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Tunnel portal breaking method by using shield tunneling machine on quicksand strata

A technology of shield machine and tunnel door, which is used in earth-moving drilling, mining equipment, tunnels, etc., can solve the problems of risk in the removal of tunnel doors in quicksand formations, and achieve the effect of reducing risks and ensuring safe reception.

Active Publication Date: 2014-07-30
CHINA TIESIJU CIVIL ENG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for breaking the door of a shield machine in a quicksand formation, which solves the problem of risk in breaking a door in a quicksand formation, and has the characteristics that the shield machine can reach the receiving well of the shield machine quickly and safely, and Better control of the phenomenon of water gushing and sand gushing in the process of breaking the cave door

Method used

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  • Tunnel portal breaking method by using shield tunneling machine on quicksand strata
  • Tunnel portal breaking method by using shield tunneling machine on quicksand strata
  • Tunnel portal breaking method by using shield tunneling machine on quicksand strata

Examples

Experimental program
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Embodiment

[0022] The enclosure structure of Duantou well adopts the form of underground continuous wall, the wall thickness is 800mm, and there are two layers of steel bars inside and outside.

[0023] The hole door is demolished twice manually.

[0024] ① Break the outer protective layer for the first time, and break it in order from bottom to top, that is, start to break the concrete on the surface from the bottom of the hole, the thickness is 50mm, and the remaining 750mm concrete can be broken after the outer row of steel bars are cut off;

[0025] ② A circular opening with a diameter of 1500mm is chiseled at the center of the door;

[0026] ③ The shield machine 102 starts to advance, the cutter head 103 leans against the ground wall, and the knife tip 104 is exposed;

[0027] ④ Destroy the remaining walls and cut off the steel bars;

[0028] ⑤ The shield machine 102 is jacked forward until the shield tail is completely put on the shield and the tail of the shield comes out of the...

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Abstract

The invention relates to a tunnel portal breaking method by using a shield tunneling machine on quicksand strata. An end wall building envelope is an underground continuous wall, and the portal breaking is double breaking and comprises two steps that when a tool nose of the shield tunneling machine is arranged at a distance of 500mm from the continuous wall, the first breaking of outer protective layer starts, and reinforcing steel bars are cut layer by layer after completion; for the second breaking, concrete at the center of the portal is broken into a circular opening by an air pick, the shield tunneling machine starts to propel, a cutterhead is pushed onto the continuous wall, and the tool nose is exposed, so that the residual wall body concrete is broken from top to bottom until the second row of reinforcing steel bars are exposed to be cut out; the last protective layer concrete of the continuous wall body is directly burst by the shield tunneling machine, and the receiving task is completed until all shield tunneling machines are put away. The tunnel portal breaking method solves the risk problem of the portal breaking on the quicksand strata, and has the characteristic that the shield tunneling machine quickly and safely reaches to a shield turning receiving well, and the water and sand gushing phenomena in the portal breaking process are better controlled.

Description

technical field [0001] The invention relates to a method for removing a door of a shield machine in a quicksand formation. Background technique [0002] In many shield construction fields, before the arrival of the shield machine, the enclosure structure of the shield receiving shaft must be dug out before the shield tunnel can reach it. When the reinforcement effect of the end well is good and the geological conditions are good The hole door can be chiseled out according to the conventional method. Complex geological conditions are likely to appear in the shield launching and receiving areas, such as water-rich sand layers, large underground water volume, etc. For this complex geological situation, conventional methods may cause water and sand gushing, and large-scale Accidents such as ground collapses have caused great social impact. Contents of the invention [0003] The purpose of the present invention is to provide a method for breaking the door of a shield mach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00
Inventor 马学仕何振兴高磊曹伟王辉郭航李仲锋朱川鄂邓能伟鲍俊捷方鲁兵刘倩张超
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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