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Construction method for controlling deformation of anchor piles at barrel segment of tunnel

A body and tunnel technology, which is applied in the field of construction methods for controlling deformation of anchor piles in the body of tunnels, can solve problems such as cracks on the support surface, subsidence, and concave curvature of rock mass, so as to enhance longitudinal stiffness and bearing capacity, ensure safety and The effect of tunneling efficiency

Active Publication Date: 2016-08-10
THE 1ST ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. After the construction of the initial support of the middle steps, due to the dislocation of the connecting plates of the front and rear arch feet due to uneven settlement, cracks of different degrees appear locally on the surface of the initial support;
[0005] 2. The phenomenon of "concave curvature" appears in the local rock mass at the lower part of the connecting plate of the middle step;
[0006] 3. The cavern support system in the tunnel body is prone to overall subsidence

Method used

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  • Construction method for controlling deformation of anchor piles at barrel segment of tunnel
  • Construction method for controlling deformation of anchor piles at barrel segment of tunnel
  • Construction method for controlling deformation of anchor piles at barrel segment of tunnel

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Embodiment Construction

[0053] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0054] see figure 1 , figure 2 and image 3 , the embodiment of the present invention provides a construction method for controlling deformation of anchor piles in the tunnel body, including the following steps:

[0055] In step S100, the section of the tunnel to be excavated is divided into three parts: the upper step, the middle step and the lower step, and the upper step part is excavated to a depth of M meters in the tunnel body, and the supporting steel frame 30 for initial support is arranged at intervals And lock foot anchor tube 40;

[0056] Step S200, on the basis of the upper step, excavate the middle step part to the depth of the hole body N mete...

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Abstract

The invention provides a construction method for controlling deformation of anchor piles at a barrel segment of a tunnel. The construction method comprises the following steps of: dividing a section of a tunnel to be excavated into three parts, i.e. an upper step, a middle step and a lower step, firstly, excavating the part of the upper step to an in-depth M-meter position of the barrel segment, and arranging supporting steel frames and locking anchor pipes, which are used fora primary support, at intervals; based on the upper step, excavating the part of the middle step to an in-depth N-meter position of the barrel segment, and arranging the supporting steel frames and the locking anchor pipes, which are used for the primary support, at intervals; obliquely inserting reinforcing anchor pipes downwards into tunnel rock mass of the barrel segment at the part of the middle step; based on the middle step, excavating the part of the lower step and arranging the supporting steel frames and the locking anchor pipes, which are used for the primary support, at intervals. Compared with the prior art, in the construction method for controlling deformation of the anchor piles at the barrel segment of the tunnel, which is provided by the invention, the longitudinal rigidity and bearing capacity of the primary support are reinforced, integral sinking, deformation and fracture of a cavern primary support system are controlled, and construction safety and tunneling efficiency of the tunnel are ensured.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for controlling deformation of anchor piles in tunnel body sections. Background technique [0002] The construction of tunnels is in the ascendant in my country, especially in the central and western regions of China, where the construction scale of roads and railways is still far from enough to meet the actual needs. However, there are many hills, mountains, and debris flows in the central and western regions, and the geological characteristics have the remarkable characteristics of "four poles and three highs": extremely strong terrain cutting, extremely complex and active tectonic conditions, extremely weak and broken lithological conditions, and extremely significant seismic effects; stress, high seismic intensity, and high risk of geological disasters. At the same time, most of the central and western regions are natural scenic areas and th...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D11/14
CPCE21D11/00E21D11/10E21D11/14
Inventor 万永昌张建平兰文庆王建兴李文辉王海杰邹红有庞尔林宿春亮钟锐锋曾志新李桂兰余寿伦揭木雄温裕芬
Owner THE 1ST ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP
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