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

A construction technology and clay layer technology, which is applied in the field of starting construction technology of small radius shield tunneling curves in sandy gravel clay layer, can solve the problem of excessive deformation of the reaction force frame, uneven force of the reaction force frame and negative ring segment, and the impact on the start of the tunnel. Hair quality and other issues

Active Publication Date: 2015-09-16
BEIJING NO 4 MUNICIPAL CONSTR ENG +1
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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

Method used

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

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[0017] Below in conjunction with accompanying drawing, the present invention is described in detail.

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0019] see figure 1 , the specific implementation mode adopts the following technical scheme: its construction technology is as follows:

[0020] 1. Selection of starting path: Reasonably calculate the angle between the reaction frame, the base and the portal, and ensure that the distance between each point on the axis extension line of the shield machine before the shield machine breaks away from the base and the center line of the tunnel is not greater than 50mm. Sinc...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/06E21D9/093E21D11/00
Inventor 史磊磊陈希林孔恒郭彩霞卢常亘马福利
Owner BEIJING NO 4 MUNICIPAL CONSTR ENG
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