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Soft rock tunnel cantilever type heading machine excavation construction method

A cantilever roadheader and construction method technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problem of less rock formations, achieve the effects of reducing disturbance, avoiding damage, and improving construction efficiency

Active Publication Date: 2020-06-09
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This construction method can increase the excavation speed of large-section soft rock tunnels, and the process connection is compact, saving time and reducing equipment wear, but it has little contribution to reducing disturbance to rock formations

Method used

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  • Soft rock tunnel cantilever type heading machine excavation construction method

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Embodiment

[0035] A method for excavating a soft rock tunnel with a cantilever type roadheader, comprising the following steps:

[0036] Step 1: The cantilever roadheader, the second transport machine, the laser pointing device and the ventilator equipment enter the site, clean the surface of the site, and initially position the laser pointing device;

[0037] Step 2: Calculate the position of the laser center line according to the tunnel excavation design line, and install the laser pointing device according to the position of the laser center line;

[0038] Step 3: Laser pointing measurement and positioning: After the laser pointing device is installed and fixed firmly, use the measuring instrument to measure the position and direction of the laser center line of the laser pointing device;

[0039] Step 4: Carry out the positioning and commissioning of the cantilever roadheader and the second transporter;

[0040] Step 5: Excavation for the first time: Use the cutting head of the cant...

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Abstract

The invention provides a soft rock tunnel cantilever type heading machine excavation construction method. The soft rock tunnel cantilever type heading machine excavation construction method comprisesthe steps that firstly, a cantilever type heading machine, a second conveyor, a laser orientation instrument and ventilator equipment enter the field; secondly, the laser orientation instrument is installed; thirdly, laser orientation measurement and positioning are conducted; fourthly, in-place and debugging operation of the cantilever type heading machine and the second conveyor is conducted; fifthly, first-time excavation is conducted; sixthly, subsequent excavation is conducted; and seventhly, steel ruler measurement and excavation face finishing are conducted. According to the construction method, the cantilever type heading machine is adopted for conducting tunnel excavation construction, disturbance to surrounding rock is effectively reduced, damage to the surrounding rock is avoided, and safety and quality are guaranteed.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation construction, in particular to a cantilever-type roadheader excavation construction method for soft rock tunnels. Background technique [0002] In the construction process of water conservancy and hydropower projects, a large number of diversion tunnels are involved. At present, most of them are constructed by drilling and blasting in China. In soft rock tunnels, weak weathering is intermingled with strong weathering, the rock mass is broken, affected by the geological structure, joints and fissures are developed, there are many open mud, there are weak interlayers and bedding dislocation zones, there are a large number of empty cutting bodies, and the groundwater activity is moderate to high. Strong, accelerate rock mass weathering and reduce the shear strength of structural plane, the angle between hole line and structural plane is greater than 30°, and the inclination angle of rock fo...

Claims

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Application Information

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IPC IPC(8): E21D9/10E21D11/18E21F5/04E21F16/02G01C15/00
CPCE21D9/10E21D9/003E21D11/18E21F5/04E21F16/02G01C15/004
Inventor 朱晓轲王伟奇薛占云王凯张勇
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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