The Construction Method of Advance Small Conduit Entry and Exit Hole in Rock Tunnel

An advanced technology of small conduits and access holes, which is applied in tunnels, tunnel linings, shaft equipment, etc., can solve the problems of difficulty in meeting the construction principles of the new Austrian method, large disturbance of the surrounding rock at the entrance of the tunnel, and long construction period, so as to improve construction efficiency, The effect of reducing investment and reducing disturbance

Inactive Publication Date: 2020-06-09
CHINA RAILWAY SIXTH GRP CO LTD +1
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  • Claims
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AI Technical Summary

Problems solved by technology

The traditional guide wall and long pipe shed advanced support measures to enter and exit the hole not only greatly disturb the surrounding rock of the hole, but it is difficult to meet the construction principle of the new Austrian method, and the construction period is long and the construction cost is high

Method used

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  • The Construction Method of Advance Small Conduit Entry and Exit Hole in Rock Tunnel
  • The Construction Method of Advance Small Conduit Entry and Exit Hole in Rock Tunnel
  • The Construction Method of Advance Small Conduit Entry and Exit Hole in Rock Tunnel

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Embodiment Construction

[0025] The construction method of the advanced small conduit entry and exit hole of the rock tunnel includes the following steps:

[0026] (1) Use the total station to accurately set out the drilling hole position on the tunnel excavation contour line and mark it with red paint:

[0027] (2) Use the YT28 drilling rig to drill holes. The drilling direction should be straight. The drilling depth and diameter should match the leading small conduit. The sand in the hole is blown out;

[0028] (3) Pass the small lead pipe through the steel frame, hammer it or push it in through the drilling rig, the jacking length is not less than 90% of the length of the small lead pipe, and the outer insertion angle of the small lead pipe is 5-10°. Condition adjustment, but not > 10°, the circumferential distance is 40cm, and the sand and gravel in the leading small duct are blown out with high-pressure air, and the exposed part of the leading small duct should be firmly welded to the steel fram...

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Abstract

The invention relates to a tunnel departure and reception construction method, in particular to a construction method for departure and reception of an advanced small conduit in a rock tunnel. The construction method comprises the steps of driving and tunneling the small conduit into a stable rock stratum in the front along a tunnel excavation contour line before the tunnel is excavated, and welding the tail end of the small conduit onto a steel arch frame, and carrying out grouting on the small conduit, wherein a slurry penetrates into rock cracks via holes of the small conduit, the cement slurry solidifies the fractured rock mass, and the small conduit plays a certain supporting effect on the rock mass, thereby effectively restraining the surrounding rock from collapsing after excavation. The construction method has the advantages of conforming to the construction principle of a new Austrian tunneling method, fully protecting the rock mass, reducing disturbance to the rock mass, avoiding excessive damage to the strength of the rock mass, giving full play to the self-stabilizing capability of the surrounding rock, improving the construction efficiency, accelerating construction progress, decreasing investment in construction machinery, and saving construction costs.

Description

technical field [0001] The invention relates to a construction method for tunnel entry and exit holes, in particular to a construction method for the entry and exit holes of small conduits in advance of rock tunnels. Background technique [0002] With the construction and development of railways, the proportion of tunnels in construction is increasing. How to enter and exit the tunnel safely and effectively is the primary link in tunnel construction, and it is also an important part of whether tunnel construction can proceed smoothly. The traditional guide wall and long pipe shed advanced support measures to enter and exit the hole not only greatly disturb the surrounding rock of the hole, which is difficult to meet the construction principle of the new Austrian method, but also the construction period is long and the construction cost is high. Contents of the invention [0003] In order to solve the above-mentioned problems, the present invention provides a construction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 刘俊宏李金龙宗书合韩翔吕双年王彬荆夏平张超王忠华白龙张伟耿岩君秦金德李升
Owner CHINA RAILWAY SIXTH GRP CO LTD
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