A composite lining structure and construction method for gas storage facilities

Abstract

This invention discloses a composite lining structure and construction method for a gas storage facility. During the initial inflation of the gas storage facility, as inflation progresses and the gas pressure gradually increases, the composite lining structure moves away from the compressed energy storage tunnel. The gaps between adjacent segments gradually increase, the hook-lock assembly gradually stretches, and the pressure exerted by the hook-lock assembly on the capsule gradually increases. When the gas pressure reaches a preset pressure, the pressure exerted by the hook-lock assembly on the capsule exceeds the capsule's rupture pressure, causing the capsule to rupture. The expansion material inside the capsule expands and fills the sealing assembly. This invention solves the problem of poor sealing performance of the gas storage facility caused by cracking of the lining due to excessive tensile stress in the circumferential direction, as multiple segments and the hook-lock assembly compressed by the expansion material are always in a state of mutual compression in the composite lining structure.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, and in particular to a composite lining structure and construction method for gas storage facilities. Background Technology

[0002] Compressed air energy storage technology boasts advantages such as large-scale, long-term energy storage and low cost, showing promising prospects in clean energy and flexible peak shaving for power grids. It is a key supporting technology for building new power systems. The compressed air energy storage power station's storage tank undergoes daily inflation and deflation. During inflation, the internal air pressure continuously increases, causing the concrete lining to bear significant tensile stress in the circumferential direction.

[0003] However, the lining structure of gas storage facilities is currently mainly cast monolithically on site. Ordinary monolithically cast concrete linings have excellent compressive strength but poor tensile strength. During the gas storage facility's cyclic filling and discharging process, the concrete lining will crack due to the large tensile stress, which seriously affects the load-bearing capacity and overall stability of the gas storage facility. Furthermore, with the appearance of cracks, stress concentration will occur in the sealing layer at these unevenly distributed cracks with large openings. The sealing layer near the cracks will be squeezed into the cracks by the internal high-pressure gas and eventually torn, which seriously affects the sealing performance of the gas storage facility. Summary of the Invention

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

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: On one hand, a composite lining structure for a gas storage facility is provided, applied to the outside of a compressed energy storage cavern, comprising: multiple segments, a sealing layer, a hook-and-lock assembly, a sealing assembly, and a capsule; the multiple segments are arranged end-to-end and surround the outside of the compressed energy storage cavern; the sealing layer is disposed between the compressed energy storage cavern and the multiple segments; the hook-and-lock assembly is stretchably disposed between two adjacent segments, and both ends of the hook-and-lock assembly are respectively connected to two adjacent segments; the sealing assembly is sleeved on the outside of the hook-and-lock assembly, and both ends of the sealing assembly are respectively connected to two adjacent segments. The capsule is disposed within the hook-lock assembly and is filled with an expanding material. During the initial inflation of the gas storage tank, as inflation proceeds, the gas storage pressure gradually increases, the composite lining structure moves away from the compressed energy storage tunnel, the gap between adjacent 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 a preset pressure, the pressure exerted by the hook-lock assembly on the capsule exceeds the rupture pressure of the capsule, causing the capsule to rupture. The expanding material inside the capsule expands and fills the sealing assembly. The preset pressure is greater than the maximum gas storage pressure designed for the gas storage tank.

[0006] Furthermore, the composite lining structure for the gas storage facility also includes a flexible concrete layer disposed between the sealing layer and the plurality of the tube segments.

[0007] Furthermore, each end of the tube segment is 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.

[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 being slidably connected together, forming a receiving cavity between the first hook lock and the second hook lock, and the capsule being disposed within the receiving cavity; wherein, during the first inflation of the gas storage tank, the hook-lock assembly stretches and compresses the receiving cavity.

[0009] Furthermore, the first hook lock includes a first connecting wall and a first extrusion wall connected opposite to each other, the second hook lock includes a second connecting wall and a second extrusion wall connected opposite to each other, the second extrusion wall is slidably connected between the first connecting wall and the first extrusion wall, the receiving cavity is disposed between the first extrusion wall and the second extrusion wall, and the first connecting wall and the second connecting wall respectively connect two adjacent segments.

[0010] Furthermore, both the first extrusion wall and the second extrusion wall are provided with a plurality of clearance holes, which are used to allow the expanding 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 sealing rubber; the plurality of second connecting plates are connected to the sealing frames and are used to connect two adjacent segments; the sealing rubber is stretchably connected between the two sealing frames.

[0012] Furthermore, the sealing rubber is wrinkled. When the gas storage tank is not filled with gas, the sealing rubber is folded. When the gas storage tank is filled with gas for the first time, as the gas pressure gradually increases during filling, the sealing rubber gradually unfolds.

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

[0014] On the other hand, a construction method for a composite lining structure for a gas storage facility is provided, including: Install the tunnel segments on the outside of the compressed energy storage cavern; The first hook is attached to the tube segment, and the second hook is attached to another adjacent tube segment; Place the capsule inside the receiving cavity; The hydraulically driven segment installation machine drives 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 fitted onto the outside of the hook-lock assembly and connected to two adjacent segments respectively; Multiple segments, hook-lock assembly, and sealing assembly are installed sequentially. The sealing layer is placed on the outside of the compressed energy storage cavern; A flexible concrete layer is disposed between the sealing layer and the plurality of the segments; When the gas storage tank is first filled with gas, and the pressure exerted on the capsule by the hook-lock assembly is greater than the rupture pressure of the capsule, the expansion material inside the capsule expands and fills the sealing assembly. Stop filling the gas storage tank after the expansion material has solidified.

[0015] This invention provides a composite lining structure and construction method for a gas storage facility. The composite lining structure is applied to the outside of a compressed energy storage cavern and includes: multiple tube segments, a sealing layer, a hook-and-lock assembly, a sealing assembly, and a capsule. The multiple tube segments are arranged end-to-end and surround the outside of the compressed energy storage cavern. The sealing layer is disposed between the compressed energy storage cavern and the multiple tube segments. The hook-and-lock assembly is stretchably disposed between two adjacent tube segments, with each end of the hook-and-lock assembly connected to one of the two adjacent tube segments. The sealing assembly is sleeved on the outside of the hook-and-lock assembly, with each end of the sealing assembly connected to one of the two adjacent tube segments. The capsule is housed within the hook-lock assembly and filled with expansion material. During the initial inflation of the gas storage tank, as inflation progresses, the gas storage pressure gradually increases. The composite lining structure moves away from the compressed energy storage tunnel, the gap between adjacent 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 exceeds the capsule's rupture pressure, causing the capsule to rupture. The expansion material inside the capsule expands and fills the sealing assembly. The preset pressure exceeds the maximum gas storage pressure designed for the gas storage tank. This invention utilizes multiple tubular segments arranged end-to-end around the outside of a compressed energy storage cavern. By placing a sealing layer between the cavern and the tubular segments, the compressed energy storage cavern can be effectively sealed. Furthermore, each end of the sealing assembly connects to two adjacent tubular segments, effectively enclosing a hook-and-lock assembly between them. Because the hook-and-lock assembly contains a capsule filled with expanding material, during the initial inflation of the storage cavern, as the inflation progresses, the storage pressure gradually increases. The surrounding rock and the tubular segments move away from the compressed energy storage cavern, gradually increasing the gaps between adjacent segments. This causes the hook-and-lock assembly to stretch, and the pressure exerted on the capsule by the hook-and-lock assembly gradually increases. When the storage pressure reaches a preset pressure, the pressure exerted on the capsule by the hook-and-lock assembly exceeds the pressure of the capsule. The rupture pressure of the capsule causes it to rupture, and the expansion material inside the capsule expands and fills the sealing components. Because the initial inflation pressure of the gas storage tank reaches the preset pressure, which is greater than the maximum gas storage pressure designed for the gas storage tank, multiple segments are fully squeezed open and moved to their limit positions. At this point, after the expansion material solidifies, the entire composite lining structure is formed. Subsequently, the gas storage tank is vented, and the gas storage pressure is reduced to the design operating pressure. The design operating pressure is less than the maximum gas storage pressure of the gas storage tank. At this time, in the circumferential direction of the composite lining structure, multiple segments and the hook-locking components squeezed by the expansion material are always in a state of mutual compression. That is, the entire composite lining structure is not subjected to tensile stress in the circumferential direction, thus solving the problem that the lining will crack due to large tensile stress, resulting in poor sealing performance of the gas storage tank. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0018] Explanation of the markings in the image: 1. Compressed energy storage caverns; 2. Segment; 21. First connecting plate; 211. First connecting part; 212. Second connecting part; 3. Sealing layer; 4. Hook and lock assembly; 41. First hook and lock; 411. First connecting wall; 412. First pressing wall; 42. Second hook and lock; 421. Second connecting wall; 422. Second pressing wall; 43. Receiving cavity; 44. Stiffening rib; 45. Third connecting part; 46. Clearance hole; 5. Sealing assembly; 51. Sealing frame; 52. Second connecting plate; 53. Sealing rubber; 521. Fourth connecting part; 6. Capsules; 7. Flexible concrete layer; 8. Composite lining structure; 9. Surrounding rock. 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, not all, of the embodiments of the present invention. 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] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections 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 invention. As used in this specification and the 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 also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] Combination Figure 1-12As shown, the present invention provides a composite lining structure 8 for a gas storage facility, applied to the outside of a compressed energy storage cavern 1, comprising: multiple segments 2, a sealing layer 3, a hook-and-lock assembly 4, a sealing assembly 5, and a capsule 6. The multiple segments 2 are arranged end-to-end and surround the outside of the compressed energy storage cavern 1; the sealing layer 3 is disposed between the compressed energy storage cavern 1 and the multiple segments 2; the hook-and-lock assembly 4 is stretchably disposed between two adjacent segments 2, and both ends of the hook-and-lock assembly 4 are respectively connected to two adjacent segments 2; the sealing assembly 5 is sleeved on the outside of the hook-and-lock assembly 4, and both ends of the sealing assembly 5 are respectively connected to two adjacent segments 2; the capsule 6 is disposed within the hook-and-lock assembly. Inside component 4, and inside capsule 6, there is an expansion material; during the first inflation of the gas storage tank, as inflation proceeds, the gas storage pressure gradually increases, the composite lining structure 8 moves away from the compressed 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 capsule 6 gradually increases. When the gas storage pressure reaches the preset pressure, the pressure exerted by the hook-lock assembly 4 on capsule 6 is greater than the rupture pressure of capsule 6, capsule 6 ruptures, the expansion material inside capsule 6 expands and fills the sealing component 5, and the preset pressure is greater than the maximum gas storage pressure designed for the gas storage tank.

[0024] It is understood that the gas storage facility includes a compressed energy storage cavern 1, a composite lining structure 8, and surrounding rock 9 located outside the composite lining structure 8. Compared to the existing ordinary monolithically cast concrete lining, this embodiment of the invention uses multiple segments 2 arranged end to end and surrounding the outside of the compressed energy storage cavern 1. By placing a sealing layer 3 between the compressed energy storage cavern 1 and the multiple segments 2, the compressed energy storage cavern 1 can be effectively sealed. Moreover, the two ends of the sealing component 5 are respectively connected to two adjacent segments 2, that is, the sealing component 5 wraps the hook-lock component 4 between two adjacent segments 2. Because the hook-lock component 4 is equipped with a capsule 6 filled with expansion material, during the first inflation of the gas storage facility, as inflation proceeds, the gas storage pressure gradually increases, and the surrounding rock 9 and the multiple segments 2 all move away from the compressed energy storage cavern 1. As the gas moves in the direction of the movement, 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, which is the critical pressure at which the pressure exerted by the hook-lock assembly 4 on the capsule 6 can 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, and the capsule 6 ruptures. The expansion material inside the capsule 6 expands and fills the sealing assembly 5. Since the preset pressure is greater than the maximum gas storage pressure designed, multiple segments 2 are fully squeezed apart and moved to their limit positions. At this point, after the expansion material solidifies, the entire composite lining structure 8 is formed. Then, the gas storage tank is vented, and the gas storage pressure is reduced to the design operating pressure, which is less than the maximum gas storage pressure of the gas storage tank.

[0025] After the entire composite lining structure 8 is formed, during the subsequent gas release and filling cycles, the pressure inside the gas storage tank can never exceed the maximum gas storage pressure. Since the composite lining structure 8 is applied to the outside of the compressed energy storage cavern 1, the entire composite lining structure 8 has a tendency to shrink. In the circumferential direction of the composite lining structure 8, multiple segments 2 and the hook-lock assembly 4 stretched to the limit position are always in a state of mutual compression. That is, the entire composite lining structure 8 is not subjected to tensile stress in the circumferential direction, thus solving the problem that the lining will crack due to large tensile stress, resulting in poor sealing performance of the gas storage tank.

[0026] Specifically, capsule 6 is separated from water by a membrane. The solid material is thoroughly mixed before being placed inside the capsule. Upon capsule rupture, the pressure of the hook-and-lock structure ensures the solid material and water in the expanding material react evenly. The expanding filler is expansive concrete designed according to the standard GB / T 23439-2017 "Concrete Expansive Agent," achieving the designed volume expansion rate, i.e., completely filling the entire sealing component 5. In a practical application scenario, the expanding material is expansive concrete with the following material composition: 45% special calcium silicate cement; 15% ultrafine silica fume; 20% ettringite expanding agent, increasing the volume of the expanding filler by approximately 200%; 8% active magnesium oxide to provide a delayed expansion effect; 3% nano-silica; 1.5% high-efficiency water-reducing agent; 0.5% quick-setting agent; and 7% hydrophilic expanding resin to provide additional expansion capacity. The amount of water is designed according to the strength requirements of the expanding filler in the actual project.

[0027] For example, in a practical application scenario, the gas storage facility is designed with a maximum gas storage pressure P. s The pressure is set at 15 MPa. To ensure that the gas storage tank segment 2 is fully opened, the preset pressure P is used. max =20MPa. According to finite element software calculations, the pressure that capsule 6 inside hook-lock assembly 4 can withstand when the internal pressure is 20MPa is 23MPa, and the rupture pressure threshold of capsule 6 is 23MPa±1MPa. Among them, the preset pressure P max The initial inflation pressure of the gas storage tank is the pressure exerted by the hook-lock assembly 4 on the capsule 6 when the internal pressure is 20 MPa. When this pressure reaches the rupture pressure of the capsule 6, the capsule 6 ruptures, and the expansion material inside 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 precisely the critical pressure at which the capsule 6 ruptures, determined based on numerical simulation methods according to the actual project conditions.

[0028] In a practical application scenario, the steel plate used for the hook lock assembly 4 is Q345 steel, which meets the tensile strength requirement when the safety factor is 2. The safety factor of 2 means that 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 100mm. The hook lock assembly 4 is provided with multiple stiffening ribs 44, the thickness of the stiffening ribs 44 is 30mm, and the thickness of the steel plate at the location of the stiffening ribs 44 is 120mm to ensure sufficient rigidity.

[0029] In a practical application scenario, the capsule 6 has a wall thickness of 0.3mm ± 0.02mm, is made of biodegradable polylactic acid, and has 2% nano-silica added to improve its strength.

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

[0031] In this embodiment, flexible concrete is concrete incorporating reinforcing materials such as steel fibers and polypropylene fibers. Its flexibility can reach 100-400 times that of ordinary concrete. It can withstand large bending deformation without breaking, forming micro-cracks rather than brittle failure. Its ultimate elongation exceeds 3%, while that of ordinary concrete is about 0.01%. Its tensile strength is 3 to 5 times higher than that of ordinary concrete. The flexible concrete layer 7 has strong deformation capacity. The flexible concrete layer 7 is placed between the sealing layer 3 and multiple pipe segments 2, which can enhance the deformation coordination ability of the sealing layer 3, prevent gaps between pipe segments 2, and thus prevent stress concentration at the cracks of pipe segments 2 and the joints of adjacent pipe segments 2, thereby preventing the sealing layer 3 from being torn.

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

[0033] In this embodiment, the first connecting part 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 segment 2 when the hook-lock assembly 4 is stretched and the segment 2 moves away from the compressed energy storage cavern 1. The second connecting part 212 is used to connect the sealing assembly 5, which helps to ensure the sealing performance of the sealing assembly 5. Moreover, after the expansion material expands and fills the entire sealing assembly 5, it ensures that there will be no gaps between the sealing assembly 5 and the 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 set on the plate surface facing the first connecting plate 21, and the second connecting member is set on the end face 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, which are slidably connected together, forming a receiving cavity 43 between the first hook lock 41 and the second hook lock 42, and the capsule 6 is disposed in the receiving cavity 43; wherein, when the gas storage tank is first inflated, the hook-lock assembly 4 stretches and compresses the receiving cavity 43.

[0036] In this embodiment, the first hook lock 41 and the second hook lock 42 are slidable. When the gas storage tank is not filled with gas, the first hook lock 41 and the second hook lock 42 form a receiving cavity 43, which provides a place for the capsule 6. When the gas storage tank is filled with gas for the first time, the hook lock assembly 4 stretches and squeezes the receiving cavity 43, so that the internal space of the receiving cavity 43 gradually shrinks, 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 inside 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 pressing wall 412 connected to each other, and the second hook lock 42 includes a second connecting wall 421 and a second pressing wall 422 connected to each other. The second pressing wall 422 is slidably connected between the first connecting wall 411 and the first pressing wall 412. The receiving cavity 43 is disposed between the first pressing wall 412 and the second pressing wall 422. The first connecting wall 411 and the second connecting wall 421 are respectively connected to two adjacent tube 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 are slidable. The receiving cavity 43 is disposed between the first extrusion wall 412 and the second extrusion wall 422. When the gas storage tank is first filled with gas, since the first connecting wall 411 and the second connecting wall 421 are respectively connected to two adjacent tube segments 2, as the filling progresses, the gas storage pressure gradually increases. The surrounding rock 9 and multiple tube segments 2 move away from the compressed energy storage cavern 1, and the gap between adjacent tube segments 2 gradually increases. The adjacent tube 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 towards the first connecting wall 411, thereby causing the internal space of the receiving cavity 43 to gradually shrink and squeeze the capsule 6. When the gas storage pressure reaches the preset pressure, the pressure of 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 inside the capsule 6 expands and fills the sealing assembly 5.

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

[0040] Specifically, both the first connecting wall 411 and the second connecting wall 421 are provided with a plurality of third connecting parts 45, which are connected to the first connecting part 211.

[0041] In this embodiment, the third connecting part 45 connects to the first connecting part 211, ensuring the stability of the connection between the hook lock assembly 4 and the tube segment 2. Specifically, the third connecting part 45 is disposed on the outer side plate surface of the first hook lock 41 and the second hook lock 42, and the third connecting part 45 and the hook lock assembly 4 are integrally formed, facilitating processing and production. More specifically, both the third connecting part 45 and the first connecting part 211 have bolt holes, and are connected together by bolts, making the connection between the hook lock assembly 4 and the tube segment 2 stable.

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

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

[0044] In a practical application scenario, the hook-lock assembly 4 has approximately 5mm clearance holes 46 on its surface to ensure that the expansive concrete material can quickly fill the internal space of the connection and solidify with sufficient strength in a short period of time, thereby forming a permanent support structure.

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

[0046] In this embodiment, the connection of the sealing frame 51, multiple second connecting plates 52, and sealing rubber 53 ensures that the sealing assembly 5 wraps the hook-lock assembly 4 between two adjacent pipe segments 2. The second connecting plates 52 connect two adjacent pipe segments 2, making the connection between the sealing assembly 5 and the pipe segments 2 stable and preventing gaps between the sealing assembly 5 and the pipe segments 2. The sealing rubber 53 is stretched between the two sealing frames 51. When the gas storage tank is filled with gas, the sealing rubber 53 stretches with the movement of the pipe segments 2, thereby providing expansion space for the expansion material and ensuring the full expansion of the entire composite lining structure 8. After the expansion material solidifies, the entire composite lining structure 8 is formed.

[0047] Specifically, the second connecting plate 52 is provided with a plurality of fourth connecting parts 521, which are connected to the second connecting parts 212.

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

[0049] In some embodiments, the sealing rubber 53 is pleated. When the gas storage tank is not filled with gas, the sealing rubber 53 is folded. When the gas storage tank is filled with gas for the first time, as the gas storage pressure gradually increases, the sealing rubber 53 gradually unfolds.

[0050] In this embodiment, the sealing rubber 53 is wrinkled, which helps the sealing component to stretch. As inflation proceeds, the gas storage pressure gradually increases, and the sealing rubber 53 gradually unfolds, 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 plates as sealing materials, polyurea is a high-molecular synthetic material. Using polyurea as the sealing layer 3 can significantly reduce construction costs. Moreover, the tensile deformation capacity and anti-aging capacity of the polyurea sealing layer are stronger than those of the steel lining, and the cost is low.

[0053] The present invention also provides a construction method for a composite lining structure 8 for a gas storage facility, comprising steps S10 to S100: S10. Install segment 2 on the outside of the compressed energy storage cavern 1; S20. Connect the first hook lock 41 to the pipe segment 2, and connect the second hook lock 42 to another adjacent pipe segment 2; S30. Place capsule 6 into receiving cavity 43; S40. The hydraulically driven segment 2 installation machine drives two adjacent segments 2 to move towards each other until the first hook lock 41 and the second hook lock 42 are closed and connected. S50. The sealing assembly 5 is fitted onto the outside of the hook-lock assembly 4 and connected to two adjacent segments 2 respectively. S60. Install multiple segments 2, hook-lock assembly 4 and sealing assembly 5 in sequence; S70. Set the sealing layer 3 on the outside of the compressed energy storage cavern 1; S80. The flexible concrete layer 7 is placed between the sealing layer 3 and the multiple segments 2; S90. The gas storage tank is filled with gas for the first time. When the pressure exerted on the capsule 6 by the hook-lock assembly 4 is greater than the rupture pressure of the capsule 6, the expansion material inside the capsule 6 expands and fills the sealing assembly 5. S100. Stop filling the gas storage tank with gas after the expansion material has solidified.

[0054] In this embodiment of the invention, the gas storage facility includes a compressed energy storage cavern 1, a composite lining structure 8, and surrounding rock 9 disposed outside the composite lining structure 8. Compared to existing conventional monolithically cast concrete linings, this embodiment uses multiple segments 2 arranged end-to-end and surrounding the outside of the compressed energy storage cavern 1. By placing a sealing layer 3 between the compressed energy storage cavern 1 and the multiple segments 2, the compressed energy storage cavern 1 can be effectively sealed. Furthermore, the two ends of the sealing component 5 are respectively connected to two adjacent segments 2, meaning the sealing component 5 encloses the hook-lock component 4 between two adjacent segments 2. Because the hook-lock component 4 contains a capsule 6 filled with expansion material, during the first inflation of the gas storage facility, as inflation progresses, the gas pressure gradually increases, and the surrounding rock 9 and the multiple segments 2 move away from the compressed energy storage cavern 1. The gaps between adjacent segments 2 gradually increase, and the hook-lock component 4 gradually stretches. The pressure exerted on the capsule 6 by the hook-lock assembly 4 gradually increases. 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 inside the capsule 6 expands and fills the sealing assembly 5. Since the preset pressure is greater than the maximum gas storage pressure, multiple segments 2 are fully squeezed apart and moved to their limit positions. At this point, after the expansion material solidifies, the entire composite lining structure 8 is formed. Then, the gas storage tank is vented, and the gas storage pressure is reduced to the design operating pressure. The design operating pressure is less than the maximum gas storage pressure of the gas storage tank. In the circumferential direction of the composite lining structure 8, multiple segments 2 and the hook-lock assembly 4 stretched to the limit position are always in a state of mutual compression. That is, the entire composite lining structure 8 is not subjected to tensile stress in the circumferential direction, thus solving the problem that the lining will crack due to large tensile stress, resulting in poor sealing performance of the gas storage tank.

[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 these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A composite lining structure for a gas storage facility, applied to the outside of a compressed energy storage cavern, characterized in that, include: Multiple tube segments, which are arranged end to end and surround the outside of the compressed energy storage cavern; A sealing layer is disposed between the compressed energy storage cavern and the plurality of the tube segments; A hook-lock assembly, which is stretchably disposed between two adjacent segments, and whose two ends are respectively connected to the two adjacent segments; A sealing assembly, which is sleeved on the outside of the hook-lock assembly, and whose two ends are respectively connected to two adjacent segments; A capsule, wherein the capsule is disposed within the hook-and-lock assembly and the capsule is filled with an expanding material; During the initial inflation of the gas storage tank, as inflation progresses, the gas storage pressure gradually increases, the composite lining structure moves away from the compressed energy storage cavern, the gap between adjacent 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 exceeds the rupture pressure of the capsule, causing the capsule to rupture. The expansion material inside the capsule expands and fills the sealing assembly. The preset pressure is greater than the maximum gas storage pressure designed for the gas storage tank.

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

3. The composite lining structure for a gas storage facility according to claim 1, characterized in that, Both ends of the tube 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 to the hook lock assembly, and the second connecting parts are used to connect to the sealing assembly.

4. The composite lining structure for a gas storage facility according to claim 1, characterized in that, The hook-and-lock assembly includes: A first hook lock and a second hook lock are slidably connected together, forming a receiving cavity between the first hook lock and the second hook lock, and the capsule is disposed in the receiving cavity; During the first inflation of the gas storage tank, the hook-lock assembly stretches and compresses the receiving 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 connected opposite to each other, and the second hook lock includes a second connecting wall and a second extrusion wall connected opposite to each other. The second extrusion wall is slidably connected between the first connecting wall and the first extrusion wall. The receiving cavity is disposed between the first extrusion wall and the second extrusion wall. The first connecting wall and the second connecting wall are respectively connected to two adjacent segments.

6. The composite lining structure for a gas storage facility according to claim 5, characterized in that, Both the first extrusion wall and the second extrusion wall are provided with a plurality of clearance holes, which are used to allow the expanding 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 includes: Two opposing sealed frames; Multiple second connecting plates are connected to the sealing frame and are used to connect two adjacent segments; A sealing rubber, which 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 wrinkled. When the gas storage tank is not filled with gas, the sealing rubber is folded. When the gas storage tank is filled with gas for the first time, as the gas pressure gradually increases, 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 used in a gas storage facility, characterized in that, include: Install the tunnel segments on the outside of the compressed energy storage cavern; The first hook is attached to the tube segment, and the second hook is attached to another adjacent tube segment; Place the capsule inside the receiving cavity; The hydraulically driven segment installation machine drives 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 fitted onto the outside of the hook-lock assembly and connected to two adjacent segments respectively; Multiple segments, hook-lock assembly, and sealing assembly are installed sequentially. The sealing layer is placed on the outside of the compressed energy storage cavern; A flexible concrete layer is disposed between the sealing layer and the plurality of the segments; When the gas storage tank is first filled with gas, and the pressure exerted on the capsule by the hook-lock assembly is greater than the rupture pressure of the capsule, the expansion material inside the capsule expands and fills the sealing assembly. Stop filling the gas storage tank after the expansion material has solidified.

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