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

Abstract

The invention discloses an underground gas storage chamber structure for compressed air energy storage and a construction method of the underground gas storage chamber structure. 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 ribs and a tensioning mechanism. The method has the beneficial effects that the prestressed ribs and the adjustable stress balance ribs are arranged in the concrete lining at the same time, the axial tensile property of the concrete lining is enhanced, and therefore the tensile property of the gas storage is comprehensively improved; and meanwhile, the tension of the stress balance rib is adjusted in real time through the tensioning mechanism so as to cope with the axial tensile stress in different operation stages and conditions, so that the generation of axial cracks is effectively reduced or avoided, and the overall structural stability and sealing performance of the gas storage are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to an underground air storage chamber structure for compressed air energy storage and a construction method thereof. Background Art

[0002] Compressed air energy storage is a new technology that uses compressed air as a medium to store surplus electric energy. Its main function is to regulate power peaks and valleys and improve power quality. Its working principle is to use the excess electric energy in the power grid to drive the air compressor during low power consumption, compress the air to a high-pressure state and store it in an underground cavern; during peak power consumption, the high-pressure air is released and mixed with a small amount of gas fuel, and then burned and expanded in the gas turbine to drive the generator to generate electricity. As an important part of the compressed air energy storage power station, the underground gas storage is the key technology to ensure its operating performance and reliability. At present, the geological structures of underground gas storage suitable for compressed air energy storage are mainly divided into three categories: ① artificially dissolved salt rock cavity; ② porous medium rock in aquifer; ③ artificially excavated underground caverns in hard rock. Since the first two methods require relatively special geological conditions, in areas with rich wind resources but no special geological structures, artificially excavated underground chambers in hard rock have become the most feasible underground gas storage solutions.

[0003] Sealing technology is one of the core technologies for the safe and stable operation of compressed air energy storage artificial chambers. Artificial chambers usually adopt a flexible sealing structure design, the purpose of which is to give full play to the bearing capacity of the surrounding rock while making the sealing structure only bear the sealing function without directly bearing the internal pressure. Through this design, the sealing layer of the gas storage reservoir can achieve gas sealing more efficiently, thereby ensuring the long-term stable operation of the gas storage reservoir under high internal pressure conditions.

[0004] Under high internal pressure cyclic load, cracking of plain concrete lining is a common phenomenon. This is because the mechanical properties of concrete material itself cannot fully resist the high internal pressure and its cyclic changes inside the gas storage reservoir. For this reason, the design of the lining allows certain cracks to exist. As long as the size and distribution of the cracks are within a controllable range, they will not have a significant impact on the lining's normal function of transmitting internal pressure. Therefore, from the perspective of overall force transmission, the existence of cracks is acceptable.

[0005] However, from the perspective of local stress and sealing performance, too many or too wide lining cracks may have an adverse effect on the sealing structure of the gas storage. First, cracks may directly lead to the failure of the flexible sealing layer. Under the action of high internal pressure, the flexible sealing layer may be squeezed into the lining cracks, resulting in damage and functional failure of the sealing layer. Secondly, lining cracks will also cause a series of mechanical problems. For example, when the crack width is too large or the number is too large, local stress concentration may occur in the sealing layer. Under cyclic loads, this stress concentration may further lead to local plastic deformation of the sealing layer, and even buckling failure. In addition, after the lining cracks, groundwater may penetrate through the cracks to the outer surface of the sealing layer, increasing the local water pressure. This external water pressure will further aggravate the uneven stress of the sealing layer, significantly increasing the risk of damage and failure of the sealing layer.

[0006] In order to solve the above problems, the prior art usually uses annular prestressed tendons to apply annular prestress to the lining. The annular prestress can significantly improve the annular tensile performance of the lining, thereby effectively reducing the occurrence of annular cracks. However, the annular prestress design can only be used for the annular tensile effect. For the crack problem caused by axial tension during the operation of the gas storage, the prior art has not yet proposed an effective solution. Therefore, relying solely on annular prestressed tendons is not enough to fully guarantee the sealing performance of the gas storage. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose an underground gas storage chamber structure for compressed air energy storage and a construction method thereof, and solve the technical problem of cracking of the concrete lining in the artificial chamber gas storage reservoir for compressed air energy storage in the prior art due to axial stretching under high internal pressure conditions.

[0008] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

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

[0010] The main body of the gas storage chamber comprises a concrete lining and a plurality of prestressed tendons. The concrete lining is cylindrical and has a gas storage cavity therein. The concrete lining is provided with a plurality of first channels and second channels parallel to the axial direction of the concrete lining evenly along the circumference of the concrete lining. The prestressed tendons correspond to the first channels one by one, and each of the prestressed tendons is in a tensioned state and is fixedly embedded in the corresponding first channel.

[0011] A strain monitoring mechanism, the strain monitoring mechanism comprising a plurality of strain gauges, each of which is evenly arranged on the outer side wall of the concrete lining and is used to measure the amount of strain at each location of the concrete lining along the axial direction; and

[0012] A dynamic adjustment mechanism, the dynamic adjustment mechanism includes a plurality of stress-balancing bars and a tensioning mechanism; the stress-balancing bars correspond one-to-one to the second channels, each of the stress-balancing bars is in a tensioning state and is inserted into the corresponding second channel, the tensioning mechanism is connected to each of the stress-balancing bars, and is used to adjust the tension of each of the stress-balancing bars according to the axial strain of the concrete lining.

[0013] In some embodiments, the gas storage chamber body also includes a first concrete plug and a second concrete plug, the first concrete plug and the second concrete plug are respectively fixed at both ends of the concrete lining, the first concrete plug is provided with a plurality of first through-holes connected to the first channel and a plurality of second through-holes connected to the second channel, the second concrete plug is provided with a plurality of third through-holes connected to the first channel and a plurality of fourth through-holes connected to the second channel, one end of each of the prestressed tendons is fixedly embedded in the corresponding first through-hole, and the other end of each of the prestressed tendons is fixedly embedded in the corresponding third through-hole.

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

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

[0016] The tensioning mechanism includes a first fixed plate, a second fixed plate, a plurality of sliding rods, a plurality of sliding sleeves, a sliding block, a nut, a screw and a rotation driving member, the first fixed plate is fixed to the second concrete plug, one end of each of the sliding rods is fixedly connected to the first fixed plate, the other end of each of the sliding rods is fixedly connected to the second fixed plate, each of the sliding sleeves is slidably arranged on the corresponding sliding rod, the sliding block is fixedly connected to each of the sliding sleeves, the other end of each of the stress balancing ribs is fixed to the sliding block, a mounting hole is provided on the sliding block, the nut is fixed in the mounting hole, the screw is rotationally connected to the first fixed plate and the second fixed plate, the screw thread is inserted in the nut, and the rotation driving member is connected to the screw and is used to drive the screw to rotate.

[0017] In some embodiments, the rotary driving member includes a rotary driving motor, a driving gear and a driven gear, the housing of the rotary driving motor is fixed to the second fixed plate, the driving gear is coaxially fixed to the output shaft of the rotary driving motor, the driven gear is coaxially fixed to the screw, and the driven gear is meshed with the driving gear.

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

[0019] In some embodiments, the first fixing plate is provided with a plurality of avoidance holes for the stress-balancing ribs to pass through.

[0020] In some embodiments, the gas storage chamber body also includes a sliding layer, a sealing layer and a buffer layer, the sliding layer is arranged on the inner wall of the concrete lining, the sealing layer is arranged on the inner wall of the sliding layer, the buffer layer is arranged between the outer wall of the concrete lining and the surrounding rock, and drainage holes are opened in the buffer layer.

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

[0022] The present invention also provides a construction method of 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 design of the axial prestressed lining structure;

[0025] Step 3: Carry out concrete lining construction according to the axial prestressed lining structure design, and reserve a number of first channels and a number of second channels during the concrete lining construction;

[0026] Step 4: After the concrete lining is installed, a number of strain gauges are evenly arranged on the outer wall of the concrete lining, and then each prestressed tendon is passed through the reserved first hole, one end of the prestressed tendon is fixed, and the other end is applied with a preset prestress through a tensioning device, and then the other end of the prestressed tendon is fixed, and then grouting treatment is performed through each first hole, so that the prestressed tendon is tightly combined with the first hole;

[0027] Step 5: Pass each stress-balancing rib through the reserved second hole, fix one end of the stress-balancing rib, 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-balancing reinforcement according to the axial strain of the concrete lining.

[0029] Compared with the prior art, the underground gas storage chamber structure and construction method for compressed air energy storage provided by the present invention have the following beneficial effects: by simultaneously arranging prestressed tendons and adjustable stress balance tendons in the concrete lining, the axial tensile resistance of the concrete lining is strengthened, thereby comprehensively improving the tensile resistance of the gas storage reservoir; at the same time, in view of the large pressure change amplitude of the underground gas storage reservoir, the strain monitoring mechanism can monitor the axial strain of the concrete lining in real time through the strain gauges evenly arranged on the outer wall of the concrete lining, providing accurate data support for dynamic adjustment. The dynamic adjustment mechanism adjusts the tension of the stress balance tendons in real time through the tensioning mechanism according to the data provided by the strain monitoring mechanism to cope with the 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 reservoir, and is of great significance for ensuring the safe operation of the underground gas storage chamber for compressed air energy storage during long-term, high-pressure, and frequent filling and discharging processes. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0032] Figure 3 yes Figure 2 The underground gas storage chamber structure for compressed air energy storage in which the prestressed tendons are omitted;

[0033] Figure 4 yes Figure 3 A partial enlarged view of the middle area C;

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

[0035] Figure 6 yes Figure 5 A schematic diagram of the structure of the dynamic regulating mechanism;

[0036] Explanation of the reference numerals: 1-gas storage chamber body, 11-concrete lining, 111-first channel, 112-second channel, 12-prestressed tendons, 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 tendons, 32-tensioning mechanism, 321-first fixed plate, 322-second fixed plate, 323-sliding rod, 324-sliding sleeve, 325-sliding block, 326-nut, 327-screw, 3271-first bearing, 3272-second bearing, 328-rotating drive member, 3281-rotating drive motor, 3282-driving gear, 3283-driven gear. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In order to solve the technical problem of cracking of concrete lining in artificial cavernous gas storage reservoirs for compressed air energy storage due to axial stretching under high internal pressure conditions in the prior art, the present invention provides an underground gas storage chamber structure for compressed air energy storage and a construction method thereof, which can significantly improve the overall sealing performance and structural stability of the gas storage reservoir.

[0039] See also Figure 1-Figure 6 , Figure 1 It is a structural schematic diagram of an underground gas storage chamber structure for compressed air energy storage in one embodiment of the present invention. The underground gas storage chamber structure for compressed air energy storage includes a gas storage chamber body 1, a strain monitoring mechanism 2 and a dynamic adjustment mechanism 3.

[0040] The gas storage chamber body 1 includes a concrete lining 11 and a plurality of prestressed tendons 12. The concrete lining 11 is cylindrical and has an air storage cavity therein. The concrete lining 11 has a plurality of first channels 111 and second channels 112 parallel to the axial direction of the concrete lining 11 uniformly opened along the circumference of the concrete lining. The prestressed tendons 12 correspond one-to-one to the first channels 111, and each of the prestressed tendons 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 of the strain gauges 21 is evenly arranged on the outer wall of the concrete lining 11 and is used to measure the axial strain amount of each location of the concrete lining 11 .

[0042] The dynamic adjustment mechanism 3 includes a plurality of stress balancing ribs 31 and a tensioning mechanism 32; the stress balancing ribs 31 correspond to the second channels 112 one by one, each of the stress balancing ribs 31 is in a tensioning state and inserted into the corresponding second channels 112, and the tensioning mechanism 32 is connected to each of the stress balancing ribs 31 and is used to adjust the tension of each of the stress balancing ribs 31 according to the axial strain of the concrete lining 11. It should be understood that the greater the tension of the stress balancing ribs 31, the greater the axial pressure applied by the stress balancing ribs 31 to the concrete lining 11, and conversely, the smaller the tension of the stress balancing ribs 31, the smaller the axial pressure applied by the stress balancing ribs 31 to the concrete lining 11.

[0043] The present invention strengthens the axial tensile performance of the concrete lining by simultaneously arranging prestressed tendons and adjustable stress-balancing tendons in the concrete lining, thereby comprehensively improving the tensile performance of the gas storage reservoir; at the same time, in view of the large pressure variation of the underground gas storage reservoir, the strain monitoring mechanism 2 can monitor the axial strain of the concrete lining in real time through the strain gauges 21 evenly arranged on the outer wall of the concrete lining, providing accurate data support for dynamic adjustment. The dynamic adjustment mechanism 3 adjusts the tension of the stress-balancing tendons 31 in real time through the tensioning mechanism 32 according to the data provided by the strain monitoring mechanism 2 to cope with the 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 reservoir, and is of great significance for ensuring the safe operation of the underground gas storage chamber for compressed air energy storage during long-term, high-pressure, and frequent filling and discharging processes.

[0044] In one embodiment, see Figure 1-Figure 4, the gas storage chamber body 1 includes a concrete lining 11 and a plurality of prestressed tendons 12. The concrete lining 11 is cylindrical and has a gas storage cavity therein. The concrete lining 11 is evenly provided with a plurality of first channels 111 and second channels 112 parallel to the axial direction of the concrete lining 11 along its circumference. In this embodiment, the number of the first channels 111 and the second channels 112 are both four, and the first channels 111 and the second channels 112 are arranged at intervals, so as to ensure the uniformity of the distribution of the first channels 111 and the second channels 112 in the circumferential direction, and the prestressed tendons 12 correspond to the first channels 111 one by one, and each prestressed tendon 12 is in a tensioned state and is fixedly embedded in the corresponding first channel 111. The gas storage chamber body 1 also includes a first concrete plug 13 and a second concrete plug 14, which are respectively fixed at the two ends of the concrete lining 11. The first concrete plug 13 is provided with a plurality of first through-holes 131 communicating with the first channel 111 and a plurality of second through-holes communicating with the second channel 112. The second concrete plug 14 is provided with a plurality of third through-holes 141 communicating with the first channel 111 and a plurality of 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, see Figure 1-Figure 4 A channel 142 is also provided on the second concrete plug 14, 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, so as to realize the connection between the air storage chamber and the outside.

[0046] In one embodiment, see Figure 1-Figure 4 , the first through hole 131, the second through hole, the second through hole and the fourth through hole are all curved holes. Since the first through hole 131 and the third through hole 141 are curved holes, the friction between the prestressed tendon 12 and the first through hole 131 and the third through hole 141 will increase, thereby improving the bonding strength between the prestressed tendon 12 and each plug. Since the second through hole and the fourth through hole are curved holes, the contact area between the stress balancing tendon 31 and each plug will be larger, so that the stress balancing tendon 31 can better apply pressure to each plug.

[0047] In one embodiment, see Figure 1 , Figure 5 and Figure 6, one end of each stress-balancing rib 31 is fixedly embedded in the corresponding second through-hole, and the other end passes through the corresponding fourth through-hole and extends to the outside of the second concrete plug 14. The tensioning mechanism 32 includes a first fixed plate 321, a second fixed plate 322, a plurality of sliding rods 323, a plurality of sliding sleeves 324, a sliding block 325, a nut 326, a screw 327 and a rotating driving member 328. The first fixed plate 321 is fixed to the second concrete plug 14, one end of each sliding rod 323 is fixedly connected to the first fixed plate 321, and the other end is fixedly connected to the second fixed plate 322. Each sliding sleeve 324 is slidably arranged on the corresponding sliding rod 323, and the sliding block 325 is fixedly connected to each sliding sleeve 324. The other end of each stress-balancing rib 31 is fixed to the sliding block 325. The sliding block 325 is provided with a mounting hole, and the nut 326 is fixed in the mounting hole. The screw 327 is rotatably connected to the first fixing plate 321 and the second fixing plate 322, and is threadedly inserted in the nut 326. The rotating driving member 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 rib 31, so that when the axial stress of the concrete lining 11 increases, each stress balance rib 31 can increase the stress accordingly, so that the axial stress of the concrete lining 11 inside and outside can be dynamically balanced, so as to improve the structural stability of the concrete lining 11. The advantage of using the screw nut to realize the movement of the sliding block is that the screw nut has a self-locking characteristic, so the rotating driving member 328 does not need to keep the output state all the time, and only needs to drive the screw 327 to rotate when the tension of the stress balance rib 31 needs to be adjusted. At the same time, in order to increase the pressure bearing capacity, the number of sets of screw nuts can be multiple sets.

[0048] In one embodiment, see Figure 1 , Figure 5 and Figure 6 The rotating driving member 328 includes a rotating driving motor 3281, a driving gear 3282 and a driven gear 3283. The housing of the rotating driving motor 3281 is fixed on the second fixed plate 322, the driving gear 3282 is coaxially fixed on the output shaft of the rotating driving motor 3281, and the driven gear 3283 is coaxially fixed on the screw 327 and meshes with the driving gear 3282. When in use, the rotating driving motor 3281 drives the driving gear 3282, the driven gear 3283 and the screw 327 to rotate in sequence, thereby driving the sliding block 325 to move. When the sliding block 325 moves in a direction away from the second concrete plug 14, the tension of each stress balancing rib 31 will increase, and vice versa.

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

[0050] In one embodiment, see Figure 1 , Figure 5 and Figure 6 The first fixed plate 321 is provided with a plurality of avoidance holes for the force balancing ribs 31 to pass through, so as to ensure that the stress balancing ribs 31 can pass through smoothly and be fixed on the sliding block 325. The first fixed plate 321 is also provided with a avoidance hole 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, see Figure 1-Figure 3 The gas storage chamber body 1 also includes a sliding layer 15, a sealing layer 16 and a buffer layer 17. The sliding layer 15 is arranged on the inner wall of the concrete lining 11 to reduce the friction between the lining and the gas storage medium. The sealing layer 16 is arranged on the inner wall of the sliding layer 15 to improve the sealing performance of the gas storage. The buffer layer 17 is arranged 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. The buffer layer 17 is provided with a drainage hole 171 to remove groundwater and other moisture that may affect the stability of the gas storage.

[0052] In one embodiment, see Figure 1-Figure 3 The first concrete plug 13 and the second concrete plug 14 are both wedge-shaped concrete plugs.

[0053] The present invention also provides a construction method of 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 design of the axial prestressed lining structure;

[0056] Step 3: Construction of buffer layer. The inner wall of the buffer layer is constructed according to the standard design section size to control the construction quality. Construction methods such as mesh spraying and formwork casting can be used. It is required to have certain structural strength, toughness and sealing performance. The void gap between the buffer layer and the lining sheet can be filled with grouting behind the wall to ensure direct fit and load transfer between the two.

[0057] Step 4: Concrete lining construction is performed according to the axial prestressed lining structure design, and a plurality of first channels 111 and a plurality of second channels 112 are reserved during the concrete lining construction;

[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 prestressed tendon 12 is passed through the reserved first hole 111, one end of the prestressed tendon 12 is fixed, and the other end is applied with a preset prestress through the tensioning device, and then the other end of the prestressed tendon 12 is fixed, and then grouting is performed through each first hole 111 to make the prestressed tendon 12 tightly combined with the first hole 111; then a sliding layer is laid on the inner surface of the concrete lining to reduce the friction between the sealing layer and the lining, and reduce the influence of deformation on the sealing layer. Then a sealing layer is laid on the inner surface of the sliding layer.

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

[0060] Step 7: In the subsequent production process, the tensioning mechanism 32 drives 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 value of the strain of each strain gauge), thereby adjusting the tension of each stress balance rib 31 and adjusting the pressure applied to the concrete lining 11.

[0061] The present invention strengthens the axial tensile performance of the concrete lining by simultaneously arranging prestressed tendons and adjustable stress-balancing tendons in the concrete lining, thereby comprehensively improving the tensile performance of the gas storage reservoir; at the same time, in view of the large pressure variation of the underground gas storage reservoir, the strain monitoring mechanism 2 can monitor the axial strain of the concrete lining in real time through the strain gauges 21 evenly arranged on the outer wall of the concrete lining, providing accurate data support for dynamic adjustment. The dynamic adjustment mechanism 3 adjusts the tension of the stress-balancing tendons 31 in real time through the tensioning mechanism 32 according to the data provided by the strain monitoring mechanism 2 to cope with the 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 reservoir, and is of great significance for ensuring the safe operation of the underground gas storage chamber for compressed air energy storage during long-term, high-pressure, and frequent filling and discharging processes.

[0062] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope 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 comprises a concrete lining and a plurality of prestressed tendons. The concrete lining is cylindrical and has a gas storage cavity therein. The concrete lining is provided with a plurality of first channels and second channels parallel to the axial direction of the concrete lining evenly along the circumference of the concrete lining. The prestressed tendons correspond to the first channels one by one, and each of the prestressed tendons is in a tensioned state and is fixedly embedded in the corresponding first channel. A strain monitoring mechanism, the strain monitoring mechanism comprising a plurality of strain gauges, each of which is evenly arranged on the outer side wall of the concrete lining and is used to measure the amount of strain at each location of the concrete lining along the axial direction; and A dynamic adjustment mechanism, the dynamic adjustment mechanism includes a plurality of stress-balancing bars and a tensioning mechanism; the stress-balancing bars correspond one-to-one to the second channels, each of the stress-balancing bars is in a tensioning state and is inserted into the corresponding second channel, the tensioning mechanism is connected to each of the stress-balancing bars, and is used to adjust the tension of each of the stress-balancing bars according to the axial strain of the concrete lining.

2. The underground gas storage chamber structure for compressed air energy storage according to claim 1, characterized in that: The gas storage chamber body also includes a first concrete plug and a second concrete plug, which are respectively fixed at both ends of the concrete lining, and the first concrete plug is provided with a plurality of first through-holes connected to the first channel and a plurality of second through-holes connected to the second channel, and the second concrete plug is provided with a plurality of third through-holes connected to the first channel and a plurality of fourth through-holes connected to the second channel, and one end of each of the prestressed tendons is fixedly embedded in the corresponding first through-hole, and the other end of each of the prestressed tendons 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 through hole, the second through hole, the third through hole and the fourth through hole 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 of the stress balancing bars is fixedly embedded in the corresponding second through-hole, and the other end of each of the stress balancing bars 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, a plurality of sliding rods, a plurality of sliding sleeves, a sliding block, a nut, a screw and a rotation driving member, the first fixed plate is fixed to the second concrete plug, one end of each of the sliding rods is fixedly connected to the first fixed plate, the other end of each of the sliding rods is fixedly connected to the second fixed plate, each of the sliding sleeves is slidably arranged on the corresponding sliding rod, the sliding block is fixedly connected to each of the sliding sleeves, the other end of each of the stress balancing ribs is fixed to the sliding block, a mounting hole is provided on the sliding block, the nut is fixed in the mounting hole, the screw is rotationally connected to the first fixed plate and the second fixed plate, the screw thread is inserted in the nut, and the rotation driving member 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 rotary drive member includes a rotary drive motor, a driving gear and a driven gear. The housing of the rotary drive motor is fixed to the second fixed plate. The driving gear is coaxially fixed to the output shaft of the rotary drive motor. The driven gear is coaxially fixed to the screw rod. The driven gear is meshed with the driving gear.

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

7. The underground gas storage chamber structure for compressed air energy storage according to claim 4, characterized in that: The first fixing plate is provided with a plurality of avoidance 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 gas storage chamber body also includes a sliding layer, a sealing layer and a buffer layer. The sliding layer is arranged on the inner wall of the concrete lining, the sealing layer is arranged on the inner wall of the sliding layer, the buffer layer is arranged between the outer wall of the concrete lining and the surrounding rock, and drainage holes are opened in the buffer layer.

9. The underground gas storage chamber structure for compressed air energy storage according to claim 2, characterized in that: The first concrete plug and the second concrete plug are both 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 to 9, characterized in that: include: Step 1: Design the axial prestressed lining structure; Step 2: Excavate the surrounding rock according to the design of the axial prestressed lining structure; Step 3: Carry out concrete lining construction according to the axial prestressed lining structure design, and reserve a number of first channels and a number of second channels during the concrete lining construction; Step 4: After the concrete lining is installed, a number of strain gauges are evenly arranged on the outer wall of the concrete lining, and then each prestressed tendon is passed through the reserved first hole, one end of the prestressed tendon is fixed, and the other end is applied with a preset prestress through a tensioning device, and then the other end of the prestressed tendon is fixed, and then grouting treatment is performed through each first hole, so that the prestressed tendon is tightly combined with the first hole; Step 5: Pass each stress-balancing rib through the reserved second hole, fix one end of the stress-balancing rib, 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-balancing reinforcement according to the axial strain of the concrete lining.

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