Shallow-buried biased segment tunnel stratum reinforcement construction method

Abstract

The invention belongs to the technical field of tunnel engineering construction, and provides a shallow-buried biased segment tunnel stratum reinforcement construction method aiming at solving the problems of potential construction safety danger and the like when a tunnel passes through a high-steep V-shaped gully biased segment with a shallow covering layer. The reinforcement structures comprise a ground line, net sprayed concrete, a reinforced concrete cover plate, a crown beam, slide-resistant piles, steel flora pipes and the tunnel. The whole reinforcement segment is reinforced by the steel flora pipes through grouting; a steel pipe needs to go deep into a tunnel bottom plate for more than 500mm; nets are hung at the ground surface, and concrete is sprayed for construction; the tunnel biased side mainly uses the slide-resistant piles; the slide-resistant piles need to go deep into the tunnel bottom for 5m; in addition, the crown beam is cast on the top of the slide-resistant piles; in addition, the reinforced concrete cover plate with the thickness being 500mm is arranged right above the tunnel and at the slide-resistant pile side; steel bars at a concrete cover plate and net spray concrete connecting part need to be welded together. The construction method effectively solves the problem of shallow-buried biased segment tunnel stratum reinforcement difficulty, and has the advantages that the work procedures are simple; safety and reliable are realized; the water and soil loss is prevented, and the like.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to a construction method for reinforcing the stratum of a shallow-buried bias-voltage section tunnel. Background technique [0002] At present, with the development of my country's national economy, the intensity of construction continues to increase, and a large number of tunnel projects have emerged. Tunnel construction inevitably encounters high and steep V-shaped gullies passing through shallow overburden layers, which simultaneously leads to the formation of shallow buried bias tunnels. Generally speaking, mountain gullies are eroded by rainwater all year round, and the geological environment is generally poor. The surrounding rock of the tunnel has low strength, poor self-stability, loose and broken rock mass, and is accompanied by a certain degree of surface water seepage. At the same time, Due to the uneven stress distribution of the rock...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the tunnel passes through the bias section of the high and steep V-shaped gully with a shallow covering layer, due to the complex stress state of the surrounding rock, there are hidden dangers in construction safety, etc., and further provides a kind of ground reinforcement for the tunnel in the shallow buried bias section Construction method

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