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Weak surrounding rock tunnel excavation construction technology

A technology of tunnel excavation and construction technology, which is applied in tunnels, earth movers/excavators, mining equipment, etc. It can solve the problems of over- and under-excavation in blasting construction that are difficult to control, unfavorable tunnel construction environment, and affect the stability of rock mass, etc. problems, to achieve the effect of saving large-scale equipment investment, reducing construction costs, and reducing resource input

Inactive Publication Date: 2017-05-31
CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the drill and blast method is that it disturbs the surrounding rock greatly, and often causes disasters because the blasting affects the stability of the rock mass; in addition, it is difficult to control the over- and under-excavation of the blasting construction, which not only affects the construction period but also causes economic waste; gas, which is not conducive to the improvement of the tunnel construction environment
Mechanical excavation is ideal for extremely soft rock mass, fast and safe, but when the strength of the rock mass exceeds its allowable range, the construction efficiency is low. The main factors affecting the mechanical efficiency are the length of the bucket teeth and the bucket teeth. Two aspects with the area of ​​the rock face
In addition, when excavating the vault with a bucket, it will cause damage to the initial support that has been supported.

Method used

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Embodiment Construction

[0037] The tunnel excavation technology in weak surrounding rock shall be carried out according to the following steps:

[0038] 1. Construction preparation:

[0039] Observe the surrounding rock conditions of the tunnel face to determine which side to excavate first;

[0040] 2. Measurement and setting out:

[0041] Release the contour line points on the steel frame close to the tunnel face in the last cycle, and disclose the overrun situation of each point;

[0042] 3. Install the left (right) side blade:

[0043] The blade slots are welded on both sides of the excavator bucket, and steel plates are used as blades to be inserted into the slots to replace the original bucket teeth. During construction, single-side blades are used for excavation. According to the hardness and softness of the rock mass on the left and right sides of the working face, dig out the softer side of the surrounding rock first, and install the side blade, so as to quickly create conditions for the ...

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Abstract

The invention relates to a weak surrounding rock tunnel excavation construction technology which is mainly used for solving the problems that in existing tunnel excavation, large disturbance is generated to surrounding rock, and destruction is caused to primary support. The technology is implemented according to the following steps that contour line point positions are released on a steel frame close to a tunnel face; insertion grooves are welded to the two sides of an excavator bucket, steel plates are inserted into the insertion grooves by serving as blades, the soft side of the surrounding rock is excavated firstly, the blade on the soft side of the surrounding rock is installed, the tunnel face is excavated with the blade, the blade on the other side is installed, and the side of the tunnel face is excavated; when a loading machine loads waste on the tunnel face, excavation operation is conducted on the other side of the tunnel face through the blade; when excavation of the two sides is completed, the middle of the tunnel face is excavated, and an excavator conducts excavation operation on the left side or right side of the middle of the tunnel face; the top contour line is trimmed through the bucket, and a left footing and a right footing are trimmed through bucket teeth of the excavator; primary support is conducted, and closed looping is conducted on the surrounding rock; next-cycle excavation construction is conducted. The technology has the advantages that small disturbance is generated to the surrounding rock, and the primary support cannot be destructed.

Description

[0001] Technical field: [0002] The invention relates to a tunnel excavation construction technology, in particular to a tunnel excavation construction technology in weak surrounding rock. [0003] Background technique: [0004] Tunnel excavation methods are generally divided into three types: drill and blast excavation, mechanical excavation, and manual excavation. Excavation. The soft rock between drilling and blasting and mechanical excavation is usually excavated by drilling and blasting. The disadvantage of the drill and blast method is that it disturbs the surrounding rock greatly, and often causes disasters because the blasting affects the stability of the rock mass; in addition, it is difficult to control the over- and under-excavation of the blasting construction, which not only affects the construction period but also causes economic waste; gas, which is not conducive to the improvement of the tunnel construction environment. Mechanical excavation is ideal for ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/10E21D9/04E02F5/18E02F9/28
CPCE21D9/10E02F5/18E02F9/2883E21D9/04
Inventor 周纪卫张兴春张继平李金永周卫霞伞志丰
Owner CHINA RAILWAY 19TH BUREAU GRP 1ST ENG
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