JPH07247726A - Ground and underground monolithic tank for low temperature liquefied-gas, and construction method thereof - Google Patents

Abstract

PURPOSE:To store a large volume of liquefied gas by constructing a ground section of a concrete wall arranging a double metal wall on the inside and a roof on an underground section consisting of a bottom slab provided with a heat insulating material and a membrane to the inside thereof and side walls. CONSTITUTION:An underground continuous wall 5 is so provided in the ground in a cylindrical shape that it reaches a water impermeable layer 3, and the underground continuous wall 5 is used for a cut-off wall and an earth retaining wall to excavate the inside thereof up to specific depth. After that, a reinforced concrete bottom slab 7 and side walls 9 are constructed in an excavated part, PC walls 11 are constructed in a cylindrical shape on the upper parts of the side walls 9 and, at the same time, internal tank metals 15a are arranged to them. Then, seal metals 31 are provided between the PC walls 11 on the upper parts of the side walls 9 and internal tank metals 15a, at the same time, a roof 13 is constructed on the upper part of the bottom slab 7, and a heat insulating material 19 is provided between internal and external tank metal roofs 15 and 17 and between the PC walls 11 and internal tank metals 15a. The roof 13 is lifted, the internal tank metals 15a and internal tank metal roof 15 are welded, the seal metals 31 and external tank metal roof 17 are welded, a membrane 22 is provided to the inside of a heat insulating material 21, and the roof 13 is placed on a tank.

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 with underground and a method for constructing the same.

[0002]

2. Description of the Related Art Conventionally, there are underground and aboveground tanks for storing low-temperature liquefied gas such as LNG. Regarding the roof structure of these tanks, steel is used for the above-ground type and steel or concrete is used for the underground type, and the maximum diameter is about 70-80m from the viewpoint of structure and economy. Is the limit.

[0003]

By the way, recently, there is a demand for a tank capable of storing a large volume of low-temperature liquefied gas. However, as mentioned above, there is a limit to the diameter of the roof of the tank, 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.

Further, in the case of the above-ground type, the height may be limited due to the conditions of the site environment, and in the case of the underground type, the size of the water blocking wall for stopping water or the earth retaining wall for retaining soil is large. Due to the depth limitation, the ground tanks have a maximum liquid depth of about 33 m and a capacity of 140,000 KL, and the underground tanks have a maximum depth of about 50 m and a capacity of up to 200,000 KL. Has become.

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

[0006]

In order to achieve the above-mentioned object, a first aspect of the invention is to provide a bottom slab and a side wall in an underground part, and to provide a heat insulating material and a membrane inside the bottom slab and the side wall. A low-temperature liquefied gas tank integrated with a subterranean ground, characterized in that a concrete wall is provided on the side wall in the above-ground portion, and a wall made of a double metal and a roof are provided inside the concrete wall.

A second aspect of the invention is to provide an earth retaining wall or a water stop wall in the ground, excavating the earth retaining wall or the water stop wall to a predetermined depth, and a bottom plate and a slab at the excavated portion. 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 the upper side of the side wall, a step of providing a double metal wall on the upper side of the side wall, And a step of installing a roof made of a double metal on a double metal wall, which is a method of constructing an underground-ground integrated low-temperature liquefied gas tank.

[0008]

In the present invention, a large amount 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 now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an outline of an underground-ground integrated low temperature liquefied gas tank according to an 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 the impermeable layer. 5 is an underground continuous wall provided in a cylindrical shape so as to reach the impermeable layer, 7 is a bottom plate made of reinforced concrete, 9 is a substantially cylindrical side wall made of reinforced concrete, 11 is a cylinder provided above the side wall 9. -Shaped prestressed concrete wall (PC wall), 13 is a roof,
This roof 13 has a PC outer tank metal double shell structure in which a heat insulating material 19 is provided between an inner tank metal roof 15 and an outer tank metal roof 17. The heat insulating material 19 is also installed between the PC wall 11 and the inner tank metal 15a. Reference numeral 21 is a heat insulating material provided on the inner surfaces of the bottom plate 7 and the side wall 9, 22 is a membrane provided inside the heat insulating material 21, and 23 is LNG (liquefied natural gas) to be stored.

Next, a method of constructing the low temperature liquefied gas tank integrated with the underground will be described with reference to FIGS. 3 to 8.

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

Next, at the upper portion of the side wall 9, the PC wall 11
A seal metal 31 is provided between the inner tank metal 15a and the inner tank metal 15a, and the roof 13 is constructed on the upper portion of the bottom plate 7. This roof 13 has a structure in which a heat insulating material 19 is provided between an inner tank metal roof 15 and an outer tank metal roof 17 (FIG. 7). The heat insulating material 19 is also installed between the PC wall 11 and the inner tank metal 15a.

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

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

[0015]

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

[Brief description of drawings]

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

FIG. 2 is an enlarged view of part A of FIG.

[Figure 3] Explanatory drawing of the construction method for the underground low-temperature liquefied gas tank

[Fig. 4] An explanatory view of the construction method of the underground low temperature liquefied gas tank integrated with the ground

[Fig. 5] An explanatory view of the construction method of the underground low temperature liquefied gas tank integrated with the ground

[Fig. 6] An explanatory view of a construction method of a low temperature liquefied gas tank integrated with underground

[Figure 7] Explanatory drawing of the construction method for the underground low-temperature integrated liquefied gas tank

[Fig. 8] An explanatory view of a construction method of an underground low temperature liquefied gas tank integrated with ground

[Explanation of symbols]

 1 ………… Ground surface 3 ………… Impermeable layer 5 ………… Continuous underground wall 7 ………… Bottom plate concrete 9 ………… Side wall concrete 11 ………… PC wall 13 ………… Roof 15 …… … Inner tank metal roof 17 …… Outer tank metal roof 19 ………… Insulation material for aboveground tank 21 ………… Insulation material for underground tank 22 ………… Membrane 23 ………… LNG

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shizuo Naito 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Within Kashima Construction Co., Ltd. (72) Shinji Nakagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Koichiro Kanai 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hidetoshi Kashima 12 Nishiki-cho, Naka-ku, Yokohama-shi Kanagawa (72) Inventor Yasutaka Osawa 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries, Ltd. Yokohama Works

Claims (2)

[Claims] 1. An underground part is provided with a bottom slab and a side wall, a heat insulating material and a membrane are provided inside the bottom slab and the side wall, and a ground wall is provided with a concrete wall on the side wall. A low-temperature liquefied gas tank integrated with the underground, characterized in that a double metal wall and a roof are provided inside the wall. 2. A step of providing an earth retaining wall or a water blocking wall in the ground, a step of excavating the inside of the earth retaining wall or the water stopping wall to a predetermined depth, and a step of providing a bottom slab and a side wall at 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 side of the side wall, a step of providing a double metal wall on the upper side of the side wall, the double metal wall The method for constructing a low-temperature liquefied gas tank integrated with an underground surface, comprising the steps of installing a double-metal roof on the ground.