Compressed air energy storage cavern semi-precast pipe section and construction method

Abstract

The application relates to the field of compressed air energy storage caverns, in particular to a compressed air energy storage cavern semi-precast pipe section and a construction method. The semi-precast pipe section comprises a steel-mix layer, a steel plate layer and a filler pipe, the steel plate layer is located on the inner side of the steel-mix layer, the outer side of the steel-mix layer is provided with a post-poured groove, the post-poured groove is provided with reserved steel bars, the reserved steel bars are connected with the steel bar framework in the steel-mix layer, the filler pipe penetrates through the steel-mix layer and the steel plate layer to connect the inner side of the semi-precast pipe section and the post-poured groove, and the longitudinal end face of the semi-precast pipe section is provided with a closing structure. The semi-precast pipe section can be prefabricated in a factory, and the splicing between two adjacent semi-precast pipe sections can be completed at the hole opening of the cavern, thereby greatly reducing the splicing and welding operation in the cavern, avoiding the generation of a large amount of toxic and harmful smoke in the cavern, and effectively guaranteeing the occupational health and operation safety of the on-site construction personnel.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage caverns, and particularly to a semi-prefabricated pipe section for compressed air energy storage caverns and its construction method. Background Technology

[0002] Compressed air energy storage is a physical energy storage technology with advantages in large-scale and long-term energy storage. The underground cavern, as a storage container for high-pressure gas, directly determines the economy and reliability of the entire energy storage system through its sealing performance, structural safety, and construction efficiency.

[0003] In existing technologies, compressed air energy storage caverns are typically excavated into tunnel sections using conventional mining methods or drill-and-blast methods. This is followed by the application of shotcrete initial support, a waterproof layer, and cast-in-place concrete secondary lining to transfer gas pressure to the surrounding rock through the lining structure. To meet the zero-leakage sealing requirements of high-pressure gas, existing solutions typically use a full-ring steel plate as a dedicated sealing layer on the inner surface of the secondary lining, relying on the tightness of the steel plate to block gas leakage paths.

[0004] However, the entire ring of steel plates usually needs to be assembled and welded inside the tunnel. Due to the limited working space and poor natural ventilation inside the tunnel, a large amount of toxic and harmful fumes will be continuously generated during the welding process, which will threaten the occupational health and work safety of on-site construction personnel. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art where, during the construction of compressed air energy storage caverns, the entire ring of steel plates typically needs to be assembled and welded inside the cavern. This is constrained by limited working space and poor natural ventilation within the cavern, and the welding process continuously generates a large amount of toxic and harmful fumes, thus threatening the occupational health and safety of on-site construction personnel. Therefore, this invention provides a semi-prefabricated pipe section for compressed air energy storage caverns and a construction method thereof.

[0006] In a first aspect, the present invention provides a semi-prefabricated pipe section for a compressed air energy storage cavern. The semi-prefabricated pipe section includes a reinforced concrete layer, a steel plate layer, and a filler pipe. The steel plate layer is located inside the reinforced concrete layer. A post-casting groove is provided on the outer side of the reinforced concrete layer, and a reserved reinforcing bar is provided in the post-casting groove. The reserved reinforcing bar is connected to the reinforcing bar skeleton in the reinforced concrete layer. The filler pipe penetrates the reinforced concrete layer and the steel plate layer to connect the inner side of the semi-prefabricated pipe section and the post-casting groove. The longitudinal end face of the semi-prefabricated pipe section is provided with a tapering structure.

[0007] This invention provides a semi-prefabricated pipe section for a compressed air energy storage cavern. The reinforced concrete layer serves as the skeleton of the entire semi-prefabricated pipe section, and the steel plate layer forms a sealing layer for the inner wall of the compressed air energy storage cavern, relying on the tightness of the steel plate to block gas leakage paths. The packing pipe is used to pump concrete into the post-casting trench after the semi-prefabricated pipe section is installed in place. After the post-casting trench is filled with concrete, it can cooperate with the reserved reinforcing bars and form a tight connection with the surrounding rock of the cavern to effectively fix the semi-prefabricated pipe section. The tapered structure of the longitudinal end face of the semi-prefabricated pipe section facilitates accurate docking between two adjacent semi-prefabricated pipe sections.

[0008] This invention provides a semi-prefabricated pipe section for compressed air energy storage caverns. The semi-prefabricated pipe section can be prefabricated in a factory, thereby greatly reducing the assembly and welding work inside the cavern, thus avoiding the generation of a large amount of toxic and harmful fumes inside the cavern, and effectively protecting the occupational health and work safety of on-site construction personnel.

[0009] The longitudinal end face of the semi-prefabricated pipe section refers to the end face at both ends of the pipe section that are used for docking along the axial direction.

[0010] Preferably, the longitudinal end face of the semi-prefabricated pipe section is provided with a sealing strip.

[0011] In this design, the sealing strip can be compressed after two adjacent semi-prefabricated pipe sections are joined together, thereby ensuring the sealing between the two adjacent semi-prefabricated pipe sections.

[0012] The closing structure can be an outwardly inclined surface or a stepped closing.

[0013] Preferably, the closing structure is a stepped closing structure.

[0014] In this design, the stepped end can form a physical limit, making it less likely for radial slippage to occur when the semi-prefabricated pipe sections are joined, and making it easier to control the alignment accuracy of the joints.

[0015] The post-casting groove can be configured as multiple independent segments along the circumference of the semi-prefabricated pipe section, or it can be arranged continuously along the entire circumference of the semi-prefabricated pipe section.

[0016] Preferably, the post-cast groove is continuously arranged circumferentially along the semi-prefabricated pipe section to form a circumferential groove.

[0017] Under this preferred arrangement, the continuous circumferential post-casting groove can achieve uniform flow and filling of the filler in the circumferential space, eliminating the need to repeatedly lay filler pipes at multiple points in the circumferential direction, which can directly and significantly reduce the number of filler pipes required.

[0018] In a second aspect, the present invention provides a construction method for a compressed air energy storage cavern, applied to a semi-prefabricated pipe section for a compressed air energy storage cavern as described in the first aspect, comprising the following steps:

[0019] S1: Hoist the semi-prefabricated pipe section to the entrance of the excavated cavern. At the entrance of the cavern, connect the semi-prefabricated pipe section to be installed with the semi-prefabricated pipe section that has been pushed into the cavern. Then, perform full welding connection on the steel plate layers of the two semi-prefabricated pipe sections after connection. S2: The welded semi-prefabricated pipe section is pushed into the cavern along the cavern axis using a jacking device; S3: Repeat steps S1 and S2 until all the semi-prefabricated pipe sections are pushed to the design position. Concrete is pumped into the post-cast trench outside the semi-prefabricated pipe sections through the filler pipes on the semi-prefabricated pipe sections to complete the construction of the compressed air energy storage cavern.

[0020] This invention provides a construction method for a compressed air energy storage cavern. This method enables the welding of the steel plate sealing layer forming the inner wall of the compressed air energy storage cavern to be completed at the processing plant or at the cavern entrance, thereby greatly reducing the assembly and welding work inside the cavern and avoiding the generation of a large amount of toxic and harmful fumes inside the cavern, effectively protecting the occupational health and work safety of on-site construction personnel.

[0021] Preferably, the fabrication of the semi-prefabricated pipe section includes the following steps: S01: Several arc-shaped steel plates are spliced ​​together in the circumferential direction to form a ring-shaped steel plate layer. All splicing gaps are sealed by double-sided full welding. S02: Weld shear studs to the outside of the steel plate layer and tie the reinforcing steel skeleton of the semi-prefabricated pipe section; S03: A circular steel plate is used as the bottom mold, the steel plate layer is used as the inner ring template, and the channel template is used as the outer ring template to enclose and form the casting cavity of the steel-concrete layer. The channel template is provided with positioning holes, and the steel reinforcement skeleton is provided with joint steel bars. The joint steel bars are passed through the positioning holes. S04: Pour concrete into the casting cavity to form the steel-concrete layer. After the steel-concrete layer has cured and formed, remove the outer ring template and the bottom template. Then, weld the reserved reinforcing bars to the joint reinforcing bars to complete the production of the semi-prefabricated pipe section.

[0022] In this scheme, the joints of the curved steel plates are sealed using a double-sided full welding process, which significantly improves the overall airtightness of the steel plate sealing layer inside the compressed air energy storage cavern, effectively reducing the risk of gas leakage under high-pressure conditions. Shear studs pre-welded to the outside of the steel plate layer enhance the shear strength between the steel plate layer and the reinforced concrete layer, preventing separation and misalignment of the two layers under stress. Pre-set positioning holes on the channel-shaped formwork allow the joint reinforcement of the reinforcing steel skeleton to be directly exposed. After demolding, the reserved reinforcement is welded to the joint reinforcement, avoiding the problem of the reserved reinforcement easily snagging on the formwork and hindering the demolding operation.

[0023] Preferably, in step S3, when pumping concrete into the post-pouring tank through the packing pipe, a grouting process of graded pressure increase and pressure stabilization is adopted.

[0024] This solution effectively ensures that the gaps between the post-cast trench and the semi-precast pipe sections and the surrounding rock are completely filled with concrete grout, reducing the probability of voids or blind spots in the filling. The staged pressure increase and stabilization grouting process involves gradually increasing the grouting pressure to the design value in 2-3 stages. At each pressure level, the pressure is increased again only after the grout absorption drops to the threshold value. After reaching the final pressure, the pressure is maintained for a sufficient period of time to allow the grout to fully penetrate and fill the gaps, avoiding grout leakage and structural disturbance caused by sudden pressure increases, and ensuring the compactness of the filling.

[0025] Preferably, the concrete pumped into the post-pouring tank is self-compacting concrete, micro-expansion concrete, or fiber-reinforced concrete.

[0026] Preferably, in step S2, during the process of pushing the semi-prefabricated pipe section into the cavern along the cavern axis, friction-reducing mud is injected between the outer wall of the semi-prefabricated pipe section and the surrounding rock.

[0027] In this scheme, the friction-reducing mud can reduce the resistance of the semi-prefabricated pipe section during jacking, while protecting the surface of the surrounding rock and further improving the bonding quality between the semi-prefabricated pipe section and the surrounding rock.

[0028] The tunnel can be excavated using manual blasting or a full-face pipe jacking machine.

[0029] Preferably, a full-face pipe jacking machine is used for tunneling the cavern.

[0030] This preferred solution involves no blasting operations, which can reduce disturbance to the surrounding rock and lower the frictional resistance of subsequent semi-prefabricated pipe section jacking.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a semi-prefabricated pipe section for compressed air energy storage caverns. The semi-prefabricated pipe section can be prefabricated in a factory, thereby greatly reducing the assembly and welding operations inside the cavern, thus avoiding the generation of a large amount of toxic and harmful fumes inside the cavern, and effectively protecting the occupational health and work safety of on-site construction personnel. 2. This invention provides a construction method for a compressed air energy storage cavern. This construction method enables the welding operation of the steel plate sealing layer forming the inner wall of the compressed air energy storage cavern to be completed in the processing plant or at the cavern entrance, thereby greatly reducing the assembly and welding operations inside the cavern and avoiding the generation of a large amount of toxic and harmful fumes inside the cavern, effectively protecting the occupational health and work safety of on-site construction personnel. Attached Figure Description

[0032] Figure 1 This is a front view of a semi-prefabricated pipe section.

[0033] Figure 2 for Figure 1 Cross-sectional view at the location of the AA section line.

[0034] Figure 3 This is a schematic diagram of the jacking construction of semi-prefabricated pipe sections.

[0035] Marked in the image: 1- Semi-prefabricated pipe section, 11-Reinforced concrete layer, 111-Sealing strip, 112-Post-pouring groove, 113-Reserved reinforcing steel, 12-Steel plate layer, 121-Splicing weld, 13-Filling pipe. 2- Surrounding rock, 3-Pushing equipment, 4-Full-section pipe jacking machine. Detailed Implementation

[0036] 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.

[0037] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are 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 usually 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, and for 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.

[0038] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, 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%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0039] 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.

[0040] 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 two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0041] 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 connection methods commonly used 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.

[0042] Example 1 like Figure 1 and Figure 2 As shown, a semi-prefabricated pipe section for compressed air energy storage cavern is disclosed. The semi-prefabricated pipe section 1 includes a reinforced concrete layer 11, a steel plate layer 12, and a packing pipe 13. The steel plate layer 12 is located inside the reinforced concrete layer 11. A post-casting groove 112 is provided on the outer side of the reinforced concrete layer 11, and a reserved reinforcing bar 113 is provided in the post-casting groove 112. The reserved reinforcing bar 113 is connected to the reinforcing bar skeleton in the reinforced concrete layer 11. The packing pipe 13 penetrates the reinforced concrete layer 11 and the steel plate layer 12 to connect the inner side of the semi-prefabricated pipe section 1 and the post-casting groove 112. The longitudinal end face of the semi-prefabricated pipe section 1 is provided with a tapering structure.

[0043] Specifically, the steel plate layer 12 can be composed of several arc-shaped steel plates spliced ​​together, with adjacent arc-shaped steel plates connected by a splicing weld 121. The thickness of the steel plate layer 12 can be determined according to the design gas pressure in the tunnel, the pipe section diameter, and the material strength, generally between 10mm and 50mm. The edges of the steel plate layer 12 can be beveled for bevel welding. The longitudinal length of the semi-prefabricated pipe section 1 can be 1m to 3m. The thickness of the reinforced concrete layer 11 can be 200mm to 300mm, and the depth of the post-cast groove 112 can be 100mm to 180mm.

[0044] Specifically, the outer end of the packing pipe 13 is flush with the bottom of the post-casting groove 112, and the inner end of the packing pipe 13 is flush with the inner surface of the steel plate layer 12. The packing pipe 13 is made of steel pipe or PVC pipe. Multiple packing pipes 13 can be arranged at equal intervals along the circumference of the semi-prefabricated pipe section 1.

[0045] Specifically, the reinforcing steel cage within the reinforced concrete layer 11 includes circumferential main bars and longitudinal main bars. The diameter and spacing of the circumferential and longitudinal main bars are determined based on the thickness of the reinforced concrete layer 11 and the stress requirements. For example, the spacing of the circumferential main bars can be set to 100mm-200mm.

[0046] Specifically, such as Figure 1As shown, the semi-prefabricated pipe section 1 is a complete circular structure. The meaning of "semi-prefabricated" here is that only part of the structure of the pipe section has been prefabricated. The remaining concrete in the post-casting groove 112 needs to be poured on site by grouting after the pipe section is installed in the designated position in the cavern, so as to form a firm connection with the surrounding rock 2.

[0047] This prefabricated structure design allows the splicing of two adjacent semi-prefabricated pipe sections 1 to be completed at the opening of the cavern.

[0048] In an optional embodiment, a sealing strip 111 may be provided on the longitudinal end face of the semi-prefabricated pipe section 1.

[0049] Specifically, the sealing strip 111 can be set on the end face of the reinforced concrete layer 11. A groove is provided on the end face of the reinforced concrete layer 11, and the sealing strip 111 is embedded in the groove. The sealing strip 111 can be made of rubber, silicone, or water-swellable material. After two adjacent semi-prefabricated pipe sections 1 are joined, the sealing strip 111 is pressed between the two adjacent semi-prefabricated pipe sections 1.

[0050] In an optional implementation, the closing structure may be a stepped closing structure.

[0051] Specifically, the stepped end includes a first step surface and a second step surface arranged sequentially along the axial direction of the pipe section. When two adjacent semi-prefabricated pipe sections 1 are connected, the first step surface of the preceding pipe section and the second step surface of the following pipe section are fitted and matched with each other.

[0052] The constriction structure ensures that two adjacent semi-prefabricated pipe sections 1 can be quickly and accurately connected, and at the same time, it enables the outer periphery of the semi-prefabricated pipe section 1 to fit tightly with the surrounding rock 2 during the jacking process.

[0053] In an optional embodiment, the post-cast groove 112 can be continuously arranged along the circumference of the semi-prefabricated pipe section 1 to form a circumferential groove.

[0054] Specifically, the cross-sectional shape of the post-cast groove 112 is U-shaped or trapezoidal. The reserved reinforcing bars 113 are arranged in a U-shaped bend within the post-cast groove 112.

[0055] Example 2 like Figure 3 As shown, a construction method for a compressed air energy storage cavern, using a semi-prefabricated pipe section for a compressed air energy storage cavern as described in Example 1, includes the following steps: S1: Hoist the semi-prefabricated pipe section 1 to the entrance of the excavated cavern. At the entrance of the cavern, connect the semi-prefabricated pipe section 1 to be installed with the semi-prefabricated pipe section 1 that has been pushed into the cavern. Then, perform full welding connection on the steel plate layers 12 of the two semi-prefabricated pipe sections 1 after connection.

[0056] Specifically, during the docking of semi-prefabricated pipe sections 1, a laser collimator is used to monitor the coaxiality of the docking in real time, controlling the radial deviation of the axis of two adjacent semi-prefabricated pipe sections 1 to be no more than 2mm, and the misalignment of the end faces to be no more than 1 / 10 of the wall thickness of the steel plate layer 12. After the full welding connection of the steel plate layer 12 is completed, a gas pressure leak test is simultaneously conducted on the sealing performance of the docking joint, and the test pressure is no less than 1.1 times the design working pressure of the subsequent cavern.

[0057] S2: The welded semi-prefabricated pipe section 1 is pushed into the cavern along the cavern axis by the jacking device 3.

[0058] Specifically, during the jacking process, the tapering structure at the end face of the semi-prefabricated pipe section 1 ensures a tight fit between its outer periphery and the excavated surrounding rock 2. This tapering structure allows the semi-prefabricated pipe section 1 to adapt to the contour of the surrounding rock 2 during jacking, guaranteeing a close fit and facilitating the uniform transmission of internal pressure. The jacking equipment 3 can employ multiple symmetrically arranged hydraulic jacking cylinders, with synchronized control of the jacking stroke of all cylinders. The maximum jacking force of a single semi-prefabricated pipe section 1 does not exceed 70% of its axial compressive bearing capacity.

[0059] S3: Repeat steps S1 and S2 until all the semi-prefabricated pipe sections 1 are pushed to the design position. Concrete is pumped into the post-casting groove 112 on the outside of the semi-prefabricated pipe section 1 through the filler pipe 13 on the semi-prefabricated pipe section 1 to complete the construction of the compressed air energy storage cavern.

[0060] Specifically, after the concrete pumping operation in the post-cast trench 112, a secondary anti-corrosion coating is applied to all butt welds inside the semi-precast pipe section 1, with a coating thickness of not less than 200μm. After the coating is completed, a 72-hour water tightness and air tightness test is conducted to verify the overall airtightness of the tunnel. After pumping concrete into the post-cast trench 112, the semi-precast pipe section 1 and the surrounding rock 2 can together form an integral load-bearing structure.

[0061] After the jacking is completed, concrete is filled into the back pouring groove 112 through the filling pipe 13 to form an integral lining structure that is closely attached to the surrounding rock 2. The force transmission path is clear, avoiding the problems of uneven thickness and discontinuous force transmission in traditional filling and leveling layers.

[0062] In an optional embodiment, the fabrication of the semi-prefabricated pipe section 1 may include the following steps: S01: Several arc-shaped steel plates are spliced ​​together in the circumferential direction to form a ring-shaped steel plate layer 12. All splicing gaps are welded and sealed using a double-sided full welding process.

[0063] Specifically, after the splicing is completed, all double-sided full welds are subjected to 100% ultrasonic testing to ensure that there are no defects exceeding the standard inside the welds. The steel plate layer 12 can complete all processes such as material cutting, rolling, welding, flaw detection and corrosion protection in the factory. The welding conditions are good and the quality is controllable, avoiding the impact of single-sided welding in the hole and harsh environment on the weld quality, and significantly improving the sealing reliability.

[0064] S02: Weld shear studs to the outside of the steel plate layer 12 and tie the steel reinforcement cage of the semi-prefabricated pipe section 1.

[0065] Specifically, the shear studs welded to the outside of the steel plate layer 12 are arranged in a quincunx pattern. The length of the shear studs is 1 / 4 to 1 / 3 of the designed thickness of the steel-concrete layer 11, and the spacing between two adjacent shear studs is 50mm to 100mm.

[0066] Shear studs can also be replaced with anchor bars or other connectors, all of which are intended to enhance the bond and shear resistance with the steel-concrete layer 11.

[0067] S03: A circular steel plate is used as the bottom mold, a steel plate layer 12 is used as the inner ring template, and a channel-shaped template is used as the outer ring template to enclose and form the casting cavity of the steel-concrete layer 11. The channel-shaped template is provided with positioning holes, and the steel reinforcement skeleton is provided with joint steel bars, through which the joint steel bars are passed.

[0068] Specifically, the groove-shaped template is adapted to the outer side of the steel-concrete layer 11 and the post-pouring groove 112.

[0069] S04: Pour concrete into the casting cavity to form the steel-concrete layer 11. After the steel-concrete layer 11 has been cured and formed, remove the outer ring template and the bottom template. Then, weld the reserved steel bars 113 to the joint steel bars to complete the production of the semi-prefabricated pipe section 1.

[0070] Specifically, after the steel-concrete layer 11 is poured, a steam curing process is adopted, with the curing temperature controlled between 50℃ and 60℃ and the curing time not less than 8 hours. Demolding and subsequent hoisting and transportation operations are carried out only after the concrete strength reaches 100% of the design strength.

[0071] The aforementioned semi-prefabricated pipe section 1 is manufactured in the factory and then transported to the tunnel construction site.

[0072] In an optional embodiment, in step S3, when pumping concrete into the post-pouring trough 112 through the packing pipe 13, a grouting process of graded pressure increase and pressure stabilization can be adopted.

[0073] Specifically, the grouting pressure is determined based on the conditions of the surrounding rock 2 and the volume of the post-cast trench 112. The grouting process employing graded pressure increases and pressure stabilization ensures that the concrete filling is dense and free of voids, and that the outer side of the semi-precast pipe section 1 is tightly bonded to the surrounding rock 2. After filling, the filling pipe 13 can be sealed with the same or compatible sealing material as the inner steel plate layer 12 to ensure the airtightness of the cavern.

[0074] In an alternative embodiment, the concrete pumped into the post-pouring tank 112 may be self-compacting concrete, micro-expansion concrete, or fiber-reinforced concrete. These concrete materials can improve the filling density and crack resistance, and adapt to the deformation requirements of the cavity under internal pressure.

[0075] In an optional embodiment, during step S2, when the semi-prefabricated pipe section 1 is pushed into the cavern along the cavern axis, friction-reducing slurry can be injected between the outer wall of the semi-prefabricated pipe section 1 and the surrounding rock 2.

[0076] Specifically, the friction-reducing mud is made by mixing bentonite, carboxymethyl cellulose, soda ash and water in a preset ratio, and the mud specific gravity is controlled between 1.1 and 1.3 g / cm³.

[0077] In an optional implementation, a full-face pipe jacking machine 4 can be used to excavate the tunnel.

[0078] Specifically, the cutterhead diameter of the full-face pipe jacking machine 4 is 50mm to 80mm larger than the outer diameter of the steel-concrete layer 11 of the semi-prefabricated pipe section 1. During the pipe jacking process, the stress and deformation data of the surrounding rock 2 are collected in real time, and the tunneling speed and muck discharge are dynamically adjusted based on the monitoring results. The use of the full-face pipe jacking machine 4 minimizes disturbance to the surrounding rock 2, maximizes the preservation of the original bearing capacity of the surrounding rock 2, reduces the loosened zone, lowers the load required to be borne by the semi-prefabricated pipe section 1, and improves the long-term stability of the tunnel.

[0079] Specifically, during the tunnel excavation process, the semi-prefabricated pipe sections 1 are sequentially pushed in along the tunnel axis by the jacking equipment 3, and the cutting and removal of the soil in front is completed by the full-face pipe jacking machine 4. The cutting operation of the full-face pipe jacking machine 4 causes significantly less disturbance to the surrounding rock 2 than the drill and blast method, which is conducive to maintaining the original bearing capacity of the surrounding rock 2.

[0080] This invention also effectively solves the technical problems of poor welding quality of sealing steel plates in traditional compressed air energy storage caverns, harsh working conditions inside the cavern, uneven force transmission, and large disturbance of surrounding rock, and has high application value.

[0081] 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 semi-prefabricated pipe section for compressed air energy storage cavern, characterized in that, The semi-precast pipe section (1) includes a reinforced concrete layer (11), a steel plate layer (12), and a filler pipe (13). The steel plate layer (12) is located inside the reinforced concrete layer (11). A post-casting groove (112) is provided on the outside of the reinforced concrete layer (11). A reserved reinforcing bar (113) is provided in the post-casting groove (112). The reserved reinforcing bar (113) is connected to the reinforcing bar skeleton in the reinforced concrete layer (11). The filler pipe (13) penetrates the reinforced concrete layer (11) and the steel plate layer (12) to connect the inside of the semi-precast pipe section (1) and the post-casting groove (112). The longitudinal end face of the semi-precast pipe section (1) is provided with a tapering structure.

2. The semi-prefabricated pipe section for compressed air energy storage cavern according to claim 1, characterized in that, The longitudinal end face of the semi-prefabricated pipe section (1) is provided with a sealing strip (111).

3. A semi-prefabricated pipe section for compressed air energy storage cavern according to claim 1, characterized in that, The closing structure is a stepped closing structure.

4. A semi-prefabricated pipe section for compressed air energy storage cavern according to claim 1, characterized in that, The post-cast groove (112) is continuously arranged circumferentially along the semi-prefabricated pipe section (1) to form a circumferential groove.

5. A construction method for a compressed air energy storage cavern, characterized in that, The application of a semi-prefabricated pipe section for compressed air energy storage cavern as described in any one of claims 1-4 includes the following steps: S1: The semi-prefabricated pipe section (1) is hoisted to the entrance of the excavated cavern. At the entrance of the cavern, the semi-prefabricated pipe section (1) to be installed is connected with the semi-prefabricated pipe section (1) that has been pushed into the cavern. The steel plate layer (12) of the two semi-prefabricated pipe sections (1) after connection is fully welded. S2: The welded semi-prefabricated pipe section (1) is pushed into the cavern along the cavern axis by the jacking device (3); S3: Repeat steps S1 and S2 until all the semi-prefabricated pipe sections (1) are pushed to the design position. Concrete is pumped into the post-casting groove (112) outside the semi-prefabricated pipe section (1) through the filler pipe (13) on the semi-prefabricated pipe section (1) to complete the construction of the compressed air energy storage cavern.

6. The construction method of a compressed air energy storage cavern according to claim 5, characterized in that, The fabrication of the semi-prefabricated pipe section (1) includes the following steps: S01: Several arc-shaped steel plates are spliced ​​together along the circumferential direction to form a ring-shaped steel plate layer (12). All splicing gaps are sealed by double-sided full welding process. S02: Weld shear studs to the outside of the steel plate layer (12) and tie the steel reinforcement skeleton of the semi-prefabricated pipe section (1); S03: A circular steel plate is used as the bottom mold, the steel plate layer (12) is used as the inner ring template, and the channel template is used as the outer ring template to enclose and form the casting cavity of the steel-concrete layer (11). The channel template is provided with positioning holes, and the steel reinforcement skeleton is provided with joint steel bars. The joint steel bars are passed through the positioning holes. S04: Pour concrete into the casting cavity to form the steel-concrete layer (11). After the steel-concrete layer (11) has been cured and formed, remove the outer ring template and the bottom template. Then weld the reserved steel bars (113) to the joint steel bars to complete the production of the semi-prefabricated pipe section (1).

7. The construction method of a compressed air energy storage cavern according to claim 5, characterized in that, In step S3, when pumping concrete into the post-pouring tank (112) through the filling pipe (13), a grouting process of graded pressure increase and pressure stabilization is adopted.

8. The construction method of a compressed air energy storage cavern according to claim 5, characterized in that, The concrete pumped in the post-pouring tank (112) is self-compacting concrete, micro-expansion concrete or fiber-reinforced concrete.

9. The construction method of a compressed air energy storage cavern according to claim 5, characterized in that, In step S2, during the process of pushing the semi-prefabricated pipe section (1) into the cavern along the cavern axis, friction-reducing mud is injected between the outer wall of the semi-prefabricated pipe section (1) and the surrounding rock (2).

10. A construction method for a compressed air energy storage cavern according to claim 5, characterized in that, The tunnel was excavated using a full-face pipe jacking machine (4).

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