JP2787840B2 - Underground integrated low temperature liquefied gas tank and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature liquefied gas tank integrated underground and above, and a method for constructing the tank.

[0002]

2. Description of the Related Art Conventionally, tanks for storing low-temperature liquefied gas such as LNG are available underground and above ground. Speaking of the roof structure of these tanks, they are made of steel for the above-ground type and made of steel or concrete for the underground type, and their diameters are at most 70 to 80 m from the viewpoint of structure and economy. Is the limit.

[0003]

In recent years, there has been a demand for a tank capable of storing a larger volume of low-temperature liquefied gas. However, as mentioned above, the diameter of the tank roof is limited, so in order to increase the capacity of the tank, it is necessary to increase the height in the case of the above-ground type, and to increase the depth in the case of the underground type, This leads to complicated construction and increased costs.

In the case of the above-ground type, the height may be limited due to the conditions of the site environment and the like, and in the case of the underground type, the size of a water stop wall for retaining water or a retaining wall for retaining soil is large. There is a limit due to the increase in depth. At present, the maximum for tanks with a liquid depth of about 33 m and a capacity of 140,000 KL, and those for underground tanks with a liquid depth of about 50 m and a capacity of 200,000 KL is currently the largest. Has become.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an underground integrated low-temperature liquefied gas tank capable of storing a large volume of low-temperature liquefied gas and a method of constructing the tank. Is to provide.

[0006]

Means for Solving the Problems In order to achieve the above object, a first invention provides a base plate and a side wall in an underground part, and a heat insulating material and a membrane inside the bottom plate and the side wall. Provided, on the ground portion, a concrete wall is provided on the side wall, a metal wall made of a double metal is provided inside the concrete wall, and a roof is provided on the metal wall,
This is a low-temperature liquefied gas tank integrated underground, characterized in that it can be stored in the same level as the underground part.

A second invention provides a step of providing a retaining wall or a water blocking wall in the ground, a step of excavating the inside of the retaining wall or the water blocking wall to a predetermined depth, and providing a bottom plate and a bottom plate in the excavated portion. A step of providing a side wall, a step of providing a heat insulating material and a membrane in the bottom plate and the side wall, a step of providing a concrete wall on top of the side wall, and a double metal inside the concrete wall at the top of the side wall. A step of providing a metal wall consisting of: and a step of installing a roof made of a double metal on the double metal wall, and an underground integrated type capable of storing the same level as the underground part in the above ground part This is a construction method for a low-temperature liquefied gas tank.

[0008]

According to the present invention, a large volume of low-temperature liquefied gas can be stored by storing the low-temperature liquefied gas in the underground part and the above-ground part.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an outline of a low-temperature liquefied gas tank integrated with an underground ground according to one embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG. 1 and 2, 1 is the ground surface, and 3 is an impermeable layer. 5 is an underground continuous wall provided in a cylindrical shape so as to reach the impermeable layer, 7 is a slab made of reinforced concrete, 9 is a substantially cylindrical side wall made of reinforced concrete, and 11 is a cylinder provided on the upper part of the side wall 9 Shaped prestressed concrete wall (PC wall), 13 is a roof,
The roof 13 has a PC outer tank metal double shell structure in which a heat insulating material 19 is provided between the inner tank metal roof 15 and the outer tank metal roof 17. The heat insulating material 19 is also provided between the PC wall 11 and the inner tank metal 15a. Reference numeral 21 denotes a heat insulating material provided on the inner surface of the bottom plate 7 and the side wall 9, reference numeral 22 denotes a membrane provided inside the heat insulating material 21, and reference numeral 23 denotes LNG (liquefied natural gas) to be stored.

Next, a method of constructing the low-temperature liquefied gas tank integrated with the underground ground will be described with reference to FIGS.

First, as shown in FIG. 3, an underground continuous wall 5 is provided in the ground in a cylindrical shape so as to reach the impermeable layer 3. Next, the inside of the underground continuous wall 5 is excavated to a predetermined depth using the underground continuous wall 5 as a water stop wall and a soil retaining wall (FIG. 4). Next, a slab 7 and a side wall 9 made of reinforced concrete are constructed in the excavated portion (FIG. 5). Next, the PC wall 11 is constructed in a cylindrical shape on the upper part of the side wall 9 and the inner tank metal 15 a
Is provided (FIG. 6).

Next, the PC wall 1 is located above the side wall 9.
1 and the inner metal 15a are provided with a seal metal 31;
A metal wall made of a double metal consisting of the inner tank metal 15 a and the seal metal 31 is provided inside the C wall 11. Further, a roof 13 is constructed above the bottom slab 7. The roof 13
Insulation material 19 between the inner tank metal roof 15 and the outer tank metal roof 17
(FIG. 7). The heat insulating material 19 is also provided between the PC wall 11 and the inner tank metal 15a.

Next, the roof 13 is lifted, and the inner tank metal 1 is lifted.
5a and the inner tank metal roof 15 are welded to form a seal metal 31.
The roof 13 is welded to the outer tank metal roof 17 by welding.
At the top of the tank. Further, a heat insulating material 21 is provided on the inner surfaces of the bottom plate 7 and the side wall 9, and a membrane 22 is provided inside the heat insulating material 21. Then, the LNG 23 is stored (FIG. 8). As described above, in the present embodiment, the L
Since NG or the like can be stored, it is possible to store a low-temperature liquefied gas having a capacity almost twice as large as that of the conventional case. Specifically,
The inside diameter of the tank can be about 72 m and the liquid depth can be about 82 m, so that about 340,000 m ³ of low temperature liquefied gas can be stored.

Therefore, as compared with a single above-ground tank or underground tank, an increase in capacity can be ensured at the same position, so that the storage capacity per unit area of land can be significantly increased. Therefore, the land can be effectively utilized as a whole, and a large-capacity tank can be constructed on a small site. Further, when storing the same capacity, the cost and the construction period can be shortened as compared with the conventional underground tank only or the above-mentioned tank alone.

[0015]

As described above, according to the present invention, a large amount of low-temperature liquefied gas can be stored.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an outline of a low-temperature liquefied gas tank integrated with an underground surface

FIG. 2 is an enlarged view of a portion A in FIG. 1;

FIG. 3 is an explanatory view of a construction method of an integrated low-temperature liquefied gas tank underground.

FIG. 4 is an explanatory view of a construction method of an underground integrated low-temperature liquefied gas tank

FIG. 5 is an explanatory view of a construction method of an integrated low-temperature liquefied gas tank underground

FIG. 6 is an explanatory view of a construction method of a low-temperature liquefied gas tank integrated with an underground base

FIG. 7 is an explanatory diagram of a construction method of an integrated low-temperature liquefied gas tank underground.

FIG. 8 is an explanatory diagram of a construction method of a low-temperature liquefied gas tank integrated with an underground base.

[Explanation of symbols]

 1 ... ground surface 3 ... impervious layer 5 ... continuous underground wall 7 ... bottom slab concrete 9 ... side wall concrete 11 ... PC wall 13 ... roof 15 ... … Inner tank metal roof 17 …… Outer tank metal roof 19 …… Insulation material for above-ground tanks 21 …… Insulation material for underground tanks 22 …… Membranes 23 …… LNG

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shizuo Naito 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Shinji Nakagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Koichiro Kanai 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Yokohama Works (72) Inventor Yasutaka Osawa 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Works (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 7/02-7 / 18 E02D 29/045-29/05 E21D 13/00-13/02 F17C 3/00-3/06

Claims (2)

(57) [Claims] A bottom plate and a side wall are provided in an underground portion; a heat insulating material and a membrane are provided inside the bottom plate and the side wall; a concrete wall is provided on the side wall in a ground portion; Inside the wall, a metal wall made of double metal
The roof is installed on the metal wall,
A low-temperature liquefied gas tank integrated underground with the same storage capacity . 2. A step of providing a retaining wall or a water blocking wall in the ground, a step of excavating the inside of the retaining wall or the water blocking wall to a predetermined depth, and a step of providing a bottom plate and a side wall in the excavated portion. A step of providing a heat insulating material and a membrane in the bottom plate and the side wall; a step of providing a concrete wall on the upper part of the side wall;
Land that allows the step of providing a metal wall made of metal, and a step of installing a roof made of a double metal to said double metal wall, comprising a storage comparable to the underground to aboveground <br Construction method of low temperature liquefied gas tank integrated on substrate.