Sealing structure of compressed gas storage

Abstract

The present application relates to compressed air energy storage technology field, specifically to a kind of compressed air storage sealing structure.The present application is at least one arching configuration is arranged in the steel lining ring direction, sufficient ring tensile deformation space is reserved to steel lining by arching mode, to adapt to the deformation of the outer expansion of surrounding rock due to internal pressure.In arching configuration, it is divided into inner arch and outer arch, inner arch and outer arch are oppositely arranged, and it is bulging as a whole, inner arch and outer arch can produce tensile deformation under the action of ring tensile stress on both sides of steel lining, and absorb pressure energy;By setting arching filling layer between the two inner concave surfaces of two opposite sides, local stress concentration can be prevented when the two arching parts (i.e.inner arch and outer arch) contact due to deformation incoordination.Under the condition that sealing structure is individually subjected to external water pressure after pressure relief, the bulging curved surface characteristics of arching configuration can be used to disperse external water pressure and reduce the risk of structural instability due to external pressure.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, and in particular to a sealing structure for a compressed air storage tank. Background Technology

[0002] Compressed air energy storage technology is a novel energy storage method that utilizes high-pressure air to store energy. Its working principle involves using excess energy from the grid during off-peak hours to drive a compressor to compress air and store it in a storage device. During peak hours, the high-pressure air is released to drive an expander, converting the stored energy into electrical energy. This technology primarily uses underground artificial caverns as storage tanks, which are a crucial component of compressed air energy storage power plants.

[0003] The structure of a compressed air energy storage artificial chamber mainly consists of surrounding rock, lining, and sealing layer. The storage pressure of the gas storage is generally around 7MPa to 15MPa. Considering economic efficiency, the mainstream design concept for gas storage structures is to use the surrounding rock as the main body to bear the internal air pressure. The lining is responsible for evenly transferring the gas pressure inside the storage chamber to the surrounding rock, dispersing deformation, and providing a smooth support surface for the sealing layer. The sealing layer uses a thin steel lining, whose main function is sealing, bearing only a small portion of the internal pressure. To allow the sealing layer to slide well, a sliding layer is usually set between the sealing layer and the concrete lining, instead of anchoring the two.

[0004] In existing technologies, flat steel plates are commonly used as sealing layers, but this may be clearly unsuitable under certain conditions. Firstly, during the process of the surrounding rock bearing internal pressure, continuous outward deformation occurs, requiring the sealing layer and lining layer to also deform to coordinate with the surrounding rock's deformation. If the deformation required for the sealing layer material to transmit internal forces exceeds its own deformation capacity, the sealing layer material will fail. Specifically, in strata with weak engineering geological conditions, the stress and strain generated by coordinating deformation in thin steel-lined sealing layers may exceed the material's allowable values, leading to sealing layer failure. Secondly, during the operation and circulation of the gas storage facility, the lining concrete will inevitably develop tensile cracks under high internal pressure, and groundwater will act on the outside of the sealing layer through these cracks. When the gas storage facility is under maintenance and internal air is discharged, if the groundwater head directly acting on the sealing layer is too high, it can cause excessive stress on the sealing material, leading to damage or buckling at the top. To avoid damage to the thin steel lining under external water pressure, the current practice is to dewater the gas storage facility, but this significantly increases the construction cost of the compressed air energy storage cavern.

[0005] Therefore, it is necessary to design a type of sealed structure for compressed gas storage that can adapt to local deformation and pressure, which can both transfer the internal pressure to the surrounding rock bearing capacity by generating a certain deformation, and resist external water pressure at the same time. Summary of the Invention

[0006] The purpose of this invention is to address the problem that the thin steel lining sealing layer in the prior art has insufficient compressive strength and needs to improve its deformation capacity to coordinate internal and external pressures, by providing a sealing structure for a compressed gas storage tank.

[0007] This invention provides a sealing structure for a compressed gas storage tank, comprising a steel lining, the steel lining including at least one arched structure for accommodating circumferential deformation; the arched structure includes an inner arch and an outer arch, the inner arch and the outer arch being arranged opposite to each other and the outer arch being positioned relative to the side of the inner arch closer to the concrete lining layer, the inner surfaces of the inner arch and the outer arch being concave and the outer surfaces being convex, and an arched filling layer being provided between the inner arch and the outer arch.

[0008] This scheme utilizes at least one arching structure upwards from the steel liner ring to provide sufficient circumferential tensile deformation space for the steel liner, accommodating the outward expansion deformation of the surrounding rock caused by internal pressure. The arching structure consists of an inner arch and an outer arch, positioned opposite each other. The inner sides of the opposing inner and outer arches are designed as concave surfaces, while the outer sides are designed as convex surfaces, forming an overall bulge shape. Under the circumferential tensile stress of the steel liner on both sides, the inner and outer arches can undergo overall tensile deformation, absorbing pressure energy. By placing an arching filling layer between the two concave surfaces on opposite sides, local stress concentration due to deformation incoordination when the two arched parts (inner and outer arches) come into contact can be prevented. By using the arching structure upwards from the steel liner ring, even when the sealed structure is subjected to external water pressure alone after depressurization, the bulging curved surface characteristics of the arching structure can disperse the water pressure. Compared to flat steel plates, the arching structure has stronger bending resistance and better compressive strength, which helps reduce the risk of structural instability due to external pressure.

[0009] Preferably, the above-mentioned compressed gas storage sealing structure further includes a concrete lining layer. The concrete lining layer is recessed at the location corresponding to the arching structure to match the installation of the arching structure. Cracks are pre-set at the recessed location of the concrete lining layer and a steel plate protective layer is provided. The steel plate protective layer is anchored to the concrete lining layer by a plurality of first anchors. Both ends of the steel plate protective layer extend to the steel lining on both sides of the arching structure. This solution is applicable to a circumferentially integrally formed monolithic concrete lining structure.

[0010] The integral concrete lining layer under internal pressure exhibits circumferential tension and radial compression. Under this stress state, the inner surface of the concrete lining layer is prone to localized spalling due to excessive compressive stress. By pre-setting cracks at the corresponding arching structure locations in the concrete lining layer—that is, by connecting the cracks to the concave side of the concrete lining layer—the tensile cracks generated during deformation of the concrete lining layer can be concentrated at the concave locations, ensuring that concrete fragments falling from the cracks occur primarily at these locations. Furthermore, a steel plate protective layer is installed between the cracks and the arching structure for isolation, preventing lining fragments from affecting the deformation of the arching structure. In addition, utilizing the curved surface characteristics of the bulge structure can increase the overall resistance of the steel lining to external water pressure, forming a structure of "steel plate protective layer + arching structure + arching filling layer" that disperses and resists external water pressure.

[0011] Preferably, the pre-designed cracks extend from the surrounding rock side to the interior of the cavern, and the cracks are filled with a sealant to prevent debris from falling in or moisture from seeping in, thus ensuring structural safety and durability. The sealant used for filling the cracks should be elastic or adjustable to accommodate minor structural movements and prevent the cracks from widening.

[0012] Preferably, the filler is asphalt-impregnated hemp fiber, which has waterproof, anti-corrosion, and elastic cushioning properties. Alternatively, new materials such as caulking compound and weather-resistant sealant can be used to replace asphalt-impregnated hemp fiber as the filler.

[0013] More preferably, an elastic buffer layer is provided at the bottom of the steel plate protective layer. The elastic buffer layer can avoid direct rigid contact between the outer arch and the steel plate protective layer, reducing the deformation of the outer arch structure. In addition, under the depressurization state of the cavern, the arching structure gradually retracts and the outer arch arches upward. At this time, the elastic buffer layer can absorb the compressive force of the outer arch and undergo compressive deformation, and then transfer the internal stress to the concrete lining layer, providing a certain support force. This support force can also resist the external water pressure and slow down the deformation of the concrete lining layer. Under the pressure of the cavern, the two ends of the arching structure are under tension, the outer arch gradually flattens, and the distance between the outer arch and the concrete lining layer becomes larger and larger. At this time, the rebound deformation force of the elastic buffer layer can be used to refill the gap between the concrete lining layer and the arching structure, reducing the internal pressure on the concave position of the concrete lining layer, reducing the cracking of the concrete lining layer, and better adapting to the deformation of the concrete lining layer and the steel lining.

[0014] Preferably, as another possible implementation, the concrete lining layer can be divided into circumferential blocks, and a V-shaped steel plate can be installed between two adjacent blocks. The larger opening end of the V-shaped steel plate faces the surrounding rock side. The two sides of the V-shaped steel plate are anchored to the corresponding blocks of the lining by a number of second anchors. A number of steel teeth are provided on the opposite sides of the V-shaped steel plate. The steel teeth on both sides are corresponding and in contact with each other. A filling material is provided between the upper and lower steel teeth. The filling material is used to block water.

[0015] By using V-shaped steel plates to provide circumferential deformation for the concrete lining layer, the risk of cracking and spalling is reduced. When the V-shaped steel plates are open, their structure and internal filling material prevent external water infiltration. In the depressurized state, the V-shaped steel plates are closed and compressed, with the steel teeth on opposite sides contacting each other. At this point, the filling material and the contacting steel teeth can withstand the circumferential pressure, closing the crack channels between adjacent lining sections and blocking water seepage. The concrete lining layer resists external water pressure, preventing buckling failure of the sealing layer under high water head. This solution allows the concrete lining layer to adapt to cavern deformation and effectively resists external water pressure, preventing direct impact of external water on the sealing layer (steel lining). This solution eliminates the need for a drainage system, thus saving costs.

[0016] Furthermore, it is preferable to position the V-shaped steel plate corresponding to the arching structure, which facilitates better coordinated deformation of the concrete lining layer and the steel lining, and provides better adaptability to the expansion and contraction deformation of the arching structure.

[0017] Preferably, both the inner and outer arches are made of zigzag steel plates, or both the inner and outer arches are made of arc-shaped steel plates.

[0018] Preferably, the arching filler layer has openings to increase its deformation capacity.

[0019] Preferably, the arching filler layer can be made of elastic materials such as polyurethane, silicone rubber, nitrile rubber, EPDM rubber, or butyl rubber.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a sealing structure for a compressed gas storage tank. By setting an upward bulge (arching) deformation design on the steel liner ring, it is used to resist the internal air pressure and the external water pressure respectively, realizing "resisting pressure with deformation". This can enhance the structural adaptability and pressure bearing capacity, and extend the service life of the gas storage tank. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the sealing structure of a compressed gas storage tank in Example 1. Figure 1 ; Figure 2 This is a schematic diagram of the sealing structure of a compressed gas storage tank in Example 1. Figure 2 ; Figure 3 This is a schematic diagram of the sealing structure of a compressed gas storage tank in Example 1. Figure 3 ; Figure 4 This is a schematic diagram of the sealing structure of a compressed gas storage tank in Example 1. Figure 4 ; Figure 5This is a schematic diagram of a compressed gas storage sealing structure in Example 3.

[0022] Markings in the diagram: 1-Concrete lining layer; 11-Segmented lining; 12-V-shaped steel plate; 13-Steel teeth; 14-Filling material; 15-Second anchor; 2-Steel lining; 3-Inner arch; 4-Outer arch; 5-Arching filling layer; 51-Opening; 6-Steel plate protective layer; 7-First anchor; 8-Elastic buffer layer; 9-Crack. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0024] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0026] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0027] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0028] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0029] Example like Figures 1-4 As shown, a compressed gas storage sealing structure includes a steel lining 2, which includes an arc-shaped steel plate and at least one arching structure. The arc-shaped steel plate and the arching structure are circumferentially connected. The arching structure includes an inner arch 3 and an outer arch 4, which are arranged opposite to each other, with the outer arch 4 positioned relative to the inner arch 3 on the side closer to the concrete lining layer 1. The inner surfaces of the inner arch 3 and the outer arch 4 are both concave, and the outer surfaces are both convex. An arching filling layer 5 is provided between the inner arch 3 and the outer arch 4.

[0030] In existing technologies, compressed air energy storage caverns are typically several meters or even more than ten meters in diameter and hundreds of meters in length. However, the working space in underground caverns is limited. In addition, production technology and transportation restrictions mean that the steel lining (sealing layer) is usually made by splicing and welding multiple steel plates on site in the circumferential (circumferential direction) and axial (length direction) directions to form a cylindrical shape.

[0031] This scheme provides at least one arched structure in the circumferential direction of the steel liner 2, which is connected to the arc-shaped steel plate in the circumferential direction to form an integral whole. The arching method can provide the steel liner 2 with sufficient space for circumferential tensile deformation to adapt to the outward expansion deformation of the surrounding rock caused by internal pressure.

[0032] As one possible implementation, at least two arching structures can be provided along the circumferential direction of the steel lining 2. Each arching structure is provided at intervals along the circumferential direction of the steel lining 2. An arc-shaped steel plate can be provided between two adjacent arching structures, or two or more can be provided between them. The two ends of the inner arch 3 and the outer arch 4 of the arching structure are integrally connected to the arc-shaped steel plate on the corresponding side.

[0033] As another possible implementation, at least two arching structures can be connected sequentially along the circumferential direction, such as... Figure 2As shown, it can be one or more curved steel plates connected every two arched structures, or one or more curved steel plates connected every three arched structures, or multiple arched structures and multiple curved steel plates connected in sequence to form a ring, without being limited to the examples above.

[0034] In the arched structure of this scheme, there are inner arches 3 and outer arches 4, which are arranged opposite to each other. The two sides (i.e., the inner sides) of the inner arches 3 and 4 are set as concave surfaces, and the outer sides are set as convex surfaces, forming an overall bulge shape. Under the circumferential tensile stress of the steel linings 2 on both sides, the inner arches 3 and 4 can undergo tensile deformation as a whole, absorbing pressure energy. By setting an arched filling layer 5 between the two concave surfaces on the two opposite sides, local stress concentration due to deformation incoordination can be prevented when the two arched parts (i.e., inner arches 3 and outer arches 4) come into contact. By setting the arched structure upward on the steel lining ring, the external water pressure can be dispersed by utilizing the bulge curved surface characteristics of the arched structure when the sealed steel lining is subjected to external water pressure alone after depressurization. Compared with flat steel plates, the arched structure has strong bending resistance and good compressive strength, which helps to reduce the risk of structural instability due to external pressure.

[0035] In this embodiment, both the inner arch 3 and the outer arch 4 are preferably made of steel sheets. The concave surfaces of the two steel sheets interlock, and the inner arch 3 and outer arch 4 are symmetrically arranged. Their thickness is preferably half the thickness of the steel lining 2, and their shape is preferably arched or approximately arched. The arching method provides sufficient space for circumferential tensile deformation of the steel lining 2. The two ends of each steel sheet are welded to the end faces of the steel lining 2, and are smoothly connected to the inner and outer surfaces of the steel lining 2. This can effectively transfer stress, resist internal and external pressure, better adapt to the circumferential deformation of the cavern, and ensure uniform deformation of the arched structure.

[0036] During use, as the internal pressure increases, the inner arch 3 and the outer arch 4 press against each other to deform the arching filling layer 5, causing the arching structure to gradually flatten. A gap will be generated between the outer arch 4 and the outer concrete lining layer 1, reducing the internal stress of the lining concrete corresponding to the arching structure due to the internal air pressure.

[0037] After being subjected to internal air pressure, the annular steel lining 2 transfers the load by expanding outward. The arching structure causes the steel lining 2 to undergo large circumferential deformation by compressing the arching filling layer 5. The arching filling layer 5 should have large elastic deformation under pressure, and a material with strong elasticity is preferred. When filling the entire cross-section, a material with a small elastic modulus (elastic reaction force) should be selected. Alternatively, a material with a large elastic modulus (elastic reaction force) can be selected and local openings 51 can be made to increase its deformation capacity.

[0038] As an optional implementation, the cross-section of the arched structure can be as follows: Figure 1The side view shown resembles two interlocking butterfly springs, with both the inner and outer arches composed of three straight segments. The small arch absorbs less deformation but also reduces the weakening of the concrete cross-section. The arching infill layer 5 uses full-section filling, and materials with low elastic modulus (elastic reaction force) (such as polyurethane, silicone rubber, nitrile rubber, etc.) should be selected.

[0039] As an alternative implementation, the cross-section of the arched structure can also be as follows: Figure 3 The structure shown resembles two interlocking corrugated steel bars, with both the inner and outer arches formed by curves. It exhibits significant deformation capacity but also greatly weakens the concrete cross-section. The arched infill layer 5 should be fully filled across the entire cross-section, and materials with low elastic modulus (elastic reaction force) (such as polyurethane, silicone rubber, nitrile rubber, etc.) should be selected.

[0040] As another alternative implementation, the cross-section of the arched structure can be as follows: Figure 4 As shown in the diagram, when the size of the deformable arch structure is large, in order to ensure the stability between the inner arch 3 and the outer arch 4, the arch filling layer 5 can be made of a material with a large elastic modulus (elastic reaction force), such as EPDM rubber, butyl rubber, etc., and local openings 51 can be made to increase its deformation capacity.

[0041] In one or more embodiments, the aforementioned compressed gas storage sealing structure further includes a concrete lining layer 1 and a buffer protective layer. The concrete lining layer 1 is located outside the steel lining 2 sealing layer, i.e., on the side closest to the surrounding rock. The outer surface of the concrete lining layer 1 is smooth, and the inner surface is locally concave at the location of the arched structure of the steel lining 2 to coordinate deformation and match the curved shape of the outer arch 4 of the arched structure. The buffer protective layer is located between the outer arch 4 of the arched structure and the lining, serving to buffer and protect the arched structure, separating it from the concrete lining layer 1, avoiding direct rigid contact, reducing concentrated stress, and preventing sharp concrete blocks from damaging the arched structure.

[0042] In an optional embodiment, the buffer protective layer includes a 2mm thin steel plate protective layer 6 and an elastic buffer layer 8. The steel plate protective layer 6 is anchored in the concrete lining layer 1 by a number of first anchors 7. The two ends of the steel plate protective layer 6 preferably extend to the positions of the steel lining 2 on both sides of the arching structure to isolate external water and concrete blocks at the arching position. The elastic buffer layer 8 is closely attached to the side of the steel plate protective layer 6 near the arching structure and is always in a state of compression deformation. The elastic buffer layer 8 should preferably be made of a material with good elasticity, with a large amount of compression deformation under decompression and a small amount of compression deformation under internal pressure.

[0043] During the increase of internal pressure, the arching structure absorbs the pressure energy through elastic deformation and tends to be gradually flattened, resulting in gaps between the outer arch 4 and the lining. Under the action of internal pressure, the concrete lining layer 1 is subjected to radial compression and circumferential tension, and the inner surface of the concrete lining layer 1 is prone to local spalling due to excessive compressive stress. Therefore, by setting a steel plate protective layer 6 between the outer arch 4 of the arching structure and the concrete lining layer 1, it is possible to prevent some concrete blocks from falling into the gaps when the arching structure deforms downwards, thus preventing the outer arch 4 from being unable to recover when the internal pressure is unloaded. In the gaps, the elastic buffer layer 8 can be used to refill the gaps between the concrete lining layer 1 and the arching structure, reducing the internal stress at the concave position of the concrete lining layer 1 and better adapting to the deformation of the concrete lining layer 1 and the steel lining 2.

[0044] In the depressurized state of the cavern, the steel lining 2 and the arching structure gradually shrink back, and the outer arch 4 returns to its original shape. At this time, the elastic buffer layer 8 can absorb the compressive deformation of the outer arch 4 and then transfer the internal stress to the concrete lining layer 1, providing a certain support force and slowing down the deformation of the concrete lining layer 1.

[0045] In an optional embodiment, it is preferable to pre-set cracks 9 on the inner side of the concrete lining layer 1 within the arched structure range, and to install flexible filler in the cracks 9. This allows the pre-set cracks 9 to concentrate newly developed cracks at concave locations when the concrete lining layer 1 deforms, ensuring that concrete fragments falling from these cracks occur primarily at these locations, reducing cracking in other areas, and thus isolating the concrete lining layer from the arched structure. Simultaneously, the pre-set cracks 9 also facilitate water leakage from these locations when cracks are concentrated in the concrete lining layer 1 corresponding to the arched structure. In such cases, the overall clamping effect of the steel lining and the strong resistance to external pressure from the local arched bulge structure can be utilized to resist external water pressure, allowing for collection and discharge by the drainage system, thus reducing the impact of external water pressure. The pre-set cracks, buffer protective layer, and arched structure help reduce the risk of structural instability and significantly reduce the impact of external water pressure on the deformation of the steel lining.

[0046] In this embodiment, the pre-set crack 9 is located on the inner side of the monolithic concrete lining layer 1, widening from the surrounding rock side to the inner side of the tunnel, and does not penetrate the concrete lining layer 1. Filling material is placed in the pre-set crack 9 to prevent debris from falling in or moisture from seeping in, ensuring structural safety and durability. The filler used for filling should be elastic or adjustable to accommodate minor structural movements and prevent the crack 9 from widening.

[0047] In an optional embodiment, the filler can be asphalt-impregnated hemp fibers, which have waterproof, corrosion-resistant, and elastic cushioning properties. Alternatively, new materials such as caulking compound and weather-resistant sealant can be used to replace asphalt-impregnated hemp fibers.

[0048] By uniformly setting several bulges (arching) deformation designs in the circumference of the steel lining 2, the inner arch 3 and the outer arch 4 can resist the internal air pressure and the external water pressure respectively, and the deformation of the inner arch and the outer arch can be coordinated by the arching filling layer, thereby enhancing the structural adaptability and pressure bearing capacity and extending the service life of the gas storage facility.

[0049] Example 2 Based on Example 1, multiple arching structures can also be continuously arranged around the entire ring. That is, in the circumferential direction, the steel lining is formed by connecting multiple arching structures end to end along the circumferential direction, resulting in a large space for circumferential tensile deformation. In each arching structure, the two ends of the inner arch and the two ends of the outer arch should remain relatively fixed.

[0050] Example 3 Compared to Embodiment 1 or Embodiment 2, this embodiment provides a sealing structure for a compressed gas storage tank, such as... Figure 5 As shown, the main difference lies in the arrangement of the concrete lining layer 1. In this embodiment, the concrete lining layer 1 is arranged in circumferential blocks, comprising multiple block linings 11 and a water-blocking structure. The water-blocking structure is located at the through cracks between adjacent block linings 11, connecting the two adjacent block linings 11 and maintaining the integrity of the concrete lining layer 1. The water-blocking structure can prevent water seepage through the crack channels between the block linings 11, while also coordinating the tensile deformation of the concrete lining layer 1.

[0051] In this embodiment, the water-blocking structure includes a V-shaped steel plate 12, a second anchor 15, steel teeth 13, and filling material 14. The larger end of the V-shaped steel plate 12 faces the surrounding rock. Multiple steel teeth 13 are arranged on opposite sides of the V-shaped steel plate 12, spaced apart along the thickness direction of the concrete lining layer 1. The steel teeth 13 extend longitudinally along the tunnel, with corresponding positions on both sides, allowing them to abut against each other when the V-shaped steel plate 12 is compressed, thus bearing circumferential pressure. The filling material 14 is located inside the V-shaped steel plate 12 and separated vertically by the steel teeth 13. The filling material 14 should have a certain tensile deformation capacity or water-swelling characteristics, adapting to the opening and closing deformation of the V-shaped steel plate 12 while blocking water. For example, elastic materials such as rubber can be used. When the V-shaped steel plate 12 is compressed, the expansion of the internally filled elastic material prevents external water from seeping in. The second anchor 15 is welded to the outer surface of the V-shaped steel plate 12 and anchored to the concrete of the segmented lining 11.

[0052] Under tension, the segmented lining 11 does not bear tensile force, so there is virtually no risk of block falling. Under the action of the outer surrounding rock circumference, the internal pressure is transmitted to the surrounding rock through the concrete lining layer 1. Since the V-shaped steel plate 12 is anchored to the concrete of the segmented lining 11 through the second anchor nail 15, the V-shaped steel plate 12 can open under the action of tensile forces on both sides to provide deformation, while the internal filling material 14 prevents external water from flowing in. Under compression, the circumferential pressure is borne by the filling material 14 and the mutually abutting steel teeth 13. At this time, the channels between the segmented linings 11 are compressed, blocking water seepage through the channels. The external water pressure is directly resisted by the concrete lining layer 1, which can effectively prevent the sealing layer material from deforming excessively and failing under the action of external water pressure. This solution eliminates the need for a drainage system, reducing cost.

[0053] In this embodiment, it is preferable to set the V-shaped steel plate 12 corresponding to the arching structure position, which facilitates better coordinated deformation of the concrete lining layer 1 and the steel lining 2 and provides better adaptability to the expansion and contraction deformation of the arching structure. Accordingly, the concrete lining layer 1 is recessed at the position corresponding to the arching structure to match the installation of the arching structure. It is preferable to set an elastic buffer layer 8 at the recessed position and not set a steel plate protective layer 6 to avoid some problems caused by rigid connection. The internal stress is transmitted to the concrete lining layer 1 through the compression deformation of the elastic buffer layer 8, providing a certain support force. At the same time, the elastic recovery force of the elastic buffer layer 8 is used to fill the gap between the concrete lining layer 1 and the arching structure.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing structure for a compressed gas storage tank, comprising a steel liner (2), characterized in that, The steel lining (2) includes at least one arching structure, which is used to adapt to circumferential deformation. The arching structure includes an inner arch (3) and an outer arch (4). The inner arch (3) and the outer arch (4) are arranged opposite to each other, and the outer arch (4) is arranged on the side of the concrete lining layer (1) relative to the inner arch (3). The inner side of the inner arch (3) and the outer arch (4) are both concave and the outer side are both convex. The inner arch (3) and the outer arch (4) are both made of steel sheets. The concave surfaces of the two steel sheets are interlocked. The inner arch (3) and the outer arch (4) are arranged symmetrically. The two ends of each steel sheet are connected to the end face of the steel lining (2) by welding and are smoothly connected to the inner and outer surfaces of the steel lining (2). An arching filling layer (5) is provided between the inner arch (3) and the outer arch (4). The inner arch (3) and the outer arch (4) absorb pressure energy by generating tensile deformation as a whole under the action of the circumferential tensile stress of the steel lining (2) on both sides.

2. The sealing structure of a compressed gas storage tank according to claim 1, characterized in that, It also includes a concrete lining layer (1), which is recessed at the position of the arching structure to match the installation of the arching structure. The recessed position of the concrete lining layer (1) has a pre-set crack (9) and a steel plate protective layer (6). The steel plate protective layer (6) is anchored to the concrete lining layer (1) by a number of first anchors (7). The two ends of the steel plate protective layer (6) extend to the steel lining (2) on both sides of the arching structure.

3. The sealing structure of a compressed gas storage tank according to claim 2, characterized in that, The crack (9) is set to expand from the side of the surrounding rock to the inside of the cave, and the crack (9) is filled with a filling material.

4. The sealing structure of a compressed gas storage tank according to claim 2, characterized in that, The bottom of the steel plate protective layer (6) is provided with an elastic buffer layer (8).

5. The sealing structure of a compressed gas storage tank according to claim 1, characterized in that, It also includes a concrete lining layer (1), which is divided into blocks along the circumference. A V-shaped steel plate (12) is provided between two adjacent blocks of lining (11). The larger opening end of the V-shaped steel plate (12) is set towards the surrounding rock side. The two sides of the V-shaped steel plate (12) are anchored to the corresponding blocks of lining (11) by a number of second anchors (15). A number of steel teeth (13) are provided on the opposite sides of the V-shaped steel plate (12). The steel teeth (13) on both sides are in corresponding positions and in contact with each other. A filling material (14) is provided between the upper and lower steel teeth (13). The filling material (14) is used to block water.

6. The sealing structure of a compressed gas storage tank according to claim 5, characterized in that, The V-shaped steel plate (12) corresponds to the arching structure position; the concrete lining layer (1) is recessed at the arching structure position and an elastic buffer layer (8) is provided at the recessed position to match the arching structure installation.

7. The sealing structure of a compressed gas storage tank according to claim 1, characterized in that, The inner arch (3) and the outer arch (4) are both made of zigzag steel plates, or the inner arch (3) and the outer arch (4) are both made of arc-shaped steel plates.

8. The sealing structure of a compressed gas storage tank according to claim 1, characterized in that, At least two arching structures are provided along the circumference of the steel lining (2), and each arching structure is spaced apart in the circumference of the steel lining (2), or at least two arching structures are connected sequentially along the circumference.

9. A sealing structure for a compressed gas storage tank according to any one of claims 1-8, characterized in that, The arching filling layer (5) has openings (51).

10. A sealing structure for a compressed gas storage tank according to any one of claims 1-8, characterized in that, The arching filling layer (5) is made of polyurethane, silicone rubber, nitrile rubber, EPDM rubber or butyl rubber.

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