Device and method for testing air tightness of sealing material of underground high-pressure gas storage

Abstract

The invention discloses an underground high-pressure gas storage sealing material airtightness testing device and method, and relates to the technical field of underground gas storage, and the device comprises a rigid constraint cylinder which is provided with a first flange cover at an upper opening in a sealing manner and a second flange cover at a lower opening, and a concrete sealing tank which is concentrically arranged in the rigid constraint cylinder, a gas cavity is defined in the concrete sealing tank, a mounting cavity is defined between the concrete sealing tank and the rigid constraint cylinder, the air pressure adjusting device is used for adjusting the air pressure of the gas cavity, the high-pressure water bag is arranged in the mounting cavity, the water pressure adjusting device is used for adjusting the water pressure of the high-pressure water bag, and the sealing material layer is arranged on the side wall of the gas cavity. The stress environment of the high-pressure gas storage and the deformation condition of the concrete sealing tank are simulated by controlling the internal air pressure and the external water pressure of the concrete sealing tank, then the sealing performance of the sealing material layer is tested, the testing condition is close to the real environment, and the testing result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of underground gas storage, and particularly to an airtightness test device and method for a sealing material of an underground high-pressure gas storage reservoir. Background Art

[0002] In an underground gas storage reservoir, the sealing layer plays a crucial role and the airtightness of the underground gas storage reservoir needs to be ensured. Most existing underground gas storage reservoirs use steel plates as the sealing layer. However, the steel plate sealing layer is too costly and difficult to install. Currently, the main research direction of underground gas storage reservoirs at home and abroad is to replace the steel plate sealing layer with a reinforced concrete gas storage tank combined with a sealing material. The sealing materials mainly include: organic polymers, high molecular rubbers, fiberglass reinforced plastics, etc. The airtightness is verified by designing a gas permeation device (Airtightness of a flexible sealed compressed air storage energy (CAES) tunnel considering the permeation accumulation of high-pressure air). This kind of device test cannot simulate the complex environmental conditions of a high-pressure gas storage reservoir, the stress condition of the sealing material does not conform to the actual situation, and the test results are not representative.

[0003] In view of this, how to provide a device that can simulate the environmental conditions of a high-pressure gas storage reservoir and make the airtightness test of the sealing material of the gas storage reservoir more accurate is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide an airtightness test device and method for a sealing material of an underground high-pressure gas storage reservoir to solve the problems existing in the prior art.

[0005] To achieve the above purpose, the present invention provides an airtightness test device for a sealing material of an underground high-pressure gas storage reservoir, including:

[0006] A rigid constraint cylinder, which is a cylindrical structure with openings at both the top and the bottom. A first flange cover is hermetically arranged at its upper opening, and a second flange cover is arranged at its lower opening;

[0007] A concrete sealing tank, which is concentrically arranged inside the rigid constraint cylinder. A gas cavity is defined inside the concrete sealing tank, and an installation cavity is defined between the concrete sealing tank and the rigid constraint cylinder;

[0008] An air pressure regulating device, which is communicated with the gas cavity for regulating the air pressure in the gas cavity;

[0009] A high-pressure water bag, which is arranged inside the installation cavity;

[0010] A water pressure regulating device, which is connected to the high-pressure water bag for regulating the water pressure of the high-pressure water bag;

[0011] A sealing material layer, which is arranged on the side wall of the gas cavity.

[0012] Furthermore, it further includes:

[0013] A reaction frame, which has columns and a cross beam. The second flange cover is arranged on the base. The columns are vertically arranged on the base and are located on both sides of the second flange cover. The cross beam is horizontally arranged on the top of the columns and is located above the first flange cover;

[0014] A jack, which is arranged on the cross beam, and its output end is connected to the first flange cover.

[0015] Furthermore, a plurality of reinforcing ribs are arranged on the upper surface of the first flange cover, and the output end of the jack is connected to the reinforcing ribs.

[0016] Furthermore, it further includes:

[0017] A gasket ring, which is arranged at the upper end of the high-pressure water bag and is connected to the first flange cover;

[0018] An L-shaped steel ring, which has a horizontal section and a vertical section. The horizontal section is arranged on the upper edge of the concrete sealing tank, and the vertical section extends downward to the side wall of the gas cavity;

[0019] The first flange cover extends downward to form a circular ring connection part. The bottom surface of the circular ring connection part is connected to the horizontal section, the inner side surface is flush with the vertical section, and the outer side surface is connected to the gasket ring.

[0020] Furthermore, the air pressure regulating device is a gas compressor. The first flange cover is provided with air holes penetrating through the upper and lower surfaces. One end of the air holes is connected to the gas cavity, and the other end is connected to the gas compressor; a pressure gauge is arranged on the lower surface of the first flange cover. Both the pressure gauge and the gas compressor are electrically connected to the computer control center. The pressure gauge is used to detect the air pressure of the gas cavity and feedback it to the computer control center, and the computer control center controls the air pressure of the gas cavity through the gas compressor.

[0021] Furthermore, the water pressure regulating device is a high-pressure water pump. The rigid constraint cylinder is provided with water holes penetrating through the inner and outer surfaces. The water inlet pipe of the high-pressure water bag is connected to the high-pressure water pump through the water holes. A water pressure gauge is arranged in the high-pressure water bag. Both the water pressure gauge and the high-pressure water pump are electrically connected to the computer control center. The water pressure gauge is used to detect the water pressure of the high-pressure water bag and feedback it to the computer control center, and the computer control center controls the water pressure of the high-pressure water bag through the high-pressure water pump.

[0022] Furthermore, it further includes:

[0023] The centering ring is arranged at the lower end of the high-pressure water bag and is connected to the second flange cover. The centering ring is concentrically arranged with the concrete sealing tank, and the inner and outer surfaces of the centering ring are respectively connected to the concrete sealing tank and the rigid restraint cylinder.

[0024] Furthermore, it further includes:

[0025] A gasket. An installation groove is circumferentially formed on the lower surface of the circular ring connecting portion. The gasket is arranged in the installation groove and is connected to the upper surface of the L-shaped steel ring.

[0026] Furthermore, the upper opening and the lower opening of the rigid restraint cylinder extend outward to form an upper connecting plate and a lower connecting plate. The upper connecting plate is connected to the first flange cover by bolts, and the lower connecting plate is connected to the second flange cover by bolts.

[0027] The present invention also provides a method for testing the airtightness of the sealing material of an underground high-pressure gas storage reservoir. Using the underground high-pressure gas storage reservoir sealing material airtightness testing device, it includes the following steps:

[0028] S1: Install the horizontal section of the L-shaped steel ring on the upper edge of the concrete sealing tank, and the vertical section closely adheres to the side wall of the gas cavity. Spray the sealing material on the side wall of the gas cavity to form a sealing material layer;

[0029] S2: Install the reaction frame and the second flange cover on the base;

[0030] S3: Install the concrete sealing tank and the rigid restraint cylinder on the second flange cover in sequence. Install the centering ring between the concrete sealing tank and the rigid restraint cylinder. The centering ring, the concrete sealing tank, and the rigid restraint cylinder are concentrically arranged. The inner and outer surfaces of the centering ring are respectively connected to the concrete sealing tank and the rigid restraint cylinder. Connect the rigid restraint cylinder to the second flange cover by bolts;

[0031] S4: Arrange the high-pressure water bag in the installation cavity. Lead its water inlet pipe out from the water hole and connect it to a high-pressure water pump. Inject water with a preset pressure into the high-pressure water bag through the high-pressure water pump, and arrange a cushion ring at the top of the high-pressure water bag;

[0032] S5: Install the gasket in the installation groove circumferentially formed on the lower surface of the cushion ring. The gasket is connected to the upper surface of the L-shaped steel ring. Connect the rigid restraint cylinder to the first flange cover by bolts;

[0033] S6: The computer control center adjusts the air pressure in the gas cavity to the target air pressure through the gas compressor, and adjusts the water pressure in the high-pressure water bag to the target water pressure through the high-pressure water pump. The inner side of the concrete sealing tank bears the target air pressure, and the outside bears the target water pressure, forming a stress environment for the high-pressure gas storage reservoir.

[0034] The present invention discloses the following technical effects:

[0035] 1. By controlling the internal air pressure and external water pressure of the concrete sealed tank to simulate the stress environment of a high-pressure gas storage reservoir and the deformation of the concrete sealed tank, the sealing performance test of the sealing material layer can be realized. The test conditions are close to the real environment, and the test results are more accurate. The internal air pressure and external water pressure are dynamically and precisely adjusted by the computer control center, which has good application prospects and a wide range of applicability.

[0036] 2. An L-shaped steel ring and a sealing gasket are arranged between the concrete sealed tank and the first flange cover to ensure the sealing performance of the concrete sealed tank and prevent air leakage between the concrete sealed tank and the first flange cover during the test.

[0037] 3. Reinforcing ribs are arranged on the top of the first flange cover, which can cooperate with the reaction frame and the jack to prevent the first flange cover from bulging in a high-pressure air environment and ensure the sealing performance of the concrete sealed tank.

[0038] 4. A centering ring is concentrically arranged between the concrete sealed tank and the rigid restraint cylinder to ensure that the three are concentrically arranged, so that the internal air pressure and external water pressure of the concrete sealed tank are evenly distributed, and the stress conditions are closer to the real environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the first flange cover;

[0042] Figure 3 It is a schematic diagram of the structure of the rigid restraint cylinder;

[0043] Figure 4 It is a diagram of the stress state of the concrete sealed tank;

[0044] Among them, 1. Rigid restraint cylinder; 2. First flange cover; 3. Second flange cover; 4. Concrete sealed tank; 5. High-pressure water bag; 6. Reaction frame; 7. Base; 8. Jack; 9. Reinforcing rib; 10. Pad ring; 11. L-shaped steel ring; 12. Air hole; 13. Pressure gauge mounting hole; 14. Water hole; 15. Centering ring; 16. Sealing gasket; 17. Ring connection part; 18. Installation groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] An airtightness test device for an underground high-pressure gas storage seal material provided by an embodiment of the present invention includes:

[0048] A rigid constraint cylinder 1, which is a cylindrical structure with openings at both the upper and lower ends. A first flange cover 2 is hermetically arranged at its upper opening, and a second flange cover 3 is arranged at its lower opening.

[0049] A concrete seal tank 4 is concentrically arranged inside the rigid constraint cylinder 1. A gas cavity is defined inside the concrete seal tank 4, and an installation cavity is defined between the concrete seal tank 4 and the rigid constraint cylinder 1.

[0050] An air pressure regulating device, which is communicated with the gas cavity for regulating the air pressure in the gas cavity to generate internal air pressure on the concrete seal tank 4.

[0051] A high-pressure water bag 5 is arranged in the installation cavity. The high-pressure water bag 5 and the rigid constraint cylinder 1 cooperate to generate external water pressure on the concrete seal tank 4.

[0052] A water pressure regulating device, which is communicated with the high-pressure water bag 5 for regulating the water pressure of the high-pressure water bag 5.

[0053] A seal material layer is arranged on the side wall of the gas cavity.

[0054] In this embodiment, it further includes:

[0055] A reaction frame 6, which has columns and crossbeams. The second flange cover 3 is arranged on a base 7. The columns are vertically arranged on the base 7 and are located on both sides of the second flange cover 3. The crossbeam is horizontally arranged on the top of the columns and is located above the first flange cover 2.

[0056] A jack 8 is arranged on the crossbeam, and its output end is connected to the first flange cover 2.

[0057] In this embodiment, a plurality of reinforcing ribs 9 are arranged on the upper surface of the first flange cover 2, and the output end of the jack 8 is connected to the reinforcing ribs 9. The reaction frame 6 and the jack 8 can provide longitudinal constraints at the top of the first flange cover 2 to prevent the first flange cover 2 from bulging under the action of high-pressure gas.

[0058] In this embodiment, it further includes:

[0059] A gasket ring 10, which is arranged at the upper end of the high-pressure water bag 5 and is connected to the first flange cover 2;

[0060] An L-shaped steel ring 11, which has a horizontal section and a vertical section. The horizontal section is arranged at the upper edge of the concrete sealing tank 4, and the vertical section extends downward to the side wall of the gas cavity;

[0061] The first flange cover 2 extends downward to form a circular ring connection part 17. The bottom surface of the circular ring connection part 17 is connected to the horizontal section, the inner side surface is flush with the vertical section, and the outer side surface is connected to the gasket ring 10.

[0062] In this embodiment, the air pressure regulating device is an air compressor. The first flange cover 2 is provided with air holes 12 penetrating through the upper and lower surfaces. One end of the air holes 12 is communicated with the gas cavity, and the other end is communicated with the air compressor; an air pressure gauge installation hole 13 is opened on the lower surface of the first flange cover 2, and the air pressure gauge is arranged in the air pressure gauge installation hole 13. Both the air pressure gauge and the air compressor are electrically connected to the computer control center. The air pressure gauge is used to detect the air pressure in the gas cavity and feedback it to the computer control center, and the computer control center controls the air pressure in the gas cavity through the air compressor.

[0063] In this embodiment, the water pressure regulating device is a high-pressure water pump. The rigid constraint cylinder 1 is provided with water holes 14 penetrating through the inner and outer surfaces. The water inlet pipe of the high-pressure water bag 5 is communicated with the high-pressure water pump through the water holes 14. A water pressure gauge is arranged in the high-pressure water bag 5. Both the water pressure gauge and the high-pressure water pump are electrically connected to the computer control center. The water pressure gauge is used to detect the water pressure in the high-pressure water bag 5 and feedback it to the computer control center, and the computer control center controls the water pressure in the high-pressure water bag 5 through the high-pressure water pump.

[0064] In this embodiment, it further includes:

[0065] A centering ring 15, which is arranged at the lower end of the high-pressure water bag 5 and is connected to the second flange cover 3. The centering ring 15 is concentrically arranged with the concrete sealing tank 4, and the inner and outer surfaces of the centering ring 15 are respectively connected to the concrete sealing tank 4 and the rigid constraint cylinder 1.

[0066] In this embodiment, it further includes:

[0067] A sealing gasket 16. An installation groove 18 is opened along the circumference on the lower surface of the circular ring connection part 17. The sealing gasket 16 is arranged in the installation groove 18 and is connected to the upper surface of the L-shaped steel ring 11. The L-shaped steel ring 11 and the sealing gasket 16 are arranged between the concrete sealing tank 4 and the first flange cover 2 to ensure the sealing performance of the concrete sealing tank 4 and prevent air leakage between the concrete sealing tank 4 and the first flange cover 2 during the test.

[0068] In this embodiment, the upper opening and the lower opening of the rigid constraint cylinder 1 extend outwards to form an upper connecting plate and a lower connecting plate. The upper connecting plate is connected to the first flange cover 2 by bolts, and the lower connecting plate is connected to the second flange cover 3 by bolts.

[0069] The present invention also provides a method for testing the airtightness of the sealing material of an underground high-pressure gas storage reservoir, which applies an underground high-pressure gas storage reservoir sealing material airtightness testing device and includes the following steps:

[0070] S1: Install the horizontal section of the L-shaped steel ring 11 on the upper edge of the concrete sealing tank 4, and make the vertical section closely adhere to the side wall of the gas cavity. Spray the sealing material on the side wall of the gas cavity to form a sealing material layer.

[0071] S2: Install the reaction frame 6 and the second flange cover 3 on the base 7.

[0072] S3: Install the concrete sealing tank 4 and the rigid constraint cylinder 1 on the second flange cover 3 in sequence. Install the centering ring 15 between the concrete sealing tank 4 and the rigid constraint cylinder 1. The centering ring 15, the concrete sealing tank 4 and the rigid constraint cylinder 1 are concentrically arranged. The inner and outer surfaces of the centering ring 15 are respectively connected to the concrete sealing tank 4 and the rigid constraint cylinder 1, and connect the rigid constraint cylinder 1 to the second flange cover 3 by bolts.

[0073] S4: Arrange the high-pressure water bag 5 in the installation cavity, lead its water inlet pipe out from the water hole 14 and connect it to a high-pressure water pump. Inject water with a preset pressure into the high-pressure water bag 5 through the high-pressure water pump, and arrange a cushion ring 10 at the top of the high-pressure water bag 5.

[0074] S5: Install the sealing gasket 16 in the installation groove 18 opened along the circumferential direction on the lower surface of the cushion ring 10. The sealing gasket 16 is connected to the upper surface of the L-shaped steel ring 11, and connect the rigid constraint cylinder 1 to the first flange cover 2 by bolts.

[0075] S6: The computer control center adjusts the air pressure in the gas cavity to the target air pressure through a gas compressor, and adjusts the water pressure in the high-pressure water bag 5 to the target water pressure through a high-pressure water pump. The inside of the concrete sealing tank 4 bears the target air pressure, and the outside bears the target water pressure, forming a stress environment of an underground high-pressure gas storage reservoir. The computer control center can intelligently and dynamically adjust the target air pressure and the target water pressure through theoretical calculation or numerical simulation according to the required simulation working conditions, and then control the deformation of the concrete sealing tank 4 to test the sealing performance of the sealing material layer.

[0076] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0077] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir, characterized in that, Comprising: A rigid constraint cylinder (1), which is a cylinder structure with openings at both the top and bottom. Its upper opening is hermetically provided with a first flange cover (2), and its lower opening is provided with a second flange cover (3); A concrete sealing tank (4), which is concentrically arranged inside the rigid constraint cylinder (1). A gas cavity is defined inside the concrete sealing tank (4), and an installation cavity is defined between the concrete sealing tank (4) and the rigid constraint cylinder (1); A pneumatic pressure regulating device, which is communicated with the gas cavity for regulating the air pressure in the gas cavity; A high-pressure water bag (5), which is arranged inside the installation cavity; A water pressure regulating device, which is communicated with the high-pressure water bag (5) for regulating the water pressure in the high-pressure water bag (5); A sealing material layer, which is arranged on the side wall of the gas cavity.

2. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 1, characterized in that, Further comprising: A reaction frame (6), which has columns and a cross beam. The second flange cover (3) is arranged on a base (7). The columns are vertically arranged on the base (7) and are located on both sides of the second flange cover (3). The cross beam is horizontally arranged on the top of the columns and is located above the first flange cover (2); A jack (8), which is arranged on the cross beam, and its output end is connected to the first flange cover (2).

3. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 2, characterized in that, A plurality of reinforcing ribs (9) are arranged on the upper surface of the first flange cover (2), and the output end of the jack (8) is connected to the reinforcing ribs (9).

4. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 3, characterized in that, Further comprising: A gasket ring (10), which is arranged at the upper end of the high-pressure water bag (5) and is connected to the first flange cover (2); An L-shaped steel ring (11), which has a horizontal section and a vertical section. The horizontal section is arranged on the upper edge of the concrete sealing tank (4), and the vertical section extends downward to the side wall of the gas cavity; The first flange cover (2) extends downward to form a circular ring connecting portion (17). The bottom surface of the circular ring connecting portion (17) is connected to the horizontal section, the inner side surface is flush with the vertical section, and the outer side surface is connected to the gasket ring (10).

5. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 4, characterized in that, The pneumatic pressure regulating device is a gas compressor. The first flange cover (2) is provided with air holes (12) penetrating through the upper and lower surfaces. One end of the air holes (12) is communicated with the gas cavity, and the other end is communicated with the gas compressor. A pressure gauge is arranged on the lower surface of the first flange cover (2). Both the pressure gauge and the gas compressor are electrically connected to a computer control center. The pressure gauge is used to detect the air pressure in the gas cavity and feedback it to the computer control center. The computer control center controls the air pressure in the gas cavity through the gas compressor.

6. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 5, characterized in that, The water pressure regulating device is a high-pressure water pump. The rigid constraint cylinder (1) is provided with water holes (14) penetrating through the inner and outer surfaces. The water inlet pipe of the high-pressure water bag (5) is communicated with the high-pressure water pump through the water holes (14). A water pressure gauge is arranged inside the high-pressure water bag (5). Both the water pressure gauge and the high-pressure water pump are electrically connected to the computer control center. The water pressure gauge is used to detect the water pressure in the high-pressure water bag (5) and feedback it to the computer control center. The computer control center controls the water pressure in the high-pressure water bag (5) through the high-pressure water pump.

7. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 6, characterized in that, Further comprising: The centering ring (15) is arranged at the lower end of the high-pressure water bag (5) and is connected to the second flange cover (3). The centering ring (15) is concentrically arranged with the concrete sealing tank (4), and the inner and outer surfaces of the centering ring (15) are respectively connected to the concrete sealing tank (4) and the rigid restraint cylinder (1).

8. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 6, characterized in that, It further includes: The gasket (16), an installation groove (18) is circumferentially formed on the lower surface of the circular ring connecting portion (17), and the gasket (16) is arranged in the installation groove (18) and is connected to the upper surface of the L-shaped steel ring (11).

9. The airtightness testing device for the sealing material of an underground high-pressure gas storage reservoir according to claim 6, characterized in that, The upper opening and the lower opening of the rigid restraint cylinder (1) extend outwards to form an upper connecting plate and a lower connecting plate. The upper connecting plate is connected to the first flange cover (2) by bolts, and the lower connecting plate is connected to the second flange cover (3) by bolts.

10. An airtightness testing method for the sealing material of an underground high-pressure gas storage reservoir, characterized in that, Applying the underground high-pressure gas storage seal material airtightness test device according to any one of claims 6-9, including the following steps: S1: Install the horizontal section of the L-shaped steel ring (11) on the upper edge of the concrete sealing tank (4), and the vertical section is closely attached to the side wall of the gas cavity. Spray the sealing material on the side wall of the gas cavity to form a sealing material layer; S2: Install the reaction frame (6) and the second flange cover (3) on the base (7); S3: Install the concrete sealing tank (4) and the rigid restraint cylinder (1) on the second flange cover (3) in sequence. Install the centering ring (15) between the concrete sealing tank (4) and the rigid restraint cylinder (1). The centering ring (15), the concrete sealing tank (4) and the rigid restraint cylinder (1) are concentrically arranged. The inner and outer surfaces of the centering ring (15) are respectively connected to the concrete sealing tank (4) and the rigid restraint cylinder (1). Connect the rigid restraint cylinder (1) to the second flange cover (3) by bolts; S4: Arrange the high-pressure water bag (5) in the installation cavity, lead its water inlet pipe out from the water hole (14) and connect it to the high-pressure water pump. Inject water with a preset pressure into the high-pressure water bag (5) through the high-pressure water pump, and arrange a cushion ring (10) at the top of the high-pressure water bag (5); S5: Install the gasket (16) in the installation groove (18) circumferentially formed on the lower surface of the cushion ring (10). The gasket (16) is connected to the upper surface of the L-shaped steel ring (11). Connect the rigid restraint cylinder (1) to the first flange cover (2) by bolts; S6: The computer control center adjusts the air pressure in the gas cavity to the target air pressure through the gas compressor, and adjusts the water pressure of the high-pressure water bag (5) to the target water pressure through the high-pressure water pump. The inner side of the concrete sealing tank (4) bears the target air pressure, and the outside bears the target water pressure to form a high-pressure gas storage stress environment.

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