Road tunnel ring drainage pipe structure

Abstract

The utility model discloses a kind of highway tunnel annular drainage pipe structures, the left end of transverse drainage pipe is connected with annular PE drainage pipe bottom, the right end of transverse drainage pipe is connected to grit chamber;Grit chamber is double-layer open structure, the upper layer section of grit chamber is rectangle, the lower layer section is right-angle trapezium, the lower layer left end of grit chamber is provided with circular hole for the right end of transverse drainage pipe transmission, the lower layer right end of grit chamber is provided with pipe joint, pipe joint is connected with PVC drainage pipe, PVC drainage pipe is L type, the lower end of drainage pipe is accessed into tunnel side ditch;The upper layer of grit chamber is covered with top cover, top cover includes toughened glass layer and outer package stainless steel frame, outer package stainless steel frame both ends are equipped with handle.The application can deposit the silt, gravel and other sundries behind lining in grit chamber, maintenance personnel can easily observe whether drainage system needs cleaning, whole process can be operated on maintenance way, greatly reduce maintenance cost and construction operation risk.

Description

Technical Field

[0001] This utility model relates to the field of tunnel drainage, specifically to a circumferential drainage pipe structure for highway tunnels. Background Technology

[0002] As service time increases, the drainage system of highway tunnels deteriorates, leading to frequent blockages. Field investigations and research indicate that the partial failure of the drainage system behind the lining is one of the core mechanisms inducing blockages in the overall tunnel drainage system. The mechanism manifests as follows: solid materials such as mud, gravel, and calcium deposits precipitated from groundwater in the surrounding rock of the lining cannot be effectively discharged due to the failure of the drainage system behind the lining. These materials either directly deposit and solidify within the circumferential drainage pipes behind the lining, or flow through the circumferential and transverse drainage pipes and eventually migrate to the tunnel drainage ditches, where they deposit, causing secondary blockages. This can reduce the tunnel's drainage capacity or, in severe cases, damage the structure and ensure traffic safety. Cleaning existing highway tunnel ditches requires significant manpower and resources, and construction work on the tunnel surface also poses certain safety risks. Utility Model Content

[0003] To address the aforementioned problems, this utility model aims to provide a visually appealing and easily maintained circumferential drainage pipe structure for highway tunnels.

[0004] To achieve this technical objective, the present invention provides a circumferential drainage pipe structure for a highway tunnel, comprising a semi-circular circumferential PE drainage pipe and a transverse drainage pipe, wherein the left end of the transverse drainage pipe is connected to the bottom of the circumferential PE drainage pipe and the right end of the transverse drainage pipe is connected to a sedimentation tank.

[0005] The sedimentation tank has a double-layer open structure. The upper layer of the sedimentation tank has a rectangular cross-section, and the lower layer has a right-angled trapezoidal cross-section. A circular hole is opened at the left end of the lower layer of the sedimentation tank for the right end of the horizontal drainage pipe to enter. A pipe joint is provided at the right end of the lower layer of the sedimentation tank. The pipe joint is connected to a PVC drainage pipe. The PVC drainage pipe is L-shaped, and the lower end of the drainage pipe is connected to the tunnel side ditch.

[0006] The upper part of the sedimentation tank is covered with a top cover, which includes a tempered glass layer and an outer stainless steel frame. The outer stainless steel frame has handles at both ends.

[0007] Preferably, the left end of the transverse drainage pipe is connected to the bottom of the circumferential PE drainage pipe at a 120° angle, and the whole pipe is buried at the foot of the tunnel sidewall at an angle of 8° downward from left to right.

[0008] Preferably, the pipe joint is provided with an L-shaped groove arranged in a C-shape.

[0009] Preferably, a replaceable filter screen is installed in the L-shaped slot, the surface of the filter screen has a porous hollow structure, and the right end of the filter screen is provided with a frame-type handle.

[0010] Preferably, the lower right end of the sedimentation tank is provided with a pipe joint that is inclined downward at 5-10°, and the position of the circular hole on the left end is 2-3cm higher than the pipe joint on the right.

[0011] Preferably, the horizontal drainage pipe is a PVC pipe with a diameter of 110mm.

[0012] Preferably, the length of the top cover along the longitudinal direction of the highway tunnel is 40cm.

[0013] The beneficial effects of this utility model are: This application can settle the mud, sand, gravel and other debris behind the lining in the sedimentation tank, and maintenance personnel can easily observe whether the drainage system needs to be cleaned. Through the horizontal drainage pipe, maintenance personnel can inspect and dredge the circumferential drainage pipe. The entire operation can be carried out on the inspection road, which greatly reduces maintenance costs and construction risks. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model in actual use;

[0016] Figure 3 This is an enlarged view of the sedimentation tank in this utility model;

[0017] Figure 4 This is a top view of the sedimentation tank in this utility model.

[0018] In the diagram: 1. Circumferential PE drain pipe; 2. Horizontal drain pipe; 3. Sedimentation tank; 4. PVC drain pipe; 5. Pipe joint; 6. Top cover; 7. L-shaped groove; 8. Filter screen. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To provide a clear and complete description of the technical solution, the following embodiments are selected for illustration; these embodiments are only some embodiments of the present invention; other embodiments obtained based on this application without creative effort are all within the scope of protection of the present invention.

[0020] In the following embodiments, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top / bottom," etc., are all based on the orientation or positional relationship shown in the accompanying drawings and are only for the purpose of clearly describing this embodiment. They do not indicate or imply that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this application. At the same time, the terms "first" and "second" in the embodiments are only used for descriptive purposes and do not represent an indication or implication of relative importance.

[0021] like Figure 1-4 As shown, a specific embodiment of this utility model is a circumferential drainage pipe structure for a highway tunnel, including a semi-circular circumferential PE drainage pipe 1, a transverse drainage pipe 2, a sedimentation tank 3, and a PVC drainage pipe 4. The circumferential PE drainage pipe 1 is pre-embedded in the initial support surface. Its semi-circular design conforms to the curved surface of the support, increasing the water passage cross-section. Furthermore, the PE material is corrosion-resistant, preventing the adhesion of calcification crystals. The left end of the transverse drainage pipe 2 connects to the bottom of the circumferential PE drainage pipe, and the right end extends to the sedimentation tank 3 area. The sedimentation tank 3 adopts a double-layer open structure: the upper layer has a rectangular cross-section, with dimensions matching the maintenance road cover; the lower layer has a right-angled trapezoidal cross-section. The trapezoidal structure expands the sedimentation solvent, and the left end of the lower layer has a circular hole for the transverse drainage pipe 2 to pass through, while the right end has a pipe joint 5.

[0022] The sedimentation tank 3 is also covered by a top cover 6, which is 40cm long along the longitudinal direction of the highway tunnel. The top cover 6 is composed of a 2cm thick tempered glass layer and an outer stainless steel frame. The top cover 6 allows for visual monitoring of the sedimentation status without disassembly, improving efficiency. Handles are welded to both ends of the frame. The PVC drainage pipe 4 is L-shaped, with the upper end connected to the pipe joint 5 of the sedimentation tank 3 and the lower end connected to the tunnel side ditch to prevent backflow into the ditch.

[0023] In a preferred embodiment of this solution, the left end of the transverse drainage pipe 2 is connected to the bottom of the circumferential PE drainage pipe at a 120° angle. This obtuse angle design avoids sharp bends that can cause blockages, meets the minimum turning radius of the endoscopic push rod, and is installed at an 8° downward angle from left to right at the foot of the tunnel sidewall, forming a gravity-driven direct current to increase flow velocity and prevent sediment deposition. A pipe joint 5 is installed at the lower right end of the sedimentation tank 3, tilted downwards, and the circular hole at the left end is 52cm higher than the pipe joint on the right, forming a water seal to prevent debris from floating. The transverse drainage pipe 2 uses a 110mm diameter PVC pipe to ensure flexible dredging.

[0024] In a preferred embodiment of this solution, the drainage of the sedimentation tank 3 is also filtered and maintained. The pipe joint 5 is provided with an L-shaped slot arranged in a C-shape to form a horizontal insertion and removal track for the filter screen 8. A replaceable filter screen 8 is installed in the L-shaped slot. The surface of the filter screen 8 has a porous hollow structure and the right end of the filter screen 8 is provided with a frame-type handle. The anti-clogging strength of the filter screen 8 is increased by 3 times, and replacement does not require tools.

[0025] This structure allows for targeted design of the tunnel drainage system during the tunnel design phase. After operation, tunnel maintenance personnel can easily reduce debris entering the tunnel side ditch by regularly cleaning the sedimentation tank 3. It also allows for unblocking of the circumferential drainage pipes, effectively ensuring the drainage capacity of the tunnel's side drainage ditches. The process includes the following steps:

[0026] (1) Burying of circumferential PE drainage pipes: After the initial support work is completed, clean the surface of the initial support to ensure that it is flat, clean, and free of debris or sharp protrusions. Lay the circumferential drainage pipes at the designed spacing and fix them with plastic clips or geotextile.

[0027] (2) Installation of transverse drainage pipe 2: Before the tunnel lining construction, the transverse drainage pipe 2 is installed at the bottom of the circumferential drainage pipe and connected to the tunnel circumferential drainage pipe by a straight connection, and the lining concrete is poured.

[0028] (3) Install sedimentation tank 3: Install sedimentation tank 3 on the left vertical wall of the tunnel inspection road, and the horizontal drainage pipe 2 passes through the circular opening at the lower left end of sedimentation tank 3;

[0029] (3) Construct the right vertical wall of the maintenance passage: Erect the formwork for the vertical wall of the maintenance passage, reinforce it according to the specifications, and pour the inclined wall on the right side of the maintenance passage.

[0030] (4) Installation of replaceable filter screen 8: Insert the replaceable filter screen 8 into the L-shaped slot arranged in a C-shape at the right end of the lower layer of the sedimentation tank 3;

[0031] (5) Installation of tempered glass top cover 6: Place the tempered glass top cover 6 on the upper layer of the sedimentation tank 3;

[0032] (6) Connection between sedimentation tank 3 and PVC drainage pipe 4: Wipe the moisture and dust off the part of the pipe joint 5 at the lower right end of sedimentation tank 3 that needs to be bonded with a cotton cloth. If there is oil, remove it with acetone. Apply adhesive with a brush, first apply it to the upper socket of PVC drainage pipe 4 and then apply it to the joint of sedimentation tank 3. Then insert it vertically with force. When inserting and bonding, rotate PVC drainage pipe 4 slightly to make the adhesive evenly distributed. Connect the lower end of PVC drainage pipe to the tunnel side ditch.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present utility model should be included within the protection scope of the technical solution of the present utility model.

Claims

1. A highway tunnel circumferential drainage pipe structure comprising a semi-circular circumferential PE drainage pipe, characterized in that: It also includes a horizontal drainage pipe, the left end of which is connected to the bottom of the circumferential PE drainage pipe, and the right end of which is connected to the sedimentation tank. The sedimentation tank has a double-layer open structure. The upper layer of the sedimentation tank has a rectangular cross-section, and the lower layer has a right-angled trapezoidal cross-section. A circular hole is opened at the left end of the lower layer of the sedimentation tank for the right end of the horizontal drainage pipe to enter. A pipe joint is provided at the right end of the lower layer of the sedimentation tank. The pipe joint is connected to a PVC drainage pipe. The PVC drainage pipe is L-shaped, and the lower end of the drainage pipe is connected to the tunnel side ditch. The upper part of the sedimentation tank is covered with a top cover, which includes a tempered glass layer and an outer stainless steel frame. The outer stainless steel frame has handles at both ends.

2. The highway tunnel circumferential drainage pipe structure according to claim 1, characterized by: The left end of the horizontal drainage pipe is connected to the bottom of the circumferential PE drainage pipe at a 120° angle, and the whole structure is buried at the foot of the tunnel sidewall at an 8° downward angle from left to right.

3. The highway tunnel ring drain structure according to claim 2, wherein: The pipe joint is provided with an L-shaped groove arranged in a C-shape.

4. The highway tunnel ring drain structure according to claim 3, characterized in that: A replaceable filter screen is installed in the L-shaped slot. The surface of the filter screen has a porous hollow structure, and the right end of the filter screen is provided with a frame-type handle.

5. The highway tunnel circumferential drainage pipe structure according to claim 1, characterized by: The lower right end of the sedimentation tank is equipped with a pipe joint that is inclined downwards at 5-10°, and the position of the circular hole on the left end is 2-3cm higher than the pipe joint on the right.

6. The highway tunnel circumferential drainage pipe structure according to claim 1, characterized by: The horizontal drainage pipe is a PVC pipe with a diameter of 110mm.

7. The highway tunnel circumferential drainage pipe structure according to claim 1, characterized by: The length of the top cover along the longitudinal direction of the highway tunnel is 40cm.

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