Existing tunnel lining leakage water drainage structure

Abstract

The utility model discloses an existing tunnel lining leakage water drainage structure, relates to the field of tunnel lining structures, and aims to solve the problem of poor tunnel stability after existing tunnel lining leakage water disease treatment, in a region with serious leakage water, a secondary lining is chiseled away to form a stepped groove, a first groove accommodates a water diversion pipe to collect leakage water, and a second groove accommodates a water diversion pipe to collect leakage water. And a reinforcing mesh is laid in the second groove and connected with anchor rods implanted into the surrounding rock to form a reinforcing structure, so that the strength of the tunnel after the secondary lining is chiseled away is guaranteed, and the stability and safety of the tunnel after water leakage damage treatment are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of tunnel lining structures, in particular to an existing tunnel lining leakage drainage structure. Background Art

[0002] The tunnel construction method mostly adopts the mining method, where the initial concrete is sprayed on site after blasting, and the secondary lining is built, and the main structure of the tunnel is formed by concrete. However, due to the construction process and on-site management, it is very easy to cause local voids in the main structure of the tunnel. Moreover, after years of operation, the surrounding rock and soil, groundwater, external loads and ground stress will cause the voids to develop into local leakage, cracking and fissures. Especially for plain concrete lining, such diseases seriously threaten the driving safety in the tunnel.

[0003] At present, most of the tunnel lining crack leakage treatment adopts grouting behind the lining, adding sleeve lining in the tunnel, lining excavation and burying drainage pipes to solve such problems. Grouting behind the tunnel lining, if the cavity behind the lining is large and there are multiple cavities, it is difficult to control the scope of grouting, and the plugging effect is very poor. Adding sleeve lining in the tunnel requires formwork, steel bar tying, and concrete pouring, which is time-consuming and labor-intensive, and seriously affects traffic. Lining excavation and burying drainage pipes can only solve the leakage problem of a single point, and it is difficult to fundamentally solve the leakage in the tunnel. A tunnel lining seepage reinforcement drainage structure is disclosed in a Chinese patent (publication number: CN218816522U), in which water leaking from the seepage crack can enter the inner lining pipe through the filter screen, and the water entering the inner lining pipe can be discharged into the drainage layer by the water inlet pipe, and then discharged into the drainage trough by the water outlet pipe, and finally discharged from the tunnel by the drainage trough. Although a reinforcement layer is set, the protection capacity of the reinforcement layer is difficult to meet the requirements of tunnel stability. Utility Model Content

[0004] The utility model aims to provide a drainage structure for water seepage in an existing tunnel lining in view of the defects in the prior art. In an area with serious water seepage, a secondary lining is chiseled out to form a stepped groove. The first groove accommodates a water diversion pipe to collect the leaking water. A steel mesh is laid in the second groove. The steel mesh is connected to anchor rods implanted in the surrounding rock to form a reinforcement structure, thereby ensuring the strength of the tunnel after the secondary lining is chiseled out, and ensuring the stability and safety of the tunnel after the water seepage disease is treated.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] An existing tunnel lining leakage drainage structure, comprising:

[0007] The stepped trench is formed by chiseling away the secondary lining, and includes a first trench close to the surrounding rock and a second trench facing the tunnel. The water diversion pipe is buried in the first trench. The position where the first trench connects to the second trench is the opening of the first trench. The longitudinal width of the second trench is greater than the longitudinal width of the first trench. The opening of the first trench is blocked by a waterproof board. The water diversion pipe is distributed along the circumference of the tunnel.

[0008] The reinforcement structure includes anchor rods and steel mesh. The steel mesh is arranged in the second groove. One end of the anchor rod is connected to the steel mesh, and the other end passes through the secondary lining and is implanted in the surrounding rock. The second groove is filled with a concrete layer covering the steel mesh.

[0009] Furthermore, a leveling groove is provided at the opening position of the first groove, and cement mortar is filled in the leveling groove to form a leveling layer, and the leveling layer separates the waterproof board and the second groove.

[0010] Furthermore, the leveling groove covers the opening area of ​​the first groove, and the side of the leveling layer facing the second groove is flush with the bottom surface of the second groove.

[0011] Furthermore, the steel mesh includes circumferential steel bars distributed along the circumferential direction of the tunnel and longitudinal steel bars distributed along the longitudinal direction of the tunnel. The longitudinal steel bars and circumferential steel bars are cross-distributed and then tied to form the steel mesh.

[0012] Furthermore, the longitudinal steel bars and the annular steel bars are provided in plurality, the plurality of longitudinal steel bars are distributed in annular direction of the tunnel at intervals, and the plurality of annular steel bars are distributed in the longitudinal direction of the tunnel at intervals.

[0013] Furthermore, the steel mesh is embedded in the second groove, and the steel mesh and the waterproof board are spaced apart.

[0014] Furthermore, the concrete layer includes a primary spraying layer and a post-spraying layer, and the steel mesh is located between the primary spraying layer and the post-spraying layer.

[0015] Furthermore, the primary spraying layer covers the bottom surface of the second groove, and the post-spraying layer is flush with the side of the tunnel secondary lining facing the tunnel.

[0016] Furthermore, the water diversion pipe is provided with a water diversion hole, which connects the inner and outer spaces of the water diversion pipe. The water diversion pipe is distributed along the tunnel in an annular direction, and both ends extend to drainage grooves at the bottom of the tunnel respectively.

[0017] Furthermore, the anchor rod is a steel flower tube.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model aims to solve the problem of poor stability of existing tunnels after the water leakage of tunnel linings is treated. In areas with serious water leakage, the secondary lining is chiseled out to form a stepped groove, the first groove accommodates a water diversion pipe to collect the leaking water, the second groove is laid with a steel mesh, and the steel mesh is connected to anchor rods implanted in the surrounding rock to form a reinforcement structure, thereby ensuring the strength of the tunnel after the secondary lining is chiseled out, and ensuring the stability and safety of the tunnel after the water leakage is treated.

[0020] In the utility model, a leveling layer is used to isolate the waterproof board and the steel mesh, so as to avoid failure of the waterproof board caused by collision during the installation of the steel mesh, thereby ensuring the water-proof performance of the waterproof board.

[0021] The utility model provides a combined structure of anchor rods and steel meshes to form an integral structure, which supports the concrete layer wrapping the steel meshes and can also support the leveling layer, waterproof board and water pipe on the outside thereof, thereby improving the placement stability of the drainage structure buried inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the existing tunnel lining leakage drainage structure in the embodiment of the utility model.

[0023] Figure 2 It is a distribution diagram of the steel mesh, the leveling layer and the water pipe in the embodiment of the utility model.

[0024] Explanation of numbers (in order of first appearance): 1. Anchor rod, 2. Longitudinal reinforcement, 3. Concrete layer, 4. Circumferential reinforcement, 5. Water pipe, 6. Secondary lining, 7. Leveling layer, 8. Waterproof board. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0026] At present, when treating water leakage caused by cracks in tunnel lining, the method of digging and burying drainage pipes in the lining has established a path for collecting and discharging the leakage water, but the digging area also affects the strength of the lining, resulting in poor stability of the lining and a large potential safety hazard. Based on this, this embodiment provides a drainage structure for water leakage in an existing tunnel lining, which forms a stepped groove by digging out the secondary lining 6, collects the leakage water by using the water diversion pipe 5, and enhances the stability and safety of the tunnel structure by reinforcing the structure. It not only effectively solves the water leakage problem, but also significantly improves the bearing capacity and durability of the tunnel structure, ensuring the safe operation of the tunnel.

[0027] See also Figure 1The existing tunnel lining leakage drainage structure mainly includes a stepped groove and a reinforcement structure. The stepped groove is opened in the secondary lining 6 and is formed by chiseling out the secondary lining 6. The reinforcement structure includes an anchor rod 1 and a steel mesh. The steel mesh and the water diversion pipe 5 are respectively arranged in the stepped groove. The anchor rod 1 passes through the secondary lining 6 and is driven into the surrounding rock. The steel mesh is fixed to the end of the anchor rod 1. After the waterproof board 8 is installed, concrete is sprayed to cover the steel mesh to form a concrete layer 3.

[0028] like Figure 2 As shown, the stepped groove includes a first groove close to the surrounding rock and a second groove facing the tunnel. The first groove and the second groove are a superimposed structure. After the second groove with a relatively larger size is chiseled out, the first groove is chiseled out in the second groove. The water diversion pipe 5 is buried in the first groove. The water diversion pipe 5 can be installed by setting connecting parts such as anchors. The position where the first groove connects to the second groove is the opening of the first groove. The longitudinal width of the second groove is greater than the longitudinal width of the first groove, so that the first groove is distributed within the range of the second groove. The opening of the first groove is blocked by a waterproof board 8.

[0029] The water diversion pipe 5 is distributed along the annular direction of the tunnel. A water diversion hole is provided on the water diversion pipe 5. The water diversion hole connects the inner and outer spaces of the water diversion pipe 5. The water diversion pipe 5 is distributed along the annular direction of the tunnel. Both ends of the water diversion pipe 5 extend to the drainage ditch at the bottom of the tunnel respectively. The leaked water enters the water diversion pipe 5 through the water diversion hole, and then is led out to the drainage ditch at the bottom of the tunnel through the water diversion pipe 5 for discharge, thereby solving the leakage problem.

[0030] like Figure 1 As shown, the reinforcement structure includes an anchor rod 1 and a steel mesh. The steel mesh is arranged in the second groove. One end of the anchor rod 1 is connected to the steel mesh, and the other end passes through the secondary lining 6 and is implanted in the surrounding rock. The second groove is filled with a concrete layer 3 to cover the steel mesh, and the entire step groove is sealed and leveled.

[0031] Among them, by chiseling away the secondary lining 6, two slots of different sizes are formed, namely the first slot close to the surrounding rock and the second slot facing the tunnel. The first slot is used to accommodate the water diversion pipe 5 to collect the leakage water; the second slot is used to lay the steel mesh to provide a reinforcement structure for the tunnel. The design of the stepped slot effectively collects and guides the leakage water out, and at the same time enhances the safety of the tunnel structure through the reinforcement structure.

[0032] In this embodiment, the first groove may be a groove body with a trapezoidal cross section, and the second groove may be a groove body with a rectangular cross section. In other optional embodiments, the first groove may be a groove body with a triangular cross section, and the second groove may be a groove body with a trapezoidal cross section.

[0033] The water diversion pipe 5 is buried in the first groove and distributed along the tunnel circumference, and can collect and guide the leakage water flowing in from the first groove, thereby achieving effective collection and discharge of the leakage water and avoiding water accumulation in the tunnel.

[0034] The steel mesh is tightly connected to the surrounding rock through the anchor rod 1 to form a stable reinforcement system, which enhances the strength and stability of the tunnel structure. The reinforcement structure significantly improves the bearing capacity and anti-seepage capacity of the tunnel structure, ensuring the stability and safety of the tunnel after the water leakage disease is treated.

[0035] The waterproof board 8 is used to block the opening of the first groove to prevent external water or other liquids from entering the first groove, thereby ensuring the normal operation of the water diversion pipe 5. The waterproof board 8 effectively prevents the intrusion of external water and protects the integrity of the water diversion pipe 5 and the tunnel structure.

[0036] The concrete layer 3 is filled in the second groove, covering the steel mesh to protect the steel mesh, and at the same time, it and the steel mesh jointly play the role of reinforcing the tunnel structure. The presence of the concrete layer 3 further enhances the strength and durability of the tunnel structure.

[0037] A leveling groove is provided at the opening of the first groove, and cement mortar is filled in the leveling groove to form a leveling layer 7. The leveling groove and the leveling layer 7 are designed to ensure the flatness and sealing between the waterproof board 8 and the second groove, and prevent leakage water from bypassing the waterproof board 8 and entering the second groove. The leveling layer 7 effectively isolates the waterproof board 8 and the second groove, avoids leakage problems caused by unevenness or gaps, and enhances the sealing of the tunnel drainage structure.

[0038] like Figure 1 and Figure 2 As shown, the steel mesh is composed of annular steel bars 4 distributed along the annular direction of the tunnel and longitudinal steel bars 2 distributed along the longitudinal direction of the tunnel, which are cross-distributed and tied together. There are multiple longitudinal steel bars 2 and annular steel bars 4, respectively. The multiple longitudinal steel bars 2 are distributed at intervals along the annular direction of the tunnel, and the multiple annular steel bars 4 are distributed at intervals along the longitudinal direction of the tunnel.

[0039] The annular steel bars 4 and the longitudinal steel bars 2 together form a stable and high-strength reinforcement mesh, providing an all-round reinforcement effect. The structure of the steel mesh enhances its ability to withstand stress and transmit force, improving the overall stability and bearing capacity of the tunnel structure.

[0040] The steel mesh is embedded in the second groove and spaced apart from the waterproof board 8. The waterproof board 8 is used to prevent water from entering the second groove, while the steel mesh provides structural reinforcement. The spacing between the two ensures the independence of their respective functions. The waterproof board 8 and the steel mesh do not interfere with each other, ensuring that the waterproof effect and reinforcement effect of the drainage structure are optimized at the same time.

[0041] The concrete layer 3 is divided into the primary spraying layer and the post-spraying layer, with the steel mesh located in between. The primary spraying layer first covers the bottom surface of the second trough to provide support and protection for the steel mesh; the post-spraying layer further reinforces the entire structure and ensures that it is flush with the tunnel secondary lining. The layered spraying of the concrete layer 3 improves construction efficiency while ensuring the flatness and strength of the tunnel structure.

[0042] The anchor rod 1 is made of a steel tube. As a common material for the anchor rod 1, the steel tube has good bearing capacity and durability and is suitable for the reinforcement of the tunnel structure. The steel tube anchor rod 1 ensures the stability and reliability of the reinforcement structure and improves the overall safety of the tunnel structure.

[0043] The leveling groove and leveling layer 7 improve the waterproof effect, the detailed structural design of the steel mesh ensures the comprehensiveness of the structural reinforcement, the layered injection of the concrete layer 3 improves the construction efficiency and structural strength, the setting of the water diversion pipe 5 ensures the effective collection and discharge of the leakage water, and the use of the steel flower pipe anchor rod 1 enhances the stability and reliability of the reinforced structure. Overall, the stability and safety of the tunnel structure are improved together, ensuring the long-term stable operation of the tunnel after the leakage disease is treated.

[0044] In this embodiment, the anchor rod 1 is grouted after being implanted in the surrounding rock, and the grouting pressure is controlled within 0.5 MPa. The grouting sequence is applied from bottom to top, and the upper grouting is performed after the lower layer of grout solidifies and reaches a certain strength.

[0045] According to the design requirements, the concrete in the leakage area within the scope of the secondary lining 6 is chiseled out, the water pipe 5 is buried, and a 1.5mm thick galvanized iron sheet is installed as a waterproof board 8. The water pipe 5 is leveled and sealed with 1cm double-fast cement mortar to form a leveling layer 7. The initial concrete layer 3 is sprayed to a certain thickness, and then the longitudinal steel bars 2 and the circumferential steel bars 4 are hung as required to form a steel mesh, and the concrete layer 3 is sprayed again to the designed thickness. After the concrete strength is reached, the ground is cleaned and traffic can be opened.

[0046] The existing tunnel lining leakage drainage structure provided in this embodiment can comprehensively solve the problem of cracking and leakage of existing tunnel lining. The reinforcement structure system formed by the anchor rod 1 and the steel mesh can effectively enhance the overall stability and bearing capacity of the lining, preventing further cracking and damage; the drainage system formed by the step groove and the water diversion pipe 5 can timely remove the accumulated water in the tunnel and reduce the occurrence of leakage problems; the reinforcement system can improve the overall strength and sealing of the lining and extend the service life of the tunnel.

[0047] The comprehensive use of anchoring, drainage and reinforcement techniques can effectively treat the cracking and water leakage of existing railway tunnel linings, improve the safety and reliability of tunnels, and extend their service life. At the same time, the construction is simple and the cost is moderate, which is suitable for the maintenance and renovation of various railway tunnels.

[0048] The above detailed description of the specific implementation of the utility model is only used as an example, and the utility model is not limited to the specific implementation described above. For those skilled in the art, any equivalent modification or substitution of the utility model is also within the scope of the utility model. Therefore, the equalization, modification, improvement, etc. made without departing from the spirit and principle of the utility model should be included in the scope of the utility model.

Claims

1. An existing tunnel lining leakage drainage structure, characterized in that: include: The stepped trench is formed by chiseling away the secondary lining, and includes a first trench close to the surrounding rock and a second trench facing the tunnel. The water diversion pipe is buried in the first trench. The position where the first trench connects to the second trench is the opening of the first trench. The longitudinal width of the second trench is greater than the longitudinal width of the first trench. The opening of the first trench is blocked by a waterproof board. The water diversion pipe is distributed along the circumference of the tunnel. The reinforcement structure includes anchor rods and steel mesh. The steel mesh is arranged in the second groove. One end of the anchor rod is connected to the steel mesh, and the other end passes through the secondary lining and is implanted in the surrounding rock. The second groove is filled with a concrete layer covering the steel mesh.

2. The existing tunnel lining leakage drainage structure according to claim 1, characterized in that: A leveling groove is provided at the opening position of the first groove, and cement mortar is filled in the leveling groove to form a leveling layer, and the leveling layer separates the waterproof board and the second groove.

3. The existing tunnel lining leakage drainage structure according to claim 2, characterized in that: The leveling groove covers the opening area of ​​the first groove, and the side of the leveling layer facing the second groove is flush with the bottom surface of the second groove.

4. The existing tunnel lining leakage drainage structure according to claim 1, characterized in that: The steel mesh comprises circumferential steel bars distributed along the circumferential direction of the tunnel and longitudinal steel bars distributed along the longitudinal direction of the tunnel. The longitudinal steel bars and the circumferential steel bars are cross-distributed and then tied to form the steel mesh.

5. The existing tunnel lining leakage drainage structure according to claim 4, characterized in that: There are a plurality of longitudinal steel bars and annular steel bars respectively, the plurality of longitudinal steel bars are distributed at intervals along the annular direction of the tunnel, and the plurality of annular steel bars are distributed at intervals along the longitudinal direction of the tunnel.

6. The existing tunnel lining leakage drainage structure according to claim 4 or 5, characterized in that: The steel mesh is embedded in the second groove, and the steel mesh and the waterproof board are spaced apart.

7. The existing tunnel lining leakage drainage structure according to claim 1, characterized in that: The concrete layer comprises a primary spraying layer and a post-spraying layer, and the steel mesh is located between the primary spraying layer and the post-spraying layer.

8. The existing tunnel lining leakage drainage structure according to claim 7, characterized in that: The primary spraying layer covers the bottom surface of the second groove, and the post-spraying layer is flush with the side of the tunnel secondary lining facing the tunnel.

9. The existing tunnel lining leakage drainage structure according to claim 1, characterized in that: The water diversion pipe is provided with a water diversion hole, which connects the inner and outer spaces of the water diversion pipe. The water diversion pipe is distributed along the tunnel annularly, and both ends extend to the drainage grooves at the bottom of the tunnel respectively.

10. The existing tunnel lining leakage drainage structure according to claim 1 or 9, characterized in that: The anchor rod is a steel flower tube.

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