Tunnel drainage system and construction method thereof

Abstract

A tunnel drainage system and construction method thereof, the system comprising an annular drainage pipe arranged along the tunnel cross section and longitudinal drainage pipes arranged on both sides of the tunnel; the bottom of the annular drainage pipe is connected to the longitudinal drainage pipe, and the longitudinal drainage pipes on both sides are connected to the central drainage pipe through transverse drainage pipes, the longitudinal drainage pipe as a whole having a serrated structure, the longitudinal drainage pipes on both sides of the bottom of the annular drainage pipe are arranged in an inverted "V" shape, and the longitudinal drainage pipes on both sides of the transverse drainage pipe are arranged in a positive "V" shape; the transverse drainage pipes on both sides of the central drainage pipe are arranged in a positive "V" shape; a decrystallization device is provided on the transverse drainage pipe, which is an ultrasonic vibration decrystallization device. The inverted "V" and positive "V" shape arrangements can effectively reduce the drainage pressure of the drainage system, improve the drainage capacity of the drainage pipe, effectively improve the reverse drainage caused by the traditional single-slope drainage method, reduce pipe blockage, and increase the service life of the drainage pipe; the decrystallization device is based on ultrasonic vibration to shatter crystals in the pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a tunnel drainage system and a construction method thereof. Background Art

[0002] Tunnel engineering has become a crucial hub for interregional urban development, serving as a bridge between upstream and downstream. However, water leakage caused by clogged drainage pipes is a recurring problem, leading to the saying that "nine out of ten tunnels leak." The principle of "preventing drainage, intercepting, and blocking" and conventional drainage design are no longer sufficient to address current issues such as pipe blockage, leakage, and crystallization.

[0003] In the prior art, a Chinese patent application numbered CN202221032596.X discloses a karst water-rich tunnel anti-crystallization blockage drainage system, which includes an annular drainage pipe, a longitudinal drainage pipe, a transverse water diversion pipe, a reserved acid injection pipe, and a central drainage pipe. The bottom of the annular drainage pipe is connected to the longitudinal drainage pipe, the longitudinal drainage pipe is connected to the central drainage pipe through the transverse water diversion pipe, and the reserved acid injection pipe is arranged in parallel on the top of the central drainage pipe and is connected to the central drainage pipe.

[0004] However, in the above-mentioned prior art, a "T-shaped" connection is formed between the longitudinal drainage pipe, the transverse drainage pipe, and the annular drainage pipe. The longitudinal drainage pipe is provided with a single slope drainage, which is discharged through the central drainage pipe or ditch. However, this design is prone to reverse drainage, which further causes poor drainage of the drainage pipe, resulting in pipe blockage, leakage, crystallization and other defects, affecting its normal operation.

[0005] In addition, among the decrystallization technologies used in tunnels, the patent application with application number CN202111510498.2 discloses a directional accelerated crystallization device and method of use for tunnel drainage systems, which takes into account the influence of temperature, flow rate, chemicals, crystallization pool shape and surface morphology on the crystallization of tunnel water bodies, and can realize the idea of ​​directional crystallization of tunnel drainage systems. For example, the patent application with application number CN202111023150.0 discloses a hydrodynamic-chemical crystallization coupling numerical simulation method and system based on level set, and constructs a karst water crystallization blockage model for drainage pipes that considers the coupling of pipeline hydrodynamic field, concentration field and chemical reaction field. At the same time, it considers the process of crystallization blockage of drainage pipes under the joint action of three factors: temperature, ion concentration and flow rate, and characterizes the moving boundary displacement based on the level set method, and then carries out numerical simulation of crystallization blockage of karst tunnel drainage pipes.

[0006] However, the above-mentioned existing decrystallization technologies use pipe flocking, addition of chemical reagents, biological enzyme degradation, etc., and the decrystallization process will produce harmful substances. In addition, the use of traditional drainage design may cause reverse drainage during the drainage process. Under the dual influence, the hazards such as pipe blockage, leakage, crystallization, etc. will be aggravated, and environmental pollution will be caused. Summary of the Invention

[0007] The main purpose of the present invention is to provide a tunnel drainage system and a construction method thereof, aiming to solve the above technical problems.

[0008] To achieve the above-mentioned purpose, on the one hand, the present invention provides a tunnel drainage system, comprising an annular drainage pipe arranged along the cross section of the tunnel and longitudinal drainage pipes arranged on both sides of the tunnel; the bottom of the annular drainage pipe is connected to the longitudinal drainage pipe, and the longitudinal drainage pipes on both sides are connected to the central drainage pipe through transverse drainage pipes. In the longitudinal section, the longitudinal drainage pipe is generally in a serrated structure, the longitudinal drainage pipes on both sides of the bottom of the annular drainage pipe are in an inverted "V" shape, and the longitudinal drainage pipes on both sides of the transverse drainage pipe are in a positive "V" shape; in the transverse section, the transverse drainage pipes on both sides of the central drainage pipe are in a positive "V" shape; a decrystalline device is provided on the transverse drainage pipe, which is an ultrasonic vibration decrystalline device. The inverted "V" and positive "V" arrangements can effectively reduce the drainage pressure of the drainage system and improve the drainage capacity of the drainage pipe. The "V"-shaped left and right drainage effectively improves the reverse drainage caused by the traditional single-slope drainage method, reduces the pipe blockage to a certain extent, and increases the service life of the drainage pipe; the decrystalline device is based on ultrasonic vibration to shatter the crystals in the pipe, thereby also reducing the crystal blockage of the pipe.

[0009] Preferably, the decrystallization device includes a decrystallization pool and a filtration pool, the decrystallization pool and the filtration pool are connected through a filter screen, and an ultrasonic vibrator is provided in the decrystallization pool.

[0010] Preferably, the filter comprises a fine-mouth filter and a coarse-mouth filter, which are welded to a rectangular frame formed by an I-beam. The coarse-mouth filter is positioned above the fine-mouth filter, with a reserved orifice provided between the top of the coarse-mouth filter and the rectangular frame. The fine-mouth filter can intercept sand, stone, or coarse crystals, allowing for secondary removal. When the flow rate increases, the coarse-mouth filter can reduce the water pressure on the fine-mouth filter. The reserved orifice effectively prevents damage caused by excessively high water levels or sudden increases in flow rate.

[0011] Preferably, the ultrasonic vibrator is vertically suspended, and a trumpet-shaped expander is provided on the outside of the ultrasonic vibrator.

[0012] Preferably, an inspection port is provided on the top plate of the decrystallization tank; a maintenance ladder is provided at the top of the decrystallization tank. The maintenance ladder, combined with the inspection port, allows for the operation of the decrystallization device to be checked at any time, regular maintenance or replacement of the ultrasonic equipment, and the removal of large sand and stone particles. This effectively avoids blockage caused by residual filter residue or large crystals in the decrystallization device, improves the pipe's drainage capacity, and reduces pipe blockage.

[0013] Preferably, a power supply area is provided on one side of the maintenance ladder. The power supply area is provided with an on / off switch and is connected to the ultrasonic vibrator via an electrical line. The power supply area is located next to the maintenance ladder and includes an on / off switch that can start or stop the ultrasonic vibrator at any time. This not only improves electrical safety, but also effectively controls the removal period and rationally removes crystal blockages.

[0014] Preferably, the transverse drainage pipe adopts a PVC pipe with a diameter of ⌀75mm; the longitudinal drainage pipe adopts a corrugated pipe with a diameter of ⌀110mm; and the annular drainage pipe adopts an HPDE single-wall corrugated pipe with a diameter of ⌀50mm.

[0015] Preferably, the bottom of the annular drainage pipe is connected to the longitudinal drainage pipe through a forward tee joint, and the longitudinal drainage pipe is connected to the transverse drainage pipe through a reverse tee joint. Geotextiles are provided at the connection points of the forward tee joint and the reverse tee joint for anti-seepage.

[0016] Preferably, the forward tee joint and the reverse tee joint are both 150° tee joints.

[0017] On the other hand, the present invention also provides a construction method of the above-mentioned tunnel drainage system, comprising the following steps:

[0018] Step S1: After the initial support of the tunnel, the circumferential drainage pipe, the longitudinal drainage pipe, and the transverse drainage pipe are constructed so that the longitudinal drainage pipe has a zigzag structure as a whole;

[0019] Step S2: After the drainage pipes are arranged, a prefabricated or cast-in-place degranulator is hoisted and installed. When the degranulator is prefabricated or cast-in-place, the filter screen should be installed and constructed at the same time, and the degranulator should be connected to the horizontal drainage pipe;

[0020] Step S3: Install a central drain pipe and connect it to the lateral drain pipes to form a drainage channel;

[0021] Step S4: Before the secondary lining and invert construction, reserve a power supply area and an inspection ladder area;

[0022] Step S5: construct the secondary lining and invert arch, and close the ring;

[0023] Step S6: constructing an inspection ladder and installing an ultrasonic vibrator;

[0024] Step S7: Turn on the power to check the vibration of the ultrasonic vibrator and the water-passing capacity of the filter.

[0025] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0026] First: In the present invention, the longitudinal drainage pipe has a serrated structure as a whole, and the longitudinal drainage pipes on both sides of the bottom of the annular drainage pipe are distributed in an inverted "V" shape, and the longitudinal drainage pipes on both sides of the transverse drainage pipe are distributed in a positive "V" shape. The inverted "V" and positive "V" arrangements can effectively reduce the drainage pressure of the drainage system and improve the drainage capacity of the drainage pipe. The "V"-shaped left and right drainage effectively improves the reverse drainage caused by the traditional single-slope drainage method, reduces pipe blockage to a certain extent, and increases the service life of the drainage pipe.

[0027] Second: In the present invention, the crystal removal device uses ultrasonic vibration to break crystals. The crystal removal device is divided into a crystal removal pool and a filtration pool. Ultrasonic waves and horn-type expanders are installed in the crystal removal pool to effectively reduce pipeline crystallization. The filtration pool is connected to the filter screen. The filter screen is divided into a fine-mouth filter screen, a coarse-mouth filter screen and a reserved orifice. The fine-mouth filter screen can intercept sand, stone or coarse-grained crystals, and the intercepted objects can be broken for a second time. When the flow rate increases, the coarse-mouth filter screen can reduce the water pressure of the fine-mouth filter screen, and the setting of the reserved orifice can effectively avoid the hazards caused by excessively high water levels or sudden increases in flow rate.

[0028] Third: In the present invention, by setting up an inspection ladder, the ultrasonic equipment can be regularly repaired or replaced, and large-particle sand and stone can be removed, which can effectively avoid the blockage hazards caused by the remaining filter residue or large crystals in the decrystallization device, improve the pipeline's water-repellent capacity and alleviate pipeline blockage.

[0029] Fourth: The power supply area is set next to the maintenance ladder and includes an on-off switch, which can start or shut down the ultrasonic vibrator at any time. This not only improves the safety of electricity use, but also effectively controls the breaking period and reasonably breaks the crystal blockage.

[0030] Fifth, the de-crystallization device can be cast-in-place or prefabricated. The technical principles are easy to understand, requiring no specialized technical personnel, and construction is flexible. This technology effectively mitigates the hazards of pipe blockage and reduces subsequent tunnel operation and maintenance costs. It provides lifelong benefits from one-time commissioning and extends the service life of drainage pipes.

[0031] Sixth: Ultrasonic waves are sound waves, and breaking crystals through sound wave vibrations is a physical process. This process does not produce harmful substances. When it flows out through the filter and the central drain pipe, it will not cause pollution to the surrounding environment, effectively protecting the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of the structural design of the tunnel drainage system provided by the present invention;

[0034] Figure 2 Schematic diagram of the longitudinal drain pipe in the present invention showing a zigzag structure;

[0035] Figure 3 yes Figure 1 Large-scale drawing of point B in the middle.

[0036] Figure 4 yes Figure 1 Large sample picture at point C in the middle.

[0037] Figure 5 It is a schematic diagram of the filter installation and construction structure in the present invention.

[0038] Figure 6 It is a schematic diagram of the arrangement of the central drain pipe and the transverse drain pipe in the present invention.

[0039] Figure 7 This is a schematic diagram of the connection between the forward tee joint and the annular drain pipe and the longitudinal drain pipe in the present invention;

[0040] Figure 8 This is a schematic diagram of the connection between the reverse tee joint and the horizontal drain pipe and the vertical drain pipe in the present invention;

[0041] Figure 9 It is a process schematic diagram of a construction method of a tunnel drainage system provided by the present invention.

[0042] Explanation of the accompanying numbers: 1. Horizontal drainage pipe; 2. Longitudinal drainage pipe; 3. Circular drainage pipe; 4. Central drainage pipe; 5. De-crystallization tank; 6. Filtration tank; 7. Expander; 8. Ultrasonic vibrator; 9. Power line; 10. Coarse filter screen; 11. Fine filter screen; 12. Reserved orifice; 13. I-beam; 14. Weld; 15. Water flow direction; 16. Maintenance ladder; 17. Maintenance port; 18. Forward tee joint; 19. Reverse tee joint; 20. Power supply area; 21. Geotextile. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] Combine Figures 1 to 8 As shown, a tunnel drainage system includes an annular drain pipe 3 arranged along the tunnel cross section and longitudinal drain pipes 2 arranged on both sides of the tunnel. The bottom of the annular drain pipe 3 is connected to the longitudinal drain pipe 2, and the longitudinal drain pipes 2 on both sides are connected to the central drain pipe 4 through transverse drain pipes 1. In the longitudinal cross section, the longitudinal drain pipe 2 is generally serrated. The longitudinal drain pipes 2 on both sides of the bottom of the annular drain pipe 3 are arranged in an inverted "V" shape, and the longitudinal drain pipes 2 on both sides of the transverse drain pipe 1 are arranged in a positive "V" shape. In the transverse cross section, the transverse drain pipes 1 on both sides of the central drain pipe 4 are arranged in a positive "V" shape. A decrystalline device is installed on the transverse drain pipe 1, which is an ultrasonic vibration decrystalline device. The inverted "V" and positive "V" shape arrangements can effectively reduce the drainage pressure of the drainage system and improve the drainage capacity of the drainage pipe. The "V" shape drainage effectively improves the reverse drainage caused by the traditional single-slope drainage method, reduces pipe blockage to a certain extent, and increases the service life of the drainage pipe. The decrystalline device uses ultrasonic vibration to shatter crystals in the pipe, thereby reducing crystal blockage in the pipe.

[0046] The decrystallization device includes a decrystallization pool 5 and a filtration pool 6 . The decrystallization pool 5 and the filtration pool 6 are connected via a filter screen. An ultrasonic vibrator 8 is provided in the decrystallization pool 5 .

[0047] The filter screen includes a fine-mouth filter screen 11 and a coarse-mouth filter screen 10, which are welded in a rectangular frame formed by an I-beam 13; the coarse-mouth filter screen 10 is arranged above the fine-mouth filter screen 11, and a reserved orifice 12 is provided between the top of the coarse-mouth filter screen 10 and the rectangular frame. The sizes of the fine-mouth filter screen 11 and the coarse-mouth filter screen 10 can be determined comprehensively based on the actual project water level and flow rate. The fine-mouth filter screen 11 can intercept sand, stone or coarse crystals, and the intercepted materials can be broken down a second time. When the flow rate increases, the coarse-mouth filter screen 10 can reduce the water pressure of the fine-mouth filter screen 11, and the provision of the reserved orifice 12 can effectively avoid the hazards caused by excessively high water levels or sudden increases in flow rate.

[0048] The ultrasonic vibrator 8 is vertically suspended and has a frequency of 50kHz to 60kHz. A trumpet-shaped amplifier 7 is provided on the outside of the ultrasonic vibrator 8 .

[0049] An inspection port 17 is provided on the top plate of the decrystallization pool 5; an inspection ladder 16 is provided on the top of the decrystallization pool 5. The inspection ladder 16 should be simple and convenient in layout, with high strength, and its size can be determined according to the actual project value, and there should be a certain horizontal distance between the inspection ladder 16 and the inspection port 17 to facilitate the removal of debris in the pool. There is no fixed requirement for the size of the inspection port 17, and its design should be suitable for facilitating the cleaning work. The inspection ladder 16 combined with the inspection port 17 can check the working condition of the decrystallization device at any time, regularly repair or replace the ultrasonic equipment, and remove large-particle sand and stone, which can effectively avoid the blockage hazards caused by the remaining filter residue or large crystals in the decrystallization device, improve the pipe drainage capacity and reduce pipe blockage.

[0050] A power supply area 20 is provided on one side of the maintenance ladder 16. The power supply area 20 is equipped with an on / off switch and is connected to the ultrasonic vibrator 8 via the power line 9. The power supply voltage is 220V. The power supply area 20 is located next to the maintenance ladder 16 and includes an on / off switch that can start or shut down the ultrasonic vibrator 8 at any time. This not only improves electrical safety, but also effectively controls the removal period and rationally removes crystal blockages.

[0051] The horizontal drainage pipe 1 adopts a PVC pipe with a diameter of ⌀75mm; the longitudinal drainage pipe 5 adopts a corrugated pipe with a diameter of ⌀110mm; and the annular drainage pipe 3 adopts an HPDE single-wall corrugated pipe with a diameter of ⌀50mm.

[0052] The bottom of the annular drainage pipe 3 is connected to the longitudinal drainage pipe 2 via a forward tee joint 18, and the longitudinal drainage pipe 2 is connected to the transverse drainage pipe 1 via a reverse tee joint 19. Geotextiles 21 are provided at the connection points of the forward tee joint 18 and the reverse tee joint 19.

[0053] The forward tee joint 18 and the reverse tee joint 19 are both 150° tee joints.

[0054] Combine Figure 9 As shown, the construction method of the tunnel drainage system includes the following steps:

[0055] Step S1: After the initial support of the tunnel, the circumferential drainage pipe 3, the longitudinal drainage pipe 2, and the transverse drainage pipe 1 are constructed so that the longitudinal drainage pipe 2 has a zigzag structure as a whole;

[0056] Step S2: After the drainage pipe is arranged, a prefabricated or cast-in-place degranulator is hoisted and installed. When the degranulator is prefabricated or cast-in-place, the filter screen should be installed and constructed at the same time, and the degranulator should be connected to the horizontal drainage pipe 1;

[0057] Step S3: Install the central drain pipe 4 and connect it to the horizontal drain pipe 1 to form a drainage channel;

[0058] Step S4: Before the secondary lining and invert construction, reserve the power supply area 20 and the maintenance ladder 16 area;

[0059] Step S5: construct the secondary lining and invert arch, and close the ring;

[0060] Step S6: construct the maintenance ladder 16 and install the ultrasonic vibrator 8;

[0061] Step S7: Turn on the power to check the vibration of the ultrasonic vibrator 8 and the water-passing capacity of the filter.

[0062] The process also includes step S8: after the tunnel is put into operation, the ultrasonic vibrator 8 is regularly maintained and the pollution is cleaned through the maintenance ladder 16 and the reserved maintenance port 17 in combination with the power supply area 20.

[0063] In this embodiment, except for the given concrete filling area, the inverted arch can be filled with red mud materials, sand and gravel waste, and low-grade concrete.

[0064] In the present invention, the longitudinal drainage pipe 2 adopts an inverted "V" shape and a positive "V" shape arrangement, which can effectively relieve the drainage pressure of the pipeline and prevent reverse drainage. The decrystallization device includes a decrystallization pool 5 and a filtration pool 6. The ultrasonic vibrator 8 and the horn-type expander 7 installed in the decrystallization pool 5 can effectively reduce the amount of crystallization in the pipeline. The filtration pool 6 is connected to the filter screen, and the filter screen is fixed by welding with the I-beam 13. The welding part forms a weld 14. The filter screen is divided into a fine-mouthed filter screen 11 and a coarse-mouthed filter screen 10, and is provided with a reserved orifice 12. The fine-mouthed filter screen 11 can intercept sand, stone or coarse-grained crystals, and the intercepted objects can be broken for a second time. When the flow rate increases, the coarse-mouthed filter screen 10 can reduce the water pressure of the fine-mouthed filter screen and assist the fine-mouthed filter screen in filtering water together. The setting of the reserved orifice 12 can effectively avoid the hazards caused by excessively high water levels or sudden increases in flow, and play a role in safety protection. Supporting facilities also include a power supply area 20, an inspection ladder 16, and an inspection hatch 17. These allow for regular maintenance or replacement of the ultrasonic equipment and the removal of large sand and stone particles, effectively preventing blockages caused by residual filter residue or large crystals in the decrystallization device and improving the pipeline's water-repelling capacity. Furthermore, the ultrasonic decrystallization process is a physical process that does not produce harmful substances or gases, thus preventing environmental pollution. This design is easy to maintain, and the decrystallization device can be prefabricated or cast in place, allowing for flexible construction. This not only effectively addresses pipeline blockages, reverse drainage, and leakage, but also protects the environment, saves tunnel operating and maintenance costs, and extends the tunnel's service life.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A tunnel drainage system, comprising an annular drainage pipe (3) arranged along a tunnel cross section and longitudinal drainage pipes (2) arranged on both sides of the tunnel; the bottom of the annular drainage pipe (3) is connected to the longitudinal drainage pipe (2), and the longitudinal drainage pipes (2) on both sides are connected to the central drainage pipe (4) through transverse drainage pipes (1), characterized in that: In the longitudinal cross section, the longitudinal drainage pipe (2) is in a serrated structure as a whole, the longitudinal drainage pipes (2) on both sides of the bottom of the annular drainage pipe (3) are in an inverted "V" shape, and the longitudinal drainage pipes (2) on both sides of the transverse drainage pipe (1) are in a positive "V" shape; in the transverse cross section, the transverse drainage pipes (1) on both sides of the central drainage pipe (4) are in a positive "V" shape; a crystal removal device is provided on the transverse drainage pipe (1), which is an ultrasonic vibration crystal removal device; The decrystallization device comprises a decrystallization pool (5) and a filtration pool (6), the decrystallization pool (5) and the filtration pool (6) are connected via a filter screen, and an ultrasonic vibrator (8) is provided in the decrystallization pool (5); The filter screen comprises a fine-mouth filter screen (11) and a coarse-mouth filter screen (10), wherein the fine-mouth filter screen (11) and the coarse-mouth filter screen (10) are welded in a rectangular frame formed by an I-beam (13); the coarse-mouth filter screen (10) is arranged above the fine-mouth filter screen (11), and a reserved orifice (12) is provided between the top of the coarse-mouth filter screen (10) and the rectangular frame.

2. A tunnel drainage system according to claim 1, characterized in that: The ultrasonic vibrator (8) is vertically suspended, and a trumpet-shaped expansion (7) is provided on the outside of the ultrasonic vibrator (8).

3. The tunnel drainage system according to claim 1, characterized in that: An inspection port (17) is provided on the top plate of the decrystallization tank (5); and an inspection ladder (16) is provided on the top of the decrystallization tank (5).

4. A tunnel drainage system according to claim 3, characterized in that: A power supply area (20) is provided on one side of the maintenance ladder (16). The power supply area (20) is provided with an on / off switch and is connected to the ultrasonic vibrator (8) via a power supply line (9).

5. The tunnel drainage system according to claim 1, characterized in that: The transverse drainage pipe (1) adopts a PVC pipe with a diameter of ⌀75 mm; the longitudinal drainage pipe (5) adopts a corrugated pipe with a diameter of ⌀110 mm; and the annular drainage pipe (3) adopts an HPDE single-wall corrugated pipe with a diameter of ⌀50 mm.

6. The tunnel drainage system according to claim 1, characterized in that: The bottom of the annular drainage pipe (3) is connected to the longitudinal drainage pipe (2) via a forward tee joint (18), and the longitudinal drainage pipe (2) is connected to the transverse drainage pipe (1) via a reverse tee joint (19). Geotextile gauze (21) is provided at the connection between the forward tee joint (18) and the reverse tee joint (19).

7. A tunnel drainage system according to claim 6, characterized in that: The forward tee joint (18) and the reverse tee joint (19) are both 150° tee joints.

8. A construction method for a tunnel drainage system according to claim 1, characterized in that: The following steps are involved: Step S1: After the initial support of the tunnel, the circumferential drainage pipe (3), the longitudinal drainage pipe (2), and the transverse drainage pipe (1) are constructed so that the longitudinal drainage pipe (2) has a zigzag structure as a whole; Step S2: After the drainage pipe is arranged, a prefabricated or cast-in-place decrystalline device is hoisted and installed. When the decrystalline device is prefabricated or cast-in-place, the filter screen should be installed and constructed at the same time, and the decrystalline device should be connected to the horizontal drainage pipe (1); Step S3: installing the central drain pipe (4) and connecting it to the horizontal drain pipe (1) to form a drainage channel; Step S4: Before the secondary lining and invert construction, reserve a power supply area (20) and an inspection ladder (16) area; Step S5: construct the secondary lining and invert arch, and close the ring; Step S6: constructing the maintenance ladder (16) and installing the ultrasonic vibrator (8); Step S7: Turn on the power to check the vibration of the ultrasonic vibrator (8) and the water-passing capacity of the filter.

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