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Construction method of circular pilot pit for small-distance intersecting tunnel

A construction method and a technology with a small net distance, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as increased difficulty in support construction, high pressure on construction safety, and increased engineering costs, achieving significant protection and ensuring Improvement of construction safety and stability

Active Publication Date: 2017-03-08
CHINA RAILWAY NO 9 GRP +1
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AI Technical Summary

Problems solved by technology

When the approach distance of the three-level intersection tunnel is less than or equal to 4.24m, the construction safety pressure is extremely high, and the support construction becomes more difficult, the engineering cost increases, and even safety accidents are caused.

Method used

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  • Construction method of circular pilot pit for small-distance intersecting tunnel

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Embodiment Construction

[0023] The construction method of the circular pilot pit of the three-dimensional intersection tunnel with a small net distance includes the following steps:

[0024] 1) Advanced geological forecast: conduct a geological sketch of the face every 5m for the 50m cross-influenced section, record the surrounding rock conditions, and use the rock drilling rig to drill a shallow hole with a small diameter of 1m long and φ42mm in the tunnel excavation face. Get rock samples from the excavated face of the tunnel, and conduct laboratory tests on the rock samples, including rock uniaxial compressive strength, rock rebound value, rock mass elastic modulus, weak surface shear strength, initial ground stress and secondary stress field tests to obtain advanced geological information in front of the tunnel face; TRT6000 advanced geological detector is used to forecast the geological conditions within 50m of the cross-affected section before the excavation of the affected section, collect TRT ...

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Abstract

The invention relates to a small-clear-distance grade separation tunnel annular guide pit construction method. Construction is conducted through advance geology forecasting, surveying and setting out, arch advance supporting, upper annular guide pit excavating, upper annular guide pit preliminary supporting, lower middle annular guide pit excavating, lower middle annular guide pit preliminary supporting, core soil excavating, bottom and inverted arch excavating, inverted arch advance supporting, bottom and inverted arch preliminary supporting, grouting and monitoring and measuring, the force bearing capacity of tunnel surrounding rock is effectively enhanced, and it is guaranteed that grade separation does not affect safe crossing of zones.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a construction method for an annular pilot pit of a three-dimensional intersection tunnel with a small clear distance. Background technique [0002] At present, my country's high-speed railway construction is developing rapidly, and new railways extend in all directions and criss-cross. The spacing of various tunnel projects is getting closer and closer due to special geological conditions or many other factors. When the approach distance of the intersecting tunnel is less than or equal to 4.24m, the construction safety pressure is extremely high, and the support construction is more difficult, the engineering cost is increased, and even safety accidents are caused. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a construction method for the circular pilot pit of the three-dimensional intersection tunnel with small cl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/18
CPCE21D9/006E21D11/006E21D11/105E21D11/18
Inventor 许庆君赵金祥韩顺学陈海军金龙金毓红张明武丁宁隋成文唐贞锋铁大禹姚智明
Owner CHINA RAILWAY NO 9 GRP
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