Double-side-wall-pilot-hole subsection bench cut method construction method

A double-side-wall pilot pit and construction method technology, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of large force on the tunnel structure, long construction period, and poor support integrity, so as to improve the construction period , speed up the construction progress, increase the effect of the working face

Inactive Publication Date: 2012-10-10
BEIJING ROAD & BRIDGE CONSTR GROUP
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The integrity of the initial support of these methods is poor, and repeated disturbances cause greater stress on the tunnel structure, and the construction method on both sides first and then in the middle also requires a longer construction period

Method used

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  • Double-side-wall-pilot-hole subsection bench cut method construction method
  • Double-side-wall-pilot-hole subsection bench cut method construction method
  • Double-side-wall-pilot-hole subsection bench cut method construction method

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Embodiment Construction

[0057] The present invention will be described in detail below.

[0058] figure 1 It is a schematic diagram of the construction method of double-side-wall pilot pits with step-by-step method according to an embodiment of the present invention. Such as figure 1 As shown, the step-by-step construction method of the double-side pilot pit includes the following steps:

[0059] (1) First excavate pilot pits on both sides of the upper steps for temporary support and initial support;

[0060] (2) Then excavate the pilot hole in the middle of the upper step for temporary support and initial support;

[0061] (3) Excavate pilot pits on both sides of the lower steps for temporary support and initial support;

[0062] (4) Excavate the pilot hole in the middle of the lower steps for temporary support and initial support.

[0063] That is, if figure 1 As shown, the excavation sequence is ①→②→③→④→⑤→⑥.

[0064] First, a large pipe shed is built along the arch of the tunnel, and the gr...

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Abstract

The invention relates to a double-side-wall-pilot-hole subsection bench cut method construction method, which comprises the steps that 1, upper bench two-side pilot holes are dug, and temporary support and preliminary bracing are carried out; 2, an upper bench middle pilot hole is dug, and the temporary support and the preliminary bracing are carried out; 3, lower bench two-side pilot holes are dug, and the temporary support and the preliminary bracing are carried out; and 4, a lower bench middle pilot hole is dug, and the temporary support and the preliminary bracing are carried out. The construction method has the advantages that the disturbing influence on surrounding rock bodies caused by the large cross-section tunnel six-part digging is smaller than that in the prior art, the work surface is increased, the work efficiency is improved, the surrounding rock convergence deformation restricting capability is improved, the integral performance of the preliminary bracing is improved, the operation efficiency is improved through reducing the work procedure alternation, and the disturbance on the surrounding rock is reduced through reducing the temporary support.

Description

technical field [0001] The invention relates to the technical field of urban rail transit engineering, in particular to an excavation construction method for urban shallow-buried large-section tunnels. Background technique [0002] With the rapid development of large and medium-sized urban rail transit in my country, urban subway, light rail and other lines often need to build urban shallow tunnels. Lines in some sections intersect and converge to form large-section or even super-large-section tunnels. The construction of large-section tunnels has a greater impact on surrounding buildings, road surfaces and the environment. In addition, urban rail transit is mostly located in densely populated areas. The construction has caused people to travel under heavy traffic pressure and has high requirements for the construction period. In many places, blasting technology cannot even be used. [0003] How to quickly and safely build urban underground tunnels in the bustling urban ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00
Inventor 周世生李凌宜杨玉杰吕嘉阳文华孙景凤
Owner BEIJING ROAD & BRIDGE CONSTR GROUP
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