Tunnel-entering construction method for crossing shallow-layer large-load road

Abstract

The invention discloses a tunnel-entering construction method for crossing a shallow-layer large-load road, and relates to the technical field of tunnel construction. The tunnel-entering constructionmethod for crossing the shallow-layer large-load road comprises the following steps: a concrete wall is poured on the outer side of a tunnel for preliminary maintenance of the tunnel; holes are drilled in the arch crown of the tunnel and the preset position, away from an arching line, of the straight wall section of the tunnel, and mounting holes are obtained; at least two pipe sheds are pressed into any mounting hole in sequence, and every two adjacent pipe sheds are welded; grouting guide pipes are installed in the pipe sheds, and consolidation grouting is conducted in the grouting guide pipes; tunnel entering is conducted to crush surrounding rock, and primary support is conducted after slag is discharged out of the tunnel; and a lining formwork is installed in the tunnel and reinforcedconcrete lining is conducted, and the step of entering the tunnel to crush the surrounding rock is repeatedly executed. According to the tunnel-entering construction method, the technical problem that the tunnel passes through a shallow large-load mine road is solved, the tunnel construction safety is ensured, meanwhile, the investment is saved, and the economic benefit is improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a tunnel entry construction method for crossing shallow heavy-load highways. Background technique [0002] At present, in view of the situation that the exit section of the tunnel is fully weathered rock, it is often more 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 exit section of the tunnel are relatively developed, the rock mass is broken and has a loose structure, and the tunnel is located under the highway. According to the actual measurement, the distance between the top of the cave and the hillside road is about 6.18m, the width of the road is 6m, and the thickness of the road concrete is 0.2m. There are heavy vehicles passing above the mine road at any time. The full load of the vehicle is 80 tons. When the vehicle is wrong, two vehicles totalin...

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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