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Starting method of small-radius curve tunnel

A technology of small-radius curves and tunnels, which is applied in the origination field of small-radius curves tunnels, can solve the problems that the facilities are easily stuck by the segments, unable to originate in a straight line, and the space of the origination shaft is too small to install the reaction frame, etc., to achieve Significant comprehensive benefits, simple structure and reduced risk

Active Publication Date: 2015-04-22
CHINA RAILWAY 17 BUREAU GRP NO 6 ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the starting period, sometimes the shield machine cannot start in a straight line due to the problem of the starting line, and the space of the starting shaft is too small to install the reaction frame. Initiation brings more challenges

Method used

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  • Starting method of small-radius curve tunnel
  • Starting method of small-radius curve tunnel
  • Starting method of small-radius curve tunnel

Examples

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Embodiment Construction

[0028] Such as figure 1 , Figure 5 , Figure 6 As shown, 1—shield machine, 2—cutter head, 3—front shield, 4—middle shield, 5—tail shield, 6—trolley, 7—steel pipe support, 8—segment (negative ring segment), 9—shield shell, 10—starting shaft, 11—starting portal, 12—segment positioning pad, 13—guide rail, 14—centerline of portal, 15—centerline of launching frame, 16—design tunnel center Curve, 17—Shield Tunneling Centerline

[0029] Such as figure 2 , image 3 As shown, the present invention is a method for starting a small-radius curved tunnel, comprising the following steps:

[0030] (1) Put the shield machine 1 from the launch shaft 10 into the formed tunnel and assemble the shield machine 1 in the launch shaft 10;

[0031] (2) Design the tunnel center curve at the portal 11 where the tunnel and the originating shaft 10 intersect, and the center line of the line to be perpendicular to the portal 11; determine the angle between the shield machine 1 and the normal line o...

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Abstract

The invention discloses a starting method of a small-radius curve tunnel. The starting method of the small-radius curve tunnel includes the following steps that the angle between a shield tunneling machine and the normal of a tunnel entrance and the maximum deviation position of the central line of the shield tunneling machine and a designed tunnel are determined through calculation and fitting, before the maximum deviation position, a duct piece on the shield tunneling machine is installed in a half ring mode, and after exceeding the maximum deviation position, the duct piece on the shield tunneling machine is installed in a full ring mode; an annular plate is installed on the upper half part of the first duct piece installed in the full ring mode. Through the structure form combining half-ring duct pieces and a steel support, the problem that starting turning is difficult for a curved tunnel shield is solved, and discharging supply in the tunneling process is facilitated. The starting method of the small-radius curve tunnel does not need a counter-force frame, the duct pieces directly act on a rear hole duct piece serving as the counter-force frame, the space between the duct pieces and the rear hole duct piece is filled compactly through a steel plate, the steel pipe support acts on a starting well ground connecting wall, work efficiency is improved, and the starting method is suitable for a small shield work surface.

Description

technical field [0001] The invention relates to a tunnel excavation method, in particular to a starting method for a small-radius curved tunnel. Background technique [0002] With the development of my country's urban rail transit, shield technology has a high degree of mechanization and labor intensity due to the comprehensive application of high-tech in the fields of computer, machinery, and new material system science, and the monitoring of the construction process through advanced electronic information technology. Low cost, safe and fast, and many other advantages, the shield construction method has established a solid dominant position in urban tunnel construction technology, and has become an indispensable general tunnel construction technology. Through a large number of engineering practices, shield technology has been continuously improved and innovated and developed rapidly. [0003] In the urban rail construction in recent years, due to safety and cost considerati...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21D11/08
CPCE21D9/0607E21D11/08
Inventor 李春芳朱国烽唐清照郑礼均章尤铁
Owner CHINA RAILWAY 17 BUREAU GRP NO 6 ENG
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