Waterproof and drainage structure for mid-partition wall of double-arch tunnel in water-rich environment

Abstract

The utility model provides a waterproof and drainage structure for a mid-partition wall of a double-arch tunnel in a water-rich environment, which comprises a top annular drainage semicircular pipe, a wall body annular drainage semicircular pipe, a longitudinal drainage pipe, a wall bottom longitudinal drainage pipe and a transverse drainage pipe, the top annular drainage semicircular pipe and the longitudinal drainage pipe, the wall body annular drainage semicircular pipe and the longitudinal drainage pipe, the bottom longitudinal drainage pipe and the wall body annular drainage semicircular pipe, and the wall bottom longitudinal drainage pipe and the transverse drainage pipe are connected through a three-way pipe respectively, and the transverse drainage pipe penetrates through the side wall of the multi-arch tunnel to be connected with a longitudinal drainage ditch. Water flow is drained into a tunnel drainage ditch through the annular drainage semicircular pipe, the longitudinal drainage pipe, the wall body annular drainage semicircular pipe, the wall bottom longitudinal drainage pipe and the transverse drainage pipe, the drainage efficiency is high, the reliability is good, the mid-partition wall and a backfill structure are firmly combined, it can be guaranteed that the mid-partition wall and a primary support are well combined, and mountain pressure can be evenly transmitted to the mid-partition wall; the middle partition wall is reasonable in stress, and overall instability damage is not prone to occurring.

Description

Technical Field

[0001] This utility model relates to the technical field of tunnel drainage, and in particular to a drainage and waterproofing structure for the partition wall of a double-arch tunnel in a water-rich environment. Background Technology

[0002] Tunnels have become an important form of highway crossing high mountains. Among them, arch tunnels have been widely used due to their advantages such as greater freedom of location selection, suitability for complex terrain, smaller land area occupied by approach roads, easier connection, smooth road alignment, and aesthetically pleasing cross-section.

[0003] However, in some water-rich strata, the top of the tunnel partition wall is the collection point of fissure water in the surrounding rock between the centerlines of the up and down tunnels. Moreover, there is an indispensable construction joint at the connection between the secondary lining concrete of the up and down tunnels and the concrete of the partition wall, which is an unavoidable structural defect. This can easily lead to water seepage in the tunnel arch section, affecting the aesthetics and durability of the tunnel wall. At the same time, during tunnel operation, water seepage can cause the road surface to become slippery, increasing the safety hazards of driving. Therefore, preventing water leakage in the tunnel partition wall is a problem that urgently needs to be solved. Utility Model Content

[0004] This utility model aims to provide a drainage structure for the central partition wall of a double-arch tunnel in a water-rich environment. It can drain water from the fissures behind the surrounding rock into the drainage ditches on both sides of the tunnel road surface through the drainage structure of the central partition wall, ensuring smooth drainage at the weak points of water seepage in the arch of the central partition wall and preventing water leakage quality problems.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a drainage structure for the central partition wall of a double-arch tunnel in a water-rich environment, including a double-arch tunnel and a central partition wall. The top of the central partition wall is longitudinally embedded with top circumferential drainage semicircular pipes at intervals. The sides of the central partition wall are longitudinally embedded with wall circumferential drainage semicircular pipes close to the double-arch tunnel. The lowest points on both sides of the top of the central partition wall are embedded with longitudinal drainage pipes. Adjacent top circumferential drainage semicircular pipes and longitudinal drainage pipes, as well as wall circumferential drainage semicircular pipes and longitudinal drainage pipes, are connected by tee pipes. The bottom of the central partition wall is longitudinally embedded with wall bottom longitudinal drainage pipes and transverse drainage pipes at intervals. Adjacent wall bottom longitudinal drainage pipes and wall circumferential drainage semicircular pipes, as well as wall bottom longitudinal drainage pipes and transverse drainage pipes, are also connected by tee pipes. The transverse drainage pipe passes through the side wall of the double-arch tunnel and is connected to a longitudinal drainage ditch.

[0006] As a preferred embodiment of the above scheme, a non-woven geotextile and an EVA waterproof board with a thickness between 1.4 and 1.6 mm are laid between the secondary lining and the initial support of the arch tunnel, and the circumferential drainage semi-circular pipe of the wall is set between the secondary lining and the initial support.

[0007] More preferably, the longitudinal spacing of the top circumferential drainage semicircular pipe, the wall circumferential drainage semicircular pipe, the wall bottom longitudinal drainage pipe and the transverse drainage pipe is between 4 and 8 m.

[0008] More preferably, the diameter of the longitudinal drainage pipe, the top circumferential drainage semicircular pipe, the wall circumferential drainage semicircular pipe, the bottom longitudinal drainage pipe, and the transverse drainage pipe is all φ100.

[0009] More preferably, the joints of the three-way pipes are all wrapped with non-woven geotextile.

[0010] A further preferred embodiment is that the longitudinal arch tunnel is provided with longitudinal pipe inspection wells at staggered intervals, and the distance between the longitudinal pipe inspection wells is 50m.

[0011] A further preferred embodiment is that the top circumferential drainage semicircular pipe is arched in the middle, with one end higher than the other, to facilitate drainage from the top of the partition wall.

[0012] The beneficial effects of this utility model are as follows: Water flow from the top of the wall is introduced into the longitudinal drainage pipe through the circumferential drainage semicircular pipe, which in turn introduces water flow into the circumferential drainage semicircular pipe of the wall body, which then introduces water flow into the longitudinal drainage pipe at the bottom of the wall. The longitudinal drainage pipe at the bottom of the wall is connected to the transverse drainage pipe, allowing the water to flow into the tunnel drainage ditch. This results in high drainage efficiency and good reliability. The central partition wall is firmly integrated with the backfill structure, ensuring good integration between the central partition wall and the initial support, and that the pressure from the mountain can be evenly transmitted to the central partition wall. The central partition wall is subjected to reasonable stress and is not prone to overall instability and failure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing arch tunnel structure.

[0014] Figure 2 This is a schematic diagram of the existing integrated drainage system inside a multi-arch tunnel (single tunnel).

[0015] Figure 3 This is a schematic diagram of the waterproof and drainage structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the connection of the three-way pipe of this utility model.

[0017] Figure 5 yes Figure 3 Enlarged view of point A in the image. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1As shown, the connection between the central partition wall and the arch is a stress concentration area, which is prone to cracks. At the same time, if the joint is not properly treated during construction, it can easily form a water seepage channel; water seeps into the central partition wall from the arch along the joint, causing the wall surface to be damp or dripping.

[0020] Cracks are prone to form at the connection between the partition wall and the base slab due to foundation settlement or construction quality issues, allowing groundwater to seep in through these cracks; water seepage or accumulation may occur at the junction of the base slab and the partition wall.

[0021] The partition wall is usually constructed in sections. If the construction joint is not properly treated (such as the waterstop is not installed tightly or the concrete is not poured densely), it is easy to become a seepage point; linear seepage or local dampness may appear at the construction joint.

[0022] The partition wall may develop cracks due to temperature changes, concrete shrinkage, or external loads, allowing groundwater to seep in through these cracks; irregular cracks may appear on the wall surface, accompanied by water seepage.

[0023] like Figure 2 As shown, the existing integrated drainage system inside the arch tunnel has insufficient design capacity for drainage ditches, sump pits and pipes, or the drainage path is too long, resulting in reduced efficiency and inability to remove large amounts of accumulated water in a timely manner.

[0024] Inadequate filtration facilities or insufficient daily maintenance can easily clog drainage ditches, collection wells, and pipes with silt, garbage, and other debris, affecting drainage performance.

[0025] like Figure 3-5 As shown, a drainage and waterproofing structure for a central partition wall in a double-arch tunnel in a water-rich environment includes the arch tunnel and a central partition wall. A non-woven geotextile 7 and an EVA waterproof membrane with a thickness between 1.4 and 1.6 mm are laid between the secondary lining and the initial support of the arch tunnel. A circumferential drainage semi-circular pipe 3 is installed between the secondary lining and the initial support. The joints of the tee pipes 6 are all wrapped with non-woven geotextile 7. The non-woven geotextile 7 serves as a filter layer, possessing a uniform pore structure that effectively filters moisture while preventing soil particle loss and preventing sediment from entering the drainage pipes and clogging the drainage channels. The EVA waterproof membrane effectively prevents water seepage into the arch tunnel, ensuring the tunnel's safety and stability.

[0026] The top of the partition wall is longitudinally interspersed with semi-circular top drainage pipes 2. The sides of the partition wall are longitudinally interspersed with semi-circular wall drainage pipes 3 close to the arch tunnel. The lowest points on both sides of the top of the partition wall are longitudinally interspersed with drainage pipes 1. Adjacent semi-circular top drainage pipes 2 and longitudinal drainage pipes 1, and semi-circular wall drainage pipes 3 and longitudinal drainage pipes 1 are connected by tee pipes 6. The bottom of the partition wall is longitudinally interspersed with longitudinal drainage pipes 4 and transverse drainage pipes 5. Adjacent longitudinal drainage pipes 4 and semi-circular wall drainage pipes 3, and longitudinal drainage pipes 4 and transverse drainage pipes 5 are also connected by tee pipes 6. The transverse drainage pipes 5 pass through the side wall of the arch tunnel and are connected to a longitudinal drainage ditch.

[0027] Connecting the drainage pipes via the T-joint 6 ensures even water distribution at branching or confluence points, preventing localized blockages or excessive flow, reducing pressure loss in the pipes, and improving the overall efficiency of the drainage system. The pipe system connected by the T-joint 6 allows for segmented management and maintenance, facilitating the location and resolution of blockages or leaks.

[0028] The longitudinal spacing of the top circumferential drainage semicircular pipe 2, the wall circumferential drainage semicircular pipe 3, the wall bottom longitudinal drainage pipe 4, and the transverse drainage pipe 5 is all between 4 and 8 meters. In this embodiment, the drainage pipes are set at 5-meter intervals, which can ensure the overall drainage performance of the tunnel, ensure that the drainage pipes can collect and transport water evenly, avoid local water accumulation or poor drainage; it is easy to clean and maintain, reduces the risk of sediment (such as silt and garbage) accumulation in the pipes, and reduces the occurrence of blockages.

[0029] The diameters of the longitudinal drainage pipe 1, the top circumferential semi-circular drainage pipe 2, the wall circumferential semi-circular drainage pipe 3, the bottom longitudinal drainage pipe 4, and the transverse drainage pipe 5 are all φ100. This design is suitable for medium-flow drainage needs, has relatively low cost, high cost-effectiveness, and is suitable for large-scale use.

[0030] The arch tunnel is equipped with longitudinal pipe inspection manholes spaced 50m apart. These manholes provide access to the pipes, allowing staff to inspect their internal condition and promptly detect blockages or damage. They also facilitate the removal of sediment (such as silt and debris) from the pipes, ensuring unobstructed drainage.

[0031] The top circumferential drainage semicircular pipe 2 is arched in the middle, with one end higher than the other, to facilitate drainage from the top of the partition wall.

[0032] Water flow from the top of the wall is introduced into the longitudinal drainage pipe 1 through the circumferential drainage semicircular pipe. The longitudinal drainage pipe 1 then introduces the water flow into the circumferential drainage semicircular pipe 3 within the wall body. The circumferential drainage semicircular pipe 3 further introduces the water flow into the longitudinal drainage pipe 4 at the bottom of the wall. The longitudinal drainage pipe 4 at the bottom of the wall is connected to the transverse drainage pipe 5, allowing the water to flow into the tunnel drainage ditch. This method ensures high drainage efficiency and reliability. The central partition wall is firmly integrated with the backfill structure, ensuring good integration between the central partition wall and the initial support. The pressure from the mountain can be evenly transmitted to the central partition wall, resulting in reasonable stress distribution and reducing the risk of overall instability and failure.

[0033] Waterstops 8 are installed at both the construction joints and expansion joints of the arch tunnel. The construction joints use embedded rubber waterstops, while the expansion joints use either back-adhesive or embedded rubber waterstops. The waterstops 8 prevent moisture from seeping in through the joints or cracks of the tunnel structure, blocking water and reducing its erosion of the tunnel's concrete, steel reinforcement, and other materials, thus extending the tunnel's service life. The waterstops also reduce the risk of cracking and maintain the integrity of the tunnel structure.

[0034] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A waterproof and drainage structure of a middle partition wall in a double-arch tunnel in a water-rich environment, comprising an arch tunnel and a middle partition wall, characterized in that: The top of the partition wall is longitudinally spaced and embedded with top annular drainage half-round pipes (2), the wall body is longitudinally spaced and embedded with wall body annular drainage half-round pipes (3) close to the multi-arch tunnel, the lowest point of the two sides of the top of the partition wall is embedded with longitudinal drainage pipes (1), the three-way pipes (6) are connected between the adjacent two top annular drainage half-round pipes (2) and the longitudinal drainage pipes (1), the three-way pipes (6) are connected between the wall body annular drainage half-round pipes (3) and the longitudinal drainage pipes (1), the bottom of the partition wall is longitudinally spaced and embedded with wall bottom longitudinal drainage pipes (4) and transverse drainage pipes (5), the three-way pipes (6) are also connected between the adjacent two wall bottom longitudinal drainage pipes (4) and the wall body annular drainage half-round pipes (3), the three-way pipes (6) are also connected between the wall bottom longitudinal drainage pipes (4) and the transverse drainage pipes (5), and the transverse drainage pipes (5) are connected with longitudinal drainage ditches through the side walls of the multi-arch tunnel.

2. The waterproof structure of the partition wall in the double-arch tunnel in the water-rich environment according to claim 1, characterized in that: The secondary lining of the multi-arch tunnel is provided with non-woven geotextile (7) and EVA waterproof plates with a thickness of 1.4-1.6 mm between the primary support, and the wall body annular drainage half-round pipes (3) are arranged between the secondary lining and the primary support.

3. The waterproof structure of the di-arch tunnel with a partition wall in a water-rich environment according to claim 1, characterized in that: The longitudinal spacing of the top annular drainage half-round pipes (2), the wall body annular drainage half-round pipes (3), the wall bottom longitudinal drainage pipes (4) and the transverse drainage pipes (5) is 4-8 m.

4. The waterproofing structure of the partition wall in the double-arch tunnel in the water-rich environment according to claim 3, characterized in that: The diameters of the longitudinal drainage pipes (1), the top annular drainage half-round pipes (2), the wall body annular drainage half-round pipes (3), the wall bottom longitudinal drainage pipes (4) and the transverse drainage pipes (5) are all φ100.

5. The waterproof structure of the di-arch tunnel with a partition wall in a water-rich environment according to claim 1, characterized in that: The joints of the three-way pipes (6) are all wrapped with non-woven geotextile (7).

6. The waterproof structure of the di-arch tunnel with a partition wall in a water-rich environment according to claim 1, characterized in that: The multi-arch tunnel is longitudinally staggered and spaced to be provided with longitudinal pipe inspection wells, and the spacing between the longitudinal pipe inspection wells is 50 m.

7. The waterproof structure of the di-arch tunnel with a partition wall in a water-rich environment according to claim 1, characterized in that: The middle part of the top annular drainage half-round pipe (2) is arched, and one end is higher than the other end.

Images