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Pipe shed construction method for weak surrounding rock section of tunnel portal

A technology with weak surrounding rocks and construction methods, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problem that the tail of the pipe shed falls into the excavation contour line, the trajectory of the pipe shed drilling process cannot be grasped, and the tunnel excavation surrounding For problems such as grouting and consolidation, the effect of excavation deformation is obvious, the drilling process is precise, and the water consumption is less.

Pending Publication Date: 2020-06-12
贵州省质安交通工程监控检测中心有限责任公司
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  • Application Information

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Problems solved by technology

Although the conventional construction technology is equipped with a guide pipe for the hole, due to the uneven geology, the phenomenon of partial hole often occurs during the introduction hole or drilling process of the pipe shed, and the inspection means are limited during the construction process, so it is impossible to grasp the drilling of the pipe shed. The trajectory of the process cannot effectively achieve the final purpose of grouting and consolidation around the excavation of the tunnel. It is often found that the tail of the pipe shed falls into the excavation contour line after excavation. Therefore, the pipe shed of the conventional construction method is generally Control within 30-40m, the construction progress is relatively slow, and the construction accuracy is also low

Method used

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  • Pipe shed construction method for weak surrounding rock section of tunnel portal
  • Pipe shed construction method for weak surrounding rock section of tunnel portal
  • Pipe shed construction method for weak surrounding rock section of tunnel portal

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Embodiment 1

[0026] Embodiment 1: A method for constructing an ultra-long pipe shed in the weak surrounding rock section of a tunnel entrance, the steps of the method are: step 1, construction preparation; step 2, measurement and setting out; step 3, construction of guide wall 9; The surface of the sub-face and the side and the upward slope are closed; step 5, the drilling machine is in place; step 6, drilling; step 7, the drilling tool is withdrawn; step 8, grouting; step 9, sealing the hole.

[0027] In Step 3, the inner arch frame of the guide wall 9 is firstly installed; secondly, the guide pipe is pre-embedded, and the guide pipe and the arch frame are firmly welded; finally, the guide wall 9 is molded and concrete is poured.

[0028] In step 4, use sprayed concrete to encapsulate, with a thickness ≥ 20cm.

[0029] Step 6: (1) Drill pipe processing: the rod body is a section of 8m, one end of which is threaded inside the car, and one end is threaded outside the car, and local welding ...

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Abstract

The invention discloses a pipe shed construction method for a weak surrounding rock section of a tunnel portal. The method comprises the steps of 1, construction preparation; 2, surveying and settingout; 3, guide wall construction; 4, tunnel face and side and heading slope surface sealing; 5, drilling machine in-place; 6, drilling; 7, drilling tool withdrawing; 8, grouting; and 9, hole sealing. Pipe shed construction precision is ensured by adopting a guide technology, a drilling process provides reference for tunnel excavation according to geological records, and effective advance support provides technical guarantee for tunnel excavation. The pipe shed construction method is accurate in drilling process, free of hole deviation and hole collapse phenomena, high in hole forming efficiency, and suitable for environments such as sand layers and clay layers with complex geological conditions and loose soil texture, and the achieved effect is quite remarkable.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a pipe shed construction method for the weak surrounding rock section at the entrance of the tunnel, and belongs to the technical field of tunnel construction. Background technique [0002] In the opening construction of high-speed railway tunnel projects in my country, pipe sheds are very common as the advance support for entering the tunnel, and the construction methods are also very mature. The two common methods are the method of jacking through the leading hole and the method of drilling with the pipe. There are two main working principles of the pipe shed: a beam structure, which forms a simply supported beam through the guide wall of the hole and the rock formation in the hole; the second one uses grouting to consolidate the surrounding rock around the steel pipe, and the steel pipe and the surrounding rock form together "Arching effect"; the two form a shell-like structure ...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10
CPCE21D11/00E21D11/10
Inventor 李洪建孟刚沙运斌付晓彤高彬
Owner 贵州省质安交通工程监控检测中心有限责任公司
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