Tunnel drainage system

Abstract

The utility model provides a tunnel drainage system which comprises a first longitudinal drainage unit, a first transverse drainage unit, a second transverse drainage unit and a second longitudinal drainage unit, the first longitudinal drainage unit is used for collecting water coming from a road surface and guiding and draining the water to a roadbed side ditch outside a tunnel, and the first transverse drainage unit is arranged below the road surface. The first transverse drainage unit is arranged below the first transverse drainage unit and used for collecting seepage water at the bottom of a pavement structure and guiding and draining the seepage water to the first longitudinal drainage unit, and the second transverse drainage unit is arranged below the first transverse drainage unit and used for collecting seepage water of surrounding rocks and guiding and draining the seepage water to the second longitudinal drainage unit. The drainage device is used for guiding and draining collected water to a roadbed side ditch outside a hole. Wastewater above the tunnel pavement, seepage water of surrounding rocks and accumulated water at the bottom of the tunnel pavement structure can be smoothly drained out of the tunnel, and meanwhile the construction convenience of the tunnel drainage structure can be considered.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel drainage, in particular to a tunnel drainage system. Background Art

[0002] The drainage of tunnel systems mainly includes road surface water drainage, surrounding rock seepage water drainage, and seepage water drainage under the road surface structure. Among them, the current drainage system of highway tunnel pavement generally adopts an open ditch set on the side of the pavement to discharge road surface water. However, a large number of engineering practices have shown that the design of this open ditch has some disadvantages. First, the size and water-passing section of the open ditch are small and shallow, which greatly limits its ability to drain operating cleaning water, firefighting water and other wastewater, causing these wastewaters to flow horizontally along the road surface; secondly, the garbage on the tunnel pavement is easy to fall into the open ditch, which is not only inconvenient to clean, but also easy to cause siltation and blockage. It is also easy to be crushed by vehicles and has poor maintenance.

[0003] For the water inside the surrounding rock, the current common practice is to install horizontal HDPE corrugated pipes to drain the surrounding rock seepage water to the cast-in-place reinforced concrete rectangular central ditch. However, the horizontal HDPE drainage pipe is long and due to rough construction, it is easy to cause the pipe to break, thus affecting the drainage effect. The rectangular central ditch is cast on site, which is extremely inconvenient to construct.

[0004] The current measures to discharge water from the bottom of the tunnel pavement structure are not perfect, which affects the durability of the pavement structure. In addition, the water accumulation in the tunnel cable trench will affect the operation of the equipment, especially in cold areas, where the water may freeze. There is currently a lack of effective measures to prevent the problem of water accumulation in the cable trench.

[0005] In summary, the current highway tunnel drainage structure has many drawbacks, and a complete drainage system structure is urgently needed to solve these problems.

[0006] In view of this, it is necessary to propose a tunnel drainage system to solve or at least alleviate the above defects. Utility Model Content

[0007] The main purpose of the utility model is to provide a tunnel drainage system to solve the technical problem of how to ensure that waste water above the tunnel pavement, water seepage from surrounding rocks and water accumulated at the bottom of the tunnel pavement structure are drained out of the tunnel.

[0008] To achieve the above object, the utility model provides a tunnel drainage system, including a first longitudinal drainage unit, a first transverse drainage unit, a second transverse drainage unit and a second longitudinal drainage unit, wherein:

[0009] The first longitudinal drainage unit is used to collect water from the road surface and drain it to the roadbed ditch outside the tunnel. The first transverse drainage unit is arranged below the road surface, and is used to collect water seeping from the bottom of the road surface structure and drain it to the first longitudinal drainage unit. The second transverse drainage unit is arranged below the first transverse drainage unit, and is used to collect water seeping from the surrounding rock and drain it to the second longitudinal drainage unit. The second longitudinal drainage unit is arranged below the first transverse drainage unit, and is used to drain the collected water to the roadbed ditch outside the tunnel.

[0010] Preferably, the first longitudinal drainage unit comprises two longitudinal roadside gutters arranged opposite to each other on both sides of the tunnel pavement, and the longitudinal roadside gutters are used to collect water from the pavement.

[0011] Preferably, the first longitudinal drainage unit also includes two longitudinal cable trenches corresponding one to one with the longitudinal roadside ditches, the cable trenches are arranged on the outer sides of the corresponding longitudinal roadside ditches, the bottom of each longitudinal cable trench is provided with a longitudinal drainage groove on the side close to the corresponding longitudinal roadside ditch, the bottom of the longitudinal drainage groove is higher than the bottom of the longitudinal roadside ditch, the side wall of the longitudinal cable trench is provided with a first reserved drainage hole connected to the longitudinal drainage groove, the side wall of the longitudinal roadside ditch is provided with a second reserved drainage hole corresponding to the first reserved drainage hole, and the accumulated water in the longitudinal drainage groove is drained to the longitudinal roadside ditch through the first reserved drainage hole and the second reserved drainage hole.

[0012] Preferably, the first transverse drainage unit includes a transverse permeable blind pipe, which is arranged between the two longitudinal roadside ditches. The transverse permeable blind pipe has a drainage slope toward the longitudinal roadside ditch. The longitudinal roadside ditch is provided with a drainage hole for the transverse permeable blind pipe to pass through. The transverse permeable blind pipe drains the collected seepage water at the bottom of the pavement structure into the longitudinal roadside ditch by passing through the drainage hole.

[0013] Preferably, the second longitudinal drainage unit comprises a central longitudinal drainage ditch located below the transverse permeable blind pipe, and the central longitudinal drainage ditch extends along the extension direction of the tunnel.

[0014] Preferably, the second transverse drainage unit includes two surrounding rock seepage drainage units respectively arranged on both sides of the central longitudinal drainage ditch, each of the surrounding rock seepage drainage units includes a corrugated pipe section and a reinforced concrete pipe section, the water inlet end of the corrugated pipe section is used to connect to the longitudinal drainage pipe of the lining arch foot, the water inlet end of the reinforced concrete pipe section is connected with the water outlet end of the corrugated pipe section, and the water outlet end of the reinforced concrete pipe section is connected with the central longitudinal drainage ditch to drain the surrounding rock seepage to the central longitudinal drainage ditch.

[0015] Preferably, the longitudinal roadside ditch is provided with a plurality of ditch sand settling wells spaced apart along the extension direction of the longitudinal roadside ditch.

[0016] Preferably, the central longitudinal drainage ditch is provided with a plurality of blind wells arranged at intervals along the extension direction of the central longitudinal drainage ditch, and a plurality of inspection wells arranged at intervals along the extension direction of the central longitudinal drainage ditch, and the blind wells and the inspection wells are staggered along the extension direction of the central longitudinal drainage ditch.

[0017] Preferably, the water outlet end of the corrugated pipe section is located on the inner side of the corresponding longitudinal roadside ditch.

[0018] Preferably, the depth and width of the longitudinal drainage groove are both set to 5 cm.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a tunnel drainage system, comprising a first longitudinal drainage unit, a first transverse drainage unit, a second transverse drainage unit and a second longitudinal drainage unit, the first longitudinal drainage unit is used to collect water from the road surface and drain it to the roadbed ditch outside the tunnel, the first transverse drainage unit is arranged below the road surface, is used to collect water seepage at the bottom of the road surface structure and drain it to the first longitudinal drainage unit, the second transverse drainage unit is arranged below the first transverse drainage unit, is used to collect water seepage from the surrounding rock and drain it to the second longitudinal drainage unit, the second longitudinal drainage unit is arranged below the second transverse drainage unit, is used to drain the collected water to the roadbed ditch outside the tunnel. The present application can ensure that wastewater above the tunnel pavement, water seepage from the surrounding rocks, and water accumulated at the bottom of the tunnel pavement structure are smoothly discharged to the outside of the tunnel, while also taking into account the convenience of tunnel drainage structure construction. Specifically, buried longitudinal roadside ditches and ditch sand settling wells can be used to collect operational cleaning water, fire-fighting water and other wastewater, and discharge road sewage to the outside of the tunnel; a combination of corrugated pipe sections and reinforced concrete pipe sections can be used to drain surrounding rock seepage to the central longitudinal drainage ditch while taking into account the convenience of construction; transverse permeable blind pipes can be used to drain the water accumulated at the bottom of the tunnel pavement structure smoothly to the longitudinal roadside ditches; the second longitudinal drainage unit can be assembled, which greatly improves the construction operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1A top view of a first longitudinal drainage unit in an embodiment of the present utility model;

[0023] Figure 2 It is an elevation view of a first longitudinal drainage unit in one embodiment of the utility model;

[0024] Figure 3 It is a schematic elevation diagram of an application scenario diagram in one embodiment of the utility model;

[0025] Figure 4 It is a top view schematic diagram of an application scenario schematic diagram in one embodiment of the utility model;

[0026] Figure 5 This is an application scenario diagram of a reinforced concrete pipe section in an embodiment of the utility model;

[0027] Figure 6 It is a schematic diagram of draining water from a longitudinal cable trench in one embodiment of the utility model;

[0028] Figure 7 It is a schematic diagram of the connection between the transverse water-permeable blind pipe and the longitudinal cable trench in one embodiment of the utility model;

[0029] Figure 8 This is an application scenario diagram of the overall structure in one embodiment of the utility model.

[0030] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0031] Description of Figure Numbers:

[0032] 10. First longitudinal drainage unit; 110. Longitudinal roadside ditch; 111. Ditch sand well; 112. Drainage hole; 113. Second reserved drainage hole; 120. Longitudinal cable trench; 121. Longitudinal drainage groove; 122. First reserved drainage hole; 20. First transverse drainage unit; 210. Transverse permeable blind pipe; 220. Geotextile; 30. Second transverse drainage unit; 310. Surrounding rock seepage drainage unit; 311. Corrugated pipe section; 312. Reinforced concrete pipe section; 40. Second longitudinal drainage unit; 410. Central longitudinal drainage ditch; 411. Blind well; 412. Inspection well; 50. Roadbed ditch outside the tunnel; 510. Drainage ditch; 60. Pavement; 70. Lining arch foot longitudinal drainage pipe. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] See also Figures 1 to 8 A tunnel drainage system in an embodiment of the utility model includes a first longitudinal drainage unit 10, a first transverse drainage unit 20, a second transverse drainage unit 30 and a second longitudinal drainage unit 40, wherein the first longitudinal drainage unit 10 is used to collect water from a road surface 60 and drain it to a roadbed ditch 50 outside the tunnel, the first transverse drainage unit 20 is arranged below the road surface 60, and is used to collect water seepage from the bottom of the road surface 60 structure and drain it to the first longitudinal drainage unit 10, the second transverse drainage unit 30 is arranged below the first transverse drainage unit 20, and is used to collect water seepage from surrounding rocks and drain it to the second longitudinal drainage unit 40, and the second longitudinal drainage unit 40 is arranged below the first transverse drainage unit 20, and is used to drain the collected water to the roadbed ditch 50 outside the tunnel.

[0038] Furthermore, the first longitudinal drainage unit 10 includes two longitudinal roadside ditches 110 arranged on both sides of the tunnel pavement 60, and the longitudinal roadside ditches 110 are used to collect water from the pavement 60. As a preferred embodiment, the longitudinal roadside ditches 110 are buried ditches instead of open ditches, with a clearance size of 34×30 cm, and are reinforced concrete cast-in-place blocks, arranged along the entire length of the tunnel, mainly serving to connect the side ditch sand settling wells 111, and arranged on both sides of the tunnel. Furthermore, a movable cover plate can be set every 60 meters to facilitate the maintenance of the pipe groove.

[0039] As a preferred embodiment, the first longitudinal drainage unit 10 also includes two longitudinal cable trenches 120 corresponding one-to-one to the longitudinal roadside ditch 110, and the cable trenches are arranged on the outer side of the corresponding longitudinal roadside ditch 110. The bottom of each longitudinal cable trench 120 is provided with a longitudinal drainage groove 121 on the side close to the corresponding longitudinal roadside ditch 110, and the bottom of the longitudinal drainage groove 121 is higher than the bottom of the longitudinal roadside ditch 110. The side wall of the longitudinal cable trench 120 is provided with a first reserved drainage hole 122 connected to the longitudinal drainage groove 121, and the side wall of the longitudinal roadside ditch 110 is provided with a second reserved drainage hole 113 corresponding to the first reserved drainage hole 122. The accumulated water in the longitudinal drainage groove 121 is drained to the longitudinal roadside ditch 110 through the first reserved drainage hole 122 and the second reserved drainage hole 113.

[0040] It is worth noting that the normal operation of the longitudinal cable trench 120, as an important facility for power communication, requires that the cables in the facility be protected from water stains, and that water accumulation should not occur, which would affect the safe and stable operation of the facility. The weak cable trenches in tunnels are generally equipped with fire hoses. When the pipes are broken, water accumulation is likely to occur in the trenches, or water seepage on the upper part of the cable trench cover will also cause water accumulation in the cable trenches. In a preferred embodiment, a 5×5cm longitudinal drainage groove 121 is constructed at the bottom of the cable trench adjacent to the road, and a 5cm diameter HDPE drainage pipe is used to connect the longitudinal drainage groove 121 and the longitudinal roadside ditch 110 at a longitudinal interval of 10m, so that the accumulated water can be drained into the longitudinal roadside ditch 110 and discharged out of the cave. As a preferred example, the depth and width of the longitudinal drainage groove 121 are both set to 5cm.

[0041] As a preferred embodiment, the first transverse drainage unit 20 includes a transverse permeable blind pipe 210, which is arranged between the two longitudinal roadside ditches 110. The transverse permeable blind pipe 210 has a drainage slope toward the longitudinal roadside ditch 110. The longitudinal roadside ditch 110 is provided with a drainage hole 112 for the transverse permeable blind pipe 210 to penetrate. The transverse permeable blind pipe 210 drains the collected seepage water at the bottom of the pavement 60 structure into the longitudinal roadside ditch 110 by penetrating the drainage hole 112.

[0042] In this embodiment, the transverse permeable blind pipe 210 is laid under the reinforced concrete panel, from the left longitudinal roadside ditch 110 to the right longitudinal roadside ditch 110. The transverse permeable blind pipe 210 preferably adopts a 6×5 cm flat drainage pipe, and the two sides are filled with graded crushed stone. A 100 cm wide geotextile 220 is laid along the transverse permeable blind pipe 210 between the transverse permeable blind pipe 210 and the concrete panel. The transverse permeable blind pipe 210 is laid in the middle of the dark well 411 of the central longitudinal drainage ditch 410 at a spacing of 10m along the longitudinal direction of the tunnel to avoid conflict with it.

[0043] Furthermore, the second longitudinal drainage unit 40 includes a central longitudinal drainage ditch 410 located below the transverse permeable blind pipe 210, and the central longitudinal drainage ditch 410 extends along the extension direction of the tunnel. Figure 3-4 As shown, the central longitudinal drainage ditch 410 extends along the extension direction of the tunnel to the outside of the tunnel portal, and is drained into the roadbed side ditch 50 outside the tunnel through the drainage ditch 510, thereby achieving the purpose of water drainage.

[0044] As a preferred embodiment, the central longitudinal drainage ditch 410 is a prefabricated reinforced concrete circular pipe with a diameter of 60 cm, each section is 1 m long, and the interface is coated with 200g / m 2 The non-woven geotextile 220 is wrapped to prevent mud and sand from entering the pipe. Finally, the pipe sections at both ends are connected to the inspection well 412 or the blind well 411, and the water accumulated in the surrounding rock collected in the well is drained to the roadbed ditch 50 outside the tunnel through the drainage ditch 510. Compared with the traditional rectangular central ditch cast on site, the construction operability of this assembled central longitudinal drainage ditch 410 is greatly improved.

[0045] As a preferred embodiment, the second transverse drainage unit 30 includes two surrounding rock seepage diversion units 310 respectively arranged on both sides of the central longitudinal drainage ditch 410, each of the surrounding rock seepage diversion units 310 includes a corrugated pipe section 311 and a reinforced concrete pipe section 312, the water inlet end of the corrugated pipe section 311 is used to connect to the lining arch foot longitudinal drainage pipe 70, the water inlet end of the reinforced concrete pipe section 312 is connected to the water outlet end of the corrugated pipe section 311, and the water outlet end of the reinforced concrete pipe section 312 is connected to the central longitudinal drainage ditch 410 to drain the surrounding rock seepage to the central longitudinal drainage ditch 410.

[0046] Specifically, Figure 3 As shown, in the embodiment of the present application, the second transverse drainage unit 30 includes two surrounding rock seepage drainage units 310 respectively arranged on both sides of the central longitudinal drainage ditch 410, and the lining arch foot longitudinal drainage pipe 70 is an existing longitudinal drainage pipe in the lining, which is used to collect surrounding rock seepage; under the tunnel pavement 60 structure, a combination of a corrugated pipe section 311 and a reinforced concrete pipe section 312 is used. The reinforced concrete pipe section 312 not only has good mechanical properties, can withstand large external force impacts during construction and is not easy to break, but also has advantages in durability. As a preferred example, the corrugated pipe section 311 can be a HDPE corrugated pipe, and the reinforced concrete pipe section 312 can be a reinforced concrete circular pipe, for example, Reinforced concrete round pipe, each section is 2m long, two adjacent sections are placed and spliced, and 200g / m can be used at the interface 2 Wrapped with non-woven geotextile 220 to prevent sediment from entering the pipe. The structure is shown in the figure. Figure 3 , 5 , as shown in Figure 7.

[0047] Through the second transverse drainage unit 30 provided in this embodiment, the seepage water from the tunnel surrounding rock can be effectively drained to the central longitudinal drainage ditch 410 and finally discharged to the outside of the tunnel.

[0048] Furthermore, if Figure 4 As shown, the longitudinal roadside ditch 110 is provided with a plurality of grit wells 111 arranged at intervals along the extension direction of the longitudinal roadside ditch 110. The upper part of the grit well 111 can be covered with a cast iron grate, and the tunnel operation cleaning water, fire fighting water and other waste water can all be collected in the grit well 111. When the water in the well exceeds a certain height, it can be discharged out of the tunnel through the longitudinal roadside ditch 110. The inlet of the grit well 111 is slightly lower than the tunnel pavement 60, and the clearance size of the grit well 111 can be 67×34cm, and it is arranged at a spacing of 30m along the longitudinal direction of the tunnel.

[0049] Furthermore, if Figure 4As shown, the central longitudinal drainage ditch 410 is provided with a plurality of blind wells 411 arranged at intervals along the extension direction of the central longitudinal drainage ditch 410, and a plurality of inspection wells 412 arranged at intervals along the extension direction of the central longitudinal drainage ditch 410, and the blind wells 411 and the inspection wells 412 are arranged alternately along the extension direction of the central longitudinal drainage ditch 410. It should be noted that in order to avoid spatial conflict between the transverse permeable blind pipe 210 and the blind well 411 or the inspection well 412, the transverse permeable blind pipe 210 and the blind well 411 or the inspection well 412 can be arranged staggered.

[0050] Furthermore, if Figure 3 As shown, the outlet end of the corrugated pipe section 311 is located inside the corresponding longitudinal roadside ditch 110. It is worth noting that in the actual construction process, the corrugated pipe section 311 is pre-buried first and then the longitudinal roadside ditch 110 is poured, so that the corrugated pipe section 311 can be pre-buried in advance.

[0051] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A tunnel drainage system, characterized in that: It includes a first longitudinal drainage unit, a first transverse drainage unit, a second transverse drainage unit and a second longitudinal drainage unit, wherein: The first longitudinal drainage unit is used to collect water from the road surface and drain it to the roadbed ditch outside the tunnel. The first transverse drainage unit is arranged below the road surface, and is used to collect water seeping from the bottom of the road surface structure and drain it to the first longitudinal drainage unit. The second transverse drainage unit is arranged below the first transverse drainage unit, and is used to collect water seeping from the surrounding rock and drain it to the second longitudinal drainage unit. The second longitudinal drainage unit is arranged below the first transverse drainage unit, and is used to drain the collected water to the roadbed ditch outside the tunnel.

2. The tunnel drainage system according to claim 1, characterized in that: The first longitudinal drainage unit comprises two longitudinal roadside ditches arranged opposite to each other on both sides of the tunnel pavement, and the longitudinal roadside ditches are used to collect water from the pavement.

3. The tunnel drainage system according to claim 2, characterized in that: The first longitudinal drainage unit also includes two longitudinal cable trenches corresponding one to one with the longitudinal roadside ditches, the cable trenches are arranged on the outer sides of the corresponding longitudinal roadside ditches, the bottom of each longitudinal cable trench is provided with a longitudinal drainage groove on the side close to the corresponding longitudinal roadside ditch, the bottom of the longitudinal drainage groove is higher than the bottom of the longitudinal roadside ditch, the side wall of the longitudinal cable trench is provided with a first reserved drainage hole connected to the longitudinal drainage groove, the side wall of the longitudinal roadside ditch is provided with a second reserved drainage hole corresponding to the first reserved drainage hole, and the accumulated water in the longitudinal drainage groove is drained to the longitudinal roadside ditch through the first reserved drainage hole and the second reserved drainage hole.

4. The tunnel drainage system according to claim 2, characterized in that: The first transverse drainage unit includes a transverse permeable blind pipe, which is arranged between the two longitudinal roadside ditches. The transverse permeable blind pipe has a drainage slope toward the longitudinal roadside ditch. The longitudinal roadside ditch is provided with a drainage hole for the transverse permeable blind pipe to pass through. The transverse permeable blind pipe drains the collected seepage water at the bottom of the pavement structure into the longitudinal roadside ditch by passing through the drainage hole.

5. The tunnel drainage system according to claim 4, characterized in that: The second longitudinal drainage unit comprises a central longitudinal drainage ditch located below the transverse permeable blind pipe, and the central longitudinal drainage ditch extends along the extension direction of the tunnel.

6. The tunnel drainage system according to claim 5, characterized in that: The second transverse drainage unit includes two surrounding rock seepage drainage units respectively arranged on both sides of the central longitudinal drainage ditch, each of the surrounding rock seepage drainage units includes a corrugated pipe section and a reinforced concrete pipe section, the water inlet end of the corrugated pipe section is used to connect to the longitudinal drainage pipe of the lining arch foot, the water inlet end of the reinforced concrete pipe section is connected to the water outlet end of the corrugated pipe section, and the water outlet end of the reinforced concrete pipe section is connected to the central longitudinal drainage ditch to drain the surrounding rock seepage to the central longitudinal drainage ditch.

7. The tunnel drainage system according to claim 2, characterized in that: The longitudinal roadside ditch is provided with a plurality of ditch sand settling wells which are arranged at intervals along the extension direction of the longitudinal roadside ditch.

8. The tunnel drainage system according to claim 5, characterized in that: The central longitudinal drainage ditch is provided with a plurality of blind wells arranged at intervals along the extension direction of the central longitudinal drainage ditch, and a plurality of inspection wells arranged at intervals along the extension direction of the central longitudinal drainage ditch. The blind wells and the inspection wells are staggered along the extension direction of the central longitudinal drainage ditch.

9. The tunnel drainage system according to claim 6, characterized in that: The water outlet end of the corrugated pipe section is located on the inner side of the corresponding longitudinal roadside ditch.

10. The tunnel drainage system according to claim 3, characterized in that: The depth and width of the longitudinal drainage groove are both set to 5 cm.

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