A drainage system for a cut-and-cover tunnel

Abstract

The utility model relates to tunnel drainage technical field, especially a kind of open cut tunnel drainage system, including open cut tunnel main body, open cut tunnel main body both sides are equipped with backfill layer, backfill layer upper side is paved with filter layer, and open cut tunnel main body bottom is equipped with drain pipe;It further includes the first blind pipe being arranged in filter layer, and the first blind pipe is along filter layer length direction setting;It further includes the second blind pipe being arranged in backfill layer, and the second blind pipe is along backfill layer height direction setting.Through the first blind pipe to quickly collect the surface water in filter layer, reduce surface water percolation to backfill layer, simultaneously, utilize the second blind pipe to collect the deep water in backfill layer, it is convenient for deep water in backfill layer to discharge in time, avoid because waterlogging too much to lead to backfill layer soil body softening, and, second blind pipe one end is connected with second blind pipe, and second blind pipe other end is used to be connected with drain pipe, to drain using the drain pipe of tunnel, avoid to add new drainage passage in backfill layer.

Description

Technical Field

[0001] This utility model relates to the field of tunnel drainage technology, and in particular to a drainage system for open tunnels. Background Technology

[0002] A tunnel opening is a tunnel constructed using the cut-and-cover method, with the lining structure built and the exterior backfilled with soil and rocks. Tunnel openings are mainly used for tunnel entrances that are susceptible to collapse, rockfall, or debris flow and mudflow. They are a common structure used in the design and construction of highway, railway, and municipal mountain tunnels.

[0003] Currently, after backfilling soil and rocks to cover the surface of the tunnel opening, rainwater and surface water tend to accumulate above the backfill layer on both sides of the opening. If they cannot be drained in time, they can easily seep into the backfill layer, causing the soil to soften and affecting the stability of the tunnel side structure. Utility Model Content

[0004] The purpose of this utility model is to provide a drainage system for open tunnels, which addresses the problem that rainwater and surface water tend to accumulate above the backfill layers on both sides of the tunnel in the background art. If the water cannot be drained in time, it can easily seep into the backfill layer, causing the soil to soften and affecting the stability of the tunnel side structure.

[0005] In a first aspect, the present invention provides a drainage system for a tunnel, comprising a tunnel body, backfill layers on both sides of the tunnel body, a filter layer laid on top of the backfill layers, and a drainage pipe located below the bottom of the tunnel body; It also includes a first blind tube disposed within the filter layer, the first blind tube being disposed along the length direction of the filter layer; It also includes a second blind pipe disposed within the backfill layer. The second blind pipe is disposed along the height direction of the backfill layer, and one end of the second blind pipe is connected to the drainage pipe, while the other end of the second blind pipe is used to connect to the drainage pipe.

[0006] Preferably, it also includes a third blind pipe disposed at the bottom of both sides of the main body of the tunnel, the third blind pipe being arranged along the length of the main body of the tunnel, and the third blind pipe being used to connect with the drainage pipe.

[0007] Preferably, it also includes a fourth blind pipe laid at the bottom of the main tunnel, the fourth blind pipe being used to connect the second blind pipe and the drainage pipe.

[0008] Preferably, the main body of the tunnel includes a lining body, a leveling layer is provided on the outside of the lining body, a waterproof layer is provided on the outside of the leveling layer, and a protective layer is provided on the outside of the waterproof layer.

[0009] Preferably, it also includes a water ditch disposed at the bottom of the main body of the tunnel, the water ditch being connected to the main body of the tunnel, and the drain pipe being located inside the water ditch.

[0010] Preferably, the bottom of the ditch is provided with a concrete layer, and the bottom of the drain pipe is embedded in the concrete layer; A layer of crushed stone is filled on top of the concrete layer, and the crushed stone layer covers the drainage pipe.

[0011] Preferably, the upper part of the drain pipe is provided with a drain pipe, which is located within the gravel layer.

[0012] Preferably, the portion of the drainage pipe located in the gravel layer is wrapped with geotextile.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses a tunnel drainage system where a filter layer is laid above the backfill layer, and a first blind pipe is installed inside the filter layer along its length. A second blind pipe is installed inside the backfill layer along its height. The first blind pipe in the filter layer quickly collects surface water, reducing its infiltration into the backfill layer. Simultaneously, the second blind pipe collects deep water within the backfill layer, facilitating its timely drainage and preventing softening of the backfill soil due to excessive water accumulation. One end of the second blind pipe is connected to another pipe, while the other end connects to a drainage pipe, utilizing the tunnel's existing drainage system. This avoids the need to add new drainage channels within the backfill layer. This tunnel drainage system, through the first and second blind pipes and the drainage pipe, forms a drainage path, effectively draining water from the outside of the tunnel and improving its structural safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the drainage system for the Myeongdong tunnel in this application.

[0015] Figure 2 This is a schematic diagram of the water ditch structure.

[0016] Figure 3 This is a schematic diagram of the upper structure of Myeongdong.

[0017] Figure 4 yes Figure 3 Sectional view at point AA.

[0018] Figure 5 This is a schematic diagram of the lower structure of Myeongdong.

[0019] Figure 6 This is a schematic diagram of the blind pipe connection in the tunnel.

[0020] Marked in the image: 1-Myeongdong main body, 11-Main lining, 12-Leveling layer, 13-Waterproof layer, 14-Protective layer 2-Backfill layer, 3-Reverse filter layer, 4-Drain pipe, 5-First blind pipe, 6-Second blind tube, 7-Third blind tube, 8-Fourth blind tube, 9-Ditch, 10- Concrete layer, 20-Gravel layer, 30-Drain pipe, 40-Geotextile, 50 - Water pipe. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0022] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are set as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," "parallel," or "coaxial" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0024] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0025] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0026] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0027] Example 1 like Figures 1-4 As shown, this embodiment discloses a tunnel drainage system, including a tunnel body 1, backfill layers 2 on both sides of the tunnel body 1, a filter layer 3 laid on top of the backfill layers 2, and a drainage pipe 4 located below the bottom of the tunnel body 1. It also includes a first blind tube 5 disposed within the filter layer 3, the first blind tube 5 being disposed along the length direction of the filter layer 3; It also includes a second blind pipe 6 installed in the backfill layer 2. The second blind pipe 6 is installed along the height direction of the backfill layer 2, and one end of the second blind pipe 6 is connected to the other end of the drainage pipe 4.

[0028] The drainage system for the open-cut tunnel implemented in this embodiment uses a first blind pipe 5 within the filter layer 3 to quickly collect surface water, reducing the infiltration of surface water into the backfill layer 2. Simultaneously, a second blind pipe 6 within the backfill layer 2 collects deep water, facilitating timely drainage and preventing softening of the soil in the backfill layer 2 due to excessive water accumulation. Furthermore, one end of the second blind pipe 6 is connected to another pipe, and the other end is connected to a drainage pipe 4, thus utilizing the tunnel's existing drainage pipe 4 for drainage. This avoids the need to construct new drainage channels within the backfill layer 2. The drainage system for the open-cut tunnel of this application, through the first blind pipe 5, the second blind pipe 6, and the drainage pipe 4, forms a drainage path, effectively draining water from the outside of the open-cut tunnel and improving its structural safety.

[0029] In this embodiment, the filter layer 3 is a mixture of sand and pebbles, which is laid on top of the backfill layer 2; Backfill layer 2 is formed by graded crushed stone backfill.

[0030] In optional implementations, such as Figure 5 , Figure 6 As shown, it also includes a third blind pipe 7 installed at the bottom of both sides of the main body 1 of the tunnel. The third blind pipe 7 is laid out along the length of the main body 1 of the tunnel and is used to connect with the drainage pipe 4.

[0031] The third blind pipe 7 is used to collect the water accumulated at the bottom of both sides of the main body 1 of the cave, so as to prevent the water from soaking the bottom of the main body 1 of the cave for a long time, protect the foundation of the main body 1 of the cave, and enhance the stability of the bottom of the main body 1 of the cave.

[0032] Furthermore, such as Figure 6 As shown, it also includes a water inlet pipe 50, which is used to connect the third blind pipe 7 and the drain pipe 4.

[0033] Specifically, the water inlet pipe 50 is a PVC pipe, one end of which is connected to the third blind pipe 7, and the other end of which is connected to the drain pipe 4.

[0034] In optional implementations, such as Figure 1 , Figure 5 As shown, it also includes a fourth blind pipe 8 laid at the bottom of the main body 1 of the tunnel, which is used to connect the second blind pipe 6 and the drainage pipe 4.

[0035] The fourth blind pipe 8 serves as a transition pipe to connect the second blind pipe 6 and the drain pipe 4, so that the second blind pipe 6 can discharge the accumulated water into the drain pipe 4.

[0036] In optional implementations, such as Figure 3 As shown, the main body 1 of the tunnel includes a lining body 11, a leveling layer 12 is provided on the outside of the lining body 11, a waterproof layer 13 is provided on the outside of the leveling layer 12, and a protective layer 14 is provided on the outside of the waterproof layer 13.

[0037] The leveling layer 12 on the outside of the lining body 11 can fill the honeycomb and pitted surface of the lining body 11, forming a flat base, ensuring that the waterproof layer 13 is tightly attached to the lining body 11, and avoiding water seepage channels caused by poor adhesion. Furthermore, the protective layer 14 on the outside of the waterproof layer 13 protects the waterproof layer 13, prevents sharp stones from scratching the waterproof layer 12, and extends the service life of the waterproof layer 12.

[0038] In this implementation, the leveling layer 12 is a 2cm thick cement mortar layer; Waterproof layer 13 consists of a waterproof membrane and geotextile; The protective layer 14 is a 5cm thick cement mortar layer.

[0039] Furthermore, a coating layer is provided between the leveling layer 12 and the waterproof layer 13. The coating layer is formed by applying polyurethane waterproof coating onto the leveling layer 12.

[0040] In optional implementations, such as Figure 2 As shown, it also includes a ditch 9 located at the bottom of the main body 1 of the tunnel. The ditch 9 is connected to the main body 1 of the tunnel, and the drain pipe 4 is located inside the ditch 9.

[0041] The drainage ditch 9 forms a protective barrier for the drainage pipe 4, preventing damage to the drainage pipe 4 due to settlement.

[0042] In optional implementations, such as Figure 2 As shown, the bottom of the ditch 9 is provided with a concrete layer 10, and the bottom of the drain pipe 4 is embedded in the concrete layer 10. A layer of crushed stone 20 is filled on top of the concrete layer 10, and the crushed stone layer 20 covers the drainage pipe 4.

[0043] The concrete layer 30 at the bottom of the ditch 9 can form a rigid base. The bottom of the drain pipe 4 is embedded in the concrete layer 10. The concrete layer 30 effectively supports the drain pipe 4, preventing the drain pipe 4 from shifting or tilting, and ensuring the stable operation of the drain pipe 4. Furthermore, a gravel layer 20 is filled on top of the concrete layer 10, and the gravel layer 20 covers the drainage pipe 4. The gravel layer 20 has good permeability and can quickly drain the water in the ditch 9, thus preventing excessive water accumulation in the ditch 9.

[0044] Furthermore, a drain pipe 30 is provided on the upper part of the drain pipe 4, and the drain pipe 30 is located inside the gravel layer 20.

[0045] When the water volume in drain pipe 4 is too large, some of the water flow will be discharged through drain pipe 30 to prevent damage to drain pipe 4 due to excessive water volume.

[0046] In an optional embodiment, the portion of the drainage pipe 4 located in the gravel layer 20 is wrapped with geotextile 40.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for draining a cut-and-cover tunnel, the system comprising: The structure includes a main tunnel (1), with backfill layers (2) on both sides of the main tunnel (1), a filter layer (3) laid on top of the backfill layers (2), and a drainage pipe (4) at the bottom of the main tunnel (1). It also includes a first blind tube (5) disposed within the filter layer (3), the first blind tube (5) being disposed along the length direction of the filter layer (3); It also includes a second blind pipe (6) disposed in the backfill layer (2), the second blind pipe (6) is disposed along the height direction of the backfill layer (2), and one end of the second blind pipe (6) is connected to the second blind pipe (6), and the other end of the second blind pipe (6) is used to connect to the drain pipe (4).

2. The drainage system for a tunnel according to claim 1, characterized in that, It also includes a third blind pipe (7) installed at the bottom of both sides of the main body of the tunnel (1). The third blind pipe (7) is laid out along the length of the main body of the tunnel (1) and is used to connect with the drainage pipe (4).

3. A drainage system for a tunnel according to claim 1, characterized in that, It also includes a fourth blind pipe (8) laid at the bottom of the main body of the tunnel (1), which is used to connect the second blind pipe (6) and the drainage pipe (4).

4. A drainage system for a tunnel according to claim 1, characterized in that, The main body of the tunnel (1) includes a lining body (11), a leveling layer (12) is provided on the outside of the lining body (11), a waterproof layer (13) is provided on the outside of the leveling layer (12), and a protective layer (14) is provided on the outside of the waterproof layer (13).

5. A drainage system for a tunnel according to claim 1, characterized in that, It also includes a ditch (9) set at the bottom of the main body of the tunnel (1), the ditch (9) being connected to the main body of the tunnel (1), and the drain pipe (4) being located inside the ditch (9).

6. A drainage system for a tunnel according to claim 5, characterized in that, The bottom of the ditch (9) is provided with a concrete layer (10), and the bottom of the drain pipe (4) is embedded in the concrete layer (10); The concrete layer (10) is filled with a crushed stone layer (20), which covers the drainage pipe (4).

7. A drainage system for a tunnel according to claim 6, characterized in that, The upper part of the drain pipe (4) is provided with a drain pipe (30), which is located inside the gravel layer (20).

8. A drainage system for a tunnel according to claim 6, characterized in that, The portion of the drainage pipe (4) located in the gravel layer (20) is wrapped with geotextile (40).

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