Prefabricated Lining Compressed Gas Energy Storage Depot for Abandoned Rock Caverns and Its Construction Method

Abstract

The present invention provides a prefabricated lining type compressed gas energy storage reservoir for abandoned rock caverns and a construction method thereof. The energy storage reservoir includes an abandoned rock cavern and an energy storage structure disposed in the abandoned rock cavern. The energy storage structure includes an inner plugging structure away from the cave entrance end of the rock cavern, an outer plugging structure adjacent to the cave entrance end of the rock cavern, and an energy storage reservoir. The energy storage reservoir sequentially includes a preliminary consolidation layer, a drainage structure, a prefabricated lining main body, a heat insulation layer, and an energy storage cylinder from outside to inside. The preliminary consolidation layer is constructed on the inner wall of the annular chamber rock mass of the rock cavern. The prefabricated lining main body is assembled by using ultra-high performance concrete masonry sheets, and an energy storage cavity matching the outer wall of the energy storage cylinder is formed inside. The energy storage cylinder is disposed in the energy storage cavity, and an isolation layer is provided on the inner wall of the energy storage cylinder. The present invention is a combined sheet type compressed gas energy storage reservoir with simple structure, convenient construction, and easy control. While having good structural strength, it can reduce the impact of construction on abandoned mine tunnels, and can produce good economic and social benefits.

Description

Technical Field

[0001] The present invention relates to the field of cavern energy storage, and specifically to a prefabricated lining type compressed gas energy storage reservoir for abandoned caverns and a construction method thereof, which are mainly used for the construction of energy storage reservoirs such as compressed natural gas, hydrogen, and inert gas in abandoned caverns and mine adits. Background Art

[0002] Compressed gas energy storage systems are considered to be one of the most promising large-scale energy storage technologies. For various "intermittent" renewable energy types that are greatly affected by weather conditions, such as wind energy and solar energy, their off-peak or excess electricity can be obtained at low cost, converted into gas energy, compressed and stored in shallow buried storage tanks. When needed, this high-pressure compressed gas is released to meet the energy supply demand. To meet the pressure storage requirements, the wall thickness and material of the storage tank are relatively demanding. If deep buried storage tanks are used, there are difficulties for construction workers to enter for construction. China is a large resource country. At present, there are extremely large-scale abandoned mine cave resources in various regions of China. Some abandoned mine caves still maintain good structural stability after being abandoned due to the characteristics of the mined minerals and have high utilization value. Using abandoned mine caves to build compressed gas energy storage systems has not been widely applied on a large scale worldwide and is still a cutting-edge technology. A large number of investigation data confirm that it is feasible to use mine caves with good geological conditions and large burial depths to build compressed gas energy storage reservoirs. Currently, the research pilot mainly uses cast-in-place structures to build lining structures. Although this construction method has the characteristics of being simple and easy to implement, due to the limited internal space of the abandoned mine cave, many construction machines cannot carry out work, and the large amount of chamber construction will lead to problems such as long construction time and difficulty in large-volume concrete construction; moreover, since this construction structure is used in the field of compressed gas energy storage, during the gas injection and production stage, the lining layer will expand and contract under pressure changes, and over time, cracks will appear in the concrete masonry structure and cause damage. To reduce the impact on abandoned mine caves, developing a construction method with a simple structure, convenient construction, easy control, good structural strength, and low cost will produce good economic and social benefits. Summary of the Invention

[0003] The present invention provides a prefabricated lining type compressed gas energy storage reservoir for abandoned caverns and a construction method thereof for the construction problems of existing compressed gas energy storage reservoirs. The structure of the energy storage reservoir can reduce the influence of the external environment on the gas inside the energy storage reservoir while ensuring the quality of the energy storage reservoir. Moreover, the main structure is assembled by concrete lining sheets, which can reduce the construction time, lower the construction difficulty, and increase the pressure value of the gas that the energy storage reservoir can store.

[0004] In order to achieve the above technical objectives, the present invention provides a prefabricated lining type compressed gas energy storage reservoir for abandoned rock caverns, which includes an abandoned rock cavern and an energy storage structure disposed within the abandoned rock cavern. The energy storage structure includes an inner sealing structure away from the cave entrance end, an outer sealing structure adjacent to the cave entrance end, and an energy storage reservoir disposed between the inner sealing structure and the outer sealing structure. The energy storage reservoir sequentially includes a preliminary consolidation layer, a drainage structure, a prefabricated lining main body, a heat insulation layer, and an energy storage cylinder from outside to inside. The preliminary consolidation layer is constructed on the inner wall of the annular chamber rock mass of the rock cavern. The prefabricated lining main body is assembled by splicing ultra-high performance concrete masonry sheets, and an energy storage cavity matching the outer wall of the energy storage cylinder is formed inside. The adjacent two concrete masonry sheets of the prefabricated lining main body are connected by a tie rod structure. The energy storage cylinder is disposed within the energy storage cavity, and an isolation layer is provided on the inner wall of the energy storage cylinder. A reserved pore passage is provided at one end of the prefabricated lining main body adjacent to the cave entrance, and a circular through pore passage is provided at the position of the outer sealing structure corresponding to the reserved pore passage. An energy storage pipeline is provided on the energy storage cylinder, and the energy storage pipeline extends out of the outer sealing structure through the reserved pore passage and the circular through pore passage.

[0005] A preferred technical solution of the present invention: The prefabricated lining main body is a columnar structure with a gate-shaped cross-section in appearance, and its energy storage cavity is a capsule-shaped structure with spherical ends and a circular cross-section in the middle. The isolation layer closely adheres to the inner wall of the energy storage cylinder. The concrete masonry sheets of the prefabricated lining main body include a near-cave-entrance end sheet group, a far-cave-entrance end sheet group, and a standard section sheet group in the middle. The near-cave-entrance end sheet group is spliced into a near-cave-entrance end lining structure with a hemispherical inner surface, and a reserved pore passage is provided in the middle of the near-cave-entrance end lining structure. The far-cave-entrance end sheets are spliced into a far-cave-entrance end masonry structure with a closed hemispherical inner surface. The standard section sheet group in the middle is spliced into a middle section masonry structure with a cylindrical inner cavity. The concrete masonry sheets of the prefabricated lining main body are spliced using a T-shaped staggered joint splicing method, and the spliced concrete masonry sheets are fastened by tensioned prestressing tendons.

[0006] A preferred technical solution of the present invention: The drainage structure includes vertical drain pipes, horizontal drain pipes, drainage pipelines, and a reservoir. Both the vertical drain pipes and the horizontal drain pipes are top-perforated corrugated pipes with a diameter ≥ 100 mm, and a permeable geotextile is wrapped around each pipe body. They are laid horizontally and vertically every 500 - 1000 mm on the outer surface of the prefabricated lining main body. Two horizontal drain pipes are symmetrically arranged in a V shape on both sides of each vertical drain pipe. The slope of the horizontal drain pipes is 2% - 5%, and water collection holes are opened on the side away from the prefabricated lining main body. A permeable concrete layer is provided on the outer periphery of the horizontal drain pipes and the vertical drain pipes. The drainage pipelines are laid at the bottoms of both ends of the energy storage reservoir. The vertical drain pipes and the horizontal drain pipes are connected to the drainage pipelines and lead to the reservoir outside the energy storage reservoir through the drainage pipelines. A high-strength mortar layer and a waterproof board are provided between the drainage structure and the prefabricated lining main body, and the waterproof board is adjacent to the drainage structure.

[0007] A preferred technical solution of the present invention: The abandoned rock cave is a deep horizontal tunnel. The preliminary consolidation layer is a reinforcement layer formed by grouting the cavity after treating the irregular block stones and cracks on the inner wall of the deep horizontal tunnel and spraying concrete. The outer plugging structure is arranged at the part of the assembled lining body close to the tunnel entrance, and the inner plugging structure is arranged at the far end of the assembled lining body from the tunnel entrance. Both the inner plugging structure and the outer plugging structure are cast-in-place reinforced concrete cylindrical structures, and an outwardly convex concrete hoop is provided on the outside thereof. A reinforced concrete bottom plate is provided at the bottom of the abandoned rock cave, and the assembled lining body is placed above the reinforced concrete bottom plate.

[0008] A preferred technical solution of the present invention: Between adjacent concrete masonry sheets, there are multiple tie rod structures, and the distance between adjacent tie rod structures is 300 - 600 mm. The tie rod structure includes through holes correspondingly opened at the connecting parts of adjacent concrete masonry sheets and inclined tie rods inserted into the through holes. The through holes are inclined from the inner wall of the assembled lining body to the outer wall of the assembled lining body, and an internal fixed threaded sleeve is fixed on the side of the through hole adjacent to the outer wall of the assembled lining body. A tie rod plugging groove is opened at the orifice of the through hole adjacent to the inner wall of the assembled lining body. The inclined tie rod is inserted into the internal fixed threaded sleeve of the through hole from the side of the tie rod plugging groove and is fixed and locked in the tie rod plugging groove through a locking nut. After the inclined tie rod is fixed and locked, the tie rod plugging groove is plugged with high-strength mortar.

[0009] A preferred technical solution of the present invention: The energy storage cylinder is a welded and assembled stainless steel tank body, and an energy storage pipeline is welded at its end adjacent to the tunnel entrance. The heat insulation layer is an insulating board made of foam, which is wrapped on the outer surface of the energy storage cylinder, and the outer wall of the heat insulation layer is adhered to the inner wall of the assembled lining body with load-bearing adhesive.

[0010] A preferred technical solution of the present invention: The near-tunnel-entrance end sheet group includes a near-end base and two groups of near-end sheets connected end to end and placed above the near-end base. Both groups of near-end sheets are arc-shaped sheets, and a semi-circular groove is provided in the middle of the near-end base. Arc-shaped grooves are respectively provided in the middle of the two groups of near-end sheets. After the near-end base and the two groups of near-end sheets are assembled, the semi-circular grooves on the two groups of near-end sheets and the arc-shaped grooves in the middle of the two near-end sheets form a complete reserved pore channel. The far-tunnel-entrance end sheet group includes a far-end base and two groups of arc-shaped far-end sheets connected end to end from bottom to top. Between the sheets and the base of the near-tunnel-entrance end sheet group and the far-tunnel-entrance end sheet group, and between the sheets of the two groups, they are all connected through tie rod structures, and rectangular groove joints for restricting the outward displacement of the sheets are respectively provided at the connection parts. Elastic rubber water stop strips are provided at the splicing surfaces between the sheets and the base, between the sheets, and at the groove joints.

[0011] Preferred technical solution of the present invention: The standard joint section body group includes a standard joint base, standard joint side bodies, and a standard joint top body from bottom to top. The standard joint base is formed by splicing multiple sections of concrete bases provided with semi-circular grooves. The standard joint side bodies include two groups of arc-shaped side pieces symmetrically spliced above the standard joint base. The standard joint top body includes multiple arc-shaped pieces spliced on the top surfaces of the two groups of standard joint side bodies, and the standard joint side bodies are staggeredly spliced with the standard joint base and the standard joint top body; a concave table surface that matches each other is provided between the standard joint side bodies and the standard joint base, and a supporting body and a stepped joint for facilitating butt joint installation are provided between the standard joint side bodies and the standard joint top body; a tie rod structure is used to connect between the base and the bodies of the standard joint section body group and between adjacent bodies, and elastic rubber water stop strips are provided on the splicing surfaces between the bases, between the bases and the bodies, and between the bodies and the bodies; a cable is provided between two adjacent tie rod structures on both sides of the non-T-shaped joint between the standard joint side body and the standard joint base. The cable is arc-shaped, with threads at both ends, and both ends are fastened by nuts on the inner wall of the assembled lining main body; bolt grooves are respectively provided at the end positions of the cable. After both ends of the cable are fastened by nuts on the inner wall of the assembled lining main body, the bolt grooves are sealed with high-strength mortar. After compressed gas is added during the operation period, if only the tie rod structure is used to connect at the wider position of the connection joint of the standard joint section body of the assembled lining main body, an opening and flanging phenomenon will occur. Therefore, an arc-shaped cable with threads at both ends is provided between two adjacent tie rod structures on both sides of the non-T-shaped joint between the standard joint side body and the standard joint base as a supplementary connection structure for the diagonal tie rod, and the cable and the diagonal tie rod are arranged at intervals.

[0012] Preferred technical solution of the present invention: The assembled lining main body is correspondingly provided with prestressed tendon ducts, and the prestressed tendon ducts are respectively arranged at both ends of the base and are evenly distributed annularly around the inner cavity of the energy storage chamber; the prestressed tendon ducts horizontally penetrate through the entire assembled lining main body, and the tensioned prestressed tendons pass through the prestressed tendon ducts and are anchored at one end of the assembled lining main body adjacent to the hole by the prestressed tendon anchor head after being tensioned tightly; the assembled lining main body also includes two grouting ducts symmetrically arranged at the base of each section body group of the assembled lining main body. The grouting ducts obliquely lead from the inner wall of the assembled lining main body to its outer wall. After all the concrete masonry pieces are assembled and the prestressed tendons are tensioned, all the grouting ducts are connected at the same time and high-strength mortar is injected towards the outer wall of the assembled lining main body to form a high-strength mortar layer, and the valve at the connection head of the grouting duct is closed when the grouting pressure reaches the preset pressure value.

[0013] In order to achieve the technical purpose, the present invention also provides a construction method for an assembled lining type compressed gas energy storage chamber for abandoned rock caves, which is characterized in that the specific steps are as follows:

[0014] S1. Pre-construction treatment and construction of the preliminary consolidation layer: Select a portal-shaped abandoned mine adit with stable geology and controllable rock mass structural fissures. Remove the loose and irregular rock mass on the inner wall of the mine adit to make the rock surface smooth. Seal the fissures and conduct cavity grouting treatment. Spray a thin layer of mortar on the treated inner wall rock surface. Measure the size of the treated adit, determine the specifications of the concrete masonry pieces for assembling the lining body, and precast the concrete masonry pieces.

[0015] S2. Construction of the inner sealing structure and installation of prestressed tendons at the far end of the opening: Cut out multiple hoop grooves on the rock wall at the sealing end of the far opening, tie the steel bars of the inner sealing structure, position one end of multiple prestressed tendons into the steel bars of the inner sealing structure, and temporarily support the rest with brackets. Use the segmented and layered pouring method to complete the concrete pouring of the inner sealing structure and complete the curing work.

[0016] S3. Construction of the drainage structure laying in the area of the assembled lining body: Install horizontal drainage pipes and vertical drainage pipes wrapped with geotextiles on the rock surface of the assembled lining body section, and hang the mesh and formwork to pour permeable concrete. After curing, lay waterproof sheets on the surface to complete the drainage structure construction.

[0017] S4. Construction of the bottom drainage pipes and the bottom slab of the energy storage warehouse: Dig drainage pipe trenches at a distance of 500 - 1000 mm from the two side rock cavities on the adit floor, lay the drainage pipes, with the pipe diameter ≥ 200 mm and a slope of 2% - 5%. Excavate and place a water storage tank at the outlet end of the drainage pipe for later water collection and drainage. Connect the horizontal drainage pipes and vertical drainage pipes in step S3 with the drainage pipes on both sides. After completing the above work, carry out the reinforced concrete bottom slab pouring operation and control the unified bottom slab elevation.

[0018] S5. Construction of the far-end sheet group and standard section sheet group of the assembled lining body: Install the far-end sheet group and the standard section sheet group in sequence. When installing the sheets, pass through the prestressed tendons that have been erected. The connection between the sheets adopts a tie rod structure and a cable connection. Lay elastic rubber water stop strips at the joints between the sheets. After installation, use high-strength mortar to seal the nut grooves at the inner cavity ends of the tie rod structure and the cable.

[0019] S6. Construction of the insulation layer, energy storage cylinder and isolation layer: Lay polystyrene board insulation materials on the inner surface of the assembled assembled lining body. Then continue to lay the steel cylinder sheets of the energy storage cylinder fabricated in the welding factory, and weld the energy storage pipes at the air inlet and outlet of the energy storage cylinder. After completing the welding of the steel cylinder sheets, lay an isolation layer on the inner surface of the energy storage cylinder.

[0020] S7. Construction of the segment group at the near-entrance end of the assembled lining main body: Install the segment group at the near-entrance end. The connection between segments is made by a tie rod structure. Lay an elastic rubber water stop strip at the joint between segments. After installation, seal the nut grooves at the near-inner cavity ends of the tie rod structure and the cable with high-strength mortar, and complete the transition construction of materials.

[0021] S8. Tensioning construction of prestressed tendons: After completing the above work steps, use tensioning equipment to tension the prestressed tendons passing through the assembled lining main body. After tensioning, fix the ends and inject high-strength mortar into the prestressed tendon ducts. Then, connect all grouting ducts simultaneously and inject high-strength mortar into the gap between the outer wall of the assembled lining main body and the waterproof board.

[0022] S9. Construction of the outer sealing structure near the entrance: According to the construction process in step S2, cut out multiple hoop structure grooves in the chamber rock mass at the near-entrance sealing end according to the pressure-bearing requirements, tie the steel bars of the outer sealing structure, use a detachable steel sleeve to reserve a circular through-hole, and complete the concrete pouring and curing work by the segmented and layered pouring method.

[0023] S10. Extend the welded energy storage pipeline out of the adit entrance through the circular through-hole, and seal the gap between the energy storage pipeline and the through-hole with high-strength concrete to complete the construction of the energy storage reservoir.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) The construction structure of the present invention is applicable to existing abandoned mining rock caves with stable geology and controllable rock mass structural fissures. After the rock cave is preliminarily treated and reinforced, the main lining layer of the energy storage reservoir is assembled by splicing concrete masonry blocks. The length of the constructed energy storage reservoir can be achieved by freely increasing the number of intermediate standard segment blocks. The masonry blocks are customized in the factory, transported to the site for installation, achieving a modular assembly effect, reducing the construction difficulty, shortening the construction time, and the standardized construction can effectively control the construction quality.

[0026] (2) The energy storage reservoir in the present invention is built in an abandoned mine cave, and the outer dimensions of the segment of the assembled lining type compressed gas energy storage reservoir can be freely adjusted according to the shape and specifications of the abandoned mine cave, fitting the shape of the mine cave, making full use of the compressive capacity of the rock mass. While ensuring the quality of the energy storage reservoir, it reduces the influence of the external environment on the gas inside the energy storage reservoir and increases the pressure value of the gas that the energy storage reservoir can store.

[0027] (3) In the present invention, the assembled lining main body is assembled by staggering joints of three kinds of annular sheet bodies according to a certain rule, and then prestressed construction is carried out by the post-tensioning method to fasten the sheet bodies, improve the pressure-bearing capacity and integrity of the sheet bodies, ensure the construction quality of the lining main body, and the sealing performance of the present invention is borne by the energy storage cylinder and the air-blocking material. The lining only conducts pressure load transfer and partial sealing, so the assembled lining will not affect the sealing effect of the energy storage structure.

[0028] (4) The present invention also adds a micro-elastic sealing waterproof material between the sheet bodies of the three sheet body groups to enhance the buffering effect between the sheet bodies when bearing pressure changes, and at the same time play a water-stop effect, improve the service life of the energy storage reservoir, and reduce the problem of cracks in the masonry sheet bodies under periodic pressure changes.

[0029] (5) The construction of the energy storage reservoir in the present invention is carried out in abandoned mine tunnels, which can be used as strategic reserve resources with strong concealment and small floor area, difficult to detect from high altitude, and can be flexibly arranged according to the branch situation of the caverns. In the later stage, multiple caverns are combined to achieve a high upper limit of hydrogen storage capacity.

[0030] (6) The present invention is provided with an interlayer drainage structure outside the lining layer to avoid the water inflow of the cavern during the construction process and the seepage during subsequent processes such as assembling sheet bodies and buffer layer treatment. The bottom of the interlayer drainage structure is connected to the drainage pipeline laid at the bottom of the energy storage reservoir, and finally concentrated in the water storage pool outside the energy storage reservoir, which can be purified and used as industrial production water.

[0031] (7) The present invention is provided with a polyurethane foam insulation layer inside the water barrier layer to reduce the influence of the temperature change of the surrounding cavern rock wall on the gas in the energy storage reservoir in the previous compressed gas energy storage scheme, and improve the stability of the compressed gas energy storage reservoir.

[0032] The present invention realizes the construction of the gas energy storage reservoir by successively constructing the preliminary consolidation layer, the interlayer drainage structure, the plugging end, the assembled lining main body, the insulation layer, the energy storage cylinder, the isolation layer, and finally closing the cavern. Ultra-high performance concrete (UHPC) is used to make the lining sheet bodies, which reduces the influence of the external environment on the gas inside the energy storage reservoir while ensuring the quality of the energy storage reservoir; and the assembled + prestressed lining sheet bodies reduce the construction time, lower the construction difficulty, and increase the pressure value of the gas that the energy storage reservoir can store. Brief Description of the Drawings

[0033] Figure 1 is the cross-sectional view of the compressed gas energy storage reservoir of the present invention;

[0034] Figure 2 is the present invention Figure 1 in the A-A cross-sectional view;

[0035] Figure 3 is the layout diagram of the sheet bodies of the assembled lining main body of the present invention;

[0036] Figure 4 It is the connection diagram of the assembled lining main body sheet of the present invention;

[0037] Figure 5 It is the splicing diagram of the near-hole plugging end sheet of the present invention;

[0038] Figure 6 It is the splicing diagram of the far-hole plugging end sheet of the present invention;

[0039] Figure 7 It is the connection diagram of the diagonal tie rod of the middle standard section sheet of the present invention;

[0040] Figure 8 It is the cable connection diagram of the middle standard section sheet of the present invention;

[0041] Figure 9 It is of the present invention Figure 4 The enlarged view at position A in;

[0042] Figure 10 It is the interlayer drainage structure diagram of the present invention;

[0043] Figure 11 It is the diagonal tie rod diagram of the present invention;

[0044] Figure 12 It is the fastening structure diagram of the diagonal tie rod of the present invention;

[0045] Figure 13 It is the enlarged schematic diagram of the drainage structure in the present invention.

[0046] In the figure: 1 - chamber rock mass, 2 - preliminary consolidation layer, 3 - drainage structure, 301 - vertical drain pipe, 302 - horizontal drain pipe, 303 - drainage pipeline, 304 - reservoir, 305 - permeable concrete layer, 4 - internal plugging structure, 401 - hoop structure, 5 - assembled lining main body, 501 - near-end base, 502 - near-end sheet, 503 - far-end base, 504 - far-end sheet, 505 - standard section base, 506 - standard section side sheet, 507 - standard section top sheet, 508 - concave table surface, 509 - step joint, 6 - tie rod structure, 601 - diagonal tie rod, 602 - lock nut, 603 - tie rod plugging groove, 604 - internal thread fastening sleeve, 605 - square end, 7 - external plugging structure, 700 - circular through hole, 8 - groove joint, 9 - elastic sealing waterproof material, 10 - grouting hole, 11 - reserved hole, 12 - energy storage pipeline, 13 - prestressed tendon hole, 14 - tensioned prestressed tendon, 1401 - prestressed tendon anchor head, 15 - insulation layer, 16 - energy storage cylinder, 17 - isolation layer, 18 - energy storage cylinder inner cavity, 19 - cable, 20 - reinforced concrete floor, 21 - high-strength mortar layer, 22 - waterproof board. Specific embodiments

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The Figures 1 to 13 accompanying drawings are all for the embodiments, and are drawn in a simplified manner, only for clearly and concisely illustrating the purpose of the embodiments of the present invention. The technical solutions shown in the accompanying drawings below are the specific solutions of the embodiments of the present invention, and are not intended to limit the scope of the present invention to be protected. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invention is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, terms such as "arrangement" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] An assembled lining type compressed gas energy storage reservoir for abandoned rock caves is provided in an embodiment of the present invention, such as Figure 1As shown in the figure, it includes an abandoned rock cavern 1 and a energy storage structure placed inside the abandoned rock cavern. The abandoned rock cavern 1 is a deep horizontal tunnel. The energy storage structure includes an inner sealing structure 4 at the end far from the entrance of the rock cavern 1, an outer sealing structure 7 near the entrance of the rock cavern 1, and an energy storage reservoir placed between the inner sealing structure 4 and the outer sealing structure 7. The energy storage reservoir successively includes a preliminary consolidation layer 2, a drainage structure 3, an assembled lining main body 5, a heat insulation layer 15, an energy storage cylinder 16, and an isolation layer 17 from the outside to the inside. The preliminary consolidation layer 2 is constructed on the inner wall of the annular chamber rock mass 1, which needs to be carried out after the irregular block stones and cracks on the inner wall of the long tunnel chamber are processed. After the irregular block stones and cracks on the inner wall of the deep horizontal tunnel are processed, cavity grouting is carried out, and a reinforced layer is formed by spraying concrete. The outer sealing structure 7 is arranged at the part of the assembled lining main body 5 close to the entrance, and the inner sealing structure 4 is arranged at the end of the assembled lining main body 5 far from the entrance. Both the inner sealing structure 4 and the outer sealing structure 7 are cast-in-place reinforced concrete cylindrical structures, and there is a convex concrete hoop 401 on their outer sides. Calculated according to the pressure-bearing situation at the location, the inner sealing structure 4 and the outer sealing structure 7 are supplementary structures for insufficient pressure-bearing at the far end of the deep horizontal tunnel. There is a reinforced concrete floor slab 20 at the bottom of the abandoned rock cavern 1, and the assembled lining main body 5 is placed above the reinforced concrete floor slab 20.

[0051] In the embodiment of the present invention, an assembled lining type compressed gas energy storage reservoir for an abandoned rock cavern is provided. The drainage structure 3 is used to timely drain the water around the energy storage reservoir to prevent the hydrostatic pressure from acting on the energy storage reservoir. As Figure 2 , Figure 10 and Figure 13 shown, the drainage structure 3 includes a vertical drain pipe 301, a horizontal drain pipe 302, a drainage pipeline 303, and a reservoir 304. Both the vertical drain pipe 301 and the horizontal drain pipe 302 adopt corrugated pipes with a diameter of ≥100 mm and holes punched at the top. A permeable geotextile is wrapped around the outside of each pipe body, and it is covered on the outer surface of the assembled lining main body 5 every 500 - 1000 mm horizontally and vertically. Two horizontal drain pipes 302 are symmetrically arranged in a V shape on both sides of each vertical drain pipe 301. The slope of the horizontal drain pipe 302 is 2% - 5%, and there are water collecting holes on the side far from the assembled lining main body 5 for water collection; there is a permeable concrete layer 305 outside the horizontal drain pipe 302 and the vertical drain pipe 301; the drainage pipeline 303 is laid at the bottom of both ends of the energy storage reservoir. The vertical drain pipe 301 and the horizontal drain pipe 302 are connected to the drainage pipeline 303 and lead to the reservoir 304 outside the energy storage reservoir through the drainage pipeline 303. The horizontal drain pipe 302 and the vertical drain pipe 301 collect the water and gather it into the drainage pipeline 303, and then it is discharged into the reservoir 304 outside the energy storage reservoir through the drainage pipeline 303; there is a waterproof board 22 between the drainage structure 3 and the high-strength mortar layer 21, and the assembled lining main body 5 is waterproofed through the waterproof board 22.

[0052] In an embodiment of the present invention, a prefabricated lining type compressed gas energy storage reservoir for abandoned rock caverns is provided, as Figure 1 and Figure 2 shown. The prefabricated lining main body 5 is assembled by concrete masonry pieces made of ultra-high performance concrete (UHPC), and its outer cross-section is a columnar structure in the shape of a city gate. Its energy storage cavity is a capsule-like structure with spherical ends and a circular cross-section in the middle. The energy storage cylinder 16 is a steel cylinder, and its shape matches the capsule-shaped energy storage cavity inside the prefabricated lining main body 5. The energy storage cylinder 16 is placed inside the energy storage cavity, and an insulating layer 15 is wrapped outside it. The insulating layer 15 is an insulating board made of foam and is adhered to the inner wall of the prefabricated lining main body 5 with a load-bearing adhesive to ensure that the internal gas temperature of the energy storage reservoir is not affected by the external environment within the designed service life, and the evaporation rate will be maintained within an acceptable limit. The insulating layer 15 can also provide a certain bearing capacity and airtightness. An isolation layer 17 is provided on the inner wall of the energy storage cylinder 16, and the isolation layer 17 is closely attached to the inner wall of the energy storage cylinder 16, which is determined according to the type and characteristics of the gas to be stored. A reserved hole 11 is provided at one end of the prefabricated lining main body 5 adjacent to the cave entrance. A circular through hole 700 is provided at the position of the outer sealing structure 7 corresponding to the reserved hole 11. An energy storage pipeline 12 is provided on the energy storage cylinder 16, and the energy storage pipeline 12 extends out of the outer sealing structure 7 through the reserved hole 11 and the circular through hole 700. The circular through hole 700 can also be used as a temporary construction passage for the cavity of the gas storage reservoir and a layout passage for various pipelines. After the construction is completed and various pipelines are inserted, it is sealed by secondary pouring of high-strength concrete with a strength level one higher than that of the concrete at the sealing end.

[0053] A prefabricated lining type compressed gas energy storage reservoir for abandoned rock caverns provided in the embodiment, as Figure 3 and Figure 4 shown. The concrete masonry pieces of the prefabricated lining main body 5 include a near-cave-entrance end piece group, a far-cave-entrance end piece group, and a standard section piece group in the middle. The near-cave-entrance end piece group is spliced into a near-cave-entrance end lining structure with a hemispherical inner surface, and a reserved hole 11 is provided in the middle of the near-cave-entrance end lining structure. The far-cave-entrance end pieces are spliced into a far-cave-entrance end masonry structure with a closed hemispherical inner surface. The standard section piece group in the middle is spliced into a middle section masonry structure with a cylindrical inner cavity. The concrete masonry pieces of the prefabricated lining main body 5 are spliced by a T-shaped staggered joint splicing method, and the spliced concrete masonry pieces are fastened by tensioned prestressing tendons 14. Adjacent two concrete masonry pieces are connected by a plurality of tie rod structures 6, and the distance between adjacent two tie rod structures 6 is 300 - 600 mm; as Figure 11 and Figure 12As shown, the tie rod structure 6 includes through holes correspondingly opened at the connecting parts of adjacent concrete masonry sheets and inclined tie rods 601 inserted into the through holes. The through holes are inclined from the inner wall of the assembled lining main body 5 to the outer wall of the assembled lining main body 5, and an internal fixed thread sleeve 604 is fixed on the side of the through hole adjacent to the outer wall of the assembled lining main body 5. A tie rod plugging groove 603 is opened at the orifice of the through hole adjacent to the inner wall of the assembled lining main body 5. The inclined tie rod 601 is inserted into the internal fixed thread sleeve 604 of the through hole from the side of the tie rod plugging groove 603 and is fixed and locked in the tie rod plugging groove 603 through a locking nut 602. The inclined tie rod 601 is a threaded rod, with a nut end at the end near the inner cavity 18 of the energy storage cylinder and a square end 605 at the other end. It is clamped by a hand-held electric wrench and rotated into the internal thread fastening sleeve 604. The end near the inner cavity 18 of the energy storage cylinder is fixed by a locking nut 602. After the fixation is completed and the torque is verified, the tie rod groove 603 is blocked with high-strength mortar.

[0054] An assembled lining type compressed gas energy storage reservoir for abandoned rock caves provided in the embodiment, as Figure 5 and Figure 6 As shown, the near-orifice end sheet group includes a near-end base 501 and two groups of near-end sheets 502 connected end to end and placed above the near-end base 501. Both groups of near-end sheets 502 are arc-shaped sheets, and a semi-circular groove is provided in the middle of the near-end base 501. Arc-shaped grooves are respectively provided in the middle of the two groups of near-end sheets 502. After the near-end base 501 and the two groups of near-end sheets 502 are assembled, the semi-circular grooves on the two groups of near-end sheets 502 and the arc-shaped grooves in the middle of the two near-end sheets 502 form a complete reserved pore channel 11. The far-orifice end sheet group includes a far-end base 503 and two groups of arc-shaped far-end sheets 504 connected end to end from bottom to top. The sheets and the bases of the near-orifice end sheet group and the far-orifice end sheet group, and between the sheets are all connected by a tie rod structure 6, and rectangular groove joints 8 for restricting the outward displacement of the sheet body are respectively provided at the connecting parts. Elastic rubber water stop strips 9 are provided at the splicing surfaces of the sheet body and the base, the splicing surfaces of the sheet body and the sheet body, and the groove joints 8.

[0055] An assembled lining type compressed gas energy storage reservoir for abandoned rock caves provided in the embodiment, as Figure 7 and Figure 8As shown, the standard section body group includes a standard section base 505, a standard section side body 506, and a standard section top body 507 from bottom to top. The standard section base 505 is formed by splicing multiple sections of concrete bases provided with semi-circular grooves. The standard section side body 506 includes two groups of arc-shaped side pieces symmetrically spliced above the standard section base 505. The standard section top body 507 includes multiple arc-shaped pieces spliced on the top surfaces of the two groups of standard section side bodies 506, and the standard section side body 506 is staggeredly spliced with the standard section base 505 and the standard section top body 507; a concave table surface 508 that matches each other is provided between the standard section side body 506 and the standard section base 505, and a supporting piece body and a step joint 509 that facilitate butt joint installation are provided between the standard section side body 506 and the standard section top body 507; a tie rod structure 6 is used between the base and the body of the standard section body group and between adjacent bodies, and elastic rubber water stop strips 9 are provided on the splicing surfaces between the base and the base, between the base and the body, and between the body and the body.

[0056] After adding compressed gas during the operation period, if only the tie rod structure 6 is used to connect the standard section body segments of the assembled lining main body 5 at the relatively wide positions of the connection joints, an opening and warping phenomenon will occur. Therefore, in the embodiment, an arc-shaped cable 19 with threads at both ends is arranged between the adjacent tie rod structures 6 on both sides of the non-T-shaped seam between the standard section side body 506 and the standard section base 505, as Figure 7 shown. Bolt grooves are respectively provided at the end positions of the cable 19. After the two ends of the cable 19 are fastened by nuts on the inner wall of the assembled lining main body 5, the bolt grooves are blocked by high-strength mortar.

[0057] The construction process of the compressed gas energy storage library in the present invention will be further described below in conjunction with specific embodiments. The embodiment is a hydrogen storage library structure with a diameter of 9m, adopting the above-mentioned assembled lining structure. The specific construction steps are as follows:

[0058] Step 1. Pre-construction treatment and construction of the preliminary consolidation layer 2: Select an abandoned mine adit with stable geology and controllable rock mass structural fissures (the commonly used portal adit development method in general mine exploitation); remove the loose and irregular rock masses to keep the rock surface smooth; seal the fissures, and if cavities are encountered, grouting treatment is used, and then the treated rock surface is sprayed with mortar for protection; measure the dimensions of the treated adit, determine the body specifications, and submit them to the factory for processing.

[0059] Step 2. Construction of the inner plugging structure 4 and installation of prestressed tendons at the far end of the adit: After step S1 is completed, a plurality of hoop grooves are cut on the rock wall at the plugging end position of the far end of the adit, the steel bars of the inner plugging structure 4 are tied, the positioning installation of 10 prestressed tendons is completed, one end of the 10 prestressed tendons is positioned and embedded in the inner plugging structure steel bars, and temporary support is adopted by using brackets. The concrete pouring of the plugging end 402 at the far end of the adit is completed by using the segmented and layered pouring method, and the curing work is completed.

[0060] Step 3. Construction of the drainage structure laying in the main body area of the assembled lining: After the completion of Step S2, install the horizontal drain pipe 302 wrapped with geotextile and the vertical drain pipe 301 on the rock surface of the main body section of the assembled lining, hang the mesh and spray permeable concrete, level the inner surface of the permeable concrete and then install the waterproof board 22 to complete the construction of the external drainage structure of the energy storage reservoir, and then lay polyurethane foam as the thermal insulation layer 15;

[0061] Step 4. Construction of the drainage pipe and the bottom slab at the bottom of the energy storage reservoir: After the completion of Step S3, excavate the trench of the drain pipe 303 at a distance of 500 - 1000 mm from both rock cavities on the ground of the adit, lay the drain pipe 303, the pipe diameter ≥ 200 mm and slope at 2% - 5% for drainage, and excavate the outlet end of the drain pipe 303 to place the reservoir 304 for later water collection and drainage; after the above work is completed, carry out the pouring operation of the reinforced concrete bottom slab 22 and strictly control the unification of the bottom slab elevation;

[0062] Step 5. Construction of the far - hole - end sheet group and the standard - section sheet group of the assembled lining: Install the far - hole - end sheet group and the standard - section sheet group in sequence. When installing the sheets, pass through the prestressed tendons that have been erected. The connection between the sheets adopts a tie - rod structure and a cable connection. When installing the sheets, pass through the prestressed tendons that have been erected. Lay elastic rubber water - stop strips at the joints between the sheets, and after installation, seal the nut grooves at the near - inner - cavity ends of the tie - rod structure and the cable with high - strength mortar;

[0063] Step 6. Construction of the thermal insulation layer, energy storage cylinder and isolation layer: Lay polystyrene - type thermal insulation materials on the surface of the assembled sheets; then continue to lay the steel cylinder sheets of the energy storage cylinder fabricated in the factory by welding, and weld the energy storage pipes at the air inlet and outlet of the energy storage cylinder. After the welding of the steel cylinder sheets is completed, lay the isolation layer 17 on its inner surface, and select a polymer - film - type gas - barrier material with low permeability and good gas - blocking effect according to the specific gas stored and fix it;

[0064] Step 7. Construction of the near - hole - end sheet group of the assembled lining: After the completion of Step S6, install the near - hole - end sheet group. The connection between the sheets adopts a tie - rod structure connection. Lay elastic rubber water - stop strips at the joints between the sheets, and after installation, seal the nut grooves at the near - inner - cavity ends of the tie - rod structure and the cable with high - strength mortar, and do a good job in the transition construction of materials;

[0065] Step 8. Prestressed tendon tensioning construction: After the completion of the above work steps, use the tensioning equipment to tension the prestressed tendons passing through the sheets. After the tensioning is completed, fix the ends and inject high - strength mortar into the prestressed tendon ducts 13 for treatment, and then connect all the grouting ducts at the same time to inject high - strength mortar into the gap between the outer wall of the assembled lining and the waterproof board;

[0066] Step 9: Construction of the external plugging structure near the tunnel entrance: Referring to Step S2, cut out multiple hoop structure grooves in the chamber rock mass at the plugging end near the tunnel entrance according to the pressure-bearing requirements, tie the steel bars of the external plugging structure, use a detachable steel sleeve to reserve a circular through-hole, and complete the concrete pouring and curing work by using the segmented and layered pouring method;

[0067] Step 10: Extend the welded energy storage pipeline 12 out of the adit entrance through the circular through-hole 700, and seal the gap between the energy storage pipeline 12 and the through-hole 700 by pouring high-strength concrete to complete the construction of the energy storage reservoir.

[0068] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. An assembled lining type compressed gas energy storage library for abandoned rock caverns, comprising an abandoned rock cavern (1) and an energy storage structure placed inside the abandoned rock cavern, characterized in that: The energy storage structure includes an inner plugging structure (4) away from the opening end of the rock cave (1), an outer plugging structure (7) adjacent to the opening end of the rock cave (1), and an energy storage chamber disposed between the inner plugging structure (4) and the outer plugging structure (7). The energy storage chamber sequentially includes a preliminary consolidation layer (2), a drainage structure (3), an assembled lining main body (5), a heat insulation layer (15), and an energy storage cylinder (16) from outside to inside. The preliminary consolidation layer (2) is constructed on the inner wall of the annular chamber rock mass of the rock cave (1). The assembled lining main body (5) is assembled by using ultra-high performance concrete masonry sheets, and an energy storage cavity matching the outer wall of the energy storage cylinder (16) is formed inside. The adjacent two concrete masonry sheets of the assembled lining main body (5) are connected by a tie rod structure (6). The energy storage cylinder (16) is disposed in the energy storage cavity, and an isolation layer (17) is provided on the inner wall of the energy storage cylinder (16). One end of the assembled lining main body (5) adjacent to the opening is provided with a reserved pore passage (11), and a circular through pore passage (700) is provided at the position of the outer plugging structure (7) corresponding to the reserved pore passage (11). An energy storage pipeline (12) is provided on the energy storage cylinder (16), and the energy storage pipeline (12) extends out of the outer plugging structure (7) through the reserved pore passage (11) and the circular through pore passage (700). The drainage structure (3) includes a vertical drainage pipe (301), a horizontal drainage pipe (302), a drainage pipeline (303), and a water storage tank (304). The vertical drainage pipe (301) and the horizontal drainage pipe (302) are both corrugated pipes with a diameter of ≥100 mm and punched at the top. A permeable geotextile is wrapped outside each pipe body, and the outer surface of the assembled lining main body (5) is covered horizontally and vertically every 500 - 1000 mm. Two horizontal drainage pipes (302) are symmetrically arranged in a V shape on both sides of each vertical drainage pipe (301). The slope of the horizontal drainage pipe (302) is 2% - 5%, and water collecting holes are opened on the side away from the assembled lining main body (5). A permeable concrete layer (305) is provided on the outer periphery of the horizontal drainage pipe (302) and the vertical drainage pipe (301). The drainage pipeline (303) is laid at the bottoms of both ends of the energy storage chamber. The vertical drainage pipe (301) and the horizontal drainage pipe (302) are communicated with the drainage pipeline (303) and lead to the water storage tank (304) outside the energy storage chamber through the drainage pipeline (303). A high-strength mortar layer (21) and a waterproof board (22) are provided between the drainage structure (3) and the assembled lining main body (5), and the waterproof board (22) is adjacent to the drainage structure (3).

2. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 1, characterized in that: The assembled lining body (5) is a columnar structure with a gate-shaped cross-section, and its energy storage cavity is a capsule-like structure with spherical ends and a circular cross-section in the middle. The isolation layer (17) is closely attached to the inner wall of the energy storage cylinder (16). The concrete masonry pieces of the assembled lining body (5) include a near-hole-end piece group, a far-hole-end piece group, and a standard section piece group in the middle. The near-hole-end piece group is spliced into a near-hole-end lining structure with a hemispherical inner surface, and a reserved duct (11) is provided in the middle of the near-hole-end lining structure. The far-hole-end pieces are spliced into a far-hole-end masonry structure with a closed hemispherical inner surface, and the standard section piece group in the middle is spliced into a middle-section masonry structure with a cylindrical inner cavity. The concrete masonry pieces of the assembled lining body (5) are spliced by a T-shaped staggered joint splicing method, and the spliced concrete masonry pieces are fastened by tensioned prestressed tendons (14).

3. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 1 or 2, characterized in that: The abandoned rock cave (1) is a deep horizontal tunnel. The preliminary consolidation layer (2) is a reinforcement layer formed by grouting the cavity after treating the irregular block stones and cracks on the inner wall of the deep horizontal tunnel and spraying concrete. The outer plugging structure (7) is arranged at the part of the assembled lining body (5) close to the hole, and the inner plugging structure (4) is arranged at the far-hole end of the assembled lining body (5). Both the inner plugging structure (4) and the outer plugging structure (7) are cast-in-place reinforced concrete cylindrical structures, and an outwardly protruding concrete hoop (401) is provided on the outside. A reinforced concrete bottom slab (20) is provided at the bottom of the abandoned rock cave (1), and the assembled lining body (5) is placed above the reinforced concrete bottom slab (20).

4. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 1 or 2, characterized in that: Adjacent two concrete masonry pieces are connected by a plurality of tie rod structures (6), and the distance between adjacent two tie rod structures (6) is 300 - 600 mm. The tie rod structure (6) includes through holes correspondingly opened at the connection parts of adjacent concrete masonry pieces and inclined tie rods (601) inserted into the through holes. The through holes are inclined from the inner wall of the assembled lining body (5) to the outer wall of the assembled lining body (5), and an inner fixed threaded sleeve (604) is fixed on the side of the through hole adjacent to the outer wall of the assembled lining body (5). A tie rod plugging groove (603) is opened at the orifice of the through hole adjacent to the inner wall of the assembled lining body (5). The inclined tie rod (601) is inserted into the inner fixed threaded sleeve (604) of the through hole from the side of the tie rod plugging groove (603) and is fixed and locked in the tie rod plugging groove (603) by a locking nut (602). After the inclined tie rod (601) is fixed and locked, the tie rod plugging groove (603) is plugged with high-strength mortar.

5. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 1 or 2, characterized in that: The energy storage cylinder (16) is a welded and assembled stainless steel tank body, and an energy storage pipeline (12) is welded to its near-hole end. The heat preservation layer (15) is an insulating board made of foam, which is wrapped on the outer surface of the energy storage cylinder (16), and the outer wall of the heat preservation layer (15) is adhered to the inner wall of the assembled lining body (5) by a load-bearing adhesive.

6. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 2, characterized in that: The near-tunnel-opening end-piece group includes a near-tunnel-opening base (501) and two sets of near-tunnel-opening pieces (502) connected end to end and placed above the near-tunnel-opening base (501). Both sets of near-tunnel-opening pieces (502) are arc-shaped pieces, and a semi-circular groove is provided in the middle of the near-tunnel-opening base (501). Arc-shaped grooves are respectively provided in the middle of the two sets of near-tunnel-opening pieces (502). After the near-tunnel-opening base (501) and the two sets of near-tunnel-opening pieces (502) are assembled, the semi-circular grooves on the two sets of near-tunnel-opening pieces (502) and the arc-shaped grooves in the middle of the two near-tunnel-opening pieces (502) form a complete reserved pore channel (11). The far-tunnel-opening end-piece group includes a far-tunnel-opening base (503) and two sets of arc-shaped far-tunnel-opening pieces (504) connected end to end from bottom to top. Between the pieces and the bases of the near-tunnel-opening end-piece group and the far-tunnel-opening end-piece group, and between the pieces and the pieces, they are all connected by a tie-rod structure (6), and rectangular groove joints (8) for restricting the outward displacement of the pieces are respectively provided at the connection parts. Elastic rubber water-stop strips (9) are provided at the splicing surfaces between the pieces and the bases, between the pieces and the pieces, and at the groove joints (8).

7. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 2, characterized in that: The standard-section piece group includes a standard-section base (505), a standard-section side piece (506), and a standard-section top piece (507) from bottom to top. The standard-section base (505) is formed by splicing multiple sections of concrete bases provided with semi-circular grooves. The standard-section side piece (506) includes two sets of arc-shaped side pieces symmetrically spliced above the standard-section base (505). The standard-section top piece (507) includes multiple arc-shaped pieces spliced on the top surfaces of the two sets of standard-section side pieces (506), and the standard-section side piece (506) is spliced with the standard-section base (505) and the standard-section top piece (507) with staggered joints. A matching concave table surface (508) is provided between the standard-section side piece (506) and the standard-section base (505). A supporting piece and a step joint (509) convenient for butt joint installation are provided between the standard-section side piece (506) and the standard-section top piece (507). Between the base and the pieces of the standard-section piece group, and between adjacent pieces, they are all connected by a tie-rod structure (6), and elastic rubber water-stop strips (9) are provided at the splicing surfaces between the bases and the bases, between the bases and the pieces, and between the pieces and the pieces. A cable (19) is provided between two adjacent tie-rod structures (6) on both sides of the non-T-shaped joint between the standard-section side piece (506) and the standard-section base (505). The cable (19) is arc-shaped, with threads at both ends, and both ends are fastened by nuts on the inner wall of the assembled lining body (5). Bolt grooves are respectively provided at the end positions of the cable (19). After the two ends of the cable (19) are fastened by nuts on the inner wall of the assembled lining body (5), the bolt grooves are sealed with high-strength mortar.

8. The assembled lining type compressed gas energy storage library for abandoned rock caverns according to claim 6 or 7, characterized in that: The assembled lining body (5) is correspondingly provided with prestressed tendon ducts (13), and the prestressed tendon ducts (13) are respectively arranged at both ends of the base and are evenly distributed in a ring around the inner cavity (18) of the energy storage chamber; the prestressed tendon ducts (13) horizontally penetrate through the entire assembled lining body (5), and the tensioned prestressed tendons (14) pass through the prestressed tendon ducts (13) and are anchored at one end of the assembled lining body (5) adjacent to the tunnel opening through the prestressed tendon anchor heads (1401) after being tensioned tightly; the assembled lining body (5) further includes two grouting ducts (10) symmetrically arranged at the base of each sheet group of the assembled lining body (5), and the grouting ducts (10) obliquely lead from the inner wall of the assembled lining body (5) to its outer wall. After completing the assembly construction of all concrete masonry sheets and tensioning the prestressed tendons (14), all the grouting ducts (10) are connected at the same time, and high-strength mortar is injected towards the outer wall of the assembled lining body (5) to form a high-strength mortar layer (21). When the grouting pressure reaches the preset pressure value, the valve at the connection of the grouting duct is closed.

9. A construction method for the assembled lining type compressed gas energy storage library for abandoned rock caverns according to any one of claims 1 to 8, characterized in that The specific steps are as follows: S1. Pretreatment before construction and construction of the preliminary consolidation layer: Select a portal-type abandoned mine adit with stable geology and controllable rock mass structural fissures, remove the loose and irregular rock masses on the inner wall of the mine adit to make the rock surface smooth; seal the fissures and conduct cavity grouting treatment, and spray a thin layer of mortar on the treated inner wall rock surface for protection; measure the size of the treated adit, determine the specifications of the concrete masonry sheets of the assembled lining body, and precast the concrete masonry sheets. S2. Construction of the inner plugging structure and installation of prestressed tendons at the far tunnel opening: Cut out multiple hoop grooves on the rock wall at the plugging end position of the far tunnel opening, bind the steel bars of the inner plugging structure, position and embed one end of multiple prestressed tendons into the steel bars of the inner plugging structure, and use brackets for temporary support at other positions. Complete the concrete pouring of the inner plugging structure by the segmented and layered pouring method and complete the curing work. S3. Construction of the drainage structure laying in the area of the assembled lining body: Install horizontal drainage pipes and vertical drainage pipes wrapped with geotextiles on the rock surface in the section of the assembled lining body, and hang the mesh and formwork to pour permeable concrete. After curing, lay a waterproof board on the surface to complete the construction of the drainage structure. S4. Construction of the drainage pipes and the bottom slab at the bottom of the energy storage chamber: Dig drainage pipe trenches at a distance of 500 - 1000 mm from the two rock cavities on the floor of the adit, lay the drainage pipes, with the pipe diameter ≥ 200 mm and a slope of 2% - 5%. Excavate and place a water storage tank at the outlet end of the drainage pipe for later water collection and drainage, and connect the horizontal drainage pipes and vertical drainage pipes in step S3 with the drainage pipes on both sides. After completing the above work, carry out the pouring operation of the reinforced concrete bottom slab and control the unified elevation of the bottom slab. S5. Construction of the far - entrance - end sheet group and standard - section sheet group of the assembled lining main body: Install the far - entrance - end sheet group and standard - section sheet group in sequence. When installing the sheets, they pass through the pre - installed prestressed tendons. The connection between sheets adopts a tie - rod structure and cable connection. An elastic rubber water - stop strip is laid at the joint between sheets. After installation, the nut grooves at the inner - cavity ends of the tie - rod structure and cable are sealed with high - strength mortar. S6. Construction of the thermal insulation layer, energy - storage cylinder and isolation layer: Lay polystyrene - type thermal insulation materials on the inner surface of the assembled lining main body after assembly; then continue to lay the steel cylinder sheets of the energy - storage cylinder fabricated in the welding factory, and weld the energy - storage pipelines at the air inlet and outlet of the energy - storage cylinder. After completing the welding of the steel cylinder sheets, lay the isolation layer on the inner surface of the energy - storage cylinder. S7. Construction of the near - entrance - end sheet group of the assembled lining main body: Install the near - entrance - end sheet group. The connection between sheets adopts a tie - rod structure connection. An elastic rubber water - stop strip is laid at the joint between sheets. After installation, the nut grooves at the inner - cavity ends of the tie - rod structure and cable are sealed with high - strength mortar, and the transition construction of materials is carried out. S8. Prestressed tendon tensioning construction: After completing the above work steps, use tensioning equipment to tension the prestressed tendons passing through the assembled lining main body. After tensioning, fix the end heads and inject high - strength mortar into the prestressed tendon ducts; then connect all the grouting ducts at the same time and inject high - strength mortar into the gap between the outer wall of the assembled lining main body and the waterproof board. S9. Construction of the outer sealing structure near the entrance: According to the construction process in Step S2, cut out multiple hoop - structure grooves in the chamber rock mass at the near - entrance sealing end according to the pressure - bearing requirements, bind the steel bars of the outer sealing structure, use a detachable steel sleeve to reserve a circular through - hole duct, and complete the concrete pouring and curing work by the segmented and layered pouring method. S10. Extend the welded energy - storage pipeline out of the adit entrance through the circular through - hole duct, and seal the gap between the energy - storage pipeline and the through - hole duct by pouring high - strength concrete to complete the construction of the energy - storage reservoir.

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