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A large-section soft rock tunnel excavation construction method

A construction method and large-section technology, applied in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of inability to timely support the surrounding rock of the section, poor rock stability, difficult rock excavation, etc., and achieve significant economic benefits. The effect of reducing equipment wear and tight process connection

Active Publication Date: 2019-04-09
核工业井巷建设集团有限公司
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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

Method used

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  • A large-section soft rock tunnel excavation construction method
  • A large-section soft rock tunnel excavation construction method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the embodiments in the accompanying drawings.

[0026] Such as figure 1 with figure 2 As shown, the tunnel excavation construction method includes the following steps:

[0027] Step 1: The tunnel is a soft rock tunnel with Class IV and V surrounding rocks. At the beginning of excavation, install a circular laser pointer on the wall of the tunnel that has completed the initial lining 20 meters away from the excavation face, and project it on the tunnel section. Laser reference point 3 provides a reference point for the excavation of the working face. The laser pointing device is arranged around the primary lining hole wall behind the tunnel face, and projects multiple laser reference points 3 along the direction of the section outline 4 .

[0028] Step 2: A U-shaped lower pilot tunnel 1 is excavated by a cantilever roadheader in the lower rock formation of the tunnel section. For example, when...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
CPCE21D9/00
Inventor 王兴洲李森林于士兴刘祖盛张杰张立兵郭旭阳
Owner 核工业井巷建设集团有限公司
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