JP2001234553A - Construction method for storage equipment for high pressure gas in bedrock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction period and cost. SOLUTION: The storage structure is provided with a lining layer 14 formed at the internal face of a cave 12, a pressure-resistant buffer layer 16, and an air-tight material 18, formed in bedrock 10. When constructing the storage structure, the bedrock is excavated to form the cave 12, and further, the lining layer 14 is formed to cover the excavated face of the cave 12. After the lining layer 14 has been formed, forms are installed in the inside of the lining layer 14a and reinforcements 24 and a joint material 26 dividing concrete to be placed thereafter into a plurality of sections along the peripheral and axial directions are arranged. Then, concrete is placed in the space 22. When the forms are removed, the storage structure in the bedrock is constructed as the outer peripheral edge of the air-tight material 18 is welded to the joint material 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a storage facility for high-pressure gas in rock.

[0002]

2. Description of the Related Art As a method of constructing a facility for storing gas such as city gas at high pressure in a rock, for example, a hollow portion is excavated and formed in a rock by a tunnel construction method,
A method of back-fixing a reinforced concrete segment and providing an airtight material such as a metal lining on the inner surface of the segment has been studied.

[0003] In a storage facility constructed by such a construction method, airtightness is ensured by an airtight material such as a metal lining.
It has a composite structure that allows pressure resistance to be maintained by the bedrock, and even transmission of internal pressure by the segments and the backfill layer.

[0004] However, such a method of constructing a storage facility for high-pressure gas in a rock has the following technical problems.

[0005]

That is, the storage facility in the bedrock, after excavating a cavity in the bedrock, installs a segment along the inner surface side and fixes it with backfill material. Since it is a construction procedure to install the airtight material in post-construction,
There is a problem that the work of installing the segment at a predetermined position is complicated, the construction period is lengthened, and the construction cost is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a high-pressure gas storage facility for a high-pressure gas in a rock, which can shorten the construction period and reduce the construction cost. It is to provide a construction method.

[0007]

According to the present invention, a lining layer is formed on an inner surface of a hollow portion formed by rock excavation, and a predetermined space portion is formed on an inner surface side of the lining layer. After installing the formwork, concrete is poured into the space to form a pressure-resistant buffer layer that covers the lining layer,
After removing the mold, a method for constructing a high-pressure gas storage facility in a rock mass for covering an airtight material such as a metal lining on the inner surface side of the pressure-resistant buffer layer, and before placing the concrete, While applying a predetermined reinforcing bar in the space,
A joint material for dividing the poured concrete into a plurality of pieces along the circumferential and axial directions is installed, and a peripheral edge of the airtight material is fixed to the joint material, and is covered on the inner surface side of the pressure-resistant buffer layer. I made it. According to the construction method of the high-pressure gas in-bed storage facility configured as described above, the pressure-resistant buffer layer is cast and formed at the construction site using the formwork. , And as a result, the construction cost can be reduced, and a special production yard is not required. Further, in the method for constructing a storage facility in a rock according to the present invention, a joint material for applying a predetermined reinforcing bar in a space defined by a formwork and dividing a poured concrete into a plurality of pieces along a circumferential direction and an axial direction. Is installed, the periphery of the airtight material is fixed to the joint material, and the airtight material is covered on the inner surface side of the pressure-resistant buffer layer. When the airtight material is fixed to the joint material in this way, the airtight material is divided at least in the circumferential direction at the joint material portion. Therefore, when a high-pressure gas is accommodated in the storage facility, when a force acting to expand the inner diameter of the airtight material and the pressure-resistant buffer layer acts, it becomes possible to deform the joint material, and the airtight material and Deformation followability can be ensured without damaging the pressure-resistant buffer layer. As the mold, a full-section mold that covers the entire inner periphery of the lining layer formed in an annular shape can be used. Use of such a mold further improves workability.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Figure 1
FIG. 4 shows an embodiment of a method for constructing a high-pressure gas in-rock storage facility according to the present invention.

The storage facility in the bedrock constructed by the construction method of the present embodiment has a bedrock 10 as shown in FIG.
Lining layer 1 formed on the inner surface of cavity 12 formed therein
4, a pressure-resistant buffer layer 16 formed on the inner surface of the lining layer 14 so as to cover it, and an airtight material 18 provided on the inner surface of the pressure-resistant buffer layer 16.

[0010] When constructing a storage facility in a rock mass having such a structure, first, as shown in FIG. The hollow portion 12 is excavated by, for example, a tunnel boring machine.

When the cavity 12 having a predetermined shape is formed, a lining layer 14 is formed so as to cover the excavated surface of the cavity 12. The lining layer 14 is formed to have a predetermined thickness by, for example, spraying mortar or concrete, and in the case of the present embodiment, the vertical cross section is annular.

When the lining layer 14 is formed, next, as shown in FIG. 2, a mold 20 is placed on the inner surface side of the lining layer 14. The formwork 20 shown in the figure is a so-called full-section centre formwork provided with a crown portion 20a, a side portion 20b, and an invert portion 20c hinged to each other, and has a structure that can be reduced in diameter and expanded in diameter. It has become.

When installing the formwork 20, the lining layer 1
4 are set at a predetermined distance from the inner surface of the inner surface 4 and a space 22 is defined therebetween. The space 22 defined in this way
Inside, reinforcing bars 24 assembled in a cage shape in advance are provided.

In the space 22, together with the reinforcing bars 24, a joint material 26 for dividing concrete to be cast thereafter into a plurality of pieces along the circumferential and axial directions is installed.
The joint material 26 of the present embodiment is obtained by stacking two channel steel plates having a predetermined thickness, has a length substantially corresponding to the thickness of the space 22, and the steel plates are simply flat. The rear surfaces are in contact with each other. In addition,
The joint material 26 is not limited to a steel material having such a shape, and may be, for example, an L-shaped steel material or hard plastics.

Further, the joint members 26 are separated from the form 20 when the form 20 is removed after the concrete has been poured. When the installation of the reinforcing bars 24 and the joint members 26 in the space 22 is completed, concrete is poured into the space 22.

At the time of casting the concrete, since the flow of the concrete is prevented by the joint material 26, the concrete is filled in each portion partitioned by the joint material 26.

Then, the mold 20 is released at the stage when the strength of the poured concrete is developed. When the mold 20 is removed from the mold, a pressure-resistant buffer layer 16 made of reinforced concrete is formed on the inner surface side of the lining layer 14.
As shown in FIG. 3, each of the segments is divided into a plurality of segments along the circumferential and axial directions by the joint material 26.

When such a pressure-resistant buffer layer 16 is obtained,
When the tip of the joint material 26 is cut out to expose its metal surface, and the outer peripheral edge of the hermetic material 18 made of a metal lining such as a steel plate is welded to the joint material 26, the rock storage facility having the structure shown in FIG. Is constructed.

Now, according to the construction method of the in-rock storage facility constructed as described above, the pressure-resistant buffer layer 16 is
Since it is cast and formed at a construction site using, the construction period can be shortened as compared with the case of using segments, and as a result, the construction cost can be reduced.

In this case, unlike the case of using a segment, a custom-made formwork and a dedicated manufacturing yard are not required.
Since the weight of the on-site carrying member is also reduced, these points also contribute to shortening the construction period and the cost.

Further, according to the method for constructing a storage facility in a bedrock of the present invention, a predetermined reinforcing arrangement 2 is provided in a space 22 defined by a formwork 20.
4, a joint material 26 for dividing the poured concrete into a plurality of pieces along the circumferential and axial directions is installed, and the peripheral edge of the airtight material 18 is welded to the joint material 26 to form the pressure-resistant buffer layer 1.
6 on the inner surface side.

When the airtight material 18 is welded to the joint material 26 in this manner, at least in the circumferential direction, the airtight material 18 is welded.
Is divided at the joint material 26.

For this reason, when a high-pressure gas is accommodated in the storage facility and an action force for expanding the inner diameters of the airtight material 18 and the pressure-resistant buffer layer 16 is applied, the joint material 26 and the joint material 26 By increasing the distance, it can be deformed.

For this reason, the deformation followability can be ensured without damaging the airtight material 18 and the pressure-resistant buffer layer 16.

Further, in the case of this embodiment, since the mold 20 is a full-section mold that covers the entire inner periphery of the lining layer 14 formed in a ring shape, the workability is further improved.

In the above embodiment, the case where the construction method according to the present invention is applied to a storage facility in a rock having a circular cross section is exemplified. However, the present invention is not limited to this. It can also be applied to storage facilities with cross sections or polygonal cross sections.

[0027]

As described above in detail, according to the method for constructing a high-pressure gas in-rock storage facility according to the present invention,
Shortening of the construction period and reduction of the construction cost are achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a method for constructing a high-pressure gas in-rock storage facility according to the present invention at an initial stage of construction.

FIG. 2 is an explanatory sectional view of a step performed subsequent to FIG. 1;

FIG. 3 is an explanatory cross-sectional view of a step performed subsequent to FIG. 2;

FIG. 4 is an explanatory cross-sectional view of a step performed subsequent to FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rock 12 Cavity part 14 Lining layer 16 Pressure-resistant buffer layer 18 Airtight material 20 Formwork 22 Space part 24 Arrangement 26 Joint material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunifumi Takeuchi 2-15-2 Konan, Minato-ku, Tokyo Obayashi Gumi head office (72) Inventor Daihachi Okai 4-1-1 Hiranocho, Chuo-ku, Osaka-shi, Osaka No. 2 Inside Osaka Gas Co., Ltd. (72) Inventor Naofumi Kagawa 4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture F-term in Osaka Gas Co., Ltd. (Reference) 2D047 AB02 2D055 AA10 CA01 CA03 CA04 DA01 KB04 KB05 KB11 KC00 3E072 AA03 BA07 DA05

Claims (2)

[Claims] 1. A lining layer is formed on an inner surface of a hollow portion formed by rock excavation, a predetermined space is provided on an inner surface side of the lining layer, a formwork is installed, and concrete is poured into the space. Casting to form a pressure-resistant buffer layer that covers the lining layer, and after removing the mold, pressurized gas-filled rock that covers an airtight material such as a metal lining on the inner surface side of the pressure-resistant buffer layer. A method for constructing a storage facility, comprising: before placing the concrete, applying a predetermined reinforcing arrangement in the space portion, and dividing the placed concrete into a plurality of pieces along a circumferential direction and an axial direction. A method for constructing a high-pressure gas in-rock storage facility, comprising: fixing a peripheral edge of the airtight material to the joint material and covering the inner surface of the pressure-resistant buffer layer. 2. The method according to claim 1, wherein the mold is a full-section mold covering an inner circumference of the lining layer formed in an annular shape. .