Shallow underground excavation tunnel excavation supporting system and construction method

Abstract

The invention provides a shallow underground excavation tunnel excavation supporting system and a construction method, and relates to the technical field of tunnel engineering. A long pipe shed and asmall guide pipe are adopted for pre-grouting to reinforce an advance support, the long pipe shed and the small guide pipe are arranged for grouting support, so that the reinforcing effect is good, and the grouting quality is easy to control; by arranging a pipe shed orifice guide device with the adjustable inclination and a guide pipe inclination adjusting device which are fixedly installed on asteel arch frame, the inclination and the installation position of the pipe shed and the guide pipe can be accurately controlled, the construction is fat, and the effect is remarkable; and by adoptingwater injection bag grout leaking for temporary plugging and installing a tunnel vault large-size water spraying cavity supporting system, relaxation deformation of surrounding rock can be effectively prevented, the integrity of the vault surrounding rock is improved, and a good blocking and discharging effect on pore water is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to an excavation support system and a construction method for a shallow buried tunnel. Background technique [0002] With the rapid development of urban construction in our country, due to the expansion of cities and the relief of urban traffic pressure. In recent years, the construction of urban tunnels has been increasing. Due to the restrictions on land use and most of them are located in prosperous areas and close to dense buildings or residential areas, there are more and more complex geological tunnels, and the safety of tunnel construction has become more and more important. social concern. The construction of tunnels passing through broken zones, loose zones, and weak strata is difficult, with high construction risks and poor safety. To pass through such unfavorable geological areas safely and quickly, and effectively control the subsidence of the ground surface...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an excavation and support system and construction method for shallow buried tunnels, aiming at solving the problem of slow excavation and support construction speed, poor support effect, and installation speed of pipe sheds and small conduits for shallow buried tunnels at the present stage. The technical problems of slow and poor accuracy, poor sealing effect and poor integrity of the surrounding rock of the cavity

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