Water-rich karst tunnel drainage system

Abstract

The utility model provides a water-rich karst tunnel drainage system, which relates to the technical field of water-rich karst tunnel drainage design and construction and comprises an inverted arch sedimentation tank, a drainage mechanism and a lining drainage pipe. The drainage mechanism and the inverted arch sedimentation tank are both arranged in a lower inverted arch of the tunnel pavement, the drainage mechanism is communicated with the inverted arch sedimentation tank, the extension directions of the drainage mechanism and the inverted arch sedimentation tank are consistent with the extension direction of the tunnel pavement, and the sectional area of the inverted arch sedimentation tank is larger than that of the drainage mechanism. The inverted arch sedimentation tank is used for forming sediment on a fixed structure in karst water, continuous movement of the drainage mechanism is guaranteed, the possibility of pipe blockage caused by crystallization of karst water sediment in the later period can be effectively prevented, and the technical problems that in the prior art, a drainage pipe in a hole is prone to pipe blockage, and potential safety hazards exist are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water-rich karst tunnel drainage design and construction, in particular to a water-rich karst tunnel drainage system. Background Art

[0002] Water-rich karst tunnels are a topic that has been under research. During tunnel construction, accidents such as water gushing, mud bursts, and landslides often occur. At the same time, the long-term precipitation and crystallization of karst water will lead to blockage of drainage pipes. The high water pressure load generated will cause cracks in the tunnel secondary lining and water seepage in the road surface, seriously affecting the safety of the tunnel structure under long-term operation.

[0003] The drainage schemes in the existing technology have limitations. For general water-rich cavities, the scheme of adding drainage pipes in the cave is usually adopted. Although the cost is low and the construction period is short, it is easy to cause pipe blockage due to the long-term precipitation and crystallization of karst water, and there are safety hazards during the operation period. Utility Model Content

[0004] The utility model aims to provide a water-rich karst tunnel drainage system to alleviate the technical problems existing in the prior art that drainage pipes in the tunnel are prone to blockage and pose potential safety hazards.

[0005] The utility model provides a water-rich karst tunnel drainage system, comprising: an inverted sedimentation tank, a drainage mechanism and a lining drainage pipe;

[0006] The drainage mechanism and the inverted arch sedimentation tank are both arranged in the inverted arch under the tunnel pavement, the drainage mechanism is connected to the inverted arch sedimentation tank, the extension direction of the drainage mechanism and the inverted arch sedimentation tank is consistent with the extension direction of the tunnel pavement, the cross-sectional area of ​​the inverted arch sedimentation tank is larger than the cross-sectional area of ​​the drainage mechanism, and the inverted arch sedimentation tank is used to precipitate solid structures in the water flow transported in the drainage mechanism;

[0007] The lining drainage pipe is connected to the drainage mechanism, and the lining drainage pipe is used to transport the accumulated water in the second lining of the tunnel lining to the drainage mechanism.

[0008] In a preferred embodiment of the utility model, the inverted arch sedimentation tank comprises a box-type sedimentation tank, and the cross-sectional size range of the box-type sedimentation tank is: width: 3.8m-4m, height: 2.1m-2.3m;

[0009] The drainage system comprises a rectangular drainage pipe, and the cross-sectional dimensions of the rectangular drainage pipe range from width: 1.2m to 1.4m, and height: 1.28m to 1.38m.

[0010] In a preferred embodiment of the utility model, the lining drainage pipes are provided in a plurality of groups, and the plurality of groups of the lining drainage pipes are arranged at intervals along the extension direction of the tunnel, wherein some of the lining drainage pipes are connected to the drainage mechanism, and another portion of the lining drainage pipes are connected to the invert sedimentation tank.

[0011] In a preferred embodiment of the utility model, each of the lining drainage pipes is arranged obliquely along the lining of the tunnel to the drainage mechanism or the inverted arch sedimentation tank, so that the water in the second lining of the tunnel lining flows into the drainage mechanism or the inverted arch sedimentation tank based on gravity.

[0012] In a preferred embodiment of the utility model, it also includes a maintenance mechanism;

[0013] The maintenance mechanism is arranged on the side wall of the tunnel, and the maintenance mechanism is provided with a maintenance cavern, and the maintenance cavern is communicated with the invert sedimentation tank.

[0014] In a preferred embodiment of the utility model, the inspection mechanism includes a first inspection door, a first inspection step and a first inspection cavern;

[0015] The first inspection door is arranged on the side wall of the tunnel, and the first inspection door leads to the first inspection cavern where the first inspection step is arranged. The first inspection cavern is located on the upstream side of the drainage direction of the inverted arch sedimentation tank, and the first inspection cavern is connected with the inverted arch sedimentation tank.

[0016] In a preferred embodiment of the utility model, the inspection mechanism includes a second inspection door, a second inspection step and a second inspection cavern;

[0017] The second inspection door is arranged on the side wall of the tunnel, and the second inspection door leads to the second inspection cavern where the second inspection steps are arranged. The second inspection cavern is located on the downstream side of the drainage direction of the inverted arch sedimentation tank, and the second inspection cavern is connected with the inverted arch sedimentation tank.

[0018] In a preferred embodiment of the utility model, it also includes a cave drainage pipe;

[0019] One end of the cave drainage pipe is connected to the cave of the tunnel, and the other end of the cave drainage pipe extends into the first inspection cave chamber.

[0020] In a preferred embodiment of the utility model, the bottom of the first inspection cavern has a gravel layer and a blocking bottom plate;

[0021] The blocking bottom plate is located above the gravel layer, and the blocking bottom plate is used to form a blocking plane on the ground of the first inspection cavern.

[0022] In a preferred embodiment of the utility model, a small grouting conduit for grouting and water stopping is installed around the first inspection cavern and the karst cave of the tunnel; a system anchor rod is installed around the lining of the second inspection cavern and the tunnel;

[0023] The lining of the tunnel, the first inspection cavern and the second inspection cavern are formed by integral casting.

[0024] The utility model provides a water-rich karst tunnel drainage system, comprising: an inverted arch sedimentation tank, a drainage mechanism and a lining drainage pipe; the drainage mechanism and the inverted arch sedimentation tank are both arranged in the inverted arch under the tunnel pavement, the drainage mechanism is connected with the inverted arch sedimentation tank, the extension direction of the drainage mechanism and the inverted arch sedimentation tank is consistent with the extension direction of the tunnel pavement, the cross-sectional area of ​​the inverted arch sedimentation tank is larger than the cross-sectional area of ​​the drainage mechanism, the inverted arch sedimentation tank can be used to form sediments on the fixed structure in the karst water, the continuous movement of the drainage mechanism can be ensured, the possibility of karst water precipitation crystallization blocking the pipe in the later stage can be effectively prevented, and the technical problem of easy blocking of the drainage pipe in the cave and potential safety hazards existing in the prior art is alleviated; the lining drainage pipe is connected with the drainage mechanism, and the lining drainage pipe can transport the accumulated water in the second lining of the tunnel lining to the drainage mechanism, so as to avoid the possibility of cracking caused by the pressure increase in the second lining of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the overall structure of a water-rich karst tunnel drainage system provided by an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of a water-rich karst tunnel drainage system along the drainage direction provided by an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of the cross-sectional structure of the water-rich karst tunnel drainage system along the first maintenance cavern provided by an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the cross-sectional structure of the water-rich karst tunnel drainage system along the second inspection cavern provided by the embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the structure of the first inspection cavern of the water-rich karst tunnel drainage system provided by the embodiment of the utility model;

[0031] Figure 6 A schematic diagram of the cross-sectional structure of a water-rich karst tunnel drainage system along the drainage mechanism provided in an embodiment of the utility model.

[0032] Icons: 100-inverted arch sedimentation tank; 200-drainage mechanism; 300-lining drainage pipe; 400-maintenance mechanism; 401-first maintenance door; 402-first maintenance step; 403-first maintenance cavern; 404-second maintenance door; 405-second maintenance step; 406-second maintenance cavern; 407-sealing bottom plate; 500-cave drainage pipe; 600-grouting small guide tube; 700-system anchor rod; 800-lining; 900-cave. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] like Figure 1-Figure 6 As shown, the present embodiment provides a water-rich karst tunnel drainage system, comprising: an inverted arch sedimentation tank 100, a drainage mechanism 200 and a lining drainage pipe 300; the drainage mechanism 200 and the inverted arch sedimentation tank 100 are both arranged in the inverted arch under the tunnel pavement, the drainage mechanism 200 is connected to the inverted arch sedimentation tank 100, the extension direction of the drainage mechanism 200 and the inverted arch sedimentation tank 100 is consistent with the extension direction of the tunnel pavement, the cross-sectional area of ​​the inverted arch sedimentation tank 100 is larger than the cross-sectional area of ​​the drainage mechanism 200, and the inverted arch sedimentation tank 100 is used to precipitate solid structures in the water flow transported in the drainage mechanism 200; the lining drainage pipe 300 is connected to the drainage mechanism 200, and the lining drainage pipe 300 is used to transport the accumulated water in the second lining of the tunnel lining 800 to the drainage mechanism 200.

[0035] It should be noted that the water-rich karst tunnel drainage system provided in this embodiment can provide a drainage system solution with strong applicability, safe structure, high drainage efficiency and convenient maintenance, and can effectively prevent the problem of late precipitation crystallization blocking the pipe; specifically, according to the different components of the water-rich karst cavity in the tunnel, the position of the inverted arch sedimentation tank 100 is dynamically set, and the drainage mechanism 200 can realize the transportation and discharge of karst water. Since the drainage mechanism 200 is connected to the inverted arch sedimentation tank 100, and the cross-sectional area of ​​the inverted arch sedimentation tank 100 is larger than the cross-sectional area of ​​the drainage mechanism 200, that is, when the karst water in the drainage mechanism 200 is transported to the inverted arch sedimentation tank 100, the flow rate will be reduced, so that the solid structure in the karst water forms precipitation in the inverted arch sedimentation tank 100, and the precipitated water will be discharged again through the drainage mechanism 200 to avoid the possibility of karst water precipitation crystallization blocking the pipe.

[0036] Furthermore, the lining drainage pipe 300 serves as a connecting pipe between the tunnel lining 800 and the secondary lining. The lining drainage pipe 300 can be arranged along the radial extension of the tunnel. The drainage direction of the lining drainage pipe 300 is perpendicular to the drainage direction of the drainage mechanism 200. The lining drainage pipe 300 can be used to gradually discharge the accumulated water between the tunnel lining 800 and the secondary lining into the drainage mechanism 200. The drainage is performed by the drainage mechanism 200, thereby avoiding the technical problem of increased water pressure in the space between the tunnel lining 800 and the secondary lining, which causes cracking of the secondary lining. Preferably, the lining drainage pipe 300 is arranged at the bottom of the tunnel to ensure that the accumulated water between the tunnel lining 800 and the secondary lining is discharged as much as possible.

[0037] The water-rich karst tunnel drainage system provided in this embodiment includes: an inverted arch sedimentation tank 100, a drainage mechanism 200 and a lining drainage pipe 300; the drainage mechanism 200 and the inverted arch sedimentation tank 100 are both arranged in the inverted arch under the tunnel pavement, the drainage mechanism 200 is connected to the inverted arch sedimentation tank 100, the extension direction of the drainage mechanism 200 and the inverted arch sedimentation tank 100 is consistent with the extension direction of the tunnel pavement, the cross-sectional area of ​​the inverted arch sedimentation tank 100 is larger than the cross-sectional area of ​​the drainage mechanism 200, the fixed structure in the karst water can be formed into sediment by using the inverted arch sedimentation tank 100, the continuous movement of the drainage mechanism 200 can be ensured, the possibility of karst water precipitation crystallization blocking the pipe in the later stage can be effectively prevented, and the technical problem of easy blocking of the drainage pipe in the cave existing in the prior art and the potential safety hazard is alleviated; the lining drainage pipe 300 is connected to the drainage mechanism 200, and the lining drainage pipe 300 can transport the accumulated water in the second lining of the tunnel lining 800 to the drainage mechanism 200, so as to avoid the possibility of cracking caused by the pressure increase in the second lining of the tunnel.

[0038] On the basis of the above embodiments, further, in a preferred embodiment of the utility model, the inverted arch sedimentation tank 100 includes a box-type sedimentation tank, and the cross-sectional size range of the box-type sedimentation tank is: width: 3.8m-4m, height: 2.1m-2.3m; the drainage system includes a rectangular drainage pipe, and the cross-sectional size range of the rectangular drainage pipe is: width: 1.2m-1.4m, height: 1.28m-1.38m.

[0039] Preferably, the box-type sedimentation tank and the rectangular drainage pipe can be arranged in the invert under the tunnel pavement. The cross-sectional dimensions of the box-type sedimentation tank can be 3.8m wide × 2.1m high, and the cross-sectional dimensions of the rectangular drainage pipe can be 1.2m wide × 1.28m high; and rectangular drainage pipes are respectively connected to both ends of the box-type sedimentation tank to ensure the drainage efficiency of the rectangular drainage pipe on the basis of reducing the flow rate in the sedimentation tank for sedimentation.

[0040] In a preferred embodiment of the utility model, a plurality of groups of lining drainage pipes 300 are provided, and the plurality of groups of lining drainage pipes 300 are arranged at intervals along the extension direction of the tunnel, wherein some of the lining drainage pipes 300 are connected to the drainage mechanism 200 , and another portion of the lining drainage pipes 300 are connected to the invert sedimentation tank 100 .

[0041] In this embodiment, a plurality of lining drainage pipes 300 are arranged at intervals along the extension direction of the tunnel, and the accumulated water between the lining 800 and the second lining of the tunnel is discharged separately by using the plurality of lining drainage pipes 300, thereby ensuring the discharge of the accumulated water in the extension direction of the entire tunnel; preferably, the lining drainage pipes 300 can adopt HPVC pipes, and the distance between any two adjacent lining drainage pipes 300 is 10m.

[0042] In a preferred embodiment of the present invention, each lining drainage pipe 300 is arranged obliquely along the tunnel lining 800 to the drainage mechanism 200 or the inverted arch sedimentation tank 100, so that the water in the second lining of the tunnel lining 800 flows into the drainage mechanism 200 or the inverted arch sedimentation tank 100 based on gravity.

[0043] In this embodiment, the drainage mechanism 200 and the inverted arch sedimentation tank 100 are located below the road surface of the tunnel, and the lining drainage pipe 300 serves as a drainage structure between the tunnel lining 800 and the secondary lining. In order to ensure the timely discharge of accumulated water, the lining drainage pipe 300 is inclined downward from one end close to the lining 800 to one end of the drainage mechanism 200 or the inverted arch sedimentation tank 100, so that the accumulated water between the tunnel lining 800 and the secondary lining can automatically flow into the drainage mechanism 200 or the inverted arch sedimentation tank 100 due to gravity.

[0044] In a preferred embodiment of the utility model, it further includes a maintenance mechanism 400 ; the maintenance mechanism 400 is arranged on the side wall of the tunnel, and the maintenance mechanism 400 opens a maintenance cavern, which is connected to the invert sedimentation tank 100 .

[0045] In this embodiment, the inverted arch sedimentation tank 100 is used as a temporary storage space for sediments. In order to ensure continuous drainage during the operation of the tunnel, a maintenance mechanism 400 is set at a position of the tunnel corresponding to the inverted arch sedimentation tank 100. The maintenance mechanism 400 is provided with a maintenance cavern corresponding to the inverted arch sedimentation tank 100. Maintenance personnel can enter the inverted arch sedimentation tank 100 through the maintenance cavern to regularly clean the sediments in the inverted arch sedimentation tank 100.

[0046] In a preferred embodiment of the utility model, the maintenance mechanism 400 includes a first maintenance door 401, a first maintenance step 402 and a first maintenance cavern 403; the first maintenance door 401 is arranged on the side wall of the tunnel, the first maintenance door 401 leads to the first maintenance cavern 403 where the first maintenance step 402 is arranged, the first maintenance cavern 403 is located on the upstream side of the drainage direction of the inverted arch sedimentation tank 100, and the first maintenance cavern 403 is connected to the inverted arch sedimentation tank 100.

[0047] In this embodiment, the first inspection cavern 403 is located on the upstream side of the inverted arch sedimentation tank 100, and a first inspection door 401 is provided at the side wall position of the tunnel corresponding to the first inspection cavern 403, and the first inspection door 401 can be used to temporarily close the first inspection cavern 403. Since the first inspection door 401 is located at the side wall position of the tunnel, in order to facilitate entry from the first inspection door 401 to the first inspection cavern 403, a first inspection step 402 is provided to facilitate entry for maintenance personnel; further, the width of the first inspection step 402 is smaller than the width of the first inspection door 401, so that maintenance personnel can enter the first inspection cavern 403 through the first inspection door 401 and the first inspection step 402, and then use the empty space next to the first inspection step 402 to enter the inverted arch sedimentation tank 100 through the first inspection cavern 403.

[0048] In a preferred embodiment of the utility model, the maintenance mechanism 400 includes a second maintenance door 404, a second maintenance step 405 and a second maintenance cavern 406; the second maintenance door 404 is arranged on the side wall of the tunnel, and the second maintenance door 404 leads to the second maintenance cavern 406 where a second maintenance step 405 is arranged. The second maintenance cavern 406 is located on the downstream side of the drainage direction of the inverted arch sedimentation tank 100, and the second maintenance cavern 406 is connected to the inverted arch sedimentation tank 100.

[0049] In this embodiment, the second inspection cavern 406 is located on the downstream side of the inverted arch sedimentation tank 100, and a second inspection door 404 is provided at the side wall position of the tunnel corresponding to the second inspection cavern 406. The second inspection door 404 can temporarily close the second inspection cavern 406. Since the second inspection door 404 is located at the side wall position of the tunnel, in order to facilitate entry from the second inspection door 404 to the second inspection cavern 406, a second inspection step 405 is provided to facilitate entry for maintenance personnel; further, the width of the second inspection step 405 is smaller than the width of the second inspection door 404, so that maintenance personnel can enter the second inspection cavern 406 through the second inspection door 404 and the second inspection step 405, and then use the empty space next to the second inspection step 405 to enter the inverted arch sedimentation tank 100 through the second inspection cavern 406.

[0050] In this embodiment, two inspection caverns are respectively provided on the upstream side and the downstream side of the inverted arch sedimentation tank 100, so that the sediment in the inverted arch sedimentation tank 100 can be better dredged and cleaned.

[0051] Optionally, the dimensions of the first inspection cavern 403 and the second inspection cavern 406 may be 6 m high×3.8 m deep×2 m wide.

[0052] In a preferred embodiment of the utility model, a cave drainage pipe 500 is also included; one end of the cave drainage pipe 500 is connected to the cave 900 of the tunnel, and the other end of the cave drainage pipe 500 extends into the first maintenance cavern 403.

[0053] In this embodiment, an inverted arch sedimentation tank 100 is set based on the position of the cave 900, and the cave drainage pipe 500 can extend into the first maintenance cavern 403. Since the first maintenance cavern 403 is located upstream of the inverted arch sedimentation tank 100, that is, after the cave drainage pipe 500 discharges the water in the cave 900 into the inverted arch sedimentation tank 100, the solid structure can also be gradually precipitated through the inverted arch sedimentation tank 100, thereby ensuring the continuous movement of the drainage mechanism 200.

[0054] In a preferred embodiment of the utility model, the bottom of the first inspection cavern 403 has a gravel layer and a blocking bottom plate 407; the blocking bottom plate 407 is located above the gravel layer, and the blocking bottom plate 407 is used to form the ground of the first inspection cavern 403 into a blocking plane.

[0055] In this embodiment, since the first inspection cave 403 is set based on the cave 900, in order to ensure that the accumulated water in the cave 900 received in the first inspection cave 403 enters the inverted arch sedimentation tank 100, the cave 900 at the lower part of the bottom plate of the first inspection cave 403 is backfilled with gravel and then the upper part is sealed with concrete of the sealing bottom plate 407, thereby ensuring the water flow sealing requirement in the first inspection cave 403.

[0056] In a preferred embodiment of the utility model, small grouting tubes 600 are installed around the first inspection cavern 403 and the tunnel cave 900 for grouting and water stopping; system anchor rods 700 are installed around the second inspection cavern 406 and the tunnel lining 800; the tunnel lining 800, the first inspection cavern 403 and the second inspection cavern 406 are formed by integral casting.

[0057] Specifically, when excavating the water-rich karst cave 900, the water stored in the karst cavity is first drained, the karst cavity at the bottom of the tunnel structure is backfilled with crushed stone, the top of the crushed stone is sealed with concrete pouring bottom plate 407, the karst cavity at the top of the tunnel structure is sealed with concrete, and a karst cave drainage pipe 500 is reserved. After the tunnel section and the inspection cavern are excavated, a grouting small conduit 600 is installed around the first inspection cavern 403 and the karst cave 900 for grouting and water stopping, and a system anchor rod 700 is installed around the second inspection cavern 406 and the tunnel lining 800, and then the tunnel lining is constructed. The tunnel comprises structures such as masonry 800, an inverted arch sedimentation tank 100, a first maintenance cavern 403, a second maintenance cavern 406, a drainage mechanism 200, etc. The longitudinal length of the inverted arch sedimentation tank 100 can be set to 40m, and the first maintenance door 401 and the second maintenance door 404 are respectively provided at the entrance of the first maintenance cavern 403 and the second maintenance cavern 406 to prevent maintenance personnel from falling; during the operation of the tunnel, the first maintenance cavern 403 and the second maintenance cavern 406 can be used to regularly clean the sediment according to the situation in the inverted arch sedimentation tank 100.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A water-rich karst tunnel drainage system, characterized in that: include: An inverted sedimentation tank (100), a drainage mechanism (200) and a lined drainage pipe (300); The drainage mechanism (200) and the inverted arch sedimentation tank (100) are both arranged in an inverted arch under a tunnel pavement; the drainage mechanism (200) is connected to the inverted arch sedimentation tank (100); the extension direction of the drainage mechanism (200) and the inverted arch sedimentation tank (100) is consistent with the extension direction of the tunnel pavement; the cross-sectional area of ​​the inverted arch sedimentation tank (100) is larger than the cross-sectional area of ​​the drainage mechanism (200); and the inverted arch sedimentation tank (100) is used to precipitate solid structures in the water flow transported in the drainage mechanism (200); The lining drainage pipe (300) is connected to the drainage mechanism (200), and the lining drainage pipe (300) is used to transport the accumulated water in the second lining of the tunnel lining (800) to the drainage mechanism (200).

2. The water-rich karst tunnel drainage system according to claim 1, characterized in that: The inverted arch sedimentation tank (100) comprises a box-type sedimentation tank, and the cross-sectional dimensions of the box-type sedimentation tank range from 3.8m to 4m in width and 2.1m to 2.3m in height; The drainage system comprises a rectangular drainage pipe, and the cross-sectional dimensions of the rectangular drainage pipe range from width: 1.2m to 1.4m, and height: 1.28m to 1.38m.

3. The water-rich karst tunnel drainage system according to claim 1, characterized in that: The lining drainage pipes (300) are provided in a plurality of groups, and the plurality of groups of lining drainage pipes (300) are arranged at intervals along the extension direction of the tunnel, wherein some of the lining drainage pipes (300) are connected to the drainage mechanism (200), and another portion of the lining drainage pipes (300) are connected to the invert sedimentation tank (100).

4. The water-rich karst tunnel drainage system according to claim 3, characterized in that: Each of the lining drainage pipes (300) is arranged obliquely along the lining (800) of the tunnel to the drainage mechanism (200) or the inverted arch sedimentation tank (100), so that water in the second lining of the lining (800) of the tunnel flows into the drainage mechanism (200) or the inverted arch sedimentation tank (100) based on gravity.

5. The water-rich karst tunnel drainage system according to any one of claims 1 to 4, characterized in that: Also includes a maintenance mechanism (400); The inspection mechanism (400) is arranged on the side wall of the tunnel, and the inspection mechanism (400) is provided with an inspection cavern, which is connected to the invert sedimentation tank (100).

6. The water-rich karst tunnel drainage system according to claim 5, characterized in that: The inspection mechanism (400) comprises a first inspection door (401), a first inspection step (402) and a first inspection cave (403); The first inspection door (401) is arranged on the side wall of the tunnel, the first inspection door (401) leads to the first inspection cavern (403) where the first inspection step (402) is arranged, the first inspection cavern (403) is located on the upstream side of the inverted arch sedimentation tank (100) in the drainage direction, and the first inspection cavern (403) is connected to the inverted arch sedimentation tank (100).

7. The water-rich karst tunnel drainage system according to claim 6, characterized in that: The inspection mechanism (400) comprises a second inspection door (404), a second inspection step (405) and a second inspection cavern (406); The second inspection door (404) is arranged on the side wall of the tunnel, the second inspection door (404) leads to the second inspection cavern (406) provided with the second inspection step (405), the second inspection cavern (406) is located on the downstream side of the inverted arch sedimentation tank (100) in the drainage direction, and the second inspection cavern (406) is connected to the inverted arch sedimentation tank (100).

8. The water-rich karst tunnel drainage system according to claim 7, characterized in that: Also includes a cave drainage pipe (500); One end of the cave drainage pipe (500) is connected to the cave (900) of the tunnel, and the other end of the cave drainage pipe (500) extends into the first inspection cave (403).

9. The water-rich karst tunnel drainage system according to claim 8, characterized in that: The bottom of the first inspection cavern (403) has a gravel layer and a blocking bottom plate (407); The blocking bottom plate (407) is located above the gravel layer, and the blocking bottom plate (407) is used to form a blocking plane on the ground of the first inspection cavern (403).

10. The water-rich karst tunnel drainage system according to claim 8, characterized in that: Small grouting pipes (600) are installed around the first inspection cavern (403) and the karst cave (900) of the tunnel to perform grouting and water sealing; system anchor rods (700) are installed around the second inspection cavern (406) and the lining (800) of the tunnel; The tunnel lining (800), the first inspection cavern (403) and the second inspection cavern (406) are formed by integral casting.

Images