Tunnel anti-crystallization drainage system

Abstract

According to the present application, a tunnel anti-crystallization drainage system is provided, comprising: an arch wall waterproof and drainage mechanism arranged on the inner wall of the tunnel, which comprises a primary support shotcrete layer, and a waterproof and drainage plate / waterproof plate and a circumferential drainage blind pipe fixed thereto; a longitudinal drainage blind pipe extending along the longitudinal direction of the tunnel; a drainage guide mechanism arranged at the bottom of the tunnel, which comprises a first transverse water guide pipe and a second transverse water guide pipe; wherein a first U-shaped sealer is arranged at the end of the first transverse water guide pipe in the side drainage ditch of the tunnel, a second U-shaped sealer is arranged at the end of the second transverse water guide pipe in the side drainage ditch of the tunnel and the central drainage ditch of the tunnel, and a side drainage ditch U-shaped sealer and a central drainage ditch U-shaped sealer are arranged at the corresponding inlet and outlet ends of the side drainage ditch and the central drainage ditch of the tunnel, respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel waterproof and drainage, in particular, to a tunnel anti-crystallization drainage system. BACKGROUND

[0002] The drainage system of a tunnel is an important link in the process of tunnel construction, normal use and safe operation. Taking a railway tunnel as an example, the drainage system is directly related to the success of railway tunnel construction and the exertion of the use function. At present, the drainage system of a railway tunnel generally uses cast-in-place concrete, and water leakage is the main disease type of railway tunnels in China. About 70% of railway tunnels have different degrees of water leakage, and about 30% of railway tunnels have serious water leakage. In particular, due to the influence of factors such as concrete materials and construction, crystallization blockage of tunnel drainage blind pipes, water channel siltation and other reasons lead to failure of the drainage system, which is the main reason for water damage in railway tunnels.

[0003] In the prior art, a drainage blind pipe is commonly used as a branch of the overall tunnel waterproof and drainage system, but crystallization blockage thereof can lead to overall failure of the tunnel waterproof and drainage system, thereby causing a series of diseases such as lining pressure cracking and joint leakage, thereby seriously affecting the safety, reliability, durability and operation safety of the tunnel structure. Therefore, for the drainage system of a railway tunnel in the prior art, once blockage of the drainage system occurs, there is no effective maintenance measure, thereby the maintenance is extremely poor, and long-term effective use of the drainage system cannot be guaranteed. In particular, for a railway tunnel, there are multiple possible water leakage positions. Different water leakage positions require different waterproof and drainage measures due to different conditions. How to comprehensively solve these water leakage hidden dangers and achieve effective waterproofing and drainage for the entire tunnel is a technical problem that needs to be solved in the field.

[0004] However, the maintenance and repair of the waterproof and drainage system of an operating railway tunnel at present mainly focuses on drainage ditch dredging, side ditch repair, water channel cover replenishment, tunnel water leakage treatment, improvement and addition of drainage equipment and the like. In addition, due to the diverse structure of the drainage pipeline of a railway tunnel, the longitudinal and transverse intersection and distribution in the tunnel structure, there is currently no effective maintenance method, and the supporting dredging tools and technology have not been formed, the dredging is difficult, and the blockage phenomenon is obvious. These all seriously affect the service state of the railway tunnel and the durability of the waterproof and drainage system. SUMMARY

[0005] In view of the above technical problems, the present application aims to provide a tunnel anti-crystallization drainage system, which comprises a sealing device arranged for a drainage guide mechanism, so as to realize full sealing of the tunnel drainage system, thereby effectively reducing the contact between groundwater in the tunnel drainage pipe and CO2 in the air, and effectively alleviating the generation of crystalline bodies in the drainage pipe.

[0006] According to the present application, a tunnel anti-crystallization drainage system is provided, comprising: an arch wall waterproofing and drainage mechanism arranged on the inner wall of the tunnel, the arch wall waterproofing and drainage mechanism comprising a primary support shotcrete layer, and a waterproofing and drainage plate / waterproof plate and a circumferential drainage blind pipe fixed thereto; a longitudinal drainage blind pipe arranged at the waterproofing and drainage plate in the tunnel springing area, the longitudinal drainage blind pipe extending along the longitudinal direction of the tunnel; a drainage guide mechanism arranged at the bottom of the tunnel, the drainage guide mechanism comprising a first transverse water guide pipe for connecting the longitudinal drainage blind pipe and a side drainage ditch of the tunnel bottom, and a second transverse water guide pipe for connecting the side drainage ditch and a central drainage ditch of the tunnel; wherein a first U-shaped sealer is arranged at the end of the first transverse water guide pipe in the side drainage ditch of the tunnel, and a second U-shaped sealer is arranged at the end of the second transverse water guide pipe in the side drainage ditch of the tunnel and the central drainage ditch of the tunnel, and a side drainage ditch U-shaped sealer and a central drainage ditch U-shaped sealer are respectively arranged at the corresponding inlet and outlet ends of the side drainage ditch and the central drainage ditch of the tunnel.

[0007] In a preferred embodiment, the end of the first and second U-shaped sealers is arranged flush with the bottom surface of the corresponding first transverse water guide pipe or second water guide pipe.

[0008] In a preferred embodiment, the end of the first and second U-shaped sealers is arranged higher than the bottom surface of the corresponding first transverse water guide pipe or second water guide pipe.

[0009] In a preferred embodiment, in the side drainage ditch of the tunnel, the second U-shaped sealer is arranged lower than the first U-shaped sealer.

[0010] In a preferred embodiment, in the side drainage ditch, the second U-shaped sealer is arranged at the same height as the first U-shaped sealer.

[0011] In a preferred embodiment, the first transverse water guide pipe and the second transverse water guide pipe are both arranged obliquely from outside to inside in the transverse direction.

[0012] In a preferred embodiment, the slope of the first transverse water guide pipe and the second transverse water guide pipe is arranged to be greater than 2%.

[0013] In a preferred embodiment, the first and second transverse water guide pipes, as well as the longitudinal drainage blind pipe and the circumferential drainage blind pipe, all adopt double-wall corrugated pipes, and the inner wall of the double-wall corrugated pipe is sprayed with a hydrophobic material.

[0014] In a preferred embodiment, first and second cover plates for sealing are respectively arranged on the side drainage ditch of the tunnel and the central drainage ditch of the tunnel.

[0015] In a preferred embodiment, the cross section of the side drainage ditch U-shaped sealers and the central drainage ditch U-shaped sealers is configured to be adaptable to the cross section of the side drainage ditch and the central drainage ditch.

[0016] In a preferred embodiment, the air content of the initial support shotcrete layer is not more than 5%. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A distribution structure of a tunnel anti-crystallization drainage system according to an embodiment of the present application is shown.

[0019] Figure 2 is Figure 1 A partial enlarged view of the middle region A.

[0020] Figure 3 A schematic view of Figure 2 The structure of the first or second sealer is shown.

[0021] In this application, all the drawings are schematic drawings, only for illustrating the principle of the present application, and are not drawn in actual proportion. DETAILED DESCRIPTION

[0022] The present application will be described below with reference to the accompanying drawings.

[0023] The present application will be described below with reference to the accompanying drawings.

[0024] Figure 1 A distribution structure of a tunnel anti-crystallization drainage system 100 according to an embodiment of the present application is shown. The tunnel anti-crystallization drainage system 100 mainly reduces the contact between the groundwater in the tunnel drainage pipe and the CO2 in the air through sealing arrangement, reduces the generation of crystallization in the tunnel drainage pipe, and thus keeps the tunnel drainage pipe unobstructed to ensure the drainage effect of the tunnel drainage pipe.

[0025] According to the present application, the tunnel anti-crystallization drainage system 100 comprises an arch wall waterproofing and drainage mechanism 200. In the tunnel construction, a primary support layer is usually arranged on the inner wall of the tunnel, which is usually formed by concrete. Then, the arch wall waterproofing and drainage mechanism 200 according to the present application is applied on the primary support layer. Optionally, a secondary formwork lining layer (not shown) can be arranged on the arch wall waterproofing and drainage mechanism 200.

[0026] As shown in Figure 1 , the arch wall waterproofing and drainage mechanism 200 comprises a primary support shotcrete layer 110. In one embodiment, the air content in the primary support shotcrete layer 110 is not more than 5%. This density of the primary support shotcrete layer 110 can particularly reduce the amount of water penetrating through the primary support shotcrete layer 110 in the inner wall of the tunnel, thereby reducing the loss of calcium ions and the generation of crystals. At the same time, the primary support shotcrete layer 110 can effectively reduce the content of hydroxyl ions, reduce the PH value of water, and reduce the generation of crystals by using an alkali-free accelerator

[0027] According to the present application, the arch wall waterproofing and drainage mechanism 200 further comprises waterproofing and drainage sheets / waterproofing sheets 210 arranged on the primary support shotcrete layer 110. In one embodiment, the waterproofing and drainage sheets / waterproofing sheets 210 can be coiled sheets made of PE. In this way, the arch wall waterproofing and drainage mechanism 200 not only can effectively prevent water, but also can effectively drain water from each other through the waterproofing and drainage sheets / waterproofing sheets 210. At the same time, a circumferential drainage blind pipe (not shown) is arranged in the inner wall of the tunnel, which is distributed circumferentially along the inner wall of the tunnel and is spaced apart at a certain distance along the longitudinal direction of the tunnel. The water in the inner wall of the tunnel is concentrated around the circumferential drainage blind pipe and penetrates into the circumferential drainage blind pipe through the shotcrete layer. The water in the circumferential drainage blind pipe flows to the bottom of both sides of the tunnel along the circumferential drainage blind pipe, and then is drained out of the tunnel through a drainage ditch, thereby achieving the drainage of the tunnel.

[0028] Through the arch wall waterproofing and drainage mechanism 200 according to the present application, the tunnel arch wall can be effectively waterproofed and drained.

[0029] In Figure 1In the shown embodiment, the end portion of the waterproofing / drainage plate 210 in the arch wall waterproofing mechanism 200 (at the arch foot area) is bent upward to form a U-shaped accommodating portion 211. A longitudinal drainage blind pipe 230 is arranged in the accommodating portion 211. The longitudinal drainage blind pipe 230 extends along the longitudinal direction of the tunnel and has a plurality of holes on its circumferential side. Meanwhile, the end portion of the circumferential drainage blind pipe on the inner wall of the tunnel is connected to the U-shaped accommodating portion 211. In this way, the water drained by the waterproofing / drainage plate 210 in the arch wall waterproofing mechanism 200 and the circumferential drainage blind pipe is collected in the accommodating portion 211 and enters the longitudinal drainage blind pipe 230 through the holes on the upper portion of the longitudinal drainage blind pipe 230 or through the permeation of the side wall of the longitudinal drainage pipe when the amount of water reaches a certain level.

[0030] According to the present application, a drainage guide mechanism 300 is arranged at the bottom of the tunnel. As shown in the drawings, Figure 1 The drainage guide mechanism 300 includes a first transverse water guide pipe 310 extending along the bottom of the tunnel. The first transverse water guide pipe 310 is connected to the longitudinal drainage blind pipe 230 at the bottom of the tunnel on one side and connected to the side drainage ditch 350 (shown schematically) arranged on both sides of the rail on the other side, so as to guide the water in the longitudinal drainage blind pipe 230 to the side drainage ditch 350 through the first transverse water guide pipe 310. In one embodiment, the diameter of the first transverse water guide pipe 310 can be 100 mm. In this way, the water collected in the longitudinal drainage blind pipe 230 in the inner wall of the tunnel is drained to the side drainage ditch 350 at the bottom of both sides of the tunnel through the first transverse water guide pipe 310, thereby achieving the preliminary drainage of the water in the tunnel drainage pipe.

[0031] In addition, the drainage guide mechanism 300 also includes a second transverse water guide pipe 320. As shown in the drawings, Figure 1As shown, the second lateral water guide pipe 320 is distributed along the tunnel bottom in the lateral direction, and one side of the second lateral water guide pipe 320 is connected with the side drainage ditch 350, and the other side is connected with the central drainage ditch 360 (shown schematically) arranged in the center of the tunnel bottom. Thus, the water in the side drainage ditch 350 on both sides of the tunnel bottom can be drained into the central drainage ditch 360 through the second lateral water guide pipe 320, and then drained out through the central drainage ditch 360 as the main drainage channel. Thus, the drainage guide mechanism 300 drains water through the first lateral water guide pipe 310 and the second lateral water guide pipe 320 in a hierarchical manner. When the amount of water in the tunnel is in a normal condition, the drainage guide mechanism 300 collects the water in the inner wall of the tunnel into the longitudinal drainage blind pipe 230 through the waterproof board 210 and the annular drainage blind pipe, and then guides the water in the longitudinal drainage blind pipe 230 into the side drainage ditch 350 through the first lateral water guide pipe 310, so as to realize the preliminary drainage of the water in the tunnel. When the amount of water in the side drainage ditch 350 exceeds the standard value, the side drainage ditch 350 cannot meet the drainage requirement, at this time, part of the water in the side drainage ditch 350 is drained out through the side drainage ditch 350, and the other part of the water flows to the central drainage ditch 360 through the second lateral water guide pipe 320, and then most of the water is drained out through the central drainage ditch 360. The drainage guide mechanism 300 enables the tunnel anti-crystallization drainage system 100 to effectively realize the drainage of the tunnel.

[0032] In the embodiment, the first lateral water guide pipe 310 and the second lateral water guide pipe 320 are arranged in a certain slope along the tunnel bottom in the lateral direction of the tunnel, so that the longitudinal drainage blind pipe 230 is connected with the side drainage ditch 350 on both sides of the rail through the first lateral water guide pipe 310. Preferably, the first lateral water guide pipe 310 is arranged such that the lateral outer side is higher than the lateral inner side, so that the water can flow from the longitudinal drainage blind pipe 230 into the side drainage ditch 350 smoothly. Meanwhile, the second lateral water guide pipe 320 is also arranged such that the lateral outer side is higher than the lateral inner side, and further, the water can flow into the central drainage ditch 360 through the second lateral water guide pipe 320. In an embodiment, the slope of the first lateral water guide pipe 310 and the second lateral water guide pipe 320 is greater than 2%. The diameter of the longitudinal drainage blind pipe 230 can be, for example, 100 mm. The first lateral water guide pipe 310 can have the same specification as the second lateral water guide pipe 320. This arrangement of the first lateral water guide pipe 310 and the second lateral water guide pipe 320 is particularly advantageous for the flow of water in the drainage pipe, and improves the drainage performance of the drainage guide mechanism 300.

[0033] Through the above structure, the water drained out by the arch wall waterproof mechanism 200 can be guided into the longitudinal drainage blind pipe 230, and then further flow into the side drainage ditch 350 and the central drainage ditch 360. In this way, each mechanism in the entire tunnel anti-crystallization drainage system 100 forms an organic drainage device.

[0034] In the process of tunnel drainage, the tunnel is usually long and has a large size in the transverse direction (also referred to as the ring direction). Meanwhile, the components in the tunnel concrete are complex, the water permeating into the drainage blind pipe contains various substances, and the CO2 in the air entering from the drainage blind pipe port reacts with the water in the drainage blind pipe, thereby generating crystals in the drainage pipe and sticking and depositing on the inner wall of the drainage blind pipe to cause the drainage blind pipe to be blocked. The partial water leakage holes of the tunnel and the partial crystallization of the drainage blind pipe are more serious, and even the drainage blind pipe is blocked. This seriously affects the drainage effect of the tunnel drainage device, and the crystals are easy to block the in-hole drainage device, cause concrete defects, and even affect the safety of the tunnel structure and the safety of the later operation.

[0035] Therefore, the drainage guide mechanism 300 in the tunnel anti-crystallization drainage system 100 according to the present application is also provided with a sealer for realizing overall sealing of the tunnel anti-crystallization drainage system 100. As shown in Figure 1 The sealer includes a first U-shaped sealer 400 arranged at one end of the first transverse water guide pipe 310 in the side drainage ditch 350, and a second U-shaped sealer 410 arranged at both ends of the second transverse water guide pipe 320, i.e. arranged at the ports of the second transverse water guide pipe 320 in the side drainage ditch 350 and the center drainage ditch 360. Thus, when a certain amount of water accumulates in the first transverse water guide pipe 310 and the second transverse water guide pipe 320, the water accumulates in the first U-shaped sealer 400 or the second U-shaped sealer 410 and flows out from the ports of the first U-shaped sealer 400 or the second U-shaped sealer 410 into the drainage ditch to be discharged from the tunnel. In this process, the water in the first U-shaped sealer 400 can seal the first transverse water guide pipe 310, and the water in the second U-shaped sealer 410 can seal the second transverse water guide pipe 320, so that the drainage guide mechanism 300 realizes overall sealing to reduce the contact area between the water in the drainage blind pipe, the first transverse water guide pipe 310 and the second transverse water guide pipe 320 and the CO2 in the air, effectively alleviate the generation of crystals, and effectively avoid the generation of crystals in the drainage pipe to cause the drainage pipe to be blocked.

[0036] As shown in Figure 2 It is Figure 1Enlarged view of the middle region A. In the illustrated embodiment, the first lateral water guide pipe 310 and the second lateral water guide pipe 320 are connected to the side drainage ditch 350 at a region close to the bottom, which is convenient for drainage and also facilitates the sealing of the first lateral water guide pipe 310 or the second lateral water guide pipe 320 by the first U-shaped seal 400 or the second U-shaped seal 410, respectively. In one embodiment, in the side drainage ditch 350, the second U-shaped seal 410 on the second lateral water guide pipe 320 is arranged to be higher than the height of the first U-shaped seal 400 at the end of the first lateral water guide pipe 310 in the vertical direction. In this way, when the amount of water to be drained is small, drainage can be achieved only through the side drainage ditch 350. When the amount of water to be drained is large due to a large amount of water accumulated in the tunnel, the amount of water in the side drainage ditch 350 increases, and when the water reaches the height of the second U-shaped seal 410 at the end of the second lateral water guide pipe 320, the water can flow to the central drainage ditch 360 through the second lateral water guide pipe 320 to achieve drainage of a large amount of water. Of course, it can be understood that the first lateral water guide pipe 310 and the second lateral water guide pipe 320 can be connected to a relatively high position of the side drainage ditch 350, so that when the groundwater accumulated in the side drainage ditch 350 reaches a certain amount and the water surface reaches a certain height, the water can also flow to the central drainage ditch 360, thereby achieving step-by-step drainage at different amounts of water.

[0037] In addition, in the side drainage ditch 350, the first U-shaped seal 400 arranged at the first lateral water guide pipe 310 and the second U-shaped seal 410 arranged at the end of the second lateral water guide pipe 320 can be distributed at a certain distance apart in the longitudinal direction of the tunnel, which can reduce the influence of drainage between the U-shaped seals 400 and facilitate improvement of the drainage effect. Of course, it can be understood that the first U-shaped seal 400 and the second U-shaped seal 410 can also be arranged at the same longitudinal position of the tunnel, which can also meet the requirement of guiding water into the central drainage ditch 360 for drainage of a large amount of water when the amount of water to be drained is large.

[0038] Figure 3 The structure of the first U-shaped seal 400 or the second U-shaped seal 410 shown in FIG. 4 is schematically shown. Figure 2 The structure of the first U-shaped seal 400 or the second U-shaped seal 410 shown in FIG. 4 is schematically shown. Figure 3As shown, the first U-shaped seal 400 is arranged at the end of the first transverse water guide pipe 310. In one embodiment, the free end port of the first U-shaped seal 400 is arranged to be flush with the bottom of the pipe of the first transverse water guide pipe 310. In this way, when groundwater (the shaded part 315 in the figure) is collected in the first transverse water guide pipe 310 and fills the first U-shaped seal 400, the groundwater in the first U-shaped seal 400 can effectively form a seal, thereby avoiding the contact of water in the first transverse water guide pipe 310 with CO2 in the air, effectively alleviating the generation of crystalline bodies, and avoiding the blockage of the drain pipe due to the generation of crystalline bodies in the drain pipe. Of course, it can be understood that the free end port of the first U-shaped seal 400 can be arranged to be higher than the bottom of the pipe of the first transverse water guide pipe 310, which can further improve the sealing performance of the first U-shaped seal 400.

[0039] According to the present application, the drain pipes used in the tunnel anti-crystallization drainage system 100, such as the annular blind drain pipe, the longitudinal blind drain pipe 230, the first transverse water guide pipe 310, and the second transverse drain pipe 320, can all be double-walled corrugated pipes. Preferably, the inner wall of the pipe is sprayed with a hydrophobic material, which can reduce the adhesion of crystalline bodies to the inner wall of the pipe, thereby effectively improving the smoothness and stain resistance of the drain pipe. At the same time, the absolute roughness of the inner wall of the drain pipe is not greater than 0.005 mm, and the change in stain resistance reflectivity is not greater than 20%, which can effectively alleviate the adhesion and accumulation of crystalline bodies on the inner wall of the drain pipe. Further improve the drainage performance of the tunnel anti-crystallization drainage system 100.

[0040] In addition, the first cover plate 351 is arranged on the side drainage ditch 350, and the second cover plate 361 is arranged on the center drainage ditch 360, which can reduce the entry of CO2 into the side drainage ditch 350 or the center drainage ditch 360, thereby reducing the generation of crystalline bodies in the side drainage ditch 350 and the center drainage ditch 360, avoiding the blockage of the drain pipe and the drainage ditch due to excessive crystalline bodies, and being beneficial to improve the drainage performance of the tunnel anti-crystallization drainage system 100.

[0041] In order to further enhance the sealing performance of the tunnel anti-crystallization drainage system 100, a side drainage ditch U-shaped sealer (not shown) is arranged at the inlet and outlet of the side drainage ditch 350 on both sides of the tunnel bottom. Meanwhile, a center drainage ditch U-shaped sealer (not shown) is arranged at the inlet and outlet of the center drainage ditch 360 on the tunnel bottom. In one embodiment, the cross-sectional shape of the side drainage ditch U-shaped sealer is the same as that of the side drainage ditch 350, and the size is also the same. Similarly, the cross-sectional shape of the center drainage ditch U-shaped sealer is the same as that of the center drainage ditch 360, and the size is also the same. In this way, the sealing performance of the side drainage ditch 350 and the center drainage ditch 360 can be effectively enhanced, thereby effectively enhancing the sealing performance of the tunnel anti-crystallization drainage system 100, further reducing the generation of crystallization, effectively avoiding the blockage of the drainage pipe, and improving the drainage performance of the tunnel anti-crystallization drainage system 100.

[0042] The tunnel anti-crystallization drainage system 100 according to the present application can be used in a railway tunnel. The present application can absorb and guide the moisture in the tunnel inner wall to the bottom on both sides of the tunnel by arranging the waterproof board 210 and the circumferential drainage blind pipe. The underground water guided to the bottom on both sides of the tunnel by the waterproof board 210 and the circumferential drainage blind pipe 230 is discharged through the longitudinal drainage blind pipe 230, and then guided to the drainage ditch arranged on the tunnel bottom through the transverse water guide pipe. In order to avoid the blockage of the drainage pipe caused by the reaction between the underground water and CO2 in the air to generate crystallization, the first U-shaped sealer 400 or the second U-shaped sealer 410 is arranged at the end of the transverse water guide pipe in the drainage ditch. The first U-shaped sealer 400 and the second U-shaped sealer 410 can effectively seal the tunnel anti-crystallization drainage system 100, reduce the contact area between the water in the transverse water guide pipe and CO2 in the air, effectively alleviate the generation of crystallization, effectively avoid the blockage of the drainage pipe caused by the generation of crystallization in the drainage pipe, and improve the drainage performance of the tunnel anti-crystallization drainage system 100.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present application and does not constitute any limitation on the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A tunnel anti-crystallization drainage system (100), comprising: an arch wall waterproofing mechanism (200) arranged on the inner wall of the tunnel, the arch wall waterproofing mechanism comprising a primary support shotcrete layer, and a waterproofing board / waterproof board (210) and a circumferential drainage blind pipe fixed thereto, wherein the air content of the primary support shotcrete layer is not greater than 5%, and the primary support shotcrete layer reduces the generation of crystals by using an alkali-free accelerator, reducing the content of hydroxyl ions, reducing the pH value of water; a longitudinal drainage blind pipe (230) arranged at the tunnel arch foot area of the waterproofing board / waterproof board, the longitudinal drainage blind pipe extending along the longitudinal direction of the tunnel; a drainage guide mechanism (300) arranged at the bottom of the tunnel, the drainage guide mechanism comprising a first transverse water guide pipe (310) for connecting the longitudinal drainage blind pipe and a side drainage ditch (350) at the bottom of the tunnel, and a second transverse water guide pipe (320) for connecting the side drainage ditch and a central drainage ditch (360) of the tunnel; wherein a first U-shaped sealer (400) is arranged at the end of the first transverse water guide pipe at the side drainage ditch, a second U-shaped sealer (410) is arranged at the end of the second transverse water guide pipe at the side drainage ditch and the central drainage ditch of the tunnel, and a side drainage ditch U-shaped sealer and a central drainage ditch U-shaped sealer are arranged at the corresponding inlet and outlet ends of the side drainage ditch and the central drainage ditch of the tunnel, the end of the first U-shaped sealer is arranged higher than the bottom surface of the first transverse water guide pipe, and the end of the second U-shaped sealer is arranged flush with the bottom surface of the second transverse water guide pipe, in the side drainage ditch, the second U-shaped sealer is arranged higher than the first U-shaped sealer, and the first U-shaped sealer and the second U-shaped sealer are distributed with a certain distance in the longitudinal direction of the tunnel.

2. The tunnel anti-crystallization drainage system according to claim 1, characterized in that, The first transverse water guide pipe and the second transverse water guide pipe are both arranged downwardly and inwardly in the transverse direction.

3. The tunnel anti-crystallization drainage system according to claim 2, characterized in that, The slope of the first transverse water guide pipe and the second transverse water guide pipe is greater than 2%.

4. The tunnel anti-crystallization drainage system according to claim 1 or 2, characterized in that, The first and second transverse water guide pipes, as well as the longitudinal drainage blind pipe and the circumferential drainage blind pipe, all adopt double-wall corrugated pipes, and the inner wall of the double-wall corrugated pipes is sprayed with a hydrophobic material.

5. The tunnel anti-crystallization drainage system according to claim 1, characterized in that, First and second cover plates (351) and (361) for sealing are arranged on the side drainage ditch and the central drainage ditch of the tunnel, respectively.

6. The tunnel anti-crystallization drainage system according to claim 1, characterized in that, The cross section of the side drainage ditch U-shaped sealer and the central drainage ditch U-shaped sealer is configured to be adapted to the cross section of the side drainage ditch and the central drainage ditch.

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