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A method for excavating tunnels in flysch strata

A technology of tunnel excavation and construction method, which is applied in the direction of tunnel, tunnel lining, earthwork drilling, etc. Ensure construction quality and improve excavation efficiency

Active Publication Date: 2019-10-18
CCCC TUNNEL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When excavating a tunnel in flysch stratum, due to the special lithology of flysch, the effect of smooth blasting will be greatly reduced. Excavation requirements, and additional construction costs, reduce engineering safety and quality
The conventional cantilever excavation method used in flysch is also prone to over-excavation due to poor guiding effect and rock characteristics.

Method used

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  • A method for excavating tunnels in flysch strata
  • A method for excavating tunnels in flysch strata
  • A method for excavating tunnels in flysch strata

Examples

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Embodiment 1

[0077] Such as figure 1 , figure 2 , a method for excavating a tunnel in a flysch stratum, wherein a cantilever roadheader 10 is used to excavate a tunnel in a flysch stratum 20 . The cantilever boring machine is powered by the cable 11. During construction, a loader 12 is used to load the cut earth and stone into a dump truck 13 to be transported out of the construction site.

[0078] The tunnel design excavation profile 22 in this embodiment has a radius of r=5m.

[0079] Such as image 3 , Figure 4 , Figure 5 During the construction process, a laser transmitter 30 is used to emit a group of laser beams 31, and the laser beams irradiate the laser spot 32 on the face 21 to mark the tunnel design excavation outline 22 in real time.

[0080] The laser point is on the inner side of the inner wall of the shotcrete 40 of the tunnel, and the distance between the laser point and the inner wall of the shotcrete tunnel is S=10cm; the thickness of the shotcrete in this embodim...

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Abstract

The invention relates to a tunnel excavation construction method in a flysch stratum. A tunnel is excavated in the flysch stratum by adopting a cantilever tunneling machine; a laser beam is adopted toshine on a tunnel face so as to identify the design excavation contour of the tunnel in real time; an initial hole is excavated first, and then fine excavation of the tunnel design contour line is conducted; and a protecting steel frame is erected on the inner side of a reserved reinforcement net of a previous supporting cycle. The tunnel excavation construction method has the beneficial effectsthat laser guiding is adopted to avoid back break caused by blind excavation; the excavated contour quality and excavation efficiency can be improved through the method and order of cutting rock by the cantilever tunneling machine, and collapse caused by oxidation of the flysch stratum can be effectively avoided; a protecting measure is adopted for the reserved reinforcement net of the previous cycle, and the construction quality can be effectively guaranteed; and the construction efficiency of tunnel excavation of the flysch stratum can be improved, and the construction cost is saved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a tunnel excavation construction method in flysch stratum. Background technique [0002] At present, the mainstream tunnel construction methods include drill and blast method and shield method. The shield method is mainly used in subway and municipal tunnels. The construction of medium and large section tunnels in highways and railways is mainly based on the drill and blast method. The commonly used advanced drill and blast technology is smooth blasting. Highway and high-speed railway tunnels have high requirements for over- and under-excavation by blasting excavation, "Technical Guidelines for High-speed Railway Tunnel Engineering Construction" Tie Jian Jian (2010) No. 1 and "Technical Specifications for Highway Tunnel Construction" (JTG-F60-2009) Zhongjun clearly stipulates that “under-excavation should be strictly controlled. Under-excavation is strictl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/10E21D11/15E21D11/18
Inventor 严少发周蔚冯海军罗良乾张琪李建宝张广义许晓东王海平车广州林海张庆祎朱刚雷
Owner CCCC TUNNEL ENG