Method for treating tunnel collapse using pavilion-type bracket

Abstract

The invention provides a method for treating the tunnel collapse using a pavilion-type bracket, and relates to the technical field of tunnels and underground engineering. The method for treating the tunnel collapse using the pavilion-type bracket is suitable for the case where a collapse cavity is relatively stable and the collapse cavity has the relatively high height and is not prone to contacting the roof. The method for treating the tunnel collapse using the pavilion-type bracket comprises the steps that a collapsed body is leveled, and the pavilion-type bracket is moved to the lower partof the collapse cavity, a hydraulic prop is used for jacking a shield plate to the lower edge of the shield plate beyond the outer contour line of a tunnel primary support arch, a bottom column is connected to the lower part of a stand column, and a base plate is inserted. If the hydraulic prop retracts, the stand column, the bottom column, the base plate and the hydraulic prop jointly bear the load transmitted by the shield plate. The primary support arch is installed and connected under the protection of the shield plate, the intersection of the stand column and the adjacent primary supportarch is welded, and the stand column in the primary support arch is cut off. After the single hydraulic prop is withdrawn, the load of the shield plate is smoothly transferred from the pavilion-type bracket to an initial support scaffold, and the quick-setting concrete is sprayed to a grid arch to form a closed shell, and a filling material is pumped to fill the space of the collapse cavity. Thismethod has the advantages of low requirements for the jacking height of the hydraulic prop, safe construction and the like.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a method for dealing with tunnel collapse by using pavilion-type supports. Background technique [0002] At present, the common methods for dealing with tunnel collapse accidents mainly include pipe shed method, backfill method, arching method, small conduit grouting method, secondary lining reinforcement method, etc. Among them, the pipe shed method is to drill holes parallel to the tunnel axis along the excavation contour line, and then insert steel pipes of different diameters to form a steel pipe shed. The backfilling method is a treatment method of drilling grouting or backfilling filling materials from the ground surface or in the tunnel above the collapsed cavity. The small conduit grouting method is to drive a small conduit with grouting holes in front of the tunnel face at a certain elevation angle along the outer contour of the tunnel before...

AI Technical Summary

Problems solved by technology

This method is suitable for the situation where the collapse cavity is relatively stable, the height of the collapse cavity is large, and the hydraulic prop is difficult to connect to the top, and it solves the problem that the stability of the shield support has high requirements on the strength and stiffness of the hydraulic prop, and the problem of cylinder explosion that may be caused by the sudden collapse of the collapse position ; There is also the technical problem of the smooth transfer of the shield load to the initial support scaffolding

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