A large-section soft rock tunnel excavation construction method

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, in particular relates to a large-section soft rock tunnel excavation construction method. Background technique [0002] With the advancement of science and technology, the construction techniques and construction machinery and equipment that can be selected for tunnel excavation construction are constantly innovating. However, under different construction conditions, how to match the optimal construction technology and equipment is of great significance not only to improve construction efficiency and shorten the construction period, but also to increase the economic benefits of 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. For issues such as safety, only mechanical excavation construction methods can be used at this time. [0003] Commonly ...

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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