the liquid will enter under the bottom plate of the tank, and even if the leaked liquid is completely recovered, As a result, the stored liquid remains between the tank bottom plate and the concrete bottom plate,
Residual liquid may cause an explosion during tank repair, and in the case of low-temperature liquid, thermal shock cracking of the foundation bottom plate,
There are serious problems such as thermal deformation. In addition, if the stored liquid enters the lower part of the tank bottom plate, when the liquid in the storage tank (or inner tank) is drained, it may give buoyancy to the tank or cause the bottom plate to bulge upward due to the evaporation and expansion of low-temperature gas. This results in problems such as displacement of the tank and a large amount of stored liquid entering the lower part of the tank bottom plate.

The present invention was developed in response to these circumstances, and has a simple structure that solves the problems of the conventional technology and completely eliminates the leakage liquid that attempts to enter between the storage tank bottom plate and the concrete bottom plate. The purpose of this project is to improve the recovery work efficiency of leaked liquid, the safety repair efficiency, and the prevention efficiency of thermal shock cracking and thermal deformation of the foundation bottom plate in the case of low-temperature liquid.

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

Figures 1 to 4 show different examples of sealing members that prevent leaked liquid from entering under the bottom plate of the tank. First, the embodiment shown in Figure 1 is explained in order. Showing double shell cold storage tank,
The storage tank A is composed of an inner tank 1, an outer tank 2, a concrete bottom plate 3, a bottom cold insulator 4, and the like. Although not particularly shown, a heat insulating material such as pearlite grains or polyurethane foam (PUF) is provided around the entire inner surface of the outer tank 2.

Reference numeral 5 is a concrete high dike provided close to the outside of the storage tank A, and the lower end of the high dike 5 is connected to the concrete bottom plate 3.
Although not particularly shown, the upper end opening of this high-dike 5 is fitted into a groove 6 provided on the outer peripheral edge of the storage tank (outer tank) in a liquid-tight manner. Covered by a canopy, it prevents rainwater from entering and accumulating between the tank outer wall and the high dike.

The present invention provides a storage tank with a high dike constructed as described above, in which a ring-shaped A seal member 8, which has an inverted U-shaped cross section and is deformable in the radial direction of the tank, is fixed between the anchor member 7 and the anchor member 7 through a closed space 14, to prevent leakage of low-temperature liquid at all times. The radial contraction of the annular bottom plate 2a is followed even when the annular bottom plate 2a spills out, thereby ensuring liquid tightness, and the stored liquid leaking from the outer tank 2 to the outside enters between the outer tank bottom plate 2b and the concrete bottom plate 3. This is to prevent this.

In addition, when the storage liquid is a cryogenic liquid such as LNG, in order to prevent the high-dike 5 and the concrete bottom plate 3 from being subjected to thermal shock and thermal shock cracking or thermal deformation due to the liquid leaking from the outer tank, Insulating material 9 such as perlite concrete or PUF on the inner surface of the high-dike 5 and the top surface of the concrete bottom plate 3,
10 so that there are no exposed concrete surfaces. In the figure, reference numeral 11 denotes a heat insulating layer such as perlite concrete laid on the lower surface of the outer tank bottom plate 2b, which prevents thermal deformation of the concrete bottom plate.

Next, the embodiment shown in FIG. 2 will be described. Since the structure of the double-shell low-temperature storage tank with high dyke is the same as that of the embodiment shown in FIG. 1, repeated explanation will be omitted. In this embodiment, one end of a sealing member 8a sealed to an anchor member 7 is fixed to the outer periphery of the side plate of the outer tank 2 via a sealed space 14.

In the embodiment shown in FIG. 3, one side edge of a groove 12 provided in the concrete bottom plate 3 is exposed to the outer circumferential edge of the annular bottom plate 2a of the outer tank 2, and a liquid collection trough 13 is also provided in the groove 12. A sealing member 8b having a U-shaped cross section is inserted, and the outer edge of the sealing member 8b is connected to the anchor member 7, and the inner edge thereof is connected to the sealed space 1.
4 to the end of the annular bottom plate 2a.

Next, the embodiment shown in FIG. 4 will be described. A ring-shaped anchored seal member 8c whose lower side is embedded in the concrete bottom plate 3 is fixed to the outer peripheral end of the annular bottom plate 2a of the outer tank 2. In the figure, reference numeral 14 denotes a sealed space that allows the anchored seal member 8c to be deformed in the radial direction of the tank.

In addition, each of the above embodiments describes a double shell low temperature storage tank with a high dyke, but in the case of a double shell low temperature storage tank with a low dyke and other storage liquids other than cryogenic liquids, a single shell storage tank may also be used. Applicable. In this case, there is no need to consider thermal shock acting on the concrete high dyke and the concrete bottom plate, so the installation of the above-mentioned heat insulating materials 9 and 10 can be omitted.

Since the present invention is configured as described above, even if the stored liquid in the storage tank spills out due to an accident, the high dike can prevent the stored liquid from dispersing over a wide area. A sealing member that can be deformed in the radial direction of the tank is installed between the lower outer periphery of the storage tank (outer tank for double-shelled low-temperature storage tanks) and a ring-shaped anchor member embedded in the entire periphery of the concrete bottom plate. Closed space 14
Since the storage liquid is disposed through the outer tank, it is possible to completely prevent the storage liquid leaking from the outer tank from entering between the storage tank bottom plate and the concrete bottom plate.

Therefore, when repairing the tank, an accident in which the residual liquid between the storage tank bottom plate and the concrete bottom plate ignites and explodes can be prevented, and safety can be improved. In addition, unlike in the case of low-temperature liquid, thermal shock caused by intruding liquid does not cause thermal shock cracking or thermal deformation to the concrete bottom plate, and it also provides buoyancy to the tank when draining liquid, preventing the tank from shifting laterally. This is a useful idea that can rationally measure the efficiency of leakage liquid recovery work, safety repair work efficiency, etc.

[Brief explanation of the drawing]

1 to 4 are longitudinal sectional front views of main parts, respectively. A...Storage tank, 1...Inner tank, 2...Outer tank,
2a... Annular bottom plate, 2b... Outer tank bottom plate, 3... Concrete bottom plate, 4... Bottom cold insulation, 5... High Dike, 7... Anchor member,
8, 8a, 8b, 8c... Seal member, 9, 10
...insulation material, 14...closed space.

Claims (1)

[Scope of utility model registration request] In a storage tank with a high dike, a ring-shaped anchor member is embedded in the entire lower circumference of the storage tank (outer tank in a double shell low temperature storage tank) and the entire periphery of the concrete bottom plate in the area surrounded by the high dike. A storage tank with a high dyke, characterized in that a sealing member that can be deformed in the radial direction of the tank is disposed between the sealed space 14.