A kind of excavation construction method of large cross-section soft rock tunnel

Abstract

The invention provides a large-section soft rock tunnel excavation construction method which comprises the following steps that a laser reference point is projected to the section of a tunnel, a lowerpilot tunnel is excavated in the lower portion of the section of the tunnel, and muck is transferred out of the lower pilot tunnel; a side wall of the lower pilot tunnel is trimmed according to the laser reference point as a reference point; an upper pilot tunnel is excavated in the section of the tunnel from bottom to top; and after excavation of the upper pilot tunnel is completed, the laser reference point serves as a reference point, and the section contour line of the upper pilot tunnel is trimmed. By means of the construction method, the excavation speed of the large-section soft rock tunnel can be increased, procedure connection is compact, time is saved, equipment abrasion can be reduced, the construction quality is high, surrounding rock disturbance is small, safety and reliability are achieved, and the economic benefit effect is remarkable.

Description

Technical field[0001]The technical field of tunnel excavation of the present invention particularly relates to a construction method for excavating large-section soft rock tunnels.Background technique[0002]With the advancement of science and technology, the construction technology and construction machinery and equipment that can be selected for tunnel excavation construction continue to innovate. However, under different construction conditions, how to match the best construction technology and equipment is not only of great significance to improving construction efficiency and shortening the construction period, but also of increasing economic benefits for enterprises. For the excavation of soft rock tunnels, conventional drilling and blasting construction has outstanding problems such as poor construction quality, low efficiency, and high cost. Especially in some overseas mudstone tunnel engineering projects, it will be difficult to approve explosives, high construction costs, an...

AI Technical Summary

Problems solved by technology

However, for the excavation construction of large-section mudstone tunnels, due to outstanding problems such as large tunnel diameters and poor rock stability, conventional mechanical equipment has many deficiencies.

For example, when a roadheader matching the size of the section is used for excavation, the entire working face will be blocked by the roadheader, and the surrounding rock of the section cannot be supported in time after excavation, which increases the risk of construction safety; if a small roadheader is used for excavation , there will be the embarrassing situation that the height of the roadheader is not enough, and the rock stratum above the section is difficult to excavate; in addition, the use of excavators or milling machines for excavation will also face some problems such as unguaranteed construction quality and low construction efficiency. Various issues that are conducive to construction progress

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