Tunnel diversion system suitable for water-rich stratum and construction method

Abstract

The invention discloses a tunnel diversion system suitable for a water-rich stratum and a construction method. The tunnel diversion system comprises an annular channel steel structure which is arranged between two truss I-shaped steel of a primary support and corresponds to the outline of a tunnel. Water outlets in the two ends of the annular channel steel structure communicate with the center drainage ditch through the side wall water collecting wells and the transverse buried grooves in sequence. In the tunnel excavation process, it is found that strand-shaped water flows out of the surrounding rock surface or the primary support surface, a water outlet and drainage groove can be formed between two truss I-shaped steel in front of and behind a concentrated water outlet point, and an annular channel steel structure is arranged in the drainage groove for water drainage. According to the method, construction is simple, pre-judgment expanding excavation is not needed, universality is high, the annular channel steel structure is buried in the gap between the two truss I-shaped steel for drainage, the annular drainage capacity of the tunnel and the reliability of the drainage structure are greatly improved, the drainage requirement of the water-rich stratum tunnel can be effectively met, and practicability is high.

Description

Technical field [0001] The present invention relates to a tunnel throughput system and construction method suitable for the rich floors, which are in the field of tunnel construction, especially for tunnel drainage structures in surrounding rockfishing paragraphs. Background technique [0002] The tunnel construction is often encountered in the rock rich section. If the treatment of groundwater during construction is not in place, it may have adverse effects on the tunnel support structure, which will leave a hidden danger for tunnel operation safety. For the case of the tunnel crossing the rich segment of the rock, relatively reliable practice is to direct the groundwater around the tunnel to reduce the water pressure acting on the tunnel structure, and reduce the risk of tunnel leakage in the later operational stage. However, it is limited to the pipe diameter of the drain pipe, the routine tunnel anti-drainage system is limited, and it is not sufficient to cope with the large ...

AI Technical Summary

Problems solved by technology

However, limited by the diameter of the drainage pipe, the drainage capacity of the conventional tunnel waterproof and drainage system is limited, which is not enough to deal with the situation of large strands of water

At the same time, the radial stiffness of the circumferential drainage pipes installed between the primary support and the secondary lining is extremely limited, and there is a possibility of extrusion deformation or even rupture during the construction of the secondary lining, which seriously affects the smoothness of the tunnel drainage system

[0003] It can be seen that the existing tunnel waterproof and drainage system that uses drainage pipes to divert and drain groundwater has certain limitations in function, and it is not enough to deal with the water-rich section of the surrounding rock with concentrated strands of water. Once the groundwater cannot be diverted and drained in time, There are certain construction risks and operational risks

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