High-head tunnel lining structure and construction method thereof
By using a pressure regulating drainage device in high-head tunnels, the impact of water pressure on the lining during tunnel venting was resolved, achieving a dual reduction in safety and cost, while maintaining the stability and reliability of the tunnel lining structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NORTHWEST ENGINEERING CORPORATION LIMITED
- Filing Date
- 2026-03-23
- Publication Date
- 2026-06-09
Smart Images
Figure CN122169475A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydraulic tunnel technology, and more specifically, to a high-head tunnel lining structure and its construction method. Background Technology
[0002] In hydraulic tunnel design, when the water head exceeds 120 meters, the primary function of the concrete lining is no longer to bear all the internal water pressure. At this point, internal water is allowed to permeate through the lining and transfer to the surrounding rock outside, where the rock's resistance balances the internal water pressure. However, during tunnel venting and maintenance, water seeping to the outside of the lining may not be discharged in time, creating stagnant water pressure that squeezes the lining structure from the outside and affects tunnel safety. Therefore, to ensure tunnel safety, related technologies often increase the lining thickness and reinforcement to improve the overall strength of the lining. However, this leads to excessive material usage, increasing the overall material cost of the lining. Summary of the Invention
[0003] The problem this invention addresses is how to reduce the material cost of tunnel lining while ensuring tunnel safety.
[0004] To address the above problems, this invention provides a high-head tunnel lining structure and its construction method.
[0005] In a first aspect, the present invention provides a high-head tunnel lining structure, including a lining and a pressure regulating drainage device; the pressure regulating drainage device includes a connecting seat and a flexible bag, the connecting seat is disposed on the wall of the lining and one end of the connecting seat is exposed on the outer side of the lining, a central hole is formed in the connecting seat, the flexible bag is disposed outside the lining and the edge of the opening of the flexible bag is connected to the connecting seat; the inner side of the lining is recessed with a communicating hole coaxial with the central hole, the communicating hole is connected to the central hole to form a drainage channel penetrating the wall of the lining.
[0006] Optionally, the connecting seat includes an inner tube and an outer tube that are nested together, the inner cavity of the inner tube forming the central hole, and the edge of the opening of the flexible bag being sandwiched between the inner tube and the outer tube.
[0007] Optionally, the inner tube includes a first tube body and a first ring plate connected to each other, and the outer tube includes a second tube body and a second ring plate connected to each other; the edge of the opening of the flexible bag is configured as a cylindrical structure, the cylindrical structure including a cylindrical section and a straight section connected sequentially in the direction toward the outside of the flexible bag, the cylindrical section being sandwiched between the first tube body and the second tube body, and the straight section being sandwiched between the first ring plate and the second ring plate.
[0008] Optionally, a welding layer is provided between the first ring plate and the second ring plate, the welding layer surrounding the straight section and being disposed near the outer edge of the first ring plate.
[0009] Optionally, the pressure regulating drainage device further includes a fastener that passes sequentially through the straight section and the second ring plate to fix the straight section to the second ring plate.
[0010] Optionally, the cross-sectional structure of the flexible bag includes an inner layer, a middle layer, and an outer layer stacked sequentially. The inner layer is made of wear-resistant polyurethane, the middle layer is made of aramid fiber, and the outer layer is made of hydrolysis-resistant neoprene rubber.
[0011] Optionally, the wall of the lining is provided with a plurality of connecting holes, which are arranged sequentially along the circumference of the lining, and the number of connecting holes located on the upper part of the lining is less than the number of connecting holes located on the lower part of the lining; a plurality of pressure regulating drainage devices are provided, and the plurality of pressure regulating drainage devices are correspondingly provided at the plurality of connecting holes.
[0012] Secondly, the present invention provides a construction method for the high-head tunnel lining structure as described above, comprising: During the lining reinforcement binding stage, the pressure regulating drainage device is fixed to the reinforcement cage; The lining concrete is poured to obtain the lining, wherein the connecting seat of the pressure regulating drainage device is enclosed in the wall concrete of the lining.
[0013] Optionally, before fixing the pressure regulating drainage device to the reinforcing steel frame during the lining reinforcement binding stage, the method further includes: The edge of the flexible bag opening is clamped between the inner and outer tubes of the connecting seat, and then the first ring plate of the inner tube and the second ring plate of the outer tube are welded together to obtain the pressure regulating drainage device.
[0014] Optionally, fixing the pressure regulating drainage device to the steel reinforcement frame includes: The steel reinforcement cage is divided into multiple ring regions arranged sequentially along its axial direction. Multiple pressure regulating drainage devices are provided in each ring region, and the multiple pressure regulating drainage devices are arranged sequentially along the circumferential direction of the ring region.
[0015] The beneficial effects of the high-head tunnel lining structure of the present invention are as follows: Because the flexible bag is located outside the lining and its opening edge is connected to the connecting seat, and the connecting hole of the lining is connected to the central hole of the connecting seat to form a drainage channel penetrating the lining wall, water can be ensured to flow between the inside of the lining and the inside of the flexible bag. Thus, on the one hand, when the tunnel needs to be vented for maintenance, the water in the flexible bag will flow into the lining quickly due to the reverse high pressure difference, so as to avoid the external pressure from squeezing the lining for a long time and affecting safety. This allows the lining design to significantly reduce or even eliminate the external water pressure load under the venting condition, so as to minimize the thickness and reinforcement of the lining, thereby reducing the material cost of the lining while ensuring the safety of the tunnel. On the other hand, during the process of water in the flexible bag flowing into the lining, the generated reverse flushing flow can wash away the mud and sand particles attached to the inner wall of the flexible bag and accumulated near the drainage channel, realizing automatic flushing and dredging, avoiding the accumulation of mud and sand particles from affecting the normal flow of water, thereby ensuring the performance stability of the entire tunnel lining structure. Attached Figure Description
[0016] Figure 1 This is a cross-sectional schematic diagram of the high-head tunnel lining structure according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of section A of the lining structure of a medium-to-high head tunnel; Figure 3 This is a schematic cross-sectional view of the high-head tunnel lining structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the working state of the high-head tunnel lining structure during the water-filling operation period according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the working state of the high-head tunnel lining structure during the initial venting phase, according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the working state of the high-head tunnel lining structure during the complete venting period, according to an embodiment of the present invention.
[0017] Explanation of reference numerals in the attached figures: 1. Lining; 11. Connecting hole; 2. Pressure regulating drainage device; 21. Connecting seat; 211. Inner pipe; 2111. Central hole; 2112. First pipe body; 2113. First ring plate; 212. Outer pipe; 2121. Second pipe body; 2122. Second ring plate; 22. Flexible bag; 221. Bag opening edge; 2211. Cylindrical section; 2212. Straight section; 23. Welding layer; 24. Fastener; 3. Drainage channel. Detailed Implementation
[0018] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.
[0019] In the attached figures, the X-axis represents the front-to-back position, with the positive direction of the X-axis representing the front and the negative direction representing the rear. The Y-axis represents the left-to-right position, with the positive direction representing the left and the negative direction representing the right. The Z-axis represents the up-down position, with the positive direction representing the top and the negative direction representing the bottom. It should be noted that the aforementioned representations of the X, Y, and Z axes are for ease of description and simplification of the invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.
[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.
[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".
[0022] This invention provides a high-head tunnel lining structure and its construction method, which will be described in detail below with reference to specific embodiments.
[0023] like Figures 1 to 3As shown in the figure, an embodiment of the present invention provides a high-head tunnel lining structure, including a lining 1 and a pressure regulating and drainage device 2; the pressure regulating and drainage device 2 includes a connecting seat 21 and a flexible bag 22. The connecting seat 21 is disposed on the wall of the lining 1 and one end of it is exposed on the outer side of the lining 1. A central hole 2111 is opened in the connecting seat 21. The flexible bag 22 is disposed outside the lining 1, and the edge 221 of the bag opening of the flexible bag 22 is connected to the connecting seat 21. A connecting hole 11 coaxial with the central hole 2111 is recessed on the inner side of the lining 1. The connecting hole 11 is connected to the central hole 2111 to form a drainage channel 3 penetrating the wall of the lining 1.
[0024] It should be noted that the lining 1 can be a tubular structure for water passage. Furthermore, the working principle of the high-head tunnel lining structure is as follows: when the tunnel is in the water-filled operation period, if... Figure 4 As shown, the internal water pressure of lining 1 increases and becomes higher than the external water pressure. High-pressure water flows continuously into the flexible bag 22 through drainage channel 3, expanding the flexible bag 22 and ultimately causing the internal and external water pressures to quickly reach equilibrium. When the tunnel is in the initial venting phase, as... Figure 5 As shown, first, the water inlet supplying water to lining 1 is closed. Then, the water pressure inside lining 1 drops rapidly, while the water pressure outside lining 1 decreases more slowly due to the longer release path, instantly creating a state where "external water pressure > internal water pressure." This instantaneous reverse high pressure difference then pushes the water inside the flexible bag 22 to generate a brief but strong reverse flushing flow. This reverse flushing flow rushes into lining 1, flushing back the mud and sand particles adhering to the inner wall of the flexible bag 22 and accumulated near the drainage channel 3 into lining 1, where they are carried away by the main flow, achieving automatic flushing and sludge removal. When the tunnel is completely emptied, such as... Figure 6 As shown, the reverse flushing flow rapidly releases the external water pressure, achieving pressure differential balance, thereby preventing the external water pressure from squeezing the lining 1 and affecting safety.
[0025] In this embodiment, because the flexible bag 22 is located outside the lining 1 and its opening edge 221 is connected to the connecting seat 21, and the connecting hole 11 of the lining 1 is connected to the central hole 2111 of the connecting seat 21 to form a drainage channel 3 penetrating the wall of the lining 1, water can flow between the inside of the lining 1 and the inside of the flexible bag 22. Thus, on the one hand, when the tunnel needs to be vented for maintenance, the water in the flexible bag 22 will quickly flow into the lining 1 due to the reverse high pressure difference, thus avoiding long-term external pressure squeezing the lining 1 and affecting safety. This design allows for a significant reduction or even elimination of the external water pressure load during venting operations, thereby minimizing the thickness and reinforcement of lining 1. This ensures tunnel safety while reducing material costs for lining 1. Furthermore, during the process of water flowing into lining 1 from the flexible bag 22, the resulting reverse flushing flow washes away the mud and sand particles adhering to the inner wall of the flexible bag 22 and accumulating near the drainage channel 3, achieving automatic flushing and dredging. This prevents the accumulation of mud and sand particles from affecting the normal flow of water, thus ensuring the stable performance of the entire tunnel lining structure.
[0026] Optionally, such as Figure 1 As shown, the connecting seat 21 includes an inner tube 211 and an outer tube 212 that are nested together. The inner cavity of the inner tube 211 forms the central hole 2111. The bag opening edge 221 of the flexible bag 22 is sandwiched between the inner tube 211 and the outer tube 212.
[0027] It should be noted that the inner tube 211 and the outer tube 212 can be made of steel pipes, so that the two can be welded together to form a whole.
[0028] In this optional embodiment, by setting the connecting seat 21 to include an inner tube 211 and an outer tube 212 that are nested together, and clamping the bag opening edge 221 of the flexible bag 22 between the inner tube 211 and the outer tube 212, it is not only convenient to connect the flexible bag 22 to the connecting seat 21, but also to prevent the flexible bag 22 from coming loose from the connecting seat 21 and affecting the pressure regulating and drainage effect of the device.
[0029] Optionally, such as Figure 1 As shown, the inner tube 211 includes a first tube body 2112 and a first ring plate 2113 connected to each other, and the outer tube 212 includes a second tube body 2121 and a second ring plate 2122 connected to each other; the bag opening edge 221 of the flexible bag 22 is configured as a cylindrical structure, the cylindrical structure includes a cylindrical section 2211 and a straight section 2212 connected sequentially in the direction toward the outside of the flexible bag 22, the cylindrical section 2211 is sandwiched between the first tube body 2112 and the second tube body 2121, and the straight section 2212 is sandwiched between the first ring plate 2113 and the second ring plate 2122.
[0030] Specifically, the inner end of the first tube 2112 is close to the connecting hole 11, and the outer end is exposed on the outer side of the lining 1. The inner circumference of the first ring plate 2113 is connected to the inner end of the first tube 2112. The second tube 2121 is sleeved on the first tube 2112, and the second ring plate 2122 is connected to the inner end of the second tube 2121 and is correspondingly arranged with respect to the first ring plate 2113.
[0031] In this optional embodiment, the inner tube 211 is configured to include a first tube body 2112 and a first ring plate 2113 connected to each other, and the outer tube 212 is configured to include a second tube body 2121 and a second ring plate 2122 connected to each other. Thus, the cross-section of the wall portion of the connecting seat 21 can be approximately L-shaped, thereby allowing the connecting seat 21 to form a mutually fitting relationship with the wall portion of the lining 1. This effectively prevents the connecting seat 21 from loosening and causing leakage under repeated impacts of high water pressure. Additionally, due to the bag opening edge... The cylindrical section 2211 along 221 is sandwiched between the first tube body 2112 of the inner tube 211 and the second tube body 2121 of the outer tube 212, and the straight section 2212 of the bag opening edge 221 is sandwiched between the first ring plate 2113 of the inner tube 211 and the second ring plate 2122 of the outer tube 212. In this way, the reliability of the connection between the bag opening edge 221 and the connecting seat 21 can be effectively guaranteed, thereby more reliably preventing the flexible bag 22 from loosening from the connecting seat 21 and affecting the pressure regulating and drainage effect of the device.
[0032] Optionally, such as Figure 1 and Figure 2 As shown, a welding layer 23 is provided between the first ring plate 2113 and the second ring plate 2122. The welding layer 23 surrounds the straight section 2212 and is disposed near the outer edge of the first ring plate 2113.
[0033] It should be noted that the weld formation layer 23 can be the material layer formed after the first ring plate 2113 and the second ring plate 2122 are welded together.
[0034] In this optional embodiment, by providing a welding forming layer 23 between the first ring plate 2113 and the second ring plate 2122, and by providing the welding forming layer 23 around the straight section 2212 and close to the outer edge of the first ring plate 2113, a reliable sealing connection between the inner tube 211 and the outer tube 212 can be achieved, thereby effectively preventing leakage.
[0035] Optionally, such as Figure 1 and Figure 2 As shown, the pressure regulating drainage device 2 also includes a fastener 24, which passes through the straight section 2212 and the second ring plate 2122 in sequence to fix the straight section 2212 to the second ring plate 2122.
[0036] Specifically, fastener 24 can be a bolt.
[0037] In this optional embodiment, the fastener 24 passes through the straight section 2212 and the second ring plate 2122 in sequence, which can fix the straight section 2212 to the second ring plate 2122, thereby further ensuring the reliability of the connection between the bag opening edge 221 and the connecting seat 21.
[0038] Optionally, the cross-sectional structure of the flexible bag 22 includes an inner layer, a middle layer and an outer layer stacked sequentially. The inner layer is made of wear-resistant polyurethane, the middle layer is made of aramid fiber, and the outer layer is made of hydrolysis-resistant neoprene rubber.
[0039] It should be noted that the flexible bag 22 can be obtained by molding three layers of materials, namely wear-resistant polyurethane, aramid fiber, and hydrolysis-resistant neoprene rubber.
[0040] In this optional embodiment, by setting the inner layer of the flexible bag 22 to wear-resistant polyurethane, the middle layer to aramid fiber, and the outer layer to hydrolysis-resistant neoprene rubber, it can be ensured that the flexible bag 22 has a certain degree of elasticity. In this way, when the tunnel is completely vented, the flexible bag 22 can be tightly attached to the outer side of the lining 1, thereby blocking the continuous infiltration of groundwater into the wall of the lining 1 and protecting the lining 1.
[0041] Optionally, such as Figure 3 As shown, the wall of the lining 1 is provided with a plurality of the aforementioned connecting holes 11, which are arranged sequentially along the circumference of the lining 1, and the number of the connecting holes 11 located on the upper part of the lining 1 is less than the number of the connecting holes 11 located on the lower part of the lining 1; a plurality of pressure regulating drainage devices 2 are provided, and the plurality of pressure regulating drainage devices 2 are correspondingly provided at the plurality of the connecting holes 11.
[0042] In this optional embodiment, by sequentially arranging multiple connecting holes 11 along the circumference of the lining 1 and correspondingly placing multiple pressure-regulating drainage devices 2 at each of the multiple connecting holes 11, on the one hand, during the filling or emptying of the tunnel, water can be simultaneously regulated and drained through multiple pressure-regulating drainage devices 2, resulting in higher pressure-regulating drainage efficiency; on the other hand, multiple pressure-regulating drainage devices 2 can give the tunnel lining structure a natural fault-tolerant function, and the accidental damage of a single pressure-regulating drainage device 2 will not affect the whole structure, greatly improving the reliability of the tunnel lining structure. Furthermore, because the water pressure in the upper space inside the lining 1 is lower than that in the lower space, this embodiment sets the number of connecting holes 11 located in the upper part of the lining 1 to be less than the number of connecting holes 11 located in the lower part of the lining 1, thus ensuring that there are more pressure-regulating drainage devices 2 in areas with higher water pressure, thereby better balancing the internal and external water pressure and effectively protecting the lining 1.
[0043] Reference Figures 1 to 3The present invention provides a construction method for a high-head tunnel lining structure as described above, comprising: Step S1: During the lining reinforcement binding stage, fix the pressure regulating drainage device 2 to the reinforcement cage; Step S2: Pour lining concrete to obtain lining 1, wherein the connecting seat 21 of the pressure regulating drainage device 2 is encased in the wall concrete of the lining 1.
[0044] In this embodiment, by first fixing the pressure regulating drainage device 2 to the reinforcing steel frame and then pouring the lining concrete to obtain the lining 1, the pressure regulating drainage device 2 can be pre-embedded in the wall concrete of the lining 1, achieving integration of the pressure regulating drainage device 2 and the lining 1. This effectively prevents the connecting seat 21 from loosening and causing leakage under repeated impacts of high water pressure, and also ensures that the lifespan of the pressure regulating drainage device 2 is synchronized with that of the lining 1. Furthermore, since the pressure regulating drainage device 2 is pre-embedded during the casting process of the lining 1, the pressure regulating drainage device 2 can act as a pre-crack in the lining 1, preventing water from leaking from uncertain cracks in other locations of the lining 1, thereby reducing the leakage of the high-pressure tunnel.
[0045] It should be noted that after step S2, the effect of the high-head tunnel lining structure can be verified. During the water filling test, it was observed that the amount of water seepage outside the lining 1 was initially large and then quickly stabilized, indicating that the pressure regulating drainage device 2 was effective. After emptying, the surface of the lining 1 was dry and there were no signs of water seepage. In addition, a small amount of mud and sand could be seen in the discharged water initially, which became clear later, indicating that the pressure regulating drainage device 2 had a self-cleaning effect.
[0046] Optionally, refer to Figures 1 to 3 Before fixing the pressure regulating drainage device 2 to the steel reinforcement cage during the lining reinforcement binding stage, the method further includes: Step S0: The edge 221 of the opening of the flexible bag 22 is clamped between the inner tube 211 and the outer tube 212 of the connecting seat 21. Then, the first ring plate 2113 of the inner tube 211 and the second ring plate 2122 of the outer tube 212 are welded to obtain the pressure regulating drainage device 2.
[0047] Specifically, the welding method for the first ring plate 2113 and the second ring plate 2122 can be argon arc welding.
[0048] In this optional embodiment, by first clamping the edge 221 of the opening of the flexible bag 22 between the inner tube 211 and the outer tube 212 of the connecting seat 21, and then welding the first ring plate 2113 of the inner tube 211 and the second ring plate 2122 of the outer tube 212, the pressure regulating drainage device 2 is obtained. How can we ensure that the edge 221 of the opening of the flexible bag 22 is firmly clamped in the connecting seat 21, so as to prevent the flexible bag 22 from falling off the connecting seat 21 and affecting the pressure regulating drainage effect of the device?
[0049] Optionally, refer to Figures 1 to 3 The step of fixing the pressure regulating drainage device 2 to the steel reinforcement frame includes: The steel reinforcement cage is divided into multiple ring regions arranged sequentially along its axial direction. Multiple pressure regulating drainage devices 2 are provided in each ring region, and the multiple pressure regulating drainage devices 2 are arranged sequentially along the circumferential direction of the ring region.
[0050] In this optional embodiment, by dividing the steel reinforcement cage into multiple ring regions arranged sequentially along its axial direction, and each ring region is provided with multiple pressure regulating and drainage devices 2 arranged in a circumferential direction, it can be ensured that the final lining 1 is provided with pressure regulating and drainage devices 2 in both the axial and circumferential directions, thereby giving the tunnel lining structure a natural fault tolerance function. The accidental damage of a single pressure regulating and drainage device 2 will not affect the whole structure, thus greatly improving the reliability of the tunnel lining structure.
[0051] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.
Claims
1. A high-head tunnel lining structure, characterized in that, The device includes a lining (1) and a pressure regulating drainage device (2); the pressure regulating drainage device (2) includes a connecting seat (21) and a flexible bag (22). The connecting seat (21) is located on the wall of the lining (1) and one end of it is exposed on the outer side of the lining (1). A central hole (2111) is provided in the connecting seat (21). The flexible bag (22) is located outside the lining (1) and the edge (221) of the bag opening of the flexible bag (22) is connected to the connecting seat (21). A connecting hole (11) coaxial with the central hole (2111) is recessed on the inner side of the lining (1). The connecting hole (11) is connected to the central hole (2111) to form a drainage channel (3) that penetrates the wall of the lining (1).
2. The high-head tunnel lining structure according to claim 1, characterized in that, The connecting seat (21) includes an inner tube (211) and an outer tube (212) that are nested together. The inner cavity of the inner tube (211) forms the central hole (2111). The edge (221) of the opening of the flexible bag (22) is sandwiched between the inner tube (211) and the outer tube (212).
3. The high-head tunnel lining structure according to claim 2, characterized in that, The inner tube (211) includes a first tube body (2112) and a first ring plate (2113) connected to each other, and the outer tube (212) includes a second tube body (2121) and a second ring plate (2122) connected to each other; the bag opening edge (221) of the flexible bag (22) is configured as a cylindrical structure, the cylindrical structure including a cylindrical section (2211) and a straight section (2212) connected sequentially in the direction toward the outside of the flexible bag (22), the cylindrical section (2211) is sandwiched between the first tube body (2112) and the second tube body (2121), and the straight section (2212) is sandwiched between the first ring plate (2113) and the second ring plate (2122).
4. The high-head tunnel lining structure according to claim 3, characterized in that, A welding layer (23) is provided between the first ring plate (2113) and the second ring plate (2122). The welding layer (23) surrounds the straight section (2212) and is disposed near the outer edge of the first ring plate (2113).
5. The high-head tunnel lining structure according to claim 3, characterized in that, The pressure regulating drainage device (2) further includes a fastener (24) which passes through the straight section (2212) and the second ring plate (2122) in sequence to fix the straight section (2212) to the second ring plate (2122).
6. The high-head tunnel lining structure according to claim 1, characterized in that, The cross-sectional structure of the flexible bag (22) includes an inner layer, a middle layer and an outer layer stacked in sequence. The inner layer is made of wear-resistant polyurethane, the middle layer is made of aramid fiber and the outer layer is made of hydrolysis-resistant chloroprene rubber.
7. The high-head tunnel lining structure according to claim 1, characterized in that, The wall of the lining (1) is provided with a plurality of the connecting holes (11), which are arranged sequentially along the circumference of the lining (1), and the number of the connecting holes (11) located on the upper part of the lining (1) is less than the number of the connecting holes (11) located on the lower part of the lining (1); a plurality of pressure regulating drainage devices (2) are provided, and the plurality of pressure regulating drainage devices (2) are provided one-to-one at the plurality of the connecting holes (11).
8. A construction method for a high-head tunnel lining structure as described in any one of claims 1-7, characterized in that, include: During the lining reinforcement binding stage, the pressure regulating drainage device (2) is fixed on the reinforcement cage; The lining concrete is poured to obtain the lining (1), wherein the connecting seat (21) of the pressure regulating drainage device (2) is encased in the wall concrete of the lining (1).
9. The construction method for the high-head tunnel lining structure according to claim 8, characterized in that, Before fixing the pressure regulating drainage device (2) to the steel reinforcement cage during the lining reinforcement binding stage, the method further includes: The edge (221) of the opening of the flexible bag (22) is clamped between the inner tube (211) and the outer tube (212) of the connecting seat (21). Then, the first ring plate (2113) of the inner tube (211) and the second ring plate (2122) of the outer tube (212) are welded to obtain the pressure regulating drainage device (2).
10. The construction method for the high-head tunnel lining structure according to claim 8, characterized in that, The process of fixing the pressure regulating drainage device (2) to the steel reinforcement frame includes: The steel reinforcement cage is divided into multiple ring regions arranged sequentially along its axial direction. Multiple pressure regulating drainage devices (2) are provided in each ring region, and the multiple pressure regulating drainage devices (2) are arranged sequentially along the circumferential direction of the ring region.