Underground gas storage chamber structure for compressed air energy storage and construction method thereof

Abstract

The application discloses an underground gas storage chamber structure for compressed air energy storage and a construction method thereof. The underground gas storage chamber structure comprises a gas storage chamber body, a strain monitoring mechanism and a dynamic adjusting mechanism. The gas storage chamber body comprises a concrete lining and a plurality of prestressed tendons. The strain monitoring mechanism comprises a plurality of strain gauges. The dynamic adjusting mechanism comprises a plurality of stress balance tendons and a tensioning mechanism. The application has the beneficial effects that: by simultaneously arranging prestressed tendons and adjustable stress balance tendons in the concrete lining, the axial tensile performance of the concrete lining is strengthened, thereby comprehensively improving the tensile performance of the gas storage chamber; meanwhile, the tensioning mechanism is used for adjusting the tension of the stress balance tendons in real time, so as to cope with the axial tensile stress under different operation stages and conditions, thereby effectively reducing or avoiding the generation of axial cracks, and significantly improving the overall structural stability and sealing performance of the gas storage chamber.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, specifically to an underground gas storage chamber structure for compressed air energy storage and its construction method. Background Technology

[0002] Compressed air energy storage (CASS) is a new technology that uses compressed air as a medium to store surplus electrical energy. Its main function is to regulate peak and off-peak electricity demand and improve power quality. Its working principle is as follows: during off-peak hours, surplus electricity from the grid drives an air compressor to compress air to a high-pressure state and store it in an underground cavern. During peak hours, the high-pressure air is released, mixed with a small amount of gaseous fuel, and then burned and expanded in a gas turbine to drive a generator. The underground gas storage facility, as a crucial component of a CASS power station, is a key technology for ensuring its operational performance and reliability. Currently, the geological structures suitable for underground CASS storage are mainly divided into three categories: ① artificially karstified salt caverns; ② porous rock media in aquifers; ③ artificially excavated underground caverns in hard rock. Because the first two types require relatively special geological conditions, in areas with abundant wind resources but lacking special geological structures, artificially excavated underground caverns in hard rock become the most feasible underground gas storage solution.

[0003] Sealing technology is one of the core technologies for the safe and stable operation of compressed air energy storage artificial chambers. Artificial chambers typically employ a flexible sealing structure design. The purpose is to fully utilize the bearing capacity of the surrounding rock while ensuring the sealing structure only performs its sealing function and does not directly bear the internal pressure. Through this design, the sealing layer of the gas storage facility can achieve gas sealing more efficiently, thereby ensuring the long-term stable operation of the gas storage facility under high internal pressure conditions.

[0004] Cracking of plain concrete linings is a common phenomenon under high internal pressure cyclic loading. This is because the mechanical properties of concrete itself are insufficient to completely resist the high internal pressure and its periodic changes within the gas storage facility. Therefore, the design of the lining allows for a certain amount of cracks, as long as the size and distribution of the cracks are within a controllable range, they will not significantly affect the lining's ability to transmit internal pressure. Thus, from the perspective of overall force transmission, the existence of cracks is acceptable.

[0005] However, from the perspective of local stress and sealing performance, excessive or wide lining cracks can adversely affect the sealing structure of the gas storage facility. First, cracks can directly lead to the failure of the flexible sealing layer. Under high internal pressure, the flexible sealing layer may be squeezed into the lining cracks, resulting in damage and functional failure. Second, lining cracks can also trigger a series of mechanical problems. For example, when the crack width is too large or the number of cracks is too high, local stress concentration may occur in the sealing layer. Under cyclic loading, this stress concentration may further lead to local plastic deformation of the sealing layer, or even buckling failure. Furthermore, after the lining cracks, groundwater may seep through the cracks to the outer surface of the sealing layer, increasing local water pressure. This added water pressure will further exacerbate the uneven stress distribution in the sealing layer, significantly increasing the risk of damage and failure.

[0006] To address the aforementioned issues, existing technologies typically employ circumferential prestressing tendons to apply circumferential prestress to the lining. Circumferential prestressing can significantly improve the circumferential tensile strength of the lining, thereby effectively reducing the occurrence of circumferential cracks. However, circumferential prestressing design only addresses circumferential tensile forces; existing technologies have not yet proposed an effective solution for cracking caused by axial tension during gas storage facility operation. Therefore, relying solely on circumferential prestressing tendons is insufficient to fully guarantee the sealing performance of a gas storage facility. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an underground gas storage chamber structure and its construction method for compressed air energy storage, thereby solving the technical problem of cracking of concrete lining in existing compressed air energy storage artificial chambers due to axial tension under high internal pressure conditions.

[0008] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0009] This invention provides an underground gas storage chamber structure for compressed air energy storage, comprising:

[0010] The main body of the gas storage chamber includes a concrete lining and several prestressed tendons. The concrete lining is cylindrical and has a gas storage cavity inside. Several first channels and second channels parallel to the axial direction of the concrete lining are evenly opened along the circumference of the concrete lining. Each prestressed tendon corresponds to one of the first channels, and each prestressed tendon is in a tensioned state and is fixedly embedded in the corresponding first channel.

[0011] A strain monitoring mechanism, comprising a plurality of strain gauges evenly arranged on the outer side wall of the concrete lining, for measuring the axial strain at various points along the concrete lining; and,

[0012] A dynamic adjustment mechanism includes several stress balancing tendons and a tensioning mechanism; each stress balancing tendon corresponds to a second channel, and each stress balancing tendon is in a tensioned state and inserted into the corresponding second channel; the tensioning mechanism is connected to each stress balancing tendon and is used to adjust the tension of each stress balancing tendon according to the axial strain of the concrete lining.

[0013] In some embodiments, the main body of the gas storage chamber further includes a first concrete plug and a second concrete plug, which are respectively fixed to both ends of the concrete lining. The first concrete plug has a plurality of first through holes communicating with the first channel and a plurality of second through holes communicating with the second channel. The second concrete plug has a plurality of third through holes communicating with the first channel and a plurality of fourth through holes communicating with the second channel. One end of each prestressed tendon is fixedly embedded in the corresponding first through hole, and the other end of each prestressed tendon is fixedly embedded in the corresponding third through hole.

[0014] In some embodiments, the first perforation, the second perforation, the third perforation, and the fourth perforation are all curved holes.

[0015] In some embodiments, one end of each stress balancing rib is fixedly embedded in the corresponding second perforation, and the other end of each stress balancing rib passes through the corresponding fourth perforation and extends to the outside of the second concrete plug.

[0016] The tensioning mechanism includes a first fixed plate, a second fixed plate, several sliding rods, several sliding sleeves, sliding blocks, nuts, screws, and a rotation drive component. The first fixed plate is fixed to the second concrete plug. One end of each sliding rod is fixedly connected to the first fixed plate, and the other end of each sliding rod is fixedly connected to the second fixed plate. Each sliding sleeve is slidably disposed on its corresponding sliding rod. Each sliding block is fixedly connected to each sliding sleeve. The other end of each stress balance reinforcement is fixed to the sliding block. Each sliding block has a mounting hole, and the nut is fixed in the mounting hole. The screw is rotatably connected to both the first fixed plate and the second fixed plate, and the screw is threaded into the nut. The rotation drive component is connected to the screw and is used to drive the screw to rotate.

[0017] In some embodiments, the rotation drive includes a rotation drive motor, a drive gear, and a driven gear. The housing of the rotation drive motor is fixed to the second fixed plate. The drive gear is coaxially fixed to the output shaft of the rotation drive motor. The driven gear is coaxially fixed to the screw. The driven gear meshes with the drive gear.

[0018] In some embodiments, the tensioning mechanism further includes a first bearing and a second bearing, wherein the inner ring of the first bearing is fixedly sleeved on the screw, the outer ring of the first bearing is fixedly connected to the first fixing plate, the inner ring of the second bearing is fixedly sleeved on the screw, and the outer ring of the second bearing is fixedly connected to the second fixing plate.

[0019] In some embodiments, the first fixing plate has a plurality of clearance holes for the stress balancing ribs to pass through.

[0020] In some embodiments, the main body of the gas storage chamber further includes a sliding layer, a sealing layer, and a buffer layer. The sliding layer is disposed on the inner side wall of the concrete lining, the sealing layer is disposed on the inner side wall of the sliding layer, and the buffer layer is disposed between the outer side wall of the concrete lining and the surrounding rock. Drainage holes are provided in the buffer layer.

[0021] In some embodiments, both the first concrete plug and the second concrete plug are wedge-shaped concrete plugs.

[0022] The present invention also provides a construction method for an underground gas storage chamber structure for compressed air energy storage, comprising:

[0023] Step 1: Design the axial prestressed lining structure;

[0024] Step 2: Excavate the surrounding rock according to the axial prestressed lining structure design;

[0025] Step 3: Concrete lining construction shall be carried out in accordance with the axial prestressed lining structure design. During the concrete lining construction, several first ducts and several second ducts shall be reserved.

[0026] Step 4: After the concrete lining is installed, several strain gauges are evenly arranged on the outer side wall of the concrete lining. Then, each prestressing tendon is passed through the reserved first channel. One end of the prestressing tendon is fixed, and the other end is subjected to a preset prestress through the tensioning device. Then, the other end of the prestressing tendon is fixed, and grouting is performed through each first channel to make the prestressing tendon and the first channel tightly bonded.

[0027] Step 5: Pass each stress balancing tendon through the reserved second hole, fix one end of the stress balancing tendon, and connect the other end to the tensioning mechanism;

[0028] Step 6: In the subsequent production process, the tensioning mechanism adjusts the tension of each stress balance bar according to the axial strain of the concrete lining.

[0029] Compared with existing technologies, the beneficial effects of the underground gas storage chamber structure and construction method for compressed air energy storage provided by this invention are as follows: By simultaneously setting prestressed tendons and adjustable stress balancing tendons within the concrete lining, the axial tensile strength of the concrete lining is enhanced, thereby comprehensively improving the tensile performance of the gas storage chamber. Simultaneously, considering the large pressure fluctuations characteristic of underground gas storage chambers, the strain monitoring mechanism, through strain gauges uniformly arranged on the outer wall of the concrete lining, can monitor the axial strain of the concrete lining in real time, providing accurate data support for dynamic adjustment. Based on the data provided by the strain monitoring mechanism, the dynamic adjustment mechanism adjusts the tension of the stress balancing tendons in real time through the tensioning mechanism to cope with axial tensile stress under different operating stages and conditions, thereby effectively reducing or avoiding the generation of axial cracks, significantly improving the overall structural stability and sealing performance of the gas storage chamber. This is of great significance for ensuring the safe operation of underground compressed air energy storage chambers during long-term, high-pressure, and frequent filling and releasing processes. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an underground gas storage chamber structure for compressed air energy storage provided in an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 Sectional view of section AA;

[0032] Figure 3 yes Figure 2 The underground gas storage chamber structure for compressed air energy storage in the image is shown after omitting the prestressed tendons;

[0033] Figure 4 yes Figure 3 A magnified view of a portion of region C in the middle;

[0034] Figure 5 yes Figure 1 Sectional view of the middle section BB;

[0035] Figure 6 yes Figure 5 A schematic diagram of the dynamic adjustment mechanism in the diagram;

[0036] Explanation of reference numerals in the attached drawings: 1-Main body of the gas storage chamber, 11-Concrete lining, 111-First duct, 112-Second duct, 12-Prestressed tendon, 13-First concrete plug, 131-First perforation, 14-Second concrete plug, 141-Third perforation, 142-Channel, 15-Sliding layer, 16-Sealing layer, 17-Buffer layer, 171-Drainage hole, 2-Strain monitoring mechanism, 21-Strain gauge, 3-Dynamic adjustment mechanism, 31-Stress balance tendon, 32-Tensioning mechanism, 321-First fixing plate, 322-Second fixing plate, 323-Sliding rod, 324-Sliding sleeve, 325-Sliding block, 326-Nut, 327-Screw, 3271-First bearing, 3272-Second bearing, 328-Rotation drive component, 3281-Rotation drive motor, 3282-Driving gear, 3283-Driven gear. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] To address the technical problem of cracking of concrete lining in existing compressed air energy storage chambers due to axial tension under high internal pressure, this invention provides an underground gas storage chamber structure and its construction method for compressed air energy storage, which can significantly improve the overall sealing performance and structural stability of the gas storage chamber.

[0039] Please see Figures 1-6 , Figure 1 This is a schematic diagram of an underground gas storage chamber structure for compressed air energy storage according to an embodiment of the present invention. The underground gas storage chamber structure for compressed air energy storage includes a main body 1 of the gas storage chamber, a strain monitoring mechanism 2, and a dynamic adjustment mechanism 3.

[0040] The main body 1 of the gas storage chamber includes a concrete lining 11 and a plurality of prestressed tendons 12. The concrete lining 11 is cylindrical and has a gas storage cavity inside. A plurality of first channels 111 and second channels 112 parallel to the axial direction of the concrete lining 11 are evenly opened along the circumference of the concrete lining 11. The prestressed tendons 12 correspond one-to-one with the first channels 111. Each prestressed tendon 12 is in a tensioned state and is fixedly embedded in the corresponding first channel 111.

[0041] The strain monitoring mechanism 2 includes a plurality of strain gauges 21, each strain gauge 21 being evenly arranged on the outer side wall of the concrete lining 11 and used to measure the axial strain at various points of the concrete lining 11.

[0042] The dynamic adjustment mechanism 3 includes a plurality of stress balancing tendons 31 and a tensioning mechanism 32. Each stress balancing tendon 31 corresponds one-to-one with a second channel 112. Each stress balancing tendon 31 is in a tensioned state and inserted into its corresponding second channel 112. The tensioning mechanism 32 is connected to each stress balancing tendon 31 and is used to adjust the tension of each stress balancing tendon 31 according to the axial strain of the concrete lining 11. It should be understood that the greater the tension of the stress balancing tendon 31, the greater the axial pressure exerted by the stress balancing tendon 31 on the concrete lining 11; conversely, the smaller the tension of the stress balancing tendon 31, the smaller the axial pressure exerted by the stress balancing tendon 31 on the concrete lining 11.

[0043] This invention enhances the axial tensile strength of the concrete lining by simultaneously incorporating prestressed tendons and adjustable stress balancing tendons, thereby comprehensively improving the tensile performance of the gas storage facility. Furthermore, addressing the large pressure fluctuations characteristic of underground gas storage facilities, the strain monitoring mechanism 2, using strain gauges 21 uniformly distributed on the outer wall of the concrete lining, can monitor the axial strain of the concrete lining in real time, providing precise data support for dynamic adjustment. Based on the data provided by the strain monitoring mechanism 2, the dynamic adjustment mechanism 3 adjusts the tension of the stress balancing tendons 31 in real time via the tensioning mechanism 32 to cope with axial tensile stress under different operating stages and conditions, effectively reducing or avoiding the generation of axial cracks. This significantly improves the overall structural stability and sealing performance of the gas storage facility, which is of great significance for ensuring the safe operation of underground compressed air energy storage chambers during long-term, high-pressure, and frequent filling and releasing processes.

[0044] In one embodiment, please refer to Figures 1-4The main body 1 of the gas storage chamber includes a concrete lining 11 and a plurality of prestressed tendons 12. The concrete lining 11 is cylindrical and has a gas storage cavity inside. A plurality of first channels 111 and second channels 112, parallel to the axial direction of the concrete lining 11, are evenly distributed along its circumference inside the concrete lining 11. In this embodiment, there are four first channels 111 and four second channels 112, and the first channels 111 and second channels 112 are arranged at intervals to ensure the uniformity of their distribution in the circumferential direction. Each prestressed tendon 12 corresponds one-to-one with a first channel 111, and each prestressed tendon 12 is in a tensioned state and fixedly embedded in the corresponding first channel 111. The main body 1 of the gas storage chamber also includes a first concrete plug 13 and a second concrete plug 14, which are respectively fixed to both ends of the concrete lining 11. The first concrete plug 13 has several first through holes 131 communicating with the first channel 111 and several second through holes communicating with the second channel 112. The second concrete plug 14 has several third through holes 141 communicating with the first channel 111 and several fourth through holes communicating with the second channel 112. One end of each prestressed tendon 12 is fixedly embedded in the corresponding first through hole 131, and the other end is fixedly embedded in the corresponding third through hole 141.

[0045] In one embodiment, please refer to Figures 1-4 The second concrete plug 14 is also provided with a channel 142. One end of the channel 142 is connected to the air storage chamber, and the other end of the channel 142 is connected to an external inflation device to realize the connection between the air storage chamber and the outside.

[0046] In one embodiment, please refer to Figures 1-4 The first perforation 131, the second perforation 131, the third perforation 141, and the fourth perforation are all curved holes. Because the first perforation 131 and the third perforation 141 are curved holes, the friction between the prestressing tendon 12 and the first perforation 131 and the third perforation 141 will increase, thereby improving the bonding strength between the prestressing tendon 12 and each plug. Because the second perforation 131 and the fourth perforation are curved holes, the contact area between the stress balancing tendon 31 and each plug will be larger, thus facilitating the stress balancing tendon 31 to better apply pressure to each plug.

[0047] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6Each stress balancing tendon 31 has one end fixedly embedded in its corresponding second through hole, and the other end passes through its corresponding fourth through hole and extends to the outside of the second concrete plug 14. The tensioning mechanism 32 includes a first fixing plate 321, a second fixing plate 322, several sliding rods 323, several sliding sleeves 324, sliding blocks 325, nuts 326, screws 327, and a rotation drive component 328. The first fixing plate 321 is fixed to the second concrete plug 14. One end of each sliding rod 323 is fixedly connected to the first fixing plate 321, and the other end is fixedly connected to the second fixing plate 322. Each sliding sleeve 324 is slidably disposed on its corresponding sliding rod 323, and each sliding block 325 is fixedly connected to each sliding sleeve 324. The other end of each stress balancing tendon 31 is fixed to the sliding block 325. The sliding block 325 has a mounting hole, and the nut 326 is fixed in the mounting hole. The screw 327 is rotatably connected to both the first fixing plate 321 and the second fixing plate 322, and is threaded into the nut 326. The rotation drive 328 is connected to the screw 327 and is used to drive the screw 327 to rotate, thereby adjusting the tension of the sliding block 325 and the stress balance ribs 31. When the axial stress of the concrete lining 11 increases, the stress of each stress balance rib 31 can increase accordingly, thereby achieving dynamic balance of the axial stress on the concrete lining 11 inside and outside, and improving the structural stability of the concrete lining 11. The advantage of using a screw and nut to move the sliding block is that the screw and nut have self-locking characteristics. Therefore, the rotation drive 328 does not need to be in an output state at all times. It only needs to drive the screw 327 to rotate when it is necessary to adjust the tension of the stress balance ribs 31. At the same time, in order to increase the pressure bearing capacity, multiple sets of screws and nuts can be used.

[0048] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The rotation drive component 328 includes a rotation drive motor 3281, a drive gear 3282, and a driven gear 3283. The housing of the rotation drive motor 3281 is fixed to the second fixed plate 322. The drive gear 3282 is coaxially fixed to the output shaft of the rotation drive motor 3281. The driven gear 3283 is coaxially fixed to the screw 327 and meshes with the drive gear 3282. In use, the rotation drive motor 3281 sequentially drives the drive gear 3282, the driven gear 3283, and the screw 327 to rotate, thereby moving the sliding block 325. When the sliding block 325 moves away from the second concrete plug 14, the tension of each stress balance rib 31 increases, and vice versa.

[0049] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6The tensioning mechanism 32 also includes a first bearing 3271 and a second bearing 3272. The inner ring of the first bearing 3271 is fixedly sleeved on the screw 327, and the outer ring is fixedly connected to the first fixed plate 321. Similarly, the inner ring of the second bearing 3272 is fixedly sleeved on the screw 327, and the outer ring is fixedly connected to the second fixed plate 322.

[0050] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The first fixing plate 321 has several clearance holes for the force balance rib 31 to pass through, so as to ensure that the stress balance rib 31 can pass through smoothly and be fixed on the sliding block 325. The first fixing plate 321 also has clearance holes coaxially arranged with the channel 142, thereby providing space for the connection between the external inflation device and the channel 142.

[0051] In one embodiment, please refer to Figures 1-3 The main body 1 of the gas storage chamber also includes a sliding layer 15, a sealing layer 16, and a buffer layer 17. The sliding layer 15 is disposed on the inner wall of the concrete lining 11 to reduce friction between the lining and the gas storage medium. The sealing layer 16 is disposed on the inner wall of the sliding layer 15 to improve the sealing performance of the gas storage chamber. The buffer layer 17 is disposed between the outer wall of the concrete lining 11 and the surrounding rock to absorb and disperse the pressure of the surrounding rock on the lining. Drainage holes 171 are provided in the buffer layer 17 to remove groundwater and other moisture that may affect the stability of the gas storage chamber.

[0052] In one embodiment, please refer to Figures 1-3 Both the first concrete plug 13 and the second concrete plug 14 are wedge-shaped concrete plugs.

[0053] The present invention also provides a construction method for an underground gas storage chamber structure for compressed air energy storage, comprising:

[0054] Step 1: Design the axial prestressed lining structure;

[0055] Step 2: Excavate the surrounding rock according to the axial prestressed lining structure design;

[0056] Step 3: Buffer layer construction. The construction quality of the inner wall of the buffer layer is controlled according to the standard design cross-sectional dimensions. Construction methods such as wire mesh spraying and formwork casting can be used. It is required to have certain structural strength, toughness, and sealing performance. The gap between the buffer layer and the lining can be filled by the wall-mounted grouting method to ensure direct adhesion and load transfer between the two.

[0057] Step 4: Concrete lining construction shall be carried out in accordance with the axial prestressed lining structure design. During the concrete lining construction, several first ducts 111 and several second ducts 112 shall be reserved.

[0058] Step 5: After the concrete lining 11 is installed, several strain gauges 21 are evenly arranged on the outer wall of the concrete lining 11. Then, each prestressing tendon 12 is passed through the pre-reserved first duct 111. One end of the prestressing tendon 12 is fixed, and the other end is subjected to a preset prestress through a tensioning device. The other end of the prestressing tendon 12 is then fixed, and grouting is performed through each first duct 111 to ensure a tight bond between the prestressing tendon 12 and the first duct 111. A sliding layer is then laid on the inner surface of the concrete lining to reduce friction between the sealing layer and the lining, thus reducing the impact of deformation on the sealing layer. Subsequently, a sealing layer is laid on the inner surface of the sliding layer.

[0059] Step 6: Pass each stress balancing tendon 31 through the reserved second hole 112, fix one end of the stress balancing tendon 31, and connect the other end to the tensioning mechanism 32;

[0060] Step 7: In the subsequent production process, the tensioning mechanism 32 adjusts the tension of each stress balance rib 31 by driving the screw 327 to rotate by rotating the drive motor 3281 according to the axial strain of the concrete lining 11 (for example, it can be characterized by the average strain of each strain gauge), thereby adjusting the pressure applied to the concrete lining 11.

[0061] This invention enhances the axial tensile strength of the concrete lining by simultaneously incorporating prestressed tendons and adjustable stress balancing tendons, thereby comprehensively improving the tensile performance of the gas storage facility. Furthermore, addressing the large pressure fluctuations characteristic of underground gas storage facilities, the strain monitoring mechanism 2, using strain gauges 21 uniformly distributed on the outer wall of the concrete lining, can monitor the axial strain of the concrete lining in real time, providing precise data support for dynamic adjustment. Based on the data provided by the strain monitoring mechanism 2, the dynamic adjustment mechanism 3 adjusts the tension of the stress balancing tendons 31 in real time via the tensioning mechanism 32 to cope with axial tensile stress under different operating stages and conditions, effectively reducing or avoiding the generation of axial cracks. This significantly improves the overall structural stability and sealing performance of the gas storage facility, which is of great significance for ensuring the safe operation of underground compressed air energy storage chambers during long-term, high-pressure, and frequent filling and releasing processes.

[0062] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An underground gas storage chamber structure for compressed air energy storage, characterized in that, include: The main body of the gas storage chamber includes a concrete lining and several prestressed tendons. The concrete lining is cylindrical and has a gas storage cavity inside. Several first channels and second channels parallel to the axial direction of the concrete lining are evenly opened along the circumference of the concrete lining. Each prestressed tendon corresponds to one of the first channels, and each prestressed tendon is in a tensioned state and is fixedly embedded in the corresponding first channel. A strain monitoring mechanism, comprising a plurality of strain gauges evenly arranged on the outer side wall of the concrete lining, for measuring the axial strain at various points along the concrete lining; and, A dynamic adjustment mechanism includes several stress balancing tendons and a tensioning mechanism; each stress balancing tendon corresponds to a second channel, and each stress balancing tendon is in a tensioned state and inserted into the corresponding second channel; the tensioning mechanism is connected to each stress balancing tendon and is used to adjust the tension of each stress balancing tendon according to the axial strain of the concrete lining during the operation of the gas storage tank.

2. The underground gas storage chamber structure for compressed air energy storage according to claim 1, characterized in that, The main body of the gas storage chamber also includes a first concrete plug and a second concrete plug. The first concrete plug and the second concrete plug are respectively fixed to both ends of the concrete lining. The first concrete plug has a plurality of first through holes communicating with the first channel and a plurality of second through holes communicating with the second channel. The second concrete plug has a plurality of third through holes communicating with the first channel and a plurality of fourth through holes communicating with the second channel. One end of each prestressed tendon is fixedly embedded in the corresponding first through hole, and the other end of each prestressed tendon is fixedly embedded in the corresponding third through hole.

3. The underground gas storage chamber structure for compressed air energy storage according to claim 2, characterized in that, The first perforation, the second perforation, the third perforation, and the fourth perforation are all curved holes.

4. The underground gas storage chamber structure for compressed air energy storage according to claim 2, characterized in that, One end of each stress balancing bar is fixedly embedded in the corresponding second through hole, and the other end of each stress balancing bar passes through the corresponding fourth through hole and extends to the outside of the second concrete plug. The tensioning mechanism includes a first fixed plate, a second fixed plate, several sliding rods, several sliding sleeves, sliding blocks, nuts, screws, and a rotation drive component. The first fixed plate is fixed to the second concrete plug. One end of each sliding rod is fixedly connected to the first fixed plate, and the other end of each sliding rod is fixedly connected to the second fixed plate. Each sliding sleeve is slidably disposed on its corresponding sliding rod. Each sliding block is fixedly connected to each sliding sleeve. The other end of each stress balance reinforcement is fixed to the sliding block. Each sliding block has a mounting hole, and the nut is fixed in the mounting hole. The screw is rotatably connected to both the first fixed plate and the second fixed plate, and the screw is threaded into the nut. The rotation drive component is connected to the screw and is used to drive the screw to rotate.

5. The underground gas storage chamber structure for compressed air energy storage according to claim 4, characterized in that, The rotation drive component includes a rotation drive motor, a drive gear, and a driven gear. The housing of the rotation drive motor is fixed to the second fixed plate. The drive gear is coaxially fixed to the output shaft of the rotation drive motor. The driven gear is coaxially fixed to the screw. The driven gear meshes with the drive gear.

6. The underground gas storage chamber structure for compressed air energy storage according to claim 4, characterized in that, The tensioning mechanism further includes a first bearing and a second bearing. The inner ring of the first bearing is fixedly sleeved on the screw, and the outer ring of the first bearing is fixedly connected to the first fixed plate. The inner ring of the second bearing is fixedly sleeved on the screw, and the outer ring of the second bearing is fixedly connected to the second fixed plate.

7. The underground gas storage chamber structure for compressed air energy storage according to claim 4, characterized in that, The first fixing plate has several clearance holes for the stress balancing ribs to pass through.

8. The underground gas storage chamber structure for compressed air energy storage according to claim 1, characterized in that, The main body of the gas storage chamber also includes a sliding layer, a sealing layer and a buffer layer. The sliding layer is disposed on the inner side wall of the concrete lining, the sealing layer is disposed on the inner side wall of the sliding layer, and the buffer layer is disposed between the outer side wall of the concrete lining and the surrounding rock. Drainage holes are provided in the buffer layer.

9. The underground gas storage chamber structure for compressed air energy storage according to claim 2, characterized in that, Both the first concrete plug and the second concrete plug are wedge-shaped concrete plugs.

10. The construction method of the underground gas storage chamber structure for compressed air energy storage according to any one of claims 1-9, characterized in that, include: Step 1: Design the axial prestressed lining structure; Step 2: Excavate the surrounding rock according to the axial prestressed lining structure design; Step 3: Concrete lining construction shall be carried out in accordance with the axial prestressed lining structure design. During the concrete lining construction, several first ducts and several second ducts shall be reserved. Step 4: After the concrete lining is installed, several strain gauges are evenly arranged on the outer side wall of the concrete lining. Then, each prestressing tendon is passed through the reserved first channel. One end of the prestressing tendon is fixed, and the other end is subjected to a preset prestress through the tensioning device. Then, the other end of the prestressing tendon is fixed, and grouting is performed through each first channel to make the prestressing tendon and the first channel tightly bonded. Step 5: Pass each stress balancing tendon through the reserved second hole, fix one end of the stress balancing tendon, and connect the other end to the tensioning mechanism; Step 6: In the subsequent production process, the tensioning mechanism adjusts the tension of each stress balance bar according to the axial strain of the concrete lining.

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