JPS5842720Y2 - Underground tank for liquefied gas storage - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an underground tank for storing liquefied gas such as LNG.

The main structure of this type of conventional underground tank is as shown in Figure 1, for example.

In the figure, 1 is a bottom plate, and 2 is a side wall.

Steps 3 and 4 are formed on the periphery of the bottom plate 1 and the bottom periphery of the side wall 2, respectively.
are in contact with each other via the support member 5.

Further, 6 is an interior material having a tower shape, and this interior material 6 is fixed to an appropriate location on the inner surface of the side wall 2 and the upper surface of the bottom plate 1.

According to such a configuration, the bottom plate 1 can move independently with respect to the side wall 2I, so that even if a load is applied to the bottom plate 1, problems such as large bending stress occurring in the side wall 2 can be prevented.

However, with this configuration, if the amount of displacement of the bottom plate 1 relative to the side wall 2I is large, the interior material 6, which is fixed to both the bottom plate 1 and the side wall 2, has the disadvantage that it will break if the amount of displacement exceeds its allowable displacement. there were.

Therefore, an underground tank with a configuration as shown in Fig. 2 has been developed.

That is, the floor slab 7 is integrally formed with the side wall 2.

This floor slab γ covers the entire upper part of the bottom slab 1, and a slipping material 8 such as sand is interposed between the floor slab 7 and the bottom slab 1.

An interior material 6 is fixed at appropriate positions on the inner surface of the side wall 2 and the upper surface of the floor slab 7.

According to such a configuration, the side wall 2 to which the interior material 6 is fixed,
Since the floor slab 7 is integral and there is no relative movement, deformation and destruction of the interior material 6 can be prevented.

However, with this configuration, the diameter of the floor slab 7 attempts to increase when the temperature rises, but this is blocked by the side wall 2, and in this case, the diameter of the floor slab 7 increases.
(This large compressive force in the radial direction, combined with the large diameter of the floor slab 7, could cause buckling.

Furthermore, when waves that oppose the floor slab 7O occur during an earthquake, a large compressive force acts on the floor slab 7 in the radial direction, which may cause the floor slab 7 to buckle.

Further, since a large bending stress is applied to the connecting portion 9 between the side wall 2 and the floor slab 7, there is a risk that this portion will break.

The present invention was developed based on the above circumstances, and its purpose is to form a depression in the periphery of the upper surface of the bottom slab, store the floor slab in this depression, and store the floor slab and the side walls.
The present invention aims to provide an underground tank for storing liquefied gas that can eliminate all the drawbacks of the conventional structure described above by interposing an elastic material in the joint between the bottom plate and the bottom plate.

Hereinafter, a first embodiment of the present invention will be explained based on FIGS. 3 and 4.

Figure 3 shows the overall diagram of the underground tank, and Figure 4 shows the main parts.

Reference numeral 1 denotes a reinforced concrete bottom plate, and a stepped portion 3 is formed at the peripheral edge of the bottom plate 1, and an annular recessed portion 10 is formed at the peripheral portion of the upper surface.

Then, this bottom plate 1 (on which side walls 2 are placed) is placed.

A step portion 4 is formed at the lower end peripheral edge of this side wall 2.
This stepped portion 4 is brought into contact with the stepped portion 3 of the bottom plate 1 with a support member 5 interposed therebetween.

This allows the bottom plate 1 to move horizontally with respect to the side wall 4.

Further, an annular floor slab 11 is accommodated in the depressed portion 10 of the bottom slab 1.

A slipping material 8 such as sand or oil is interposed between the lower surface of this floor slab 11 and the upper surface of the recessed part 10 of the bottom slab 1. It's been 10 years.

The outer peripheral edge of the floor slab 11 and the side wall 2 are
An elastic material 14 made of rubber, urethane, asphalt, etc. is interposed in the joint 13 between them.

Although not shown, the joint portion 15 between the inner circumferential edge of the floor slab 11 and the bottom slab 1 is also connected to the joint portion 15 in the same manner as described above (the floor slab 11 and the bottom slab 1 are connected by the menase line). An elastic material is interposed.

The turret-shaped interior material 6 is fixed to appropriate locations on the upper surfaces of the inner bottom slab 1 and the floor slab 11 of the side wall 2 by bolts, nuts, or the like.

This interior material 6 consists of a thin inner tank 16 made of stainless steel, and a cold insulating material 17 such as urethane foam placed on the outer surface of this inner tank 16.

This inner tank 16 is in direct contact with the liquefied gas.

Note that 18 is the roof.

In the underground tank configured as described above, the bottom plate 1 is connected to the side wall 2.
Since the bottom plate 1 can be moved independently of the bottom plate 1, even if a load is applied to the bottom plate 1, it is possible to prevent the side wall 2 from being subjected to large bending stress as in the embodiment shown in FIG.

In addition, the center part of the bottom of the interior material 6 is fixed to the bottom plate 1Q,
The surrounding area is fixed to the floor slab 11 (separate from the bottom slab 1), so even if the bottom slab 1 and the side walls 2 move differently, the fixing point between the interior material 6 and the bottom slab 1 is fixed to the interior The movement relative to the fixed point between the material 6 and the side wall 2 is small, which allows the deformation of the interior material 6 to be within an allowable range,
Destruction of the interior material 6 can be prevented.

Furthermore, even if the upper surface of the bottom slab 1 and the floor slab 11 thermally expand when the temperature rises, the expansion in the radial direction can be absorbed by the elastic material 14 interposed in the joints 13°15. Since the compressive force of the floor slab 11 can be reduced, and the radial width of the floor slab 11 is smaller than that of the conventional example shown in FIG. 2, buckling of the floor slab 11 can be prevented.

Further, even if a radial compressive force is applied to the floor slab 11 during an earthquake, buckling of the floor slab 11 can be prevented for the same reason.

In addition, since the floor slab 11 is separate from the side wall 2, there are inconveniences such as bending stress acting on the connecting portion 9 between the floor slab 7 and the side wall 2, causing this portion to break, as in the conventional example shown in FIG. can be prevented.

Note that the present invention is not limited to the embodiments described above, and various embodiments are possible.

For example, as in the second embodiment shown in FIG. 5, the joint portion 13 between the floor slab 11 and the side wall 2 may be configured.

In this embodiment, members corresponding to those of the first embodiment described above are designated by the same numbers in FIG. 3, and their explanation will be omitted.

The same applies to the third embodiment described later.

To explain in detail, an elastic material 14 is interposed in this joint portion 13, and the side wall 2 and the floor slab 11 are connected by bolts 20.

This bolt 20 is arranged in a space surrounded by the sheath pipe 21Cζ, so that even if there is relative movement between the side wall 2 and the floor slab 11, its function as a resistor is ensured, and the entire length is It can be used as a resistor.

In addition, the structure of this joint part 13 can also be applied to the joint part 15 between the inner periphery of the floor slab 11 and the bottom slab 1.

Alternatively, as in the third embodiment shown in FIG.

That is, in this embodiment, a plurality of, for example, three floor slabs 30° 31.32 having different diameters are sequentially arranged in the depressed portion 10 of the bottom slab 1.

These floor slabs 30, 3L32, side wall 2, and bottom slab 1 are penetrated by one bolt 33.

This bolt 33 is connected to these side walls 2, bottom slab 1, floor slab 30,
The joints 34 between 31 and 32 are wrapped in tape with a small coefficient of friction or coated with asphalt material in the vicinity to avoid the restraint of the concrete constituting the above members and effectively act as a resistor. It is supposed to be done.

Further, each joint portion 34... (here, an elastic material 35...) is interposed.

With this configuration, the thermal expansion of the bottom slab 1, the floor slabs 30, 31, 32 can be absorbed by the elastic materials 35 of the many joints 34, and the thermal expansion of the floor slabs 30, 31, 32 can be absorbed. Since the width in the radial direction is small, the buckling phenomenon of these floor slabs 30, 31, 32 can be more reliably prevented.

Note that 36 in the figure is a leveling plate made of concrete.

As explained above, in the present invention, a depression is formed in the periphery of the bottom slab, the floor slab is housed in this depression, and the tower-shaped interior material is fixed to the inner surface of the side wall, the bottom slab, and the top surface of the floor slab. It is something.

Therefore, even if the bottom plate and the side walls move differently, the deformation of the interior material can be suppressed within an allowable range, and destruction of the interior material can be prevented.

In addition, elastic material is interposed in the joints between the floor slab, side walls, and bottom slab, and the width of the floor slab in the radial direction is small. It can be prevented.

Furthermore, since the floor slab is separate from the side wall, it is possible to prevent problems such as bending stress acting on the joint between the floor slab and the side wall, resulting in damage.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 are diagrams showing the main parts of different conventional underground tanks, Fig. 3 and Fig. 4 show the first embodiment of the present invention, and Fig. 3 shows a part of the underground tank. 4 is an enlarged sectional view of the main part, and FIGS. 5 and 6 are enlarged sectional views of the main part showing the second and third embodiments of the present invention, respectively. 1... Bottom plate, 2... Side wall, 3, 4...
...Stepped portion, 5...Supporting member, 6...
・Interior material, 8... Sliding material, 10... Depression, 11... Floor slab, 13, 15... Joint part, 14... ...Elastic material, 30, 31, 32...
... Floor slab, 34 ... Joint section, 35 ...
...Elastic material.

Claims (1)

[Scope of utility model registration request] A stepped portion is formed at the peripheral edge of the bottom plate and the lower end of the side wall, and these stepped portions are brought into contact with each other via a support member, and a recessed portion is formed at the periphery of the upper surface of the bottom plate, and this recessed portion is is stored so that its top surface is flush with the top surface of the bottom slab, elastic material is interposed between the outer periphery of the floor slab and the side wall, and the joint between the inner periphery of the floor slab and the bottom slab, and the floor slab An underground tank for liquid gas storage, characterized in that a slipping material is interposed between the bottom plate and the bottom plate, and a turret-shaped interior material is fixed to appropriate locations on the inner surface of the side wall, the floor plate, and the upper surface of the bottom plate.