Composite lining structure for gas storage and construction method

Abstract

According to the composite lining structure for the gas storage and the construction method, when the gas storage is inflated for the first time, along with inflation, the gas storage pressure is gradually increased, the composite lining structure moves in the direction away from a compressed energy storage cave depot, the gap between every two adjacent pipe pieces is gradually increased, and a hook lock assembly is gradually stretched; when the gas storage pressure reaches the preset pressure, the pressure of the hook lock assembly acting on the capsule is larger than the breaking pressure of the capsule, the capsule is broken, and the expansion material in the capsule expands and fills the sealing assembly. In the annular direction of the composite lining structure, the multiple pipe pieces and the hook lock assemblies extruded by the expansion materials are always in the mutual extrusion state, the whole composite lining structure is not subjected to tensile stress in the annular direction, and therefore the problem that the sealing performance of a gas storage is poor due to the fact that a lining cracks due to large tensile stress is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a composite lining structure for a gas storage reservoir and a construction method thereof. Background Art

[0002] Compressed air energy storage technology offers the advantages of large-scale, long-term energy storage, and low costs. It holds great promise for clean energy and flexible peak-shaving in power grids, making it a key enabling technology for building new power systems. Compressed air energy storage reservoirs are inflated and deflated daily. This continuous increase in internal pressure causes significant tensile stress in the concrete lining.

[0003] However, the current lining structure of gas storage reservoirs is mainly cast as a whole on site. Ordinary integrally cast concrete linings have excellent compressive strength but poor tensile strength. During the cyclic charging and degassing process of the gas storage reservoir, the concrete lining will crack due to the large tensile stress, seriously affecting the bearing capacity and overall stability of the gas storage reservoir. In addition, with the appearance of cracks, the sealing layer will produce stress concentration at these unevenly distributed and large-opening cracks. The sealing layer near the cracks is squeezed into the cracks by the internal high-pressure gas and is eventually torn, seriously affecting the sealing performance of the gas storage reservoir. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite lining structure and construction method for a gas storage reservoir, aiming to solve the problem that the concrete lining of the existing gas storage reservoir will crack due to the large tensile stress, resulting in poor sealing performance of the gas storage reservoir.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: On the one hand, a composite lining structure for a gas storage reservoir is provided, which is applied to the outside of a compression energy storage cavern, comprising: a plurality of segments, a sealing layer, a hook lock assembly, a sealing assembly, and a capsule, wherein the plurality of segments are arranged end to end and surround the outside of the compression energy storage cavern; the sealing layer is arranged between the compression energy storage cavern and the plurality of segments; the hook lock assembly is stretchably arranged between two adjacent segments, and the two ends of the hook lock assembly are respectively connected to the two adjacent segments; the sealing assembly is sleeved on the outside of the hook lock assembly, and the two ends of the sealing assembly are respectively connected to the two adjacent segments; The capsule is arranged in the hook lock assembly, and the capsule is filled with expansion material; wherein, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, the composite lining structure moves in the direction away from the compression energy storage cavern, the gap between adjacent pipe segments gradually increases, the hook lock assembly gradually stretches, and the pressure exerted by the hook lock assembly on the capsule also gradually increases. When the gas storage pressure reaches a preset pressure, the pressure exerted on the capsule by the hook lock assembly is greater than the rupture pressure of the capsule, the capsule ruptures, and the expansion material in the capsule expands and fills the sealing assembly. The preset pressure is greater than the maximum gas storage pressure designed for the gas storage reservoir.

[0006] Furthermore, the composite lining structure for a gas storage facility further includes: a flexible concrete layer, wherein the flexible concrete layer is arranged between the sealing layer and the plurality of pipe segments.

[0007] Furthermore, a first connecting plate is provided at both ends of the pipe segment, and a plurality of first connecting parts and a plurality of second connecting parts are provided on the first connecting plate. The first connecting part is used to connect the hook lock assembly, and the second connecting part is used to connect the sealing assembly.

[0008] Furthermore, the hook lock assembly includes: a first hook lock and a second hook lock, the first hook lock and the second hook lock are slidably connected together, a accommodating cavity is formed between the first hook lock and the second hook lock, and the capsule is arranged in the accommodating cavity; wherein, when the gas storage reservoir is inflated for the first time, the hook lock assembly stretches and squeezes the accommodating cavity.

[0009] Furthermore, the first hook lock includes a first connecting wall and a first extrusion wall that are relatively connected, the second hook lock includes a second connecting wall and a second extrusion wall that are relatively connected, the second extrusion wall is slidably connected between the first connecting wall and the first extrusion wall, the accommodating cavity is arranged between the first extrusion wall and the second extrusion wall, and the first connecting wall and the second connecting wall respectively connect two adjacent pipe segments.

[0010] Furthermore, a plurality of avoidance holes are provided on the first extrusion wall and the second extrusion wall, and the avoidance holes are used to allow the expansion material to pass through when the capsule ruptures.

[0011] Furthermore, the sealing assembly includes: two opposing sealing frames, a plurality of second connecting plates and a sealing rubber; the plurality of second connecting plates are connected to the sealing frames and used to connect two adjacent pipe segments; the sealing rubber is stretchably connected between the two sealing frames.

[0012] Furthermore, the sealing rubber is wrinkled. When the gas storage reservoir is not inflated, the sealing rubber is folded. When the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases and the sealing rubber gradually unfolds.

[0013] Furthermore, the sealing layer is a polyurea sealing layer.

[0014] In another aspect, a construction method for a composite lining structure for a gas storage reservoir is provided, comprising: Install the pipe segments on the outside of the compression energy storage cavern; Connecting a first hook lock to the pipe segment and connecting a second hook lock to another adjacent pipe segment; placing the capsule in the receiving cavity; The segment installation machine is driven by a hydraulic pressure to drive two adjacent segments to move toward each other until the first hook lock and the second hook lock are closed and connected; The sealing assembly is sleeved on the outside of the hook lock assembly and connected to two adjacent pipe segments respectively; sequentially installing a plurality of the pipe segments, the hook lock assembly, and the sealing assembly; Arrange a sealing layer on the outside of the compressed energy storage cavern; Disposing a flexible concrete layer between the sealing layer and the plurality of segments; Inflating the gas storage reservoir for the first time, when the pressure exerted by the hook lock assembly on the capsule is greater than the bursting pressure of the capsule, the expansion material in the capsule expands and fills the sealing assembly; After the expansion material solidifies, the inflation of the gas storage reservoir is stopped.

[0015] An embodiment of the present invention provides a composite lining structure and construction method for a gas storage reservoir, wherein the composite lining structure for a gas storage reservoir is applied to the outside of a compression energy storage cavern, and comprises: a plurality of pipe segments, a sealing layer, a hook lock assembly, a sealing assembly and a capsule, wherein the plurality of pipe segments are arranged end to end and surround the outside of the compression energy storage cavern; the sealing layer is arranged between the compression energy storage cavern and the plurality of pipe segments; the hook lock assembly is stretchably arranged between two adjacent pipe segments, and the two ends of the hook lock assembly are respectively connected to the two adjacent pipe segments; the sealing assembly is sleeved on the outside of the hook lock assembly, and the two ends of the sealing ... The capsule is arranged in the hook lock assembly, and the capsule is filled with expansion material; wherein, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, the composite lining structure moves in the direction away from the compression energy storage cavern, the gap between adjacent pipe segments gradually increases, the hook lock assembly gradually stretches, and the pressure exerted by the hook lock assembly on the capsule gradually increases. When the gas storage pressure reaches the preset pressure, the pressure exerted on the capsule by the hook lock assembly is greater than the rupture pressure of the capsule, the capsule ruptures, and the expansion material in the capsule expands and fills the sealing assembly. The preset pressure is greater than the maximum gas storage pressure designed for the gas storage reservoir. The present invention arranges multiple pipe segments end to end and surrounds the outside of the compression energy storage cavern. By setting a sealing layer between the compression energy storage cavern and the multiple pipe segments, the compression energy storage cavern can be effectively sealed. In addition, the two ends of the sealing component are respectively connected to two adjacent pipe segments, that is, the sealing component wraps the hook lock component between the two adjacent pipe segments. Because a capsule filled with expansion material is provided in the hook lock component, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, the surrounding rock and multiple pipe segments all move in the direction away from the compression energy storage cavern, the gap between adjacent pipe segments gradually increases, the hook lock component gradually stretches, and the pressure exerted by the hook lock component on the capsule also gradually increases. When the gas storage pressure reaches the preset pressure, the pressure exerted on the capsule by the hook lock component is greater than the capsule. The bursting pressure of the bag, the capsule bursts, the expansion material in the capsule expands and fills the sealing component. Since the inflation pressure of the gas storage reservoir for the first time reaches the preset pressure, which is greater than the maximum gas storage pressure designed for the gas storage reservoir, multiple pipe segments are fully squeezed open and moved to the extreme position. At this point, after the expansion material solidifies, the entire composite lining structure is formed, and then the gas storage reservoir is deflated to reduce the gas storage pressure to the designed operating pressure, which is less than the maximum gas storage pressure of the gas storage reservoir. At this time, in the circumferential direction of the composite lining structure, multiple pipe segments and the hook lock components squeezed by the expansion material are always in a state of mutual squeezing, that is, the entire composite lining structure is not subjected to tensile stress in the circumferential direction, thereby solving the problem that the lining will crack due to the large tensile stress, resulting in poor sealing performance of the gas storage reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a gas storage facility provided in an embodiment of the present invention; Figure 2 A partial view of an embodiment of the present invention; Figure 3 A schematic structural diagram of a pipe segment provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of the connection between the pipe segment and the hook lock assembly provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of the connection between the pipe segment and the sealing assembly provided in an embodiment of the present invention; Figure 6 A schematic structural diagram of a capsule provided by an embodiment of the present invention; Figure 7 A schematic structural diagram of a hook lock assembly provided by an embodiment of the present invention in an unstretched state; Figure 8 A schematic structural diagram of a hook lock assembly provided by an embodiment of the present invention in a stretched state from a first perspective; Figure 9 A schematic structural diagram of a hook lock assembly provided by an embodiment of the present invention in a stretched state from a second perspective; Figure 10 A schematic structural diagram of a sealing assembly provided in an embodiment of the present invention; Figure 11 A cross-sectional view of the connection between a pipe segment and a sealing assembly provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the expansion material after expansion provided by an embodiment of the present invention.

[0018] Description of the symbols in the figure: 1. Compressed energy storage cavern; 2. Tube segment; 21. First connecting plate; 211. First connecting portion; 212. Second connecting portion; 3. Sealing layer; 4. Hook lock assembly; 41. First hook lock; 411. First connecting wall; 412. First extrusion wall; 42. Second hook lock; 421. Second connecting wall; 422. Second extrusion wall; 43. Accommodating cavity; 44. Stiffening rib; 45. Third connecting portion; 46. Avoidance hole; 5. Sealing assembly; 51. Sealing frame; 52. Second connecting plate; 53. Sealing rubber; 521. Fourth connecting portion; 6. Capsules; 7. Flexible concrete layer; 8. Composite lining structure; 9. Surrounding rock. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should be further understood that the term "and / or" used in the present description and appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0023] Combine Figure 1-12As shown, the present invention provides a composite lining structure 8 for a gas storage reservoir, which is applied to the outside of a compression energy storage cavern 1 and includes: a plurality of pipe segments 2, a sealing layer 3, a hook lock assembly 4, a sealing assembly 5 and a capsule 6. The plurality of pipe segments 2 are arranged end to end and surround the outside of the compression energy storage cavern 1; the sealing layer 3 is arranged between the compression energy storage cavern 1 and the plurality of pipe segments 2; the hook lock assembly 4 is stretchably arranged between two adjacent pipe segments 2, and the two ends of the hook lock assembly 4 are respectively connected to the two adjacent pipe segments 2; the sealing assembly 5 is sleeved on the outside of the hook lock assembly 4, and the two ends of the sealing assembly 5 are respectively connected to the two adjacent pipe segments 2; the capsule 6 is arranged between the hook lock assembly 4 and the two ends of the sealing assembly 5 are respectively connected to the two adjacent pipe segments 2. 4, and the capsule 6 is filled with expansion material; wherein, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, the composite lining structure 8 moves in the direction away from the compression energy storage cavern 1, the gap between adjacent pipe segments 2 gradually increases, the hook lock assembly 4 gradually stretches, and the pressure exerted by the hook lock assembly 4 on the capsule 6 also gradually increases. When the gas storage pressure reaches the preset pressure, the pressure exerted by the hook lock assembly 4 on the capsule 6 is greater than the rupture pressure of the capsule 6, the capsule 6 ruptures, and the expansion material in the capsule 6 expands and fills the sealing assembly 5. The preset pressure is greater than the maximum gas storage pressure designed for the gas storage reservoir.

[0024] It can be understood that the gas storage reservoir includes a compression energy storage cavern 1, a composite lining structure 8, and surrounding rock 9 arranged on the outside of the composite lining structure 8. Compared with the existing ordinary integrally cast concrete lining, the embodiment of the present invention arranges multiple pipe segments 2 end to end and surrounds the outside of the compression energy storage cavern 1. By arranging the sealing layer 3 between the compression energy storage cavern 1 and the multiple pipe segments 2, the compression energy storage cavern 1 can be effectively sealed, and the two ends of the sealing component 5 are respectively connected to two adjacent pipe segments 2, that is, the sealing component 5 wraps the hook lock component 4 between the two adjacent pipe segments 2. Because the hook lock component 4 is provided with a capsule 6 filled with an expansion material, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, and the surrounding rock 9 and the multiple pipe segments 2 are all facing away from the compression energy storage cavern 1. , the gap between adjacent segments 2 gradually increases, the hook lock assembly 4 gradually stretches, and the pressure exerted by the hook lock assembly 4 on the capsule 6 gradually increases. When the gas storage pressure reaches the preset pressure, the preset pressure is the critical pressure at which the pressure of the hook lock assembly 4 on the capsule 6 can just cause the capsule 6 to rupture. The pressure exerted by the hook lock assembly 4 on the capsule 6 is greater than the rupture pressure of the capsule 6, the capsule 6 ruptures, and the expansion material in the capsule 6 expands and fills the sealing assembly 5. Since the preset pressure is greater than the designed maximum gas storage pressure, multiple segments 2 are fully squeezed open and moved to the extreme position. At this point, after the expansion material solidifies, the entire composite lining structure 8 is formed, and then the gas storage reservoir is deflated to reduce the gas storage pressure to the designed operating pressure, which is less than the maximum gas storage pressure of the gas storage reservoir.

[0025] After the entire composite lining structure 8 is formed, the pressure inside the gas storage reservoir cannot exceed the maximum gas storage pressure of the gas storage reservoir during the subsequent deflation and inflation cycles. The composite lining structure 8 is applied to the outside of the compression energy storage cavern 1, so that the entire composite lining structure 8 has a tendency to shrink. In the circumferential direction of the composite lining structure 8, multiple pipe segments 2 and the hook lock assembly 4 stretched to the extreme position are always in a state of mutual extrusion, that is, the entire composite lining structure 8 is not subjected to tensile stress in the circumferential direction, thereby solving the problem that the lining will crack due to the large tensile stress, resulting in poor sealing performance of the gas storage reservoir.

[0026] Specifically, a thin membrane within the capsule 6 separates the solid material and water. The solid material is thoroughly mixed and placed inside the capsule. After the capsule ruptures, the pressure from the hook-lock structure ensures that the solid material and water in the expansive material mix and react evenly. The expansive filler is expansive concrete designed in accordance with the specification "Concrete Expansive Agents" (GB / T 23439-2017). It can achieve the required volume expansion rate, that is, completely fill the entire sealing component 5. In an actual application scenario, the expansive material is expansive concrete with the following material mix: special calcium silicate cement at a content of 45%; ultrafine silica fume at a content of 15%; ettringite expansive agent at a content of 20%, which increases the volume of the expansive filler by approximately 200% or more; active magnesium oxide at a content of 8% to provide a delayed expansion effect; nano-silica at a content of 3%; high-efficiency water reducer at a content of 1.5%; accelerator at a content of 0.5%; and hydrophilic expansive resin at a content of 7% to provide additional expansion capacity. The amount of water is designed based on the strength requirements of the expansive filler in the actual project.

[0027] For example, in an actual application scenario, the maximum gas storage pressure P of the gas storage reservoir is designed to be s To ensure that the gas storage segment 2 is fully squeezed open, the preset pressure P is 15 MPa. max =20MPa, calculated by finite element software, the pressure on the capsule 6 in the hook lock assembly 4 is 23MPa when the internal pressure is 20MPa, and the rupture pressure threshold of the capsule 6 is 23MPa±1MPa. max This refers to the initial inflation pressure of the gas storage reservoir. When the pressure exerted by the hook lock assembly 4 on the capsule 6 within the gas storage reservoir at an internal pressure of 20 MPa reaches the rupture pressure of the capsule 6, the capsule 6 ruptures, and the expansion material within the capsule 6 expands and fills the sealing assembly 5. Specifically, the pressure exerted by the hook lock assembly 4 on the capsule 6 is sufficient to achieve the critical pressure at which the capsule 6 ruptures. This pressure is determined based on actual project conditions and numerical simulation.

[0028] In an actual application scenario, the Q345 steel plate used in the hook lock assembly 4 meets the tensile strength requirement when the safety factor is 2. The safety factor is 2, that is, the ratio of the load-bearing capacity of the hook lock assembly 4 to the actual working load is 2. The thickness of the steel plate is 100 mm. Among them, a plurality of stiffening ribs 44 are arranged in the hook lock assembly 4. The thickness of the stiffening ribs 44 is 30 mm. The thickness of the steel plate with the stiffening ribs 44 is 120 mm to ensure sufficient rigidity.

[0029] In an actual application scenario, the wall thickness of capsule 6 is 0.3 mm ± 0.02 mm, the material is biodegradable polylactic acid, and 2% nano-silicon dioxide is added to increase the strength.

[0030] In some embodiments, the composite lining structure 8 for a gas storage facility further includes a flexible concrete layer 7 , which is disposed between the sealing layer 3 and the plurality of pipe segments 2 .

[0031] In this embodiment, flexible concrete, i.e., concrete mixed with reinforcing materials such as steel fiber and polypropylene fiber, has a flexibility of 100-400 times that of ordinary concrete, can withstand large bending deformation without breaking, and forms microcracks rather than brittle failure. The ultimate elongation exceeds 3%, while ordinary concrete is about 0.01%. The tensile strength is increased by 3-5 times compared with ordinary concrete. The flexible concrete layer 7 has a strong deformation ability. The flexible concrete layer 7 is arranged between the sealing layer 3 and multiple pipe segments 2, which can enhance the deformation coordination ability of the sealing layer 3 and prevent gaps between the pipe segments 2, thereby preventing the sealing layer 3 from generating stress concentration at the cracks in the pipe segment 2 and the joints of adjacent pipe segments 2, thereby preventing the sealing layer 3 from being torn.

[0032] In some embodiments, a first connecting plate 21 is provided at both ends of the pipe segment 2, and a plurality of first connecting portions 211 and a plurality of second connecting portions 212 are provided on the first connecting plate 21. The first connecting portion 211 is used to connect the hook lock assembly 4, and the second connecting portion 212 is used to connect the sealing assembly 5.

[0033] In this embodiment, the first connecting portion 211 is used to connect the hook lock assembly 4, which helps to ensure the stability of the connection between the hook lock assembly 4 and the pipe segment 2 when the hook lock assembly 4 is stretched and the pipe segment 2 moves away from the compression energy storage cavern 1. The second connecting portion 212 is used to connect the sealing assembly 5, which helps to ensure the sealing performance of the sealing assembly 5. After the expansion material expands and fills the entire sealing assembly 5, it ensures that there will be no gap between the sealing assembly 5 and the pipe segment 2, thereby ensuring the stability of the entire composite lining structure 8.

[0034] Specifically, the first connecting plate 21 is a steel plate to ensure sufficient rigidity. The first connecting member is arranged on the plate surface facing the first connecting plate 21, and the second connecting member is arranged on the end surface of the first connecting plate 21. The first connecting plate 21, the first connecting member and the second connecting member are integrally formed to facilitate processing and production.

[0035] In some embodiments, the hook lock assembly 4 includes: a first hook lock 41 and a second hook lock 42, the first hook lock 41 and the second hook lock 42 are slidably connected together, and a accommodating cavity 43 is formed between the first hook lock 41 and the second hook lock 42, and the capsule 6 is arranged in the accommodating cavity 43; wherein, when the gas storage reservoir is inflated for the first time, the hook lock assembly 4 stretches and squeezes the accommodating cavity 43.

[0036] In this embodiment, the first hook lock 41 and the second hook lock 42 are slidable. When the gas storage reservoir is not inflated, a accommodating cavity 43 is formed between the first hook lock 41 and the second hook lock 42, providing a placement space for the capsule 6. When the gas storage reservoir is inflated for the first time, the hook lock assembly 4 stretches and squeezes the accommodating cavity 43, causing the internal space of the accommodating cavity 43 to gradually shrink, thereby squeezing the capsule 6. When the gas storage pressure reaches the preset pressure, the pressure exerted on the capsule 6 by the hook lock assembly 4 is greater than the rupture pressure of the capsule 6, the capsule 6 ruptures, and the expansion material in the capsule 6 expands and fills the sealing assembly 5.

[0037] In some embodiments, the first hook lock 41 includes a first connecting wall 411 and a first extrusion wall 412 that are relatively connected, and the second hook lock 42 includes a second connecting wall 421 and a second extrusion wall 422 that are relatively connected, and the second extrusion wall 422 is slidably connected between the first connecting wall 411 and the first extrusion wall 412, and the accommodating cavity 43 is arranged between the first extrusion wall 412 and the second extrusion wall 422, and the first connecting wall 411 and the second connecting wall 421 respectively connect two adjacent pipe segments 2.

[0038] In this embodiment, the second extrusion wall 422 is slidably connected between the first connecting wall 411 and the first extrusion wall 412, so that the first hook lock 41 and the second hook lock 42 can slide, and the accommodating chamber 43 is arranged between the first extrusion wall 412 and the second extrusion wall 422. When the gas storage reservoir is inflated for the first time, since the first connecting wall 411 and the second connecting wall 421 respectively connect two adjacent pipe segments 2, as the inflation proceeds, the gas storage pressure gradually increases, the surrounding rock 9 and multiple pipe segments 2 all move in the direction away from the compression energy storage cavern 1, and the gap between adjacent pipe segments 2 gradually increases. The adjacent pipe segments 2 respectively drive the first connecting wall 411 and the second connecting wall 421 to move, so that the second extrusion wall 422 slides toward the first connecting wall 411, thereby causing the internal space of the accommodating chamber 43 to gradually shrink and squeeze the capsule 6. When the gas storage pressure reaches the preset pressure, the pressure exerted on the capsule 6 by the hook lock assembly 4 is greater than the rupture pressure of the capsule 6, the capsule 6 ruptures, and the expansion material in the capsule 6 expands and fills the sealing assembly 5.

[0039] Specifically, a plurality of stiffening ribs 44 are provided on the side of the second extrusion wall 422 facing the first connecting wall 411. Since the hook lock assembly 4 has less constraint on the contact surface with the capsule 6 and bears a larger load, the deflection at the end is larger. Therefore, the second extrusion wall 422 is thickened and stiffening ribs 44 are provided to ensure its overall stability and sufficient rigidity.

[0040] Specifically, a plurality of third connection portions 45 are provided on each of the first connection wall 411 and the second connection wall 421 , and the third connection portions 45 are connected to the first connection portions 211 .

[0041] In this embodiment, the third connecting portion 45 is connected to the first connecting portion 211, ensuring a stable connection between the hook lock assembly 4 and the segment 2. Specifically, the third connecting portion 45 is disposed on the outer panels of the first hook lock 41 and the second hook lock 42, and the third connecting portion 45 and the hook lock assembly 4 are integrally formed, facilitating manufacturing. More specifically, both the third connecting portion 45 and the first connecting portion 211 have bolt holes, and are connected together by bolts, ensuring a stable connection between the hook lock assembly 4 and the segment 2.

[0042] In some embodiments, a plurality of avoidance holes 46 are provided on the first extrusion wall 412 and the second extrusion wall 422 . The avoidance holes 46 are used to allow the expansion material to pass through when the capsule 6 ruptures.

[0043] In this embodiment, the escape holes 46 are used to allow the expansion material to pass through when the bladder 6 ruptures, helping the expansion material fill the entire sealing assembly 5, thereby ensuring that the entire composite lining structure 8 is formed after the expansion material solidifies. Specifically, the escape holes 46 are evenly arranged on the first hook lock 41 and the second hook lock 42 to ensure uniform expansion of the expansion material, so that the sealing assembly 5 is completely filled.

[0044] In an actual application scenario, a 5 mm avoidance hole 46 is arranged on the surface of the hook lock assembly 4 to ensure that the expansive concrete material can quickly fill the internal space of the connection and solidify with sufficient strength in a short time, thereby forming a permanent support structure.

[0045] In some embodiments, the sealing assembly 5 includes: two opposing sealing frames 51, multiple second connecting plates 52 and a sealing rubber 53; the multiple second connecting plates 52 are connected to the sealing frames 51 and are used to connect two adjacent pipe segments 2; the sealing rubber 53 is stretchably connected between the two sealing frames 51.

[0046] In this embodiment, the connection between the sealing frame 51, multiple second connecting plates 52 and the sealing rubber 53 ensures that the sealing assembly 5 wraps the hook lock assembly 4 between two adjacent pipe segments 2. The second connecting plate 52 connects the two adjacent pipe segments 2, so that the connection between the sealing assembly 5 and the pipe segment 2 is firm, preventing the presence of gaps between the sealing assembly 5 and the pipe segment 2. The sealing rubber 53 is stretchably connected between the two sealing frames 51. When the gas storage is inflated, the sealing rubber 53 stretches with the movement of the pipe segment 2, thereby providing expansion space for the expansion material, ensuring the full deployment of the entire composite lining structure 8, and after the expansion material solidifies, the entire composite lining structure 8 is formed.

[0047] Specifically, a plurality of fourth connection portions 521 are provided on the second connection plate 52 , and the fourth connection portions 521 are connected to the second connection portions 212 .

[0048] In this embodiment, the fourth connecting portion 521 is connected to the second connecting portion 212, ensuring a stable connection between the sealing assembly 5 and the tube segment 2. Specifically, the fourth connecting portion 521 is disposed on the inner surface of the second connecting plate 52, and the fourth connecting portion 521 and the second connecting plate 52 are integrally formed, facilitating manufacturing. More specifically, the fourth connecting portion 521 and the second connecting portion 212 both have bolt holes, and are connected together by bolts, ensuring a stable connection between the sealing assembly 5 and the tube segment 2.

[0049] In some embodiments, the sealing rubber 53 is wrinkled. When the gas storage reservoir is not inflated, the sealing rubber 53 is folded. When the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases and the sealing rubber 53 gradually unfolds.

[0050] In this embodiment, the sealing rubber 53 is wrinkled, which helps to stretch the sealing component. As the inflation progresses, the gas storage pressure gradually increases, and the sealing rubber 53 gradually expands, providing expansion space for the expansion material.

[0051] In some embodiments, the sealing layer 3 is a polyurea sealing layer.

[0052] In this embodiment, compared with the traditional use of steel plate as a sealing material, polyurea is a polymer synthetic material. Using polyurea material as the sealing layer 3 can greatly reduce construction costs. In addition, the polyurea sealing layer has stronger tensile deformation ability and anti-aging ability than steel lining and is low in cost.

[0053] The present invention also provides a construction method for a composite lining structure 8 for a gas storage reservoir, comprising steps S10 to S100: S10, installing the pipe segment 2 on the outside of the compression energy storage cavern 1; S20, connecting the first hook lock 41 to the pipe segment 2, and connecting the second hook lock 42 to another adjacent pipe segment 2; S30, placing the capsule 6 in the accommodating cavity 43; S40, driving the segment 2 installation machine hydraulically to move two adjacent segments 2 toward each other until the first hook lock 41 and the second hook lock 42 are closed and connected; S50, sleeve the sealing assembly 5 on the outside of the hook lock assembly 4 and connect two adjacent pipe segments 2 respectively; S60, sequentially installing multiple segments 2, hook lock assemblies 4, and sealing assemblies 5; S70, setting the sealing layer 3 on the outside of the compression energy storage cavern 1; S80, placing a flexible concrete layer 7 between the sealing layer 3 and the plurality of pipe segments 2; S90, the gas storage reservoir is inflated for the first time. When the pressure exerted by the hook lock assembly 4 on the capsule 6 is greater than the rupture pressure of the capsule 6, the expansion material in the capsule 6 expands and fills the sealing assembly 5; S100: After the expansion material solidifies, the inflation of the gas storage is stopped.

[0054] In the embodiment of the present invention, the gas storage reservoir includes a compression energy storage cavern 1, a composite lining structure 8, and surrounding rock 9 arranged on the outside of the composite lining structure 8. Compared with the existing ordinary integrally cast concrete lining, the embodiment of the present invention arranges multiple pipe segments 2 end to end and surrounds the outside of the compression energy storage cavern 1. By arranging a sealing layer 3 between the compression energy storage cavern 1 and the multiple pipe segments 2, the compression energy storage cavern 1 can be effectively sealed, and the two ends of the sealing component 5 are respectively connected to two adjacent pipe segments 2, that is, the sealing component 5 wraps the hook lock component 4 between the two adjacent pipe segments 2. Because the hook lock component 4 is provided with a capsule 6 filled with an expansion material, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, the surrounding rock 9 and the multiple pipe segments 2 all move in a direction away from the compression energy storage cavern 1, the gap between the adjacent pipe segments 2 gradually increases, and the hook lock component 4 gradually stretches. The pressure exerted by the hook lock component 4 on the capsule 6 also gradually increases. When the gas storage pressure reaches the preset pressure, the pressure exerted by the hook lock component 4 on the capsule 6 is greater than the rupture pressure of the capsule 6. The capsule 6 ruptures, and the expansion material in the capsule 6 expands and fills the sealing component 5. Since the preset pressure is greater than the maximum gas storage pressure, multiple pipe segments 2 are fully squeezed open and moved to the extreme position. At this point, after the expansion material solidifies, the entire composite lining structure 8 is formed, and then the gas storage reservoir is deflated to lower the gas storage pressure to the designed operating pressure. The designed operating pressure is less than the maximum gas storage pressure of the gas storage reservoir. In the circumferential direction of the composite lining structure 8, multiple pipe segments 2 and the hook lock component 4 stretched to the extreme position are always in a state of mutual extrusion, that is, the entire composite lining structure 8 is not subjected to tensile stress in the circumferential direction, thereby solving the problem that the lining will crack due to the large tensile stress, resulting in poor sealing performance of the gas storage reservoir.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A composite lining structure for a gas storage reservoir, applied to the outside of a compressed energy storage cavern, characterized in that: include: A plurality of pipe segments, wherein the plurality of pipe segments are arranged end to end and surround the outside of the compression energy storage cavern; A sealing layer, the sealing layer being arranged between the compression energy storage cavern and the plurality of pipe segments; A hook lock assembly, wherein the hook lock assembly is stretchably disposed between two adjacent tube segments, and two ends of the hook lock assembly are respectively connected to the two adjacent tube segments; A sealing assembly, wherein the sealing assembly is sleeved on the outside of the hook lock assembly, and the two ends of the sealing assembly are respectively connected to two adjacent pipe segments; a capsule, the capsule being disposed in the hook lock assembly and filled with an expansion material; Among them, when the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases, the composite lining structure moves in the direction away from the compression energy storage cavern, the gap between adjacent pipe segments gradually increases, the hook lock assembly gradually stretches, and the pressure exerted by the hook lock assembly on the capsule gradually increases. When the gas storage pressure reaches the preset pressure, the pressure exerted by the hook lock assembly on the capsule is greater than the rupture pressure of the capsule, the capsule ruptures, and the expansion material in the capsule expands and fills the sealing assembly. The preset pressure is greater than the maximum gas storage pressure designed for the gas storage reservoir.

2. The composite lining structure for a gas storage facility according to claim 1, characterized in that: Also includes: A flexible concrete layer is provided between the sealing layer and the plurality of pipe segments.

3. The composite lining structure for a gas storage facility according to claim 1, characterized in that: Both ends of the pipe segment are provided with a first connecting plate, and the first connecting plate is provided with a plurality of first connecting parts and a plurality of second connecting parts. The first connecting parts are used to connect the hook lock assembly, and the second connecting parts are used to connect the sealing assembly.

4. The composite lining structure for a gas storage facility according to claim 1, characterized in that: The hook lock assembly includes: a first hook lock and a second hook lock, wherein the first hook lock and the second hook lock are slidably connected together, a receiving cavity is formed between the first hook lock and the second hook lock, and the capsule is disposed in the receiving cavity; When the gas storage reservoir is inflated for the first time, the hook lock assembly stretches and squeezes the accommodating cavity.

5. The composite lining structure for a gas storage facility according to claim 4, characterized in that: The first hook lock includes a first connecting wall and a first extrusion wall that are relatively connected, and the second hook lock includes a second connecting wall and a second extrusion wall that are relatively connected. The second extrusion wall is slidably connected between the first connecting wall and the first extrusion wall. The accommodating cavity is arranged between the first extrusion wall and the second extrusion wall. The first connecting wall and the second connecting wall respectively connect two adjacent pipe segments.

6. The composite lining structure for a gas storage facility according to claim 5, characterized in that: A plurality of avoidance holes are provided on the first extrusion wall and the second extrusion wall, and the avoidance holes are used for allowing expansion material to pass through when the capsule ruptures.

7. The composite lining structure for a gas storage facility according to claim 1, characterized in that: The sealing assembly comprises: two opposing sealing frames; a plurality of second connecting plates, which are connected to the sealing frame and used to connect two adjacent tube segments; A sealing rubber is stretchably connected between the two sealing frames.

8. The composite lining structure for a gas storage facility according to claim 7, characterized in that: The sealing rubber is in a wrinkled shape. When the gas storage reservoir is not inflated, the sealing rubber is in a folded shape. When the gas storage reservoir is inflated for the first time, as the inflation proceeds, the gas storage pressure gradually increases and the sealing rubber gradually unfolds.

9. The composite lining structure for a gas storage facility according to claim 1, characterized in that: The sealing layer is a polyurea sealing layer.

10. A construction method for a composite lining structure for a gas storage facility, characterized in that: include: Install the pipe segments on the outside of the compression energy storage cavern; Connecting a first hook lock to the pipe segment and connecting a second hook lock to another adjacent pipe segment; placing the capsule in the receiving cavity; The segment installation machine is driven by a hydraulic pressure to drive two adjacent segments to move toward each other until the first hook lock and the second hook lock are closed and connected; The sealing assembly is sleeved on the outside of the hook lock assembly and connected to two adjacent pipe segments respectively; sequentially installing a plurality of the pipe segments, the hook lock assembly, and the sealing assembly; Arrange a sealing layer on the outside of the compressed energy storage cavern; Disposing a flexible concrete layer between the sealing layer and the plurality of segments; Inflating the gas storage reservoir for the first time, when the pressure exerted by the hook lock assembly on the capsule is greater than the bursting pressure of the capsule, the expansion material in the capsule expands and fills the sealing assembly; After the expansion material solidifies, the inflation of the gas storage reservoir is stopped.

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