Tunnel hole periphery drainage device for water-rich high-permeability stratum

Abstract

The utility model relates to the technical field of tunnel excavation, in particular to a tunnel hole periphery drainage device for a water-rich high-permeability stratum, which comprises a surrounding rock and a drainage component arranged on the inner side of the surrounding rock, the drainage component comprises a grouting group, a drainage pipe and a drainage header pipe, the grouting group comprises a plurality of grouting pipes, the grouting pipes are uniformly distributed on the inner wall of the surrounding rock, and the drainage header pipe is arranged on the inner wall of the surrounding rock. The drainage pipe is arranged on one side of the grouting set and comprises an inner pipe and an outer pipe, a plurality of holes are formed in the drainage pipe, the inner pipe is sleeved with the outer pipe, and the inner pipe and the outer pipe are communicated through the holes. According to the utility model, grouting is carried out in the grouting pipe, so that water in the surrounding rock is extruded to flow out into the drainage pipe, most of water in the surrounding rock is extruded to seep after grouting, so that the interior of the surrounding rock is kept dry to the maximum extent, and the reinforcing mesh, the reinforcing frame, the primary support and the secondary lining are sequentially arranged on the outer side of the surrounding rock, so that the surrounding rock is further blocked; and meanwhile, one end of the main drainage pipe extends out of the secondary lining, so that subsequent drainage in the surrounding rock is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of tunnel excavation technology, and in particular to a drainage device for the tunnel perimeter in water-rich and highly permeable strata. Background Technology

[0002] As a crucial component of transportation networks, tunnels face increasing risks due to their expanding geographical reach and harsher environments. The vast geological strata they traverse, coupled with complex groundwater conditions and varying groundwater exposure rates across different sections, exacerbate the risk of leakage. This is particularly true in water-rich, high-permeability areas with high groundwater levels and high permeability coefficients in the soil and rock (such as sand layers, fractured zones, and karst formations), which can lead to continuous seepage or high-pressure water inrushes. This can result in secondary lining seepage during tunnel construction, severely impacting construction quality and reducing the tunnel's lifespan. Therefore, pre-construction drainage is often necessary.

[0003] In existing technologies, after tunnel excavation, several drainage pipes are directly inserted into the surrounding rock to draw groundwater out for drainage. However, this method is prone to seepage and leakage at the intervals of the drainage pipes, and the drainage efficiency is not high. Utility Model Content

[0004] In view of the technical problems existing in the background art, the purpose of this utility model is to provide a drainage device for the tunnel perimeter in water-rich and highly permeable strata, which can enhance the drainage performance inside the tunnel, avoid water seepage and leakage, and has high drainage efficiency.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A tunnel perimeter drainage device for water-rich, high-permeability strata includes surrounding rock and a drainage assembly disposed on the inner side of the surrounding rock. The drainage assembly includes a grouting group, a drainage pipe, and a main drainage pipe. The grouting group includes a plurality of grouting holes evenly distributed on the inner wall of the surrounding rock. Drainage holes are provided on the surrounding rock and are located on one side of the grouting group. The drainage pipe is disposed within the drainage holes and includes an inner pipe and an outer pipe. The drainage pipe has a plurality of holes, and the outer pipe is sleeved outside the inner pipe, with the holes connecting the inner and outer pipes. The drainage pipe is connected to the main drainage pipe.

[0007] Preferably, the drain pipe further includes a first filter layer and a second filter layer, wherein the first filter layer is sleeved on the outer wall of the outer pipe and the second filter layer is sleeved between the inner pipe and the outer pipe.

[0008] Preferably, one end of the inner pipe extends from the outer pipe and connects to the main drain pipe.

[0009] As preferred, the drainage assembly further comprises a steel mesh, which is arranged close to the inner wall of the surrounding rock.

[0010] As preferred, the drainage assembly further comprises a steel frame, which is arranged close to the inner wall of the steel mesh.

[0011] As preferred, the drainage assembly further comprises a secondary lining, the drainage main is arranged outside the steel frame, the secondary lining is arranged outside the drainage main, and one end of the drainage main extends from the secondary lining.

[0012] The utility model has the advantages and beneficial effects that:

[0013] In the utility model, the grouting group is arranged, grouting is injected into the grouting pipe, the water in the surrounding rock is extruded to flow out into the drainage pipe, most of the water in the surrounding rock is extruded and seeps out after grouting, the interior of the surrounding rock is kept dry to the greatest extent, the steel mesh, the steel frame, the primary support and the secondary lining are arranged in sequence outside the surrounding rock, the surrounding rock is further blocked, water seepage at the surrounding rock is prevented, and one end of the drainage main extends from the secondary lining, so that subsequent drainage in the surrounding rock is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A trolley position schematic view of the tunnel hole peripheral drainage device for the water-rich high-permeability stratum is provided in the utility model.

[0015] Figure 2 A sectional view of the tunnel hole peripheral drainage device for the water-rich high-permeability stratum is provided in the utility model.

[0016] Figure 3 For Figure 2 A partial enlarged view.

[0017] Figure 4 A drainage pipe structure schematic view of the tunnel hole peripheral drainage device for the water-rich high-permeability stratum is provided in the utility model.

[0018] The figure mark: 1-surrounding rock, 101-trolley, 2-grouting hole, 21-grouting pipe, 22-drainage hole, 3-outer pipe, 31-connection hole I, 32-inner pipe, 33-connection hole II, 34-first filter layer, 35-second filter layer, 4-steel mesh, 5-steel frame, 6-primary support, 7-drainage main, 8-secondary lining, A-drainage pipe. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Example

[0022] like Figures 1-4 As shown, a tunnel perimeter drainage device for water-rich, high-permeability strata includes surrounding rock 1 and a drainage assembly installed inside the surrounding rock 1. The drainage assembly includes a grouting group, a drainage pipe A, a main drainage pipe 7, a steel mesh 4, a steel frame 5, and a secondary lining 8. The grouting group includes several grouting holes 2. During the initial excavation of the tunnel, multiple grouting holes 2 are evenly drilled on the inner wall of the surrounding rock 1, and a grouting pipe 21 is inserted into the grouting holes 2. Drainage holes 22 are provided on the surrounding rock 1, and the drainage pipe A is inserted into the drainage hole 22. The drainage pipe A is located on one side of the grouting group, and concrete is poured into the grouting pipe 21. The concrete seeps into the surrounding rock 1 to form a water-resistant layer. At the same time, the outlet of the water-resistant layer is located at the location of the drainage hole 22, allowing water inside the surrounding rock 1 to flow out from the drainage pipe A. The drainage structure allows water inside the surrounding rock 1 to flow along the direction of the drainage pipe A, preventing uneven seepage of water inside the surrounding rock 1 and enhancing the waterproof performance of the tunnel.

[0023] like Figure 1 , Figure 2 , Figure 4 As shown, drain pipe A includes an inner pipe 32, an outer pipe 3, a first filter layer 34, and a second filter layer 35. Drain pipe A has several holes. The outer pipe 3 is fitted over the inner pipe 32, and the holes connect the inner pipe 32 and the outer pipe 3. The holes include connecting hole I 31 and connecting hole II 33. Connecting hole I 31 is located on the outer pipe 3, and connecting hole II 33 is located on the inner pipe 32. The first filter layer 34 is fitted onto the outer wall of the outer pipe 3, and the second filter layer 35 is fitted between the inner pipe 32 and the outer pipe 3. The first filter layer 34 has a mesh structure. The first filter layer 34 filters the water in the surrounding rock 1, preventing sand and gravel from entering the drain pipe A and clogging it. The second filter layer 35 is made of woven fabric, which not only further filters the water in the surrounding rock 1, but also increases the friction between the outer pipe 3 and the inner pipe 32, preventing slippage between the inner pipe 32 and the outer pipe 3. After being filtered by the first filter layer 34, the water in the surrounding rock 1 enters the outer pipe 3 through the connecting hole I 31, and after being filtered by the second filter layer 35, it enters the inner pipe 32 through the connecting hole II 33 and flows out along the direction of the inner pipe 32.

[0024] like Figures 1-4As shown, the trolley 101 is used to transport the mechanical equipment during the drilling and grouting process, the drain pipe A is connected with the trolley 101 through the clamp, the drain pipe A is inserted into the drainage hole 22 during the grouting process, the water in the surrounding rock 1 is continuously extruded to the position of the drainage hole 22 along with the grouting, and flows out from the drain pipe A, the clamp between the drain pipe A and the trolley 101 is removed, and then the drain pipe A is fixed in the drainage hole 22 for subsequent drainage, the reinforcing mesh 4 is arranged on the inner wall of the surrounding rock 1, the reinforcing frame 5 is arranged on the inner wall of the reinforcing mesh 4, the concrete is poured into the reinforcing frame 5 to connect the reinforcing frame 5 and the reinforcing mesh 4 into an integrated body, so as to prevent the water in the surrounding rock 1 from flowing out, the primary support 6 is arranged on the outer side of the reinforcing frame 5 to fix the reinforcing frame 5, and one end of the drain pipe A extends out of the primary support 6, the drain main pipe 7 is arranged on the inner wall of the primary support 6, the drain main pipe 7 is arranged in a ring shape, one end of the drain pipe A is connected with the drain main pipe 7, the water in the drain pipe A flows out into the drain main pipe 7, and the secondary lining 8 is poured on the outer side of the drain main pipe 7, and one end of the drain main pipe 7 extends out of the secondary lining 8, the water in the surrounding rock 1 flows out of the drain main pipe 7, in this structure, most of the water in the surrounding rock 1 is first drained to the position of the drainage hole 22 and then discharged from the drain pipe A, and then the surrounding rock 1 is sealed by the grouting, the reinforcing mesh 4, the reinforcing frame 5, the primary support 6 and the secondary lining 8, so as to prevent the surrounding rock 1 from seeping water, and make the water in the surrounding rock 1 flow out of the drain pipe A, which can effectively prevent most of the water from seeping, timely discharge the seepage water, improve the drainage efficiency and keep the inside of the tunnel dry.

[0025] The preferred embodiments of the utility model are merely used for limiting the utility model, for those skilled in the art, the utility model can have various changes and changes, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A tunnel hole perimeter drainage device for water-rich high permeability strata, comprising a surrounding rock, a drainage assembly arranged inside the surrounding rock, characterized in that, The drainage assembly comprises a grouting group, a drainage pipe and a drainage main pipe, the grouting group comprises a plurality of grouting pipes, the grouting pipes are uniformly distributed on the inner wall of the surrounding rock, the drainage pipe is arranged on one side of the grouting group, the drainage pipe comprises an inner pipe and an outer pipe, a plurality of holes are arranged on the drainage pipe, the outer pipe is sleeved outside the inner pipe, and the holes are in communication with the inner pipe and the outer pipe, and the drainage pipe is in communication with the drainage main pipe.

2. A drainage device for a tunnel in a water-rich, highly permeable formation according to claim 1, characterized in that The drainage pipe further comprises a first filter layer and a second filter layer, the first filter layer is sleeved on the outer wall of the outer pipe, and the second filter layer is sleeved between the inner pipe and the outer pipe.

3. A drainage device for a tunnel in a water-rich, high-permeability formation according to claim 1, characterized in that One end of the inner pipe extends from the outer pipe and is connected with the drainage main pipe.

4. A drainage device for a tunnel in a water-rich, high-permeability formation according to claim 1, characterized in that, The drainage assembly further comprises a steel mesh, and the steel mesh is arranged close to the inner wall of the surrounding rock.

5. A drainage device for a tunnel in a water-rich, highly permeable formation according to claim 4, characterized in that The drainage assembly further comprises a steel mesh frame, the steel mesh frame is arranged close to the inner wall of the steel mesh, and one side of the steel mesh frame is provided with primary support.

6. A drainage device for a tunnel in a water-rich, highly permeable formation according to claim 5, characterized in that The drainage assembly further comprises secondary lining, the drainage main pipe is arranged on one side of the primary support, the secondary lining is arranged on one side of the drainage main pipe, and one end of the drainage main pipe extends from the secondary lining.

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