An underground gas storage based on a block-type lining structure

Abstract

This invention discloses an underground gas storage facility based on a segmented lining structure, belonging to the technical field of underground gas storage facilities. It solves the problem of poor airtightness in existing underground gas storage facilities due to the easy damage to the sealing layer. The underground gas storage facility includes: surrounding rock of the cavern; a lining layer, located inside the cavern wall, composed of multiple concrete lining blocks; a sealing layer, located inside the lining layer; and a sealing component, located at one end of the lining layer near the sealing layer, used to seal the structural joint between two adjacent concrete lining blocks. The sealing component is extendable along the opening direction of the structural joint. This invention is used in underground gas storage facilities.

Description

Technical Field

[0001] This invention relates to an underground gas storage facility based on a segmented lining structure, belonging to the technical field of underground gas storage facilities. Background Technology

[0002] Compressed air energy storage is a novel energy storage technology, where compressed air can reach pressures exceeding 10 MPa. To ensure the safety of the storage facility, most projects place it underground, relying on the strength of the rock mass to balance the pressure of the compressed air within. The key to the success of underground gas storage construction lies in its airtightness. Currently, the commonly used sealing method involves installing a sealing layer on the surface of the concrete lining. During normal operation, the high pressure will inevitably cause cracks in the concrete lining. Due to the randomness of crack formation, repeated loading and unloading processes may damage the sealing layer, leading to air leakage from the storage facility. Summary of the Invention

[0003] This invention provides an underground gas storage facility based on a segmented lining structure, which can solve the problem that the sealing layer of existing underground gas storage facilities is easily damaged, resulting in poor airtightness of the gas storage facility.

[0004] This invention provides an underground gas storage facility based on a segmented lining structure, the underground gas storage facility comprising:

[0005] Surrounding rock of the cavern;

[0006] A lining layer is provided on the inner side of the cave wall of the surrounding rock of the cavern, and the lining layer is composed of multiple concrete lining blocks.

[0007] A sealing layer is provided on the inner side of the lining layer;

[0008] A sealing component is disposed at one end of the lining layer near the sealing layer, and is used to seal the joint opening of the structural joint between two adjacent concrete lining blocks; the sealing component is extendable in length along the opening direction of the structural joint.

[0009] Optionally, the lining layer is provided with a plurality of receiving grooves at one end near the sealing layer; the number of receiving grooves is equal to the number of structural joints and their positions correspond to each other;

[0010] The receiving groove is used to receive the sealing component so that the surface of the sealing component near the sealing layer is flush with the inner surface of the lining layer.

[0011] Optionally, the enclosure component includes:

[0012] A sealing plate is installed at the opening of the structural joint to seal the opening of the structural joint.

[0013] A telescopic structure is provided at one end of the closed plate along the opening direction of the structural joint, for telescopically connecting the end of the closed plate to the concrete lining block on the corresponding side.

[0014] Optionally, there are two telescopic structures, which are respectively disposed at both ends of the closed plate along the opening direction of the structural seam.

[0015] Optionally, the telescopic structure includes:

[0016] The elastic element has one end connected to the end of the closed plate and the other end connected to the concrete lining block on the corresponding side.

[0017] The sleeve is fitted onto the elastic member and connected to the concrete lining block on the corresponding side.

[0018] Optionally, the end of the closure plate near the telescopic structure has a first serrated portion;

[0019] The telescopic structure includes:

[0020] The connecting plate has a second serrated portion at its end near the closing plate, and the first serrated portion and the second serrated portion are meshed together.

[0021] The first fastener is used to fix the end of the connecting plate away from the closing plate to the concrete lining block on the corresponding side.

[0022] Optionally, the enclosure component further includes:

[0023] A connecting structure is provided at the end of the closed plate away from the telescopic structure, for connecting the end of the closed plate to the concrete lining block on the corresponding side.

[0024] Optionally, the connection structure includes:

[0025] The second fastener is used to fix the end of the sealing plate away from the connecting plate to the concrete lining block on the corresponding side.

[0026] Optionally, the underground gas storage facility further includes:

[0027] A shielding element is disposed between the sealing layer and the closure assembly, and covers the closure assembly.

[0028] Optionally, the shielding element is geotextile or geomembrane.

[0029] The beneficial effects that this invention can produce include:

[0030] The underground gas storage facility based on a segmented lining structure provided by this invention uses segmented concrete lining blocks to pre-set the position and width of structural joints, and then sets up a length-extendable sealing component to seal the joint between two adjacent concrete lining blocks, which can effectively ensure the airtightness of the gas storage facility. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of an underground gas storage facility provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the longitudinal section of the underground gas storage structure at the joint provided in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the cross-sectional structure of an underground gas storage facility provided in another embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the longitudinal section of the structure at the joint of an underground gas storage facility, provided in another embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the cross-sectional structure at the joint of an underground gas storage structure, provided for another embodiment of the present invention.

[0036] List of components and reference numerals:

[0037] 1. Surrounding rock of the cavern; 2. Concrete lining block; 3. Sealing layer; 4. Structural joint; 5. Sealing plate; 6. Cavity; 7. Sleeve; 8. Elastic component; 9. Connecting plate; 10. First fixing component; 11. Second fixing component; 12. Shielding component. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the embodiments, but the present invention is not limited to these embodiments.

[0039] This invention provides an underground gas storage facility based on a segmented lining structure, such as... Figures 1 to 5 As shown, the underground gas storage facility includes:

[0040] Surrounding rock of the cavern 1;

[0041] The lining layer is located inside the cave wall of the surrounding rock 1 of the cavern, and the lining layer is composed of multiple concrete lining blocks 2.

[0042] The sealing layer 3 is located on the inner side of the lining layer; the inner side of the sealing layer 3 has a cavity 6.

[0043] A sealing component is located at one end of the lining layer near the sealing layer 3, and is used to seal the joint 4 between two adjacent concrete lining blocks 2; the sealing component is extendable in length along the opening direction of the structural joint 4.

[0044] Furthermore, the lining layer is provided with multiple receiving grooves at one end near the sealing layer 3; the number of receiving grooves is equal to that of the structural joints 4, and their positions correspond to each other;

[0045] The receiving groove is used to receive the sealing component so that the surface of the sealing component near the sealing layer 3 is flush with the inner surface of the lining layer.

[0046] In practical applications, the underground gas storage facility for compressed air energy storage is equipped with a concrete lining layer and a sealing layer 3. The concrete lining layer serves as the base material for the sealing layer 3, providing a smooth surface and transmitting the high-pressure gas pressure to the surrounding rock 1 of the cavern. The purpose of the sealing layer 3 is to prevent high-pressure gas leakage.

[0047] When the internal gas pressure reaches 10 MPa or higher, cracks will inevitably appear in the circumferential direction of the concrete lining layer. To control the location of the cracks, a structural joint 4 is pre-set in the circumferential direction of the concrete lining layer, that is, the lining layer becomes a segmented concrete structure. Then, a sealing component is used to seal the joint 4 between two adjacent concrete lining blocks 2 to ensure the airtightness of the underground gas storage facility.

[0048] In this invention, the closure component includes:

[0049] The sealing plate 5 is set at the opening of the structural joint 4 to seal the opening of the structural joint 4; in practical applications, the sealing plate 5 can be a steel plate.

[0050] An expansion joint is provided at one end of the closed plate 5 along the opening direction of the structural joint 4, and is used to expand and contract the end of the closed plate 5 to the concrete lining block 2 on the corresponding side.

[0051] In one specific embodiment of the present invention, there are two telescopic structures, which are respectively set at both ends of the closed plate 5 along the opening direction of the structural seam 4.

[0052] Specifically, the telescopic structure includes:

[0053] The elastic element 8 is connected at one end to the end of the closed plate 5 and at the other end to the concrete lining block 2 on the corresponding side; in practical applications, the elastic element 8 can be a spring.

[0054] The sleeve 7 is fitted onto the elastic element 8 and connected to the concrete lining block 2 on the corresponding side.

[0055] refer to Figure 1 and Figure 2 As shown, the surface of the structural joint 4 is covered by a complete sealing plate 5 (such as a steel plate) that extends for a certain length. The upper surface of the sealing plate 5 is flush with the surface of the concrete lining layer, providing a flat base layer for the sealing layer 3.

[0056] The sealing plate 5 is fixed to the lining concrete on both sides of the structural joint 4 by a telescopic structure on both sides. This telescopic structure consists of a spring and a sliding sleeve 7. The sliding sleeve 7 is fitted onto the spring, with one end of the spring connected to the end of the sealing plate 5 and the other end connected to the lining concrete. The sliding sleeve 7 is fixed to the surface of the lining concrete. When the sliding sleeve 7 has a bottom wall away from the sealing plate 5, the other end of the spring can also be connected to that bottom wall. Under high internal pressure, the lining concrete structure expands and deforms, the structural joint 4 opens, and the concrete lining block 2 drives the spring in the telescopic structure to deform. The sealing plate 5 can always completely cover the opened structural joint 4, ensuring the airtightness of the gas storage tank.

[0057] During the continuous filling and discharging of the gas storage tank, the structural joint 4 opens and closes accordingly. Through the expansion and contraction structure of the sealing plate 5 and the concrete lining block 2 connecting the surface of the structural joint 4, it can adapt to repeated deformation during the loading and unloading process. The sealing plate 5 always plays a protective role on the surface of the structural joint 4, and together with the concrete lining block 2, it provides a flat base layer for the sealing layer 3.

[0058] In this embodiment of the invention, a sealing plate 5 is fixed to the surface of the structural joint 4 via a telescopic structure. The telescopic structure consists of a spring and a sliding sleeve 7. The sliding sleeve 7 is fitted onto the spring and fixed to the surface of the lining concrete. The spring connects the sealing plate 5 and the concrete lining block 2. Under repeated internal pressure, the structural joint 4 opens and closes, and the telescopic structure deforms accordingly. However, the position of the sealing plate 5 on the surface of the structural joint 4 remains unchanged, completely covering the opened structural joint 4. At the same time, together with the concrete lining block 2, it provides a flat base layer for the sealing layer 3, ensuring the airtightness of the gas storage tank.

[0059] In another specific embodiment of the present invention, the end of the sealing plate 5 near the telescopic structure has a first serrated portion;

[0060] The telescopic structure includes:

[0061] The connecting plate 9 has a second serrated portion at its end near the closing plate 5, and the first serrated portion and the second serrated portion are meshed together; in practical applications, the connecting plate 9 can be a steel plate.

[0062] The first fastener 10 is used to fix the end of the connecting plate 9 away from the closing plate 5 to the concrete lining block 2 on the corresponding side. In practical applications, the first fastener 10 can be a bolt, rivet, etc.

[0063] Furthermore, the enclosed component also includes:

[0064] A connecting structure is provided at the end of the closed plate 5 away from the telescopic structure, for connecting the end of the closed plate 5 to the concrete lining block 2 on the corresponding side.

[0065] Specifically, the connection structure includes:

[0066] The second fastener 11 is used to fix the end of the closing plate 5 away from the connecting plate 9 to the concrete lining block 2 on the corresponding side. In practical applications, the second fastener 11 can be a bolt, rivet, etc.

[0067] refer to Figures 3 to 5 As shown, the surface of the structural joint 4 is covered by two interlocking steel plates (i.e., the sealing plate 5 and the connecting plate 9). The upper surface of the steel plates is flush with the surface of the concrete lining block 2, providing a flat base layer for the sealing layer 3.

[0068] Two interlocking steel plates are fixed to the concrete lining blocks 2 on both sides of the structural joint 4 by fasteners (such as bolts and rivets). The sealing plate 5 completely covers the structural joint 4 and extends a certain length. Under high internal pressure, the lining concrete structure expands and deforms, the structural joint 4 opens, and the concrete lining blocks 2 drive the interlocking sealing plate 5 and connecting plate 9 to open. However, the sealing plate 5 can always completely cover the opened structural joint 4, ensuring the airtightness of the gas storage tank.

[0069] In practical applications, underground gas storage facilities also include:

[0070] The shielding element 12 is disposed between the sealing layer 3 and the sealing component and covers the sealing component.

[0071] Specifically, the shielding component 12 can be geotextile or geomembrane.

[0072] A layer of geotextile or geomembrane is placed between the concrete lining block 2 and the sealing component at the structural joint 4 to prevent the sealing layer 3 from entering the middle gap after the sealing component expands.

[0073] In this embodiment of the invention, two interlocking sealing plates 5 and connecting plates 9 are fixed on both sides of the surface of the structural seam 4. The sealing plates 5 completely cover the structural seam 4 and extend a certain length. When the structural seam 4 opens under internal pressure, the sealing plates 5 can completely cover the opened structural seam 4, ensuring the airtightness of the gas storage tank.

[0074] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. An underground gas storage facility based on a segmented lining structure, characterized in that, The underground gas storage facility includes: Surrounding rock of the cavern; A lining layer is provided on the inner side of the cave wall of the surrounding rock of the cavern, and the lining layer is composed of multiple concrete lining blocks. A sealing layer is provided on the inner side of the lining layer; A sealing component is disposed at one end of the lining layer near the sealing layer, and is used to seal the joint opening of the structural joint between two adjacent concrete lining blocks; the sealing component is extendable in length along the opening direction of the structural joint. The lining layer has multiple receiving grooves at one end near the sealing layer; the number of receiving grooves is equal to the number of structural joints, and their positions correspond to each other; The receiving groove is used to receive the sealing component so that the surface of the sealing component near the sealing layer is flush with the inner surface of the lining layer; The enclosed component includes: A sealing plate is installed at the opening of the structural joint to seal the opening of the structural joint. A telescopic structure is used to telescopically connect the end of the closed plate to the concrete lining block on the corresponding side; The underground gas storage facility also includes: A shielding element is disposed between the sealing layer and the closure assembly, and covers the closure assembly.

2. The underground gas storage facility according to claim 1, characterized in that, There are two telescopic structures, which are respectively located at both ends of the closed plate along the opening direction of the structural seam.

3. The underground gas storage facility according to claim 1 or 2, characterized in that, The telescopic structure includes: The elastic element has one end connected to the end of the closed plate and the other end connected to the concrete lining block on the corresponding side. The sleeve is fitted onto the elastic member and connected to the concrete lining block on the corresponding side.

4. The underground gas storage facility according to claim 1, characterized in that, The end of the sealing plate near the telescopic structure has a first serrated portion; The telescopic structure includes: The connecting plate has a second serrated portion at its end near the closing plate, and the first serrated portion and the second serrated portion are meshed together. The first fastener is used to fix the end of the connecting plate away from the closing plate to the concrete lining block on the corresponding side.

5. The underground gas storage facility according to claim 4, characterized in that, The enclosure component also includes: A connecting structure is provided at the end of the closed plate away from the telescopic structure, for connecting the end of the closed plate to the concrete lining block on the corresponding side.

6. The underground gas storage facility according to claim 5, characterized in that, The connection structure includes: The second fastener is used to fix the end of the sealing plate away from the connecting plate to the concrete lining block on the corresponding side.

7. The underground gas storage facility according to claim 1, characterized in that, The shielding component is geotextile or geomembrane.

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