Extremely-weak surrounding rock tunnel full-face boundary lead pipe shed

Abstract

The invention discloses an extremely-weak surrounding rock tunnel full-face boundary lead pipe shed. The extremely-weak surrounding rock tunnel full-face boundary lead pipe shed comprises a pipe shedbody and a base layer. The pipe shed body is built on the outer side of the base layer, shed pipes are inserted into the pipe shed body, reinforcing guide pipes are transversely inserted into the positions, on the inner wall of the base layer, of the inner side of the pipe shed body, couplings are arranged at the positions, on the front surface of the pipe shed body, of the shed pipes in a connected manner, and insurance arms are rotationally arranged at the two ends of the couplings. The reinforcing guide pipes are transversely inserted into the inner side of a shed frame, the reinforcing guide pipes are driven into the position between the two shed pipes, the reinforcing guide pipes can be driven step by step in the excavating process after the shed frame is built, meanwhile, mud is injected, the self-stability capacity of the shed frame is improved, and collapse is avoided; and the couplings are arranged at the outer ends of the shed pipes of the shed frame, after the shed pipes aredriven, the couplings can be taken out and arranged at the outer ends of the shed pipes, the situation that as the shed pipes on the inner sides are stressed to move, the adjacent shed pipes are tangent or crossed is avoided, the stability of the supporting face is improved, and the overall structural strength of the pipe shed is improved.

Description

Technical field [0001] The invention belongs to the technical field of pipe sheds, and in particular relates to a full-section boundary leading pipe shed of extremely soft surrounding rock tunnels. Background technique [0002] It is mainly used in weak and broken surrounding rock tunnel projects that have strict requirements on surrounding rock deformation and surface subsidence, such as weak, gravel stratum and soft rock, rock piles, and fractured zone sections, which are generally part of or along the section of underground engineering. All of them are arranged circumferentially at a certain interval to form a steel pipe shed. The pipe shed advance support is for safe excavation under special conditions. The temporary support method to enhance the bearing capacity of the ground is provided in advance. The beam arch effect: the first construction of the pipe The shed takes the surrounding rock support in front of the tunnel and the surrounding rock support at the back as the fu...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a full-section boundary leading pipe shed of a very weak surrounding rock tunnel, to solve the problem of the existing very weak surrounding rock tunnel full-section boundary leading pipe shed proposed in the above background technology, usually before drilling, accurate measurement The plane position, inclination, and extrapolation angle of the holes, and each hole is numbered. The determination of the drilling elevation angle should depend on the drilling depth and the strength of the drill pipe. The scaffolding must ensure the stability of the weak and broken surrounding rock tunnel engineering. , to avoid subsidence at the tunnel and reduce the risk of construction

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