Anti-seepage lining structure of karst tunnel

Abstract

The utility model provides a karst tunnel anti-seepage lining structure which is characterized in that a tunnel outer lining is arranged on the outer side of a tunnel inner lining, a drainage pipe communicated with an underground river is arranged at the bottom of a side wall on the underground river side of the tunnel outer lining, and the end, located in a tunnel, of the drainage pipe is connected with a gate valve when the tunnel outer lining is lined. When lining is conducted on the lining tunnel, the end, located in the tunnel, of the drainage pipe is connected with a sealing plate, and a water passing culvert pipe communicated with an underground river is transversely arranged below the tunnel in a penetrating mode. According to the structure, the tunnel structure can be prevented from being damaged by underground external water, and meanwhile construction safety and construction quality are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy engineering technology, specifically relating to a seepage-proof lining structure for karst tunnels. Background Technology

[0002] Many existing water conservancy projects have small-flow water conveyance lines, and tunnel water conveyance accounts for a large proportion of these structures. When tunnel water conveyance has a small flow, horseshoe or archway shapes are often used for construction to facilitate construction and save investment. In this case, the cross-section itself has limited capacity to withstand external water. To ensure tunnel safety, local adjustment of the cross-section is usually adopted, or external water is blocked by the outer lining. At the same time, drainage holes are drilled in the tunnel to relieve pressure. However, the above-mentioned local adjustment of the cross-section is more difficult to construct for underground rivers. At the same time, the cross-section enlargement or adjustment has high requirements for the water quality at the connection points and the hydraulic conditions are more complex, making it difficult to control the operation in the later stage. Considering the case of direct tunnel lining and outer lining, if the external water is large, the cross-section is also difficult to control. In addition, the above overall methods are more difficult to construct for small-section tunnels, and the corresponding investment increases significantly. Summary of the Invention

[0003] This utility model provides a seepage-proof lining structure for karst tunnels, which can prevent groundwater from damaging the tunnel structure, while ensuring construction safety and quality. The specific solution is as follows:

[0004] A seepage-proof lining structure for a karst tunnel includes an inner tunnel lining and an outer tunnel lining. The bottom of the sidewall of the outer tunnel lining on the side of an underground river is provided with a drainage pipe connected to the underground river. When the outer tunnel lining is being constructed, the end of the drainage pipe located inside the tunnel is connected to a gate valve, and when the inner tunnel lining is being constructed, the end of the drainage pipe located inside the tunnel is connected to a sealing plate. A culvert connected to the underground river is transversely arranged under the tunnel.

[0005] Furthermore, the tunnel lining cross-section is circular or gate-shaped.

[0006] Furthermore, the drainage pipe located inside the tunnel is connected to a gate valve or a sealing plate via a flange.

[0007] Furthermore, the inner end of the drainage pipe is located inside the tunnel lining.

[0008] Furthermore, the drainage pipe is a steel pipe structure.

[0009] The beneficial effects of this utility model are:

[0010] This utility model discloses a seepage-proof lining structure for karst tunnels. This structure ensures the integrity of the groundwater channel, especially in karst landforms where the surface and groundwater are closely connected. It indirectly ensures that the surface and groundwater circulation is not disrupted. For the project, the external lining minimizes external water pressure, ensuring the internal lining channel and preventing damage to the lining caused by sudden increases in external water pressure due to unknown groundwater conditions within the karst cavity. This guarantees construction safety and quality. The reduced external water pressure on the internal lining also ensures consistent water flow across the front and rear sections. For the entire project and the ecology, it satisfies the requirements of project safety, economy, and ecological preservation, and facilitates later operation and management. Attached Figure Description

[0011] Figure 1 This is a circular cross-sectional view of the lining structure of this utility model.

[0012] Figure 2 This is a cross-sectional view of the gate-shaped lining structure of this utility model.

[0013] Explanation of reference numerals in the attached diagram: 1. Underground river; 2. Water culvert; 3. External lining of the tunnel; 4. Drainage pipe; 5. Gate valve; 6. Internal lining of the tunnel. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] See Figure 1-2 A karst tunnel seepage-proof lining structure includes an inner tunnel lining 6, an outer tunnel lining 3 on the outside of the inner tunnel lining 6, and a drainage pipe 4 connected to the underground river 1 at the bottom of the sidewall of the outer tunnel lining 3. The inner end of the drainage pipe 4 extends inward. When the outer tunnel lining 3 is being lined, the end of the drainage pipe 4 located inside the tunnel is connected to a gate valve 5. When the inner tunnel lining 6 is being lined, the end of the drainage pipe 4 located inside the tunnel is connected to a sealing plate. A culvert 2 connected to the underground river 1 is transversely arranged under the tunnel.

[0016] The preferred tunnel lining has a circular or archway-shaped cross section.

[0017] The preferred drainage pipe 4 located inside the tunnel is connected to the gate valve 5 or the sealing plate via a flange.

[0018] The inner end of the preferred drainage pipe 4 is located inside the tunnel lining 6.

[0019] The preferred drainage pipe 4 is a steel pipe structure.

[0020] During construction, to avoid damage to the lining caused by a sudden increase in external water due to unknown groundwater conditions within the karst cavity, appropriate drainage pipes and gate valves are installed at the bottom of the tunnel lining sidewalls. This ensures that the water pressure can be released in coordination with the underground drainage structure of the karst cavity during construction, and that the water pressure is low during the construction of the tunnel lining structure, facilitating tunnel construction. The drainage pipes can be installed with gate valves to control the opening. After the lining is poured and reaches a certain strength, the drainage pipes are sealed with sealing plates. To ensure the stability of the overall structure, the original tunnel lining section can be poured after the sealing plates have been closed for a period of time.

[0021] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0022] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A seepage-proof lining structure for karst tunnels, characterized in that: The tunnel includes an inner lining (6), an outer lining (3) is provided on the outside of the inner lining (6), and a drainage pipe (4) connected to the underground river (1) is provided at the bottom of the sidewall of the outer lining (3) on the side of the underground river (1). When the outer lining (3) is being constructed, the end of the drainage pipe (4) located inside the tunnel is connected to a gate valve (5). When the inner lining (6) is being constructed, the end of the drainage pipe (4) located inside the tunnel is connected to a sealing plate. A culvert (2) connected to the underground river (1) is provided across the tunnel.

2. The karst tunnel seepage-proof lining structure according to claim 1, characterized in that: The tunnel lining (6) has a circular or archway-shaped cross section.

3. The karst tunnel seepage-proof lining structure according to claim 1, characterized in that: The end of the drainage pipe (4) located inside the tunnel is connected to the gate valve (5) or the sealing plate via a flange.

4. The karst tunnel seepage-proof lining structure according to claim 1, characterized in that: The inner end of the drainage pipe (4) is located inside the tunnel lining (6).

5. The seepage-proof lining structure for karst tunnels according to claim 1, characterized in that: The drainage pipe (4) is a steel pipe structure.

Images