Metro shield tunnel extension steel ring initial construction method

A technology for subway shield tunneling and construction methods, which is applied in tunnels, earth-moving drilling, mining equipment, etc., can solve the problems of delaying the starting progress of shield tunneling machines, increasing the risk of shield tunneling starting, and affecting the construction environment of workers. Achieve the effect of eliminating instability, shortening the construction period, and avoiding construction environment pollution

Inactive Publication Date: 2018-09-21
CHINA CONSTR FOURTH ENG DIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

According to past construction experience, manual chiseling of the ground connection wall is a time-consuming and risky work. During the chisel removal process, a large amount of dust pollution will be generated, which will affect the construction environment

Method used

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  • Metro shield tunnel extension steel ring initial construction method
  • Metro shield tunnel extension steel ring initial construction method
  • Metro shield tunnel extension steel ring initial construction method

Examples

Experimental program
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[0037] The present invention will be further explained below in conjunction with the drawings:

[0038] Such as Figure 1-Figure 5 As shown, a starting construction method for the extension steel ring of a subway shield tunnel includes the following steps:

[0039] a. Check the ground effect of the starting end. Before the start of the formal construction of the shield, 9 horizontal openings 7 should be drilled along the solidified area in the door circle. The depth of the opening 7 is the longitudinal end reinforcement. Half of the length, observe the water seepage;

[0040] b. Installation of the portal extension ring 1, which is connected by M20 bolts between one end of the portal extension ring 1 and the portal steel ring;

[0041] c. Install the truss structure in the departure well for subsequent assembly, retest the departure section of the main body of the station, determine the actual deviation and start to install the truss structure;

[0042] d. Cooperate afterwards to assem...

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Abstract

The invention discloses a metro shield tunnel extension steel ring initial construction method. The method comprises the following steps that 1, initiating end stratum effect inspection is conducted,nine tunnel portal manholes are made in the range of a solid in the tunnel portal ring before formal construction of shield launching, wherein the depth of the tunnel portal manholes is half of the longitudinal length of end reinforcement, and the water seepage situation is observed; 2, a tunnel portal extension ring is installed, wherein one end of the tunnel portal extension ring is connected with a tunnel portal steel ring through an M20 bolt. The method has the advantages that the extension steel ring replaces the method that even wall is chiseled away manually to obtain a cutter rotationspace, the phenomenon that construction environment pollution is caused in the process of chiseling away the even wall is avoided, and meanwhile the phenomena that after the wall is chiseled, the tunnel face is unstable, and collapsing occurs are eradicated; compared with the method of manually chiseling away the even wall, extension steel ring installation is easy and rapid, and the shield launching construction period is shortened; gushing, air leakage, earth subsidence and the like occurring at the time of shield launching are effectively controlled, and the influence on surroundings is small.

Description

technical field [0001] The invention relates to the technical field of excavation and excavation construction of a subway shield tunnel, in particular to a construction method for the initiation of an extended steel ring of a subway shield tunnel. Background technique [0002] At present, subway construction in major cities across the country is being carried out on a large scale. Shield construction is the protagonist of subway construction, and the initial entry of shield tunnels is a major source of risk during shield construction. In previous constructions, due to the short distance between the door seal and the face of the tunnel, in order to ensure that the cutter head of the shield machine will not damage the cord rubber sheet when the ground connection wall is broken, the cutter head should be removed Before the ground connection wall, the ground connection wall is usually chiseled to a depth of 60cm by manual operation to ensure the space for the cutter head to rota...

Claims

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Application Information

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IPC IPC(8): E21D9/06
CPCE21D9/06
Inventor 康卫刘双红李冬
Owner CHINA CONSTR FOURTH ENG DIV
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