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Narrow wing type advanced small conduit and group pipe effect collapse prevention construction technology thereof

A technology of advanced small conduit and construction technology, which is applied in the field of narrow airfoil advanced small conduit and its anti-collapse construction technology of group pipe effect, which can solve the problems of long time consumption and difficulty in forming a support scaffolding system, and achieve reasonable construction technology, Effects of reducing surface subsidence and preventing collapse

Pending Publication Date: 2022-02-18
CHINA RAILWAY 18TH BUREAU GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of preventing collapse takes a long time, and it is difficult to form a strong supporting scaffolding system for the vault. Like the "group pipe curtain", it is very likely to collapse again during the excavation process

Method used

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  • Narrow wing type advanced small conduit and group pipe effect collapse prevention construction technology thereof
  • Narrow wing type advanced small conduit and group pipe effect collapse prevention construction technology thereof
  • Narrow wing type advanced small conduit and group pipe effect collapse prevention construction technology thereof

Examples

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Embodiment Construction

[0033] Such as Figure 1-2 As shown, a narrow airfoil type leading small catheter includes a catheter body 1, the catheter body 1 adopts a hollow metal tube, the pipe wall of the catheter body 1 is provided with a grouting hole 2, and the front end of the catheter body 1 Set as a tapered tip 101 , a flat plate 3 is provided on the outer wall of the catheter body 1 , and the flat plate 3 is connected to the tail end of the catheter body 1 .

[0034] Specifically, the center of the flat plate 3 fits on the outer wall of the catheter body 1 and is welded together. One end of the flat plate 3 is set as a vertical side, and the other end is set as a V-shaped side, and one side of the vertical side is close to the tail of the catheter body 1, and is 40 to 50 cm away from the tail end of the catheter body 1. One side of the V-shaped side is close to the front end of the catheter body 1 and is 130-150 cm away from the front end surface of the catheter body 1 . After the improved str...

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Abstract

The invention discloses a narrow wing type advanced small conduit. The conduit comprises a conduit body, wherein the conduit body is a hollow metal pipe, grouting holes are formed in a pipe wall of the conduit body, a front end of the conduit body is arranged to be a conical tip, a flat plate is arranged on an outer wall of the conduit body, and the flat plate is connected to a tail end of the conduit body; the group pipe effect anti-collapse construction technology mainly comprises four steps of S1, construction preparation, S2, steel arch frame installation, S3, narrow wing type advanced small pipe construction and S4, small pipe grouting construction, and finally the group pipe effect is formed on a tunnel face through a first set of small pipes and a second set of small pipes; and an effective advanced shed protection system is formed in the tunnel excavation range by combining with a steel arch frame and an arched masonry layer. The narrow wing type advanced small guide pipe is simple in structure, reasonable in construction process and easy to operate, an effective curtain group pipe effect is formed, the whole excavation section is supported, and the trend of stratum deformation and sliding is prevented in advance.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a narrow airfoil type leading small conduit and its group-tube effect anti-collapse construction technology. Background technique [0002] When a shallow-buried underground excavation tunnel passes through a fully weathered stratum, it is very easy to collapse and lose blocks. The collapsed body is often accompanied by a certain amount of water seepage, which restricts the excavation construction of the tunnel; advance grouting pre-reinforcement takes a long time and takes a small amount of time. Conduit densification, block excavation support, etc. cannot effectively prevent block falling and collapse. After small ducts are densified, weak loose objects will still collapse from the duct gap, which cannot effectively provide time and space for arch installation . [0003] At present, for fully weathered strata with a certain amount of water seepage, the traditional pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/18
CPCE21D11/10E21D11/107E21D11/183
Inventor 高海东李昕曾琛超李玉华杨林松郭彦兵赵映冠危君安陈坤张远明高鹏王军堂董道波张皓迪邓志豪
Owner CHINA RAILWAY 18TH BUREAU GRP CO LTD
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