A kind of construction method for entering a hole through a shallow heavy-load highway

Abstract

The invention discloses a tunnel entry construction method for crossing a shallow high-load highway, and relates to the technical field of tunnel construction. The tunnel entry construction method for crossing a shallow high-load highway includes: pouring a concrete wall on the outer side of the tunnel, so as to carry out the tunnel construction. Preliminary maintenance; drill holes at preset positions below the arching line of the tunnel vault and the straight wall section of the tunnel to obtain installation holes; press at least two pipe sheds in sequence into any installation hole, and place adjacent ones. The two pipe sheds are welded; the grouting conduit is installed in the pipe shed, and the consolidation grouting is carried out in the grouting conduit; the surrounding rock is broken into the tunnel, and the initial support is carried out after the slag is discharged outside the tunnel; Lining the formwork and lining the reinforced concrete, and repeating the steps of entering the tunnel for crushing the surrounding rock. The above-mentioned tunnel-entry construction method solves the technical problem of tunnel crossing a shallow high-load mine highway construction, ensures the safety of tunnel construction, saves investment and improves economic benefits.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a tunnel entry construction method for crossing a shallow high-load highway. Background technique [0002] At present, in view of the situation that the tunnel exit section is all weathered rock, it is often difficult to construct the shallow section of the tunnel. [0003] In actual construction, it is often encountered that the weathered joints and fissures in the tunnel exit section are relatively developed, the rock mass is broken and has a scattered structure, and the tunnel is located below the road. According to the actual measurement, the top of the tunnel is about 6.18m away from the hillside road, the width of the road is 6m, the thickness of the road concrete is 0.2m, and the tunnel exit is located in the filling area for many years. There are heavy vehicles passing over the mine road at any time. The full load of the vehicle is 80 tons. When the vehicle i...

AI Technical Summary

Problems solved by technology

[0004] In view of the fact that the geological conditions of this section are extremely poor and it is difficult to form a hole, the current hole-forming methods such as mechanical cutting, drilling and blasting, mechanical slag removal, and tunnel support cannot meet the actual needs. , there is a dynamic load on it, and under the condition of heavy load, excavation by blasting and other forms will greatly disturb the ground, which will cause the tunnel to collapse and affect the safety of construction personnel and equipment

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