JP3637511B2 - Crack prevention method in high pressure gas storage facility in bedrock. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention constitutes a high-pressure gas storage container body having a flexible structure that has airtightness in a cavity formed in a rock and allows deformation against an external force such as groundwater pressure in order to store high-pressure gas. advance relates preservation method of the rock in the high-pressure gas storage facilities, especially the distortion due also when the cracks occurred in the rock surrounding the high-pressure gas storage vessels of the flexible structure so as not to progress, the high-pressure gas leakage to The present invention relates to a crack prevention method in a high-pressure gas storage facility in a rock mass.
[0002]
[Prior art]
It has been studied to store high-pressure gas using an underground bedrock without storing it in a spherical tank or a high-pressure gas storage tank.
This method was originally proposed as a water-sealing method that uses the underground rock cavities as they are and stores high-pressure gas using the groundwater pressure around the cavities. However, if the stored gas pressure is set to 100 / c, In order to obtain the groundwater pressure that balances with the internal pressure, the storage space must be formed at a depth of 1000 m or more by simple calculation. In addition to this, there is a problem of leaching into the storage space of the groundwater, and improvement is required. It was.
And as one of the improvement proposals, a storage container that is airtight and allows deformation with respect to external force is formed in the cavity formed in the rock, along the inner wall surface of the cavity, and the storage container A high-pressure gas storage method was proposed in which, when high-pressure gas is sealed inside, the internal pressure is supported by a rock that forms a cavity via a storage container.
In this storage facility 10, as shown in FIG. 7, the ground facility 11 and the storage container 12 in the rock 1 are connected by a shaft 13 for receiving and discharging gas, and the storage container 12 is formed in the rock 1. Then, it is provided inside the cavity 15 supported and reinforced by the lock bolt 14 with a rock wall surface 16 through a pressure transmission layer 17.
The rock wall 16 is entirely lined with shotcrete 18 in order to level the unevenness caused by excavation, and a wall 19 made of cast concrete is further constructed inside the shotcrete, and the pressure transmission layer 17 is formed. Is composed of the shotcrete 18 and the wall 19.
The storage container 12 is assembled on the inner wall surface of the wall body 19 and is configured to maintain airtightness by welding a steel plate. As the material of the steel plate, in addition to general rolled steel, stainless steel and extremely soft steel are also considered, and any material that can be flexibly deformed following high pressure can be adopted.
By configuring in this manner, even if the rock mass 1, the pressure transmission layer 17 and the storage container 12 are closely integrated, and the high pressure gas is received and discharged from the storage container 12, the storage container 12 expands flexibly upon reception. By transmitting the gas pressure to the rock mass 1 through the pressure transmission layer 17, the rock mass 1 substantially supports the gas pressure and can easily return to the original state at the time of dispensing.
[0003]
[Problems to be solved by the invention]
As described above, the conventional method is constructed by integrating the rock mass 1, the pressure transmission layer 17, and the storage container 12 as tightly as possible, taking into consideration only the pressure transmission of the stored gas.
If this is examined in detail, the strain generated in the surrounding rock mass 1 will be transmitted to the pressure transmission layer 17 and the storage container 12 in the same manner, and the strain generated in the rock mass 1 is about the same. As shown in FIG. 8, if a local crack 20 occurs in the rock 1 around the storage container 12 as shown in FIG. It has been found that a similar crack 20 develops in the storage container 12 and may cause leakage of the stored high-pressure gas.
The present invention has been studied in view of such circumstances, and even when a local crack occurs in the rock around the high-pressure gas storage container, it prevents the storage container from cracking. It is intended to provide a crack prevention method in a high-pressure gas storage facility in a rock that prevents leakage of high-pressure gas stored in the rock.
[0004]
[Means for Solving the Problems]
The present invention is directed to an in-rock high-pressure gas storage facility in which a flexible high-pressure gas storage container body is provided in a cavity formed in the rock through a stress transmission layer, and the cavity formed in the rock Between the stress transmission layer built inside and the flexible high-pressure gas storage container body, an insulating material made of a variable flexible material made of spray material or sheet-like material is provided. This is a crack prevention method in a high pressure gas storage facility in a rock that prevents the crack from progressing to a flexible high pressure gas storage container even when a local crack occurs in the rock.
Then, the insulating material is or are arranged in the high-pressure gas storage container side of the flexible structure of the specific stress transfer layer, it may also be pre-installed on the outside of the container body castings.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, a specific embodiment of a crack prevention method in a rock mass high-pressure gas storage facility according to the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional view showing an example of an in-rock high-pressure gas storage facility subjected to a crack prevention method according to the present invention. FIG. 2 is a partial cross-sectional view showing a state in which cracks generated in the rock mass by applying the present invention are prevented without progressing to a high-pressure gas storage container body having a flexible structure, and FIGS. It is process drawing which shows the construction state of the crack prevention method by a partial order sequentially.
Since the high-pressure gas storage facility in the rock to which the present invention is applied is basically the same as that shown in FIG. 7 as a conventional example, the same reference numerals are used to indicate the same parts as in the conventional figure. explain.
FIG. 1 shows a high-pressure gas storage facility, which is constructed in a cavity formed in the rock mass and supported and reinforced by rock bolts as in the past, and a flexible high-pressure gas in the rock mass 1 connected to the ground facility. The storage container body 2 is partially shown in cross section.
The high-pressure gas storage facility subjected to the crack prevention method according to the present invention includes a stress transmission layer 3 and an insulating material 4 made of a variable flexible material on a hollow rock wall 16 excavated in the rock 1 and supported and reinforced by rock bolts 14. And the flexible high-pressure gas storage container body 2 is constructed after the interposition.
The stress transmission layer 3 includes a shotcrete 5 that is lined to level the unevenness caused by excavation of the rock wall 16 and a wall body 6 that is constructed inside the shotcrete 5. The wall body 6 is made of cast concrete 8 and is cast by a normal construction method such as spot casting or precast concrete.
The high-pressure gas storage container body 2 having a flexible structure is assembled to the inner wall surface of the wall body 6, and is configured to maintain high airtightness by connecting a number of steel plates 9 by welding in the width direction and the length direction. The
A flexible insulating material 4 made of a flexible material is provided between the flexible high pressure gas storage container body 2 and the stress transmission layer 3.
The insulating material 4 may be appropriately selected from variable flexible materials such as asphalt, clay, graphite, paraffin, Teflon, rubber, lead, etc., and absorbs and cancels stress applied from one side and does not transmit it to the other side. Any device that exhibits its function may be used.
Since the insulating material 4 has such a function, as shown in FIG. 2, the local crack 10 generated in the surrounding rock mass 1 also entrains the stress transmission layer 3 integrated with the rock mass. Even if cracks develop in the shotcrete 5 and the wall body 6 constituting the stress transmission layer 3, the concentration of stress that develops at the stage of the insulating material 4 is alleviated, so that the wall body 6 strain concentration of well is reduced, in part on the high-pressure gas storage container body 2 of the flexible structure will be prevented from distortion is concentrated, that the high-pressure gas storage container body 2 of flexible structure is broken by the crack It is possible to prevent the high pressure gas from leaking in advance.
[0006]
Next, the construction of the crack prevention method in the rock mass high-pressure gas storage facility according to the present invention will be described with reference to FIGS.
FIG. 3 shows the shotcrete 5 lined to level the unevenness due to excavation on a hollow rock wall 16 excavated in the rock 1. This lining is constructed by a method normally used in civil engineering work for excavating rock, and a smooth wall surface is obtained.
FIG. 4 shows a state in which the wall body 6 is constructed on the surface of the shotcrete 5, and the specific structure of the wall body 6 is made of cast concrete in which reinforcing bars are embedded as described above.
In the present invention, the shotcrete 5 and the wall body 6 are collectively referred to as a “stress transmission layer” 3 and positioned as means for smoothly transmitting the expansion pressure of the flexible high-pressure gas storage container body 2 to the rock. ing.
FIG. 5 shows a state in which the insulating material 4 is provided on the inner surface of the placed stress transmission layer 3. The material of the insulating material is as described above. However, as a method of applying the stress transmission layer 3, a liquid material is sprayed from a nozzle or processed into a sheet shape in advance and the stress transmission layer 3 is subjected to stress transmission. so that paste on the surface of the layer.
FIG. 6 shows a state where the flexible high-pressure gas storage container 2 is provided in the rock wall surface of the rock 1 with the stress transmission layer 3 and the insulating material 4 interposed therebetween. The container body 2 is configured by welding a number of steel plates 9 such as stainless steel and extra soft steel in addition to general rolled steel so as to maintain airtightness, and is flexibly deformed following high pressure.
Regarding the construction of the insulating material made of the flexible type flexible material, the construction method for the stress transmission layer 3 is described with reference to FIG. 5, but when the construction to the stress transmission layer 3 is difficult, the flexible structure high pressure gas storage It is also possible to construct the flexible container body by sticking the same insulating material in advance to individual steel plates constituting the container body 2 at a factory or the like, and bringing the integrated steel sheet to the site. At this time, the insulating material paste to the steel sheet, or to blow those in liquid form from a nozzle, or which is to paste the steel plate had been processed in advance into a sheet.
[0007]
【The invention's effect】
As described above in detail, the crack prevention method in the rock mass high-pressure gas storage facility according to the present invention includes a flexible high-pressure gas storage container body provided through a stress transmission layer in a cavity formed in the rock mass. In order to prevent concentration of partial strain on the container body due to local cracking of the stress transmission layer between the stress transmission layer and the flexible high pressure gas storage container body in the high pressure gas storage facility in the rock mass Because it is provided with an insulating material made of a variable type flexible material made of spray material or sheet-like material , even when a local crack occurs in the rock around the storage container, it has a flexible structure for high-pressure gas storage The effect of preventing the progress of cracks in the container body is exhibited.
[Brief description of the drawings]
[Fig. 1] Partial cross-sectional view of a high-pressure gas storage facility in bedrock [Fig. 2] Partial cross-sectional view showing the crack prevention state of a flexible high-pressure gas storage vessel [Fig. 3] Cross-sectional view of shotcrete construction [Fig. 4] Cross section of wall construction [Fig. 5] Cross section of insulation construction [Fig. 6] Cross section of construction of flexible high-pressure gas storage vessel [Fig. 7] Conventional view of storage facility in bedrock [Fig. Partial cross-sectional view showing cracks
1: Rock bed 2: Flexible high-pressure gas storage container 3: Stress transmission layer 4: Insulating material 5 of deformable flexible material 5: Shotcrete 6: Wall

Claims (3)

In a high-pressure gas storage facility in a rock, where a flexible high-pressure gas storage container is provided through a stress transmission layer in a cavity formed in the rock, between the stress transmission layer and the flexible high-pressure gas storage container In addition, an insulating material made of a deformable flexible material made of a spray material or a sheet-like material for preventing concentration of partial strain on the container body due to local cracks in the stress transmission layer is provided. The crack prevention method in the high-pressure gas storage facility in the bedrock characterized by the feature. The method for preventing cracks in a high-pressure gas storage facility in a rock mass according to claim 1, wherein the insulating material made of a flexible material is arranged on the side of the high-pressure gas storage container body of the flexible structure of the stress transmission layer. The method for preventing cracks in a high-pressure gas storage facility in a rock mass according to claim 1, wherein an insulating material made of a deformable flexible material is previously installed outside the flexible high-pressure gas storage container body.

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