Steel plate sealing structure for compressed air underground storage suitable for soft rock

Abstract

The application discloses a steel plate sealing structure of compressed air underground gas storage suitable for soft rock, which comprises a steel plate in the shape of rectangle after unfolding and a telescopic device, two wide edges of the steel plate are overlapped together to form a cylindrical cavity, the wide edge overlapped with the inner wall of the cavity is defined as the first overlapping edge, the wide edge overlapped with the outer wall of the cavity is defined as the second overlapping edge, one end of the telescopic device is fixedly connected with the first overlapping edge, and the other end is fixedly connected with the inner wall of the cavity or the second overlapping edge. The steel plate sealing is arranged on the lining concrete inner wall of the gas storage, and corrugated steel plates are arranged at the overlapping positions, so that when the gas storage arranged in soft surrounding rock is inflated and subjected to high pressure of internal gas, the telescopic deformation of the corrugated steel plates can adapt to the large deformation of the external soft rock under the action of high internal pressure, the stress of the steel plate is reduced, the strength damage of the sealing steel plate is prevented, and the air tightness and safe operation of the gas storage are ensured. The application has the advantages of simple structure, safety and stability, economy, practicality and easy implementation.

Description

TECHNICAL FIELD

[0001] The application discloses a steel plate sealing structure suitable for compressed air underground gas storage of soft rock and belongs to the technical field of energy storage. BACKGROUND

[0002] The underground gas storage is widely used due to the advantages of flexible site selection, large storage capacity, durable use and economic rationality. The underground gas storage uses the force of underground rock mass to resist the pressure of compressed air in the gas storage. The core task of construction of the compressed air underground gas storage is to guarantee the sealing property and the safety of the cavity structure of the gas storage. The steel plate is often used as the sealing layer material. The whole cast concrete is used for lining the outside of the sealing layer as the force transmission structure layer of the sealing layer.

[0003] When the surrounding rock of the underground gas storage is hard rock, the rock mass has high strength, and the deformation of the gas storage after filling high-pressure gas is small. Only the self ductility of the steel plate can adapt to the alternating load in the compressed air storage process. However, when the surrounding rock of the underground gas storage is soft rock, the rock mass has low strength, and the pressure of the gas storage after filling high-pressure gas is as high as 10 MPa or above. After being pressed, the surrounding rock will have large deformation, the sealing steel plate will have large deformation, and the strength of the steel plate will be over limited and be broken in severe cases, and then the gas leakage accident of the gas storage will occur. SUMMARY

[0004] The application aims to provide a steel plate sealing structure suitable for compressed air underground gas storage of soft rock to solve the technical problem that when the surrounding rock of the underground gas storage is soft rock, the rock mass has low strength, the large deformation of the soft surrounding rock after filling high-pressure gas causes large deformation of the steel plate, the self ductility of the sealing steel plate cannot meet the large deformation after filling gas, the sealing steel plate is broken in severe cases, and the gas leakage accident occurs. To achieve the above-mentioned purpose, the application provides a steel plate sealing structure suitable for compressed air underground gas storage of soft rock, and the specific scheme is as follows.

[0005] The steel plate sealing structure suitable for compressed air underground gas storage of soft rock comprises one sealing steel plate which is rectangular after unfolding and an expansion device.

[0006] The two wide edges of the sealing steel plate are overlapped to form a cylindrical cavity.

[0007] The wide edge which is overlapped with the inner wall of the cavity is defined as the first overlapped edge, and the wide edge which is overlapped with the outer wall of the cavity is defined as the second overlapped edge.

[0008] One end of the expansion device is fixedly connected with the first overlapped edge, and the other end is fixedly connected with the inner wall of the cavity or the second overlapped edge.

[0009] Preferably, the expansion device comprises a corrugated steel plate.

[0010] The long side length of the corrugated steel plate is equal to the width length of the sealing steel plate;

[0011] The crest or trough of the corrugated steel plate is parallel to the width of the sealing steel plate;

[0012] One long side of the corrugated steel plate is fixedly connected with the first lap joint edge, and the other long side is fixedly connected with the inner wall of the cavity or the second lap joint edge.

[0013] Preferably, the cross section of the cavity is circular or elliptical.

[0014] Preferably, the isolation device is further included, and the length of the isolation device is equal to the length of the second lap joint edge.

[0015] The isolation device is arranged between the second lap joint edge and the outer wall of the cavity and extends along the extension direction of the second lap joint edge.

[0016] Preferably, the isolation device is a rubber pad or a sealing strip.

[0017] Preferably, the thickness of the rubber pad or the sealing strip is 5-10 mm.

[0018] Preferably, the lap joint length is greater than 30 cm.

[0019] Preferably, the outer surface of the steel plate is provided with a plurality of gripping ribs.

[0020] Preferably, the material of the gripping rib is steel bar;

[0021] The shape of the gripping rib is a "j" shape.

[0022] Beneficial effects:

[0023] The present application sets the sealing steel plate in the lining concrete inner wall of the gas storage, sets the corrugated steel plate at the lap joint, so that the gas storage set in the soft surrounding rock can adapt to the large deformation of the external soft rock under the action of high internal pressure through the expansion and contraction deformation of the corrugated steel plate when the gas storage is inflated under the high pressure of the internal gas, reduces the stress of the sealing steel plate, prevents the strength damage of the sealing steel plate of the gas storage, and ensures the air tightness and safe operation of the gas storage. The present application has the advantages of simple structure, safety and stability, economy and practicality, and easy implementation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a cross section schematic view of the underground gas storage in the embodiment.

[0025] In the figure: 1, soft surrounding rock; 2, concrete lining; 3, gripping rib; 4, sealing steel plate; 5, rubber pad; 6, corrugated steel plate; 7, high pressure gas. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0027] like Figure 1 As shown, in one embodiment, a steel plate sealing structure for an underground compressed air storage facility suitable for soft rock is disclosed, comprising a rectangular sealing steel plate 4 and a telescopic device; the sealing steel plate 4 is disposed in the soft surrounding rock 1, and concrete is poured between the sealing steel plate 4 and the soft surrounding rock 1. The two wide sides of the sealing steel plate 4 overlap to form a cylindrical cavity; the cross-section of the cavity is circular or elliptical. The upper and lower end faces of the cavity are sealed with a flexible airtight material, and the wide side overlapping with the inner wall of the cavity is designated as the first overlapping side, and the wide side overlapping with the outer wall of the cavity is designated as the second overlapping side; one end of the telescopic device is fixedly connected to the first overlapping side, and the other end is fixedly connected to the inner wall of the cavity.

[0028] Specifically, the telescopic device is made of a material with telescopic properties. In this embodiment, corrugated steel plate 6 is selected as the telescopic device. Corrugated steel plate 6 is easy to fix and connect with the sealing steel plate used in the gas storage tank of this invention, and the material is stable. The long side of corrugated steel plate 6 is equal to the wide side of sealing steel plate 4, and the crests or troughs of corrugated steel plate 6 are parallel to the wide side of sealing steel plate 4. One long side of corrugated steel plate 6 is fixedly connected to the first overlapping side, and the other long side of corrugated steel plate 6 is fixedly connected to the inner wall of the cavity. Corrugated steel plate 6 is in close contact with the inner wall of the cavity, so that the extended position of corrugated steel plate 6 in its natural state is fixedly connected to the inner wall of the cavity. The above-mentioned fixed connection adopts an airtight connection method, such as full-seam welding or seamless welding. In this embodiment, full welding connection is adopted to ensure the airtightness of the gas storage tank, form a sealing layer of the gas storage tank, and ensure the safe operation of the gas storage tank.

[0029] The sealing structure of the present invention also includes an isolation device. The length of the isolation device is equal to that of the second overlapping edge. The isolation device is disposed between the second overlapping edge and the outer wall of the cavity and extends along the extending direction of the second overlapping edge. The isolation device is a rubber pad 5 or a sealing strip. The thickness of the rubber pad 5 or the sealing strip is 5-10 mm, and the overlap length of the sealing steel plate 4 is greater than 30 cm. After the sealing structure of the gas storage steel plate is completed, a concrete lining 2 is installed. The isolation device is used to prevent concrete slurry from entering the overlapping area of ​​the sealing steel plate 4 during concrete pouring, and to prevent the concrete slurry from adhering to the overlap seam of the sealing steel plate 4 and the corrugated steel plate 6 after solidification, thus affecting the free expansion and contraction of the corrugated steel plate 6 when the gas storage is filled with high-pressure gas 7. Specifically, in this embodiment, a rubber pad 5 is used as the isolation device.

[0030] The outer surface of the sealing steel plate 4 is provided with a plurality of gripping ribs 3. The gripping ribs 3 are made of steel; the shape of the gripping ribs 3 is a "j" shape. The gripping ribs 3 are uniformly arranged on the outer surface of the sealing steel plate 4, which can effectively ensure that the sealing steel plate 4 is tightly combined with the concrete lining 2.

[0031] In another embodiment, the difference from the above embodiment is that:

[0032] In the present embodiment, the corrugated steel plate 6 is arranged at the overlapping part of the sealing steel plate 4, one end of the corrugated steel plate 6 is fixedly connected with the first overlapping edge, the other end is fixedly connected with the second overlapping edge, and the corrugated steel plate 6 is clamped in the overlapping joint. When the gas storage is inflated, the sealing steel plate 4 is expanded under pressure, the corrugated steel plate 6 is shortened, and the overlapping length of the sealing steel plate 4 is shortened to adapt to the large deformation of the soft rock under the action of internal pressure. Prevent the sealing steel plate 4 from breaking or the connecting point from coming off.

[0033] The present application sets the sealing steel plate in the lining concrete inner wall of the gas storage, and sets the corrugated steel plate at the overlapping part, so that the gas storage set in the soft surrounding rock can adapt to the large deformation of the external soft rock under the action of high internal pressure through the expansion and contraction deformation of the corrugated steel plate when inflated under the high pressure of the internal gas, reduce the stress of the sealing steel plate, prevent the strength damage of the sealing steel plate of the gas storage, and ensure the airtightness and safe operation of the gas storage. The present application has the advantages of simple structure, safety and stability, economy and practicality, and easy implementation.

[0034] The above embodiments only express one embodiment of the present application, and the description is more specific and detailed, but it cannot be understood as the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A steel plate seal structure for a compressed air underground gas storage adapted for soft rock, characterized in that, It includes a sealed steel plate that is rectangular after unfolding and a telescopic device; The two wide sides of the sealed steel plate overlap with each other to form a cylindrical cavity; The wide side that overlaps with the inner wall of the cavity is denoted as the first overlapping side, and the wide side that overlaps with the outer wall of the cavity is denoted as the second overlapping side; One end of the telescopic device is fixedly connected to the first overlapping side, and the other end is fixedly connected to the inner wall of the cavity or the second overlapping side; The telescopic device includes a corrugated steel plate; The length of the long side of the corrugated steel plate is equal to the length of the wide side of the sealed steel plate; The wave crest or wave trough of the corrugated steel plate is parallel to the wide side of the sealed steel plate; One long side of the corrugated steel plate is fixedly connected to the first overlapping side, and the other long side is fixedly connected to the inner wall of the cavity or the second overlapping side; It further includes an isolation device, and the length of the isolation device is equal to that of the second overlapping side; The isolation device is arranged between the second overlapping side and the outer wall of the cavity and extends along the extending direction of the second overlapping side.

2. The steel plate seal structure for a compressed air underground gas storage adapted for soft rock according to claim 1, characterized by, The cross-section of the cavity is circular or elliptical.

3. The steel plate seal structure for a compressed air underground gas storage adapted for soft rock according to claim 1, characterized by, The isolation device is a rubber cushion or a sealing strip.

4. The steel plate seal structure for compressed air underground gas storage adapted for soft rock according to claim 3, characterized by, The thickness of the rubber cushion or the sealing strip is 5 - 10 mm.

5. The steel plate seal structure for a compressed air underground gas storage adapted for soft rock according to claim 1, characterized by, The overlapping length is greater than 30 cm.

6. The steel plate seal structure for a compressed air underground gas storage adapted for soft rock according to claim 1, characterized by, A plurality of grab ribs are provided on the outer surface of the sealed steel plate.

7. The steel plate seal structure for a compressed air underground gas storage adapted for soft rock according to claim 6, characterized in that, The material of the grab ribs is steel bars; The shape of the grab ribs is "U".

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