JP3185241B2 - How to build an underground cryogenic tank - 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 of constructing a new underground cryogenic tank, and more particularly to a method of constructing an underground cryogenic tank capable of constructing a tank without being affected by the weather. .

[0002]

2. Description of the Related Art Generally, an underground type low temperature tank is known as a tank for storing low temperature liquids such as LPG and LNG. 2. Description of the Related Art Conventionally, as shown in FIG. 2, this underground type low-temperature tank first buries a bottomed cylindrical concrete tank body a having an open upper part in the basement, and then inserts it into an opening b of the concrete tank body a. An annular body plate c1 and a knuckle plate c are attached along the circumferential direction, and a dome-shaped roof d that covers the opening is assembled in the tank body a.

After assembling the dome-shaped roof d in the tank body a, the roof d is raised in the tank body a by the air-raising or jack-up method, and the base end of the roof d is attached to the knuckle plate c. Connected and installed.

On the roof d, a suspended deck f for supporting a cold insulator layer e covering the upper opening b of the tank body a is suspended. This suspended deck f is located at the bottom of the concrete tank body a.
It is attached to the roof d at the same time when the roof d is assembled. Therefore, when the roof d is moved up by the air-raising method or the like, the suspended deck f is also transferred. As described above, after the dome-shaped roof d is attached to the upper opening of the concrete tank body a, a cold insulator layer g is provided inside the concrete tank body a via the cold insulator layer g. A membrane panel forming the inner tank h is stretched to complete the underground low-temperature tank.

[0005]

In the construction of a conventional underground low-temperature tank, especially in a conventional method of assembling a roof, excavation work and concrete work are performed to construct a concrete tank body a underground. After completing the casting work,
After assembling the roof d in the tank body and moving it up by jacking up or aeraging method, it will be attached to the tank body a of the tank. There was a problem that the assembly of d could not be performed at all.

If the roof d is not attached to the upper opening b of the concrete tank a, there is a problem that the inner tank h cannot be assembled by attaching the cold insulator layer g to the inner wall of the tank. That is, when moisture enters the cold insulating material layer g, the cold insulating performance is impaired.

Therefore, the present invention has been devised in order to effectively solve the above-mentioned problems, and an object of the present invention is to improve a conventional method of constructing an underground low-temperature tank, which is affected by the weather. It is an object of the present invention to provide a method of constructing an underground low-temperature tank that enables the construction of an underground low-temperature tank without any problems and shortens the construction period of the entire tank.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a continuous wall which is formed in the ground and is connected to a cylindrical body which defines a body shell of an outer tank. The inside of the upper part is excavated to a predetermined depth, the upper part of the concrete wall is cast, the body plate supporting the roof is attached to the concrete wall, and then the back wall is back-filled so that the upper part of the continuous wall is covered with the body plate. After forming the roof on the ground part adjacent to the upper part of the continuous wall, forming the roof on the flat ground surface flush with the upper part, transferring the roof along the ground surface and joining it to the body plate, The earth and sand in the wall was excavated, and a concrete wall was cast along the inner wall of the continuous wall to form an outer tank, and the inner tank was formed in the outer tank.

[0009]

According to the above method, the construction of the tank can be shortened because the continuous wall can be formed in the ground to form the outer tank of the body of the outer tank and the roof can be formed on the ground. .

[0010] After the body plate is attached to the upper part of the continuous wall, the upper part of the continuous wall is backfilled to form a flat ground surface,
Since the roof is transported along the ground surface and attached to the body plate, the roof can be easily transported and installed.

Further, after the roof is attached, the earth and sand in the continuous wall are excavated to form the outer tub and the inner tub, so that these operations are performed indoors and are affected by the weather. There is no.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a construction method of an underground low-temperature tank according to the present invention.

First, as shown in FIG. 1A, a continuous wall connected to a cylindrical body for forming a shell 1 of a body portion of an outer tank by driving concrete sheet piles sequentially into the ground in the circumferential direction. Form 2 Next, an inside of the upper part of the continuous wall 2 formed in a cylindrical shape is excavated to a predetermined depth to lay the upper part of the concrete wall, and the annular body plate supports the roof on the concrete wall. 3 is attached to the upper part of the continuous wall 2 along the circumferential direction. More specifically, only the upper opening of the continuous wall 2 serving as the outer shell 1 is exposed on the ground G, and an annular concrete wall 4 is stretched along the inner peripheral portion of the continuous wall 2. At the same time, the body plate 3 is integrally implanted on the annular concrete wall 4.

Next, as shown in FIG. 1c, the upper opening of the exposed continuous wall 2 to which the body plate 3 is attached is back-filled with soil to the ridge line of the body plate 3 until the height is substantially equal. 2 is formed on a flat ground surface 5. In other words, the ground plate 3 is buried back so as to form the flat ground surface 5 covering the body plate 3 standing up at the opening of the continuous wall 2, and the ground surface 5 is formed by embankment as necessary.

On the other hand, when the continuous wall 2 is formed in the ground, at the same time as shown in FIG.
A dome-shaped roof 7 covering the upper opening of the outer tub is assembled above.

After forming the ground surface 5 and assembling the roof 7 in this way, as shown in FIG. 1D, the assembled roof 7 is placed on the ground surface 5 while being placed on the work base 6. It is transported along the upper opening of the continuous wall 2 along the wall. Here, the work surface plate 6 is removed, the roof 7 is placed on the ground surface 5, and the body plate 3 and the base end of the roof 7 are abutted and fixed.
Further, the backfilled soil is removed and the ground surface 5 is removed to form the ground G.

As described above, when the backfilled soil is removed, the roof 7 is connected to and supported by the body plate 3. Therefore, a suspended deck 8 for supporting a cold insulator layer covering the upper opening of the tank body is suspended or attached to the inside of the roof 7, or a cold insulator without the suspended deck 8 is directly attached to the inner surface of the roof. Can be attached.

After the roof 7 is attached to the continuous wall 2 in this way, a working opening 9 is formed in the roof 7 as shown in FIG. And excavate the soil in the continuous wall 2 to form a bottomed cylindrical space.

As described above, a concrete-walled space is excavated and formed at the same time as a concrete wall 4a is continuously formed below the concrete wall 4 in which the body plate 3 is planted. 1 and stretched inside the continuous wall 2 to become the body 11 of the outer tub 10 sequentially.
To form

After the body 11 of the outer tub 10 is formed as described above, a concrete bottom plate 12 is provided on the bottom of the body 11.
To complete the outer tub 10 made of a concrete with a bottomed cylindrical body, or to excavate the earth and sand in the continuous wall 2 to form a space with a bottomed cylindrical body, and then to crawl at the center of the bottom. A concrete bottom plate 12 is completed by placing a concrete bottom plate 12 on the bottom portion by carrying a small portion of a reinforcing steel material or the like at the bottom. Thereafter, a wall 4a is formed from the bottom with a hoist crane attached to the attic, and concrete is cast and continuously moved upward to form the body 11 of the outer tub 10. After the outer tub 10 is completed, as shown in FIG. 1F, a membrane panel 14 is stretched while forming a cold insulator layer 13 on the inner peripheral wall surface to form a bottomed cylindrical inner tub 15. .

In particular, since the cold insulator layer 13 can be attached to the inner peripheral wall surface of the outer tub 10 in a room where the roof 7 is covered, the work can be continued without being affected by the weather, and the entire tank can be maintained. Construction work can be shortened.

After the inner tank 15 is completed in the outer tank 10, the work opening 9 provided in the roof 7 is closed to close the inside. Further, the cold insulator layer 16 is placed on the suspended deck 8 suspended from the roof 7.

[0023]

The present invention exhibits the following excellent effects.

(1) Part of the tank body can be built in parallel with the assembly of the roof, so that the construction period of the entire tank is shortened.

(2) The construction of the tank body can be performed without being affected by the weather, and the construction period can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic process drawing for explaining a method of the present invention.

FIG. 2 is a schematic side sectional view of an underground low-temperature tank showing a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer shell 2 Continuous wall 3 Body plate 3a Knuckle plate 4 Concrete wall 5 Ground surface 7 Roof 10 Outer tank 11 Body part 15 Inner tank

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiko Ikeuchi 3-2-16-1 Toyosu, Koto-ku, Tokyo Ishikawa-Shimaharima Heavy Industries, Ltd. Toyosu Sogo Office (72) Inventor Hidenori Suzuki Toyosu 3-chome, Koto-ku, Tokyo No. 2-16 Ishikawajima Harima Heavy Industries, Ltd. Toyosu General Office (56) References JP-A-56-67062 (JP, A) JP-A-57-33677 (JP, A) JP-A-49-41054 (JP, A) , B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04H 7/18 E02D 29/045

Claims (1)

(57) [Claims] An outer tank having a bottomed cylindrical shape is formed in the ground, and an inner tank for containing a liquid storage is formed in the outer tank, and a cover for covering upper openings of the inner tank and the outer tank is provided. In the method for constructing an underground low-temperature tank provided with a roof in the form of a base, a continuous wall connected to a cylindrical shape that defines a body shell of the outer tank is cast in the ground, and an upper part of the continuous wall is formed. The concrete wall is excavated to a predetermined depth, the upper part of the concrete wall is cast, the body plate supporting the roof is attached to the concrete wall, and then the back wall is buried and the upper part of the continuous wall is placed on the upper part of the body plate. After the roof is assembled on the ground portion adjacent to the upper portion of the continuous wall, the roof is transferred along the ground surface and joined to the body plate, and then the continuous wall is formed. Excavating earth and sand inside, and laying a concrete wall along the inner wall of the continuous wall to form an outer tub, A method for constructing an underground low-temperature tank, wherein an inner tank is formed.