Soft and weak wall rock tunnel advance reinforced support construction method

Abstract

The invention discloses a soft and weak wall rock tunnel advance reinforced support construction method. When a pipe roof advance support construction is carried out on one segment of the constructed tunnel, the construction method comprises the following steps: (1) support arch and guide pipe construction, wherein a plurality of guide tubes for carrying out guiding on a plurality of pipe roof pipes are arranged on a support arch; each pipe roof pipe comprises a pipe body and a drill bit; each pipe body is formed by splicing a plurality of pipe joints; each drill bit is coaxially arranged at the front end of the pipe body; the pipe joints are spiral steel pipes; the pipe roof pipes are first pipe roof pipes or second pipe roof pipes; and the first pipe roof pipes and the second pipe roof pipes are staggered; (2) drilling machine and slip casting machine installation and emplacement; (3) pipe roof advance support construction, which comprises the following processes: first pipe roof pipe drilling and synchronous grouting construction, final hole grouting construction of the first pipe roof pipes, second pipe roof pipe drilling and synchronous grouting construction and final hole grouting construction of the second pipe roof pipes. The method disclosed by the invention is simple in steps, reasonable in design, simple and convenient to construct and good in support effect; and the soft and weak wall rock tunnel advance reinforced support process can be simply, conveniently and quickly finished.

Description

technical field [0001] The invention belongs to the technical field of tunnel advance support construction, and in particular relates to a construction method for advance reinforcement support of tunnels with weak surrounding rocks. Background technique [0002] The advance support of the pipe shed is to drive a group of steel pipes (i.e. pipe shed pipes) into the ground along the outer side of the excavation contour of the tunnel, and combine them with the steel arch to form a powerful pre-support reinforcement system for the shed. , to support the load from the surrounding rock on the upper part of the pipe shed, and pressurize the grout into the formation through the grouting hole to strengthen the weak and broken formation and improve the self-stabilization ability of the formation. [0003] During tunnel construction, the surrounding rocks with a grade below IV are weak surrounding rocks. For example, during the construction of the Dadushan Tunnel in the Shanghai-Kunmi...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a construction method for advance strengthening support of weak surrounding rock tunnels in view of the deficiencies in the above-mentioned prior art. The method has simple steps, reasonable design, simple construction, good support effect, simple and Quickly complete the advanced support process of tunnels with weak surrounding rocks, which can solve the problems of complex procedures, long construction period, high construction difficulty and poor advanced support effect existing in the existing tunnel pipe shed advanced support construction method

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