Tunnel dredging method suitable for railway large section IV, V class rock tunnel

A large-section and tunnel technology, which is applied to the excavation of V-level surrounding rock tunnels and the IV field of large-section railways, can solve the problems of unstable progress, low work efficiency, unstable construction operations, etc., and achieve the effect of easy operation.

Active Publication Date: 2008-01-16
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0003] The present invention solves the problem of narrow working space, low work efficiency, inflexible construction method, unstable progress, easily deformed and unstable surrounding rock and construction operation when the existin...

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  • Tunnel dredging method suitable for railway large section IV, V class rock tunnel
  • Tunnel dredging method suitable for railway large section IV, V class rock tunnel

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[0022] An excavation method suitable for railway large-section IV and V-level surrounding rock tunnels. First, according to the tunnel span and height requirements, the surrounding rock is excavated into a ladder shape with a lower step 5 and a middle step 3, and then includes the following steps: A , After the advanced support is applied, excavate the arc-shaped guide pit 2 of the arch along the excavation contour line, the height of the arc-shaped guide pit 2 is 3.0-4.0m, and immediately spray 3-5cm thick concrete to seal , and reserve the core soil in the middle as the upper step 1, and at the same time implement the initial support of the arch. It is 1.5-2.5m, and the excavation cycle footage is determined according to the distance between the initial support steel frames; B. Under the protection of the arch support, the left and right side walls of the middle steps 3 are excavated alternately and the core soil 4 is reserved. For the initial support, the excavation cycle f...

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Abstract

The invention relates to the technical field of railway tunnel construction, specifically a digging method of IV and V-class surrounding rock railway tunnel with large cross section, aiming to solve the problems of the existing railway tunnel digging method including narrow operation space, low work efficiency, inflexible construction method, instable construction progress, high deformation potential of surrounding rock, and inconvenient operation. The method comprises performing leading support, digging arc-shaped pilot tunnel and preserving core soil; staggeredly digging left/right side walls of middle sidestep and preserving core soil; staggeredly digging left/right side walls of lower sidestep and preserving core soil; sequentially digging upper, middle and lower sidesteps and preserving core soil; and digging inverted arch and carrying out preliminary support. The invention has large construction space and high work efficiency, and can perform multi-job parallel operation. When the geologic conditions are changed, the invention can be flexibly and timely converted to other construction method. Preservation of core soil and left/right staggeredly digging are helpful to the stability of the digging working face. When the surrounding rock has large deformation, the invention can adjust closure time as soon as possible under the prerequisite of assuring safety and meeting requirements of clearance cross section.

Description

technical field [0001] The invention relates to the technical field of railway tunnel construction, in particular to an excavation method suitable for railway large-section IV and V grade surrounding rock tunnels. Background technique [0002] It is well known that the excavation methods of small-section railway tunnels with weak surrounding rocks mainly include ring excavation reserved core soil method and step method, etc. The existing problems of the ring excavation reserve core soil method are as follows: (1) the working space is narrow, which is not conducive to the construction of large machinery, the work efficiency is low, and the surrounding rock exposure time is long; (2) when the geological conditions change, it cannot be flexibly and timely Changing the construction method, the progress is unstable; (3) The upper steps are too high, and the construction is inconvenient; the problems of the step method are: (1) It is not suitable for large-section railway tunnels ...

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Application Information

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IPC IPC(8): E21D9/01E21D11/10
Inventor 霍玉华高治双祁玺剑张金柱徐家定黄直久王毅东彭斌鲍海荣赵华锋吴波赵香萍商崇伦
Owner CHINA RAILWAY 12TH BUREAU GRP
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