A concrete lining structure adapted to a soft rock gas storage

Abstract

The application discloses a kind of concrete lining structures suitable for soft rock gas storage, it is related to gas storage technical field, including by inside sequentially arranged flexible sealing layer, inner layer concrete lining layer, sliding layer and outer layer concrete lining layer, the inside of flexible sealing layer forms gas storage, the inner layer concrete lining layer includes several inner layer concrete lining blocks, and there is structural joint between adjacent inner layer concrete lining blocks.The application can adapt to large deformation, reduce the possibility of lining concrete crack, even if cracking, can effectively reduce crack width of development, to ensure the air tightness of flexible sealing layer, improve the operation safety of gas storage.

Description

Technical Field

[0001] This invention relates to the field of gas storage technology, and in particular to a concrete lining structure adapted to soft rock gas storage. Background Technology

[0002] Compressed air energy storage technology is considered a highly promising large-scale energy storage technology due to its large storage capacity, long lifespan, high efficiency, and safety. Among its applications, the excavation of new hard rock caverns as compressed air storage facilities is a growing trend. When the surrounding rock of an underground storage facility is hard rock, the deformation under compressed air pressure is relatively small. Although the lining concrete may crack, the crack width is small, and the sealing layer of the storage facility can withstand the pressure without failure. However, when the surrounding rock of an underground storage facility is soft rock, the deformation modulus of the soft rock is small, resulting in greater deformation under compressed air pressure. This causes wider cracks to form in the lining concrete within the storage facility during large deformations. When the cracks in the base concrete are wide, the flexible sealing layer may be forced into the cracks by the compressed air pressure. When the cracks contract, they further compress the sealing layer, thus compressing it and destroying its airtightness, rendering it ineffective as a sealing layer. Summary of the Invention

[0003] The purpose of this invention is to provide a concrete lining structure adapted to soft rock gas storage facilities, which can adapt to large deformations, effectively reduce the crack propagation width, ensure the airtightness of the flexible sealing layer, and improve the operational safety of the gas storage facility.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] The present invention provides a concrete lining structure adapted to soft rock gas storage, comprising a flexible sealing layer, an inner concrete lining layer, a sliding layer and an outer concrete lining layer arranged sequentially from the inside to the outside. The inner side of the flexible sealing layer forms a gas storage cell. The inner concrete lining layer includes a plurality of inner concrete lining blocks, and there are structural joints between adjacent inner concrete lining blocks.

[0006] Preferably, the sliding layer comprises an asphalt layer, an tar paper layer, and an asphalt mastic layer arranged sequentially from the inside out.

[0007] Preferably, the thickness of the sliding layer is 0.5 to 1.0 cm.

[0008] Preferably, a tension structure is provided on the inner side of the structural joint, and the two sides of the tension structure are respectively connected to the inner concrete lining blocks on both sides of the structural joint.

[0009] Preferably, the tension structure is fiberglass cloth or geotextile.

[0010] Preferably, the thickness of the flexible sealing layer at the structural seam is greater than the thickness of the flexible sealing layer at other locations.

[0011] Preferably, the thickness of the flexible sealing layer at the structural joint is D×h / d, where D is the maximum width of the structural joint after it is opened, d is the width of the structural joint before it is opened, and h is the thickness of the sealing layer at other locations.

[0012] Preferably, the thickness of the inner concrete lining layer is 30-50cm, and the number of inner concrete lining blocks is 2-4.

[0013] The present invention achieves the following technical effects compared to the prior art:

[0014] This invention divides the inner concrete lining layer into blocks, with structural joints between adjacent blocks. When subjected to compressed air pressure, the blocks can slide along the sliding layer, and the resulting deformation is absorbed by the structural joints through opening or compression, thereby reducing the stress in the inner concrete lining layer and effectively transferring the pressure to the outer concrete lining layer. The inner concrete lining blocks can be cast-in-place or precast. Precasting ensures the quality of the inner concrete lining layer, accelerates construction, saves on project investment, and also guarantees the quality of the sliding layer, which is beneficial for sliding deformation. The significant reduction in stress in the inner concrete lining layer reduces the likelihood of cracking. Even if cracks do occur, the smaller stress results in a significantly reduced crack width, thus preventing the flexible sealing layer from squeezing into the cracks and compromising its airtightness. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the concrete lining structure of the present invention adapted to a soft rock gas storage facility;

[0017] Figure 2 This is a schematic diagram of the structural seam and tension structure of the present invention;

[0018] Wherein: 1-Gas storage; 2-Outer concrete lining layer; 3-Sliding layer; 4-Inner concrete lining layer; 41-Inner concrete lining block; 5-Flexible sealing layer; 6-Structural joint; 7-Tension structure; 8-Adhesive structure. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a concrete lining structure adapted to soft rock gas storage facilities, which can adapt to large deformations, effectively reduce the crack propagation width, ensure the airtightness of the flexible sealing layer, and improve the operational safety of the gas storage facility.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 2 As shown: This embodiment provides a concrete lining structure adapted to soft rock gas storage, including a flexible sealing layer 5, an inner concrete lining layer, a sliding layer 3 and an outer concrete lining layer 2 arranged sequentially from the inside to the outside. The gas storage 1 is formed on the inner side of the flexible sealing layer 5. The inner concrete lining layer includes a plurality of inner concrete lining blocks 41, and there are structural joints 6 between adjacent inner concrete lining blocks 41.

[0023] Specifically, in this embodiment, an outer concrete lining layer 2 is poured inside the excavated gas storage tunnel. The thickness of the outer concrete lining layer 2 is 30-100cm. The main function of the outer concrete lining layer 2 is to level the surface and form a relatively flat concrete surface from the uneven rock surface excavated.

[0024] In this embodiment, a sliding layer 3 is provided on the inner surface of the outer concrete lining layer 2. The thickness of the sliding layer 3 should not be too thick, preferably 0.5 to 1 cm. The sliding layer 3 includes an asphalt layer, an tar paper layer, and an asphalt mastic layer arranged sequentially from the inside out. Specifically, an asphalt layer is applied to the inner surface of the outer concrete lining layer 2, an tar paper layer is laid on the applied asphalt layer, and an asphalt mastic layer is applied to the outside of the tar paper layer to form the sliding layer 3. The sliding layer 3 has a low coefficient of friction, and its function is to separate the outer concrete lining layer 2 from the inner concrete lining layer and reduce the constraint of the inner concrete lining layer, which is beneficial to the free deformation of the inner concrete lining layer.

[0025] In this embodiment, an inner concrete lining layer is poured inside the sliding layer 3. The inner concrete lining layer can also be made of precast concrete. The thickness of the inner concrete lining layer is 30–50 cm, and it is divided into 2–4 inner concrete lining blocks 41. There are gaps between adjacent inner concrete lining blocks 41, namely structural joints 6, which have the ability to open and compress. Because the inner concrete lining layer is divided into blocks, when the weak surrounding rock around the gas storage 1 and the outer concrete lining layer 2 are subjected to significant deformation under pressure, the deformation of the inner concrete lining layer is directly absorbed by the structural joints 6, causing the structural joints 6 to open. This reduces the stress on the inner concrete lining blocks 41, lowers the possibility of cracking in the inner concrete lining layer, or reduces the width of the crack opening, thus improving the safety of the flexible sealing layer 5.

[0026] In this embodiment, a tension structure 7 is provided on the inner side of the structural joint 6 (i.e. the side closer to the gas storage 1). The tension structure 7 is made of fiberglass cloth or geotextile. The two sides of the tension structure 7 are bonded and fixed to the inner concrete lining blocks 41 on both sides of the structural joint 6 at a distance of 50cm (L) from each side of the structural joint 6 through an adhesive structure 8. The two ends of the tension structure 7 extend to the two ends of the structural joint 6. When the structural joint 6 deforms, the fiberglass cloth or geotextile can effectively reduce the elongation rate of the flexible sealing layer 5.

[0027] In this embodiment, a flexible sealing layer 5 is provided on the inner side of the inner concrete lining layer. The flexible sealing layer 5 is made of flexible concrete or an airtight acrylate organic material. The thickness of the flexible sealing layer 5 is increased at the structural joint 6, meaning the thickness of the flexible sealing layer 5 at the structural joint 6 is greater than the thickness at other locations. The thickness D1 of the flexible sealing layer 5 at the structural joint 6 is determined by the calculated maximum opening width of the structural joint 6 and the elongation rate of the flexible sealing layer 5. Specifically, D1 = D × h / d, where D is the maximum width of the structural joint after opening, d is the width of the structural joint before opening, and h is the thickness of the sealing layer at other locations. The increased thickness of the flexible sealing layer 5 at the structural joint 6 ensures that even after elongation, it retains a certain thickness to guarantee the integrity of the flexible sealing layer 5 and prevent air leakage.

[0028] In this embodiment, the concrete lining structure adapted for soft rock gas storage 1 levels the rock excavation surface by setting an outer concrete lining layer 2, forming a flat bottom surface for the sliding layer 3, which is conducive to the sliding of the inner concrete lining layer. The sliding layer 3 has a low coefficient of friction, which facilitates the sliding of the inner concrete lining layer along this surface. The inner concrete lining layer is divided into blocks, and adjacent inner concrete lining blocks 41 are provided with structural joints 6. When subjected to compressed air pressure, they can slide along the sliding layer 3, and the resulting deformation is absorbed by the structural joints 6 through opening or compression, thereby reducing the stress on the inner concrete lining layer and effectively transferring the pressure to the outer concrete lining layer 2. The inner concrete lining blocks 41 can be cast-in-place or precast. Precasting ensures the quality of the inner concrete lining layer and speeds up construction. The project progresses smoothly, saves on engineering investment, and ensures the quality of the sliding layer 3, which is beneficial for sliding deformation. The significant reduction in stress in the inner concrete lining layer reduces the possibility of cracking. Even if cracks do occur, the crack width is significantly reduced due to the smaller stress, thus preventing the flexible sealing layer 5 from being squeezed into the crack and compromising its airtightness when the crack is wide. The deformation of the inner concrete lining layer mainly occurs at the structural joint 6. The opening width of the structural joint 6 is relatively wide, and the thickness of the flexible sealing layer 5 will become thinner after stretching. By thickening the flexible sealing layer 5 at the structural joint 6, a certain safe thickness can be ensured after stretching, thus ensuring the airtightness of the flexible sealing layer 5. Fiberglass cloth or geotextile is installed at the structural joint 6 to reserve a certain deformation space for the stretching of the flexible sealing layer 5 when the structural joint 6 opens and deforms, reducing the stretching rate of the flexible sealing layer 5 and ensuring its safety.

[0029] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A concrete lining structure suitable for soft rock gas storage facilities, characterized in that: It includes a flexible sealing layer, an inner concrete lining layer, a sliding layer and an outer concrete lining layer arranged sequentially from the inside to the outside. The inner side of the flexible sealing layer forms a gas storage tank. The inner concrete lining layer includes a number of inner concrete lining blocks, and there are structural joints between adjacent inner concrete lining blocks. The sliding layer comprises, from the inside out, an asphalt layer, an tar paper layer, and an asphalt mastic layer; The thickness of the sliding layer is 0.5~1.0cm; A tension structure is provided on the inner side of the structural joint, and the two sides of the tension structure are respectively connected to the inner concrete lining blocks on both sides of the structural joint. The tensioning structure is fiberglass cloth or geotextile. The thickness of the flexible sealing layer at the structural joint is greater than the thickness of the flexible sealing layer at other locations. The thickness of the flexible sealing layer at the structural joint is D×h / d, where D is the maximum width of the structural joint after it is opened, d is the width of the structural joint before it is opened, and h is the thickness of the sealing layer at other locations.

2. The concrete lining structure adapted for soft rock gas storage facilities according to claim 1, characterized in that: The thickness of the inner concrete lining layer is 30-50cm, and the number of inner concrete lining blocks is 2-4.

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