JPH04258599A - Construction method for underground buried tank - Google Patents

Abstract

PURPOSE:To completely bury a low temperature storage tank in the earth. CONSTITUTION:A vertical pit is excavated in the earth, and after a cylindrical concrete tank body 2 with bottom is constructed in the vertical pit, an inner tank 1 for accommodating low temperature liquefied gas is provided in the concrete tank body 2, the upper opening part of the above concrete tank body 2 is covered with a strong roof member 3, and banking is performed on the strong roof member 3 to form a flat ground level.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for an underground tank in which the tank is completely buried underground.

0002

2. Description of the Related Art Generally, low-temperature liquefied gases such as LNG and LPG are stored in low-temperature tanks. There are two types of low-temperature tanks: above-ground tanks that are installed above ground, and underground tanks that are installed underground.In underground tanks, the part that stores the low-temperature liquefied gas is installed underground, and the roof part is exposed above the ground.

0003

[Problem to be solved by the invention] By the way, in recent years, when installing a low temperature tank, it has been proposed to bury the tank in order to effectively utilize land, especially in urban areas due to the effects of soaring land prices. . In other words, the idea is to bury the low-temperature tank completely underground and make effective use of the above-ground area above the tank. Furthermore, in order to effectively utilize the space above the above-mentioned above-mentioned above-mentioned or underground existing tanks, it has been proposed to bury the existing tanks. However, since conventional tank roofs are dome-shaped metal roofs that evenly receive the internal pressure of the tank, it is difficult to support the earth load on the roof with only the metal roofs.

[0004]The present invention has been made in consideration of these circumstances, and its purpose is to provide a construction method for an underground tank that makes it possible to completely bury a low-temperature tank. be.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention constructs a vertical hole underground, forms a cylindrical concrete tank with a bottom in the vertical hole, and then creates a concrete tank inside the concrete tank. In addition to providing an inner tank for storing low-temperature liquefied gas, the upper opening of the concrete tank body is covered with a strong roofing member, and embankment is applied on top of this strong roofing member to form a flat ground surface. be.

[0006]

[Operation] By forming a concrete tank body in a pit built underground, an inner tank can be provided within the tank body, and an existing tank can also be installed in place of the inner tank. Since the upper opening of the tank body is covered with a strong roofing member, even if embankment is placed on top of this strong roofing member, the soil load is supported by the strong roofing member, so it is not possible to completely bury the cryogenic tank. By making the embankment on the strong roof member a flat ground surface, it becomes possible to effectively utilize the above-ground area above the tank.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates an inner tank for storing low-temperature liquefied gas such as LNG, LPG, etc., and this inner tank 1 is provided in a concrete tank body 2 constructed underground.

[0009] The upper opening of the concrete tank body 2 is provided with a flat plate-shaped roof portion 4 made of concrete, which is the main component of the strength roof member 3. The roof part 4 is provided at a position lower than the ground, and embankment is applied on top of the roof part 4 to form a flat ground surface.

Several independent structures (poles) 5 are erected around the concrete tank body 2, and the upper portions of these structures 5 extend above the ground. A plurality of reinforcing materials 6 such as wires and round steel are connected to the upper part of these frames 5, and these reinforcing materials 6 are connected to the roof portion 4 and its formwork (not shown) to increase the strength and strength of the roof portion 4. has been reinforced.

[0011] To construct the above-mentioned tank, first, the ground is excavated and a pit is constructed underground. A cylindrical concrete tank body 2 with a bottom is formed (constructed) in the vertical hole in which an inner tank 1 for storing low-temperature liquefied gas is installed.

Next, the inner tank 1 is provided within the concrete tank body 2, or an existing tank is moved and placed in the concrete tank body 2 instead of the inner tank 1. Also,
An independent frame (pole) 5 is constructed at any location around the concrete tank body 2 so that its upper part extends above the ground.

Next, in order to cover the upper opening of the concrete tank body 2, a formwork for forming the roof 4 is formed therein, and this formwork and the upper part of the frame 5 are connected by a plurality of wires, circular wires, etc. They are connected with a reinforcing material 6 such as steel, and the formwork is supported by the reinforcing material 6.

[0014] Then, concrete is poured to form the roof part 4.
form.

[0015] As described above, by covering the upper part of the concrete tank body 2 with the concrete roof part 4, even if embankment is applied on the roof part 4 to form a flat ground surface,
Since the soil load is supported by the roof part 4, the concrete tank body 2 can be completely buried. This results in
It is possible to construct a buried low-temperature tank, making it possible to effectively utilize the above-ground area above the tank.

Furthermore, since the formwork is supported by a plurality of reinforcing members 6, its strength is reinforced, so even if the diameter of the tank becomes large, the concrete load during concrete pouring of the roof section 4 can be reduced. It can be sufficiently supported by the formwork, and the roof part 4 can be poured with concrete without worrying about the strength of the formwork. Thereby, the thickness of the roof portion 4 can be made thinner than when the roof portion is formed alone. Further, after forming the concrete roof portion 4, the reinforcing material 6 and the frame 5 may be removed, or the frame 5 and the like may be left in place to effectively utilize the above ground portion of the tank.

Furthermore, when the diameter of the tank increases, the roof and its formwork become considerably thicker, but the roof 4
If the roof or its formwork is supported by a plurality of reinforcing members 6, the roof portion 4 has sufficient strength to withstand the earth load, so it can support the earth load. Thereby, a large-capacity buried tank can be constructed without increasing the thickness of the roof portion 4 or its formwork.

FIG. 2 is a diagram showing a second embodiment, and the difference from the above embodiment is that a plurality of reinforcing materials 7 such as wires and round steel for reinforcing the strength of the roof 4 are attached to the concrete tank body 2. This is where it is connected to the upper part of the side.

In this case, when forming (building) the concrete tank body 2, it is necessary to form a connecting part 8 for connecting the reinforcing material 7 on the upper side of the concrete tank body 2, and to change the shape of the roof part 4. A tank is constructed in substantially the same manner as in the embodiment described above, except that when forming a frame (not shown), this form and the upper side of the concrete tank body 2 are connected with reinforcing members 7. In this case as well, since the roof part 4 and its formwork are supported by the side part of the concrete tank body 2 through the reinforcing material 7, the same effect as in the above embodiment is achieved, and furthermore, the reinforcing material 7 is Since the reinforcing material 7 is connected to the upper side of the tank body 2, it is buried together with the concrete tank body 2. Therefore, the reinforcing material 7 is completely buried without being exposed on the ground surface, and the above-ground part above the tank is further covered. It can be used effectively.

FIG. 3 is a view showing a third embodiment, and the difference from the above embodiment is that a strength roof member 13 covers the upper opening of the concrete tank body 2 and a roof portion 10 formed by the strength member. , an inner tank roof 11 formed of a strength member, and a beam 12 connecting these roof parts 10 and the inner tank roof 11, and a strength roof member 13
The structure was designed to support the soil load applied to the area.

In this case, when the upper opening of the concrete tank body 2 is covered with the roof part 10, the inner tank roof 11 formed by the roof part 10 and the strength member inside the concrete tank body 1 is A tank was constructed in substantially the same manner as in the above embodiment, except that the roof part 10 was connected to an anchor 14 etc. driven at an arbitrary position on the upper part of the concrete tank body 2. Ru. This also ensures that the soil load is sufficiently supported by the roof portion 10 and the inner tank roof 11. That is, even if the diameter of the tank becomes large and the strength of the roof part 10 against the soil load becomes insufficient, the roof part 10 is connected to the inner tank roof 11 formed of a strength member via the beam 12. Therefore, the earth load is supported by the strength roof member 13. This eliminates the need to use a concrete roof with a thickness of about 3000 mm, and the roof 10 can be made thinner and more economical than a concrete roof. Become.

[0022]

In summary, according to the present invention, an inner tank is provided in a concrete tank body, the upper opening of the concrete tank body is covered with a strong roof member, and an embankment is placed on the strong roof member to flatten the tank. Since the ground surface is formed to be flat, a completely buried low-temperature tank can be constructed, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a second embodiment of the invention.

FIG. 3 is a schematic cross-sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

1 Inner tank 2 Concrete tank body 3.Strength roof members

Claims (1)

[Claims] Claim 1: After constructing a shaft underground and forming a bottomed cylindrical concrete tank in the shaft, an inner tank for storing low-temperature liquefied gas is provided in the concrete tank; 1. A construction method for an underground tank, characterized in that the upper opening of the tank is covered with a strong roof member, and embankment is applied on the strong roof member to form a flat ground surface.