Small-radius shield curve launching construction technology on gravel clay layer

Abstract

A small-radius shield curve launching construction technology on a gravel clay layer relates to the technology of construction processes on a gravel clay layer, and comprises the following steps: 1, selecting a launching path; 2, reinforcing launching end stratum; 3, chiseling off a launching end portal; 4, mounting the launching end portal in a sealing manner; 5, mounting a launching base; 6, splicing partial segments; 7, mounting a reaction frame; and 8, controlling the shield curve launching posture. The small-radius shield curve launching construction technology is simple in process and reasonable in design, ensures continuous normal working of a shield, guarantees the launching quality and the tunnel construction progress and security and improves the economical benefits.

Description

Technical field: [0001] The invention relates to a construction technology of a gravel clay layer, in particular to a small-radius shield curve initiation construction technology of a gravel clay layer. Background technique: [0002] Generally, shield tunneling starts at a straight line or a gentle curve section, and starting at a curved section with a radius of less than 500m cannot ensure the continuous and normal transition of the shield tunnel from a non-earth pressure equilibrium state to an earth pressure equilibrium state, and it is easy to cause reaction frames, The uneven force on the negative ring segment leads to excessive deformation of the reaction force frame, rupture of the negative ring segment, and excessive axis deviation, which affects the quality of the initial launch, which in turn affects the progress, safety and economic benefits of tunnel construction. Invention content: [0003] The purpose of the present invention is to provide a small-radius shie...

AI Technical Summary

Problems solved by technology

[0002] Generally, shield tunneling starts at a straight line or a gentle curve section, and starting at a curved section with a radius of less than 500m cannot ensure that the shield tunnel can transition from a non-earth pressure equilibrium state to an earth pressure equilibrium state continuously and normally, and it is easy to cause reaction frames, The uneven force on the negative ring segment will lead to excessive deformation of the reaction frame, rupture of the negative ring segment, and excessive axis deviation, which will affect the starting quality, and then affect the progress, safety and economic benefits of tunnel construction

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