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Treatment structure of shield tunnel operation period over-limit convergence deformation and construction method thereof

A shield tunneling, convergence deformation technology, applied in tunnels, tunnel lining, earthwork drilling and other directions, can solve the problems of segment cracks or misalignment, segment fragmentation, shield tunnel convergence deformation disease and other problems, to prevent deformation and Displacement or partial damage, increase the contact area, increase the effect of anti-pulling effect

Active Publication Date: 2021-07-20
江苏中车城市发展有限公司 +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

All of the above situations may lead to convergence deformation of the shield tunnel
The convergence deformation of the shield tunnel will cause cracks or dislocation between the segments, and in severe cases, it will lead to bolt breakage, joint damage, partial fragmentation of segments, crack expansion and other diseases in the shield tunnel, and even damage to the main structure of the tunnel. Threats to the operational safety of trains or vehicles in shield tunnels
At present, the research and development of shield tunnel convergence deformation control technology is mainly focused on the monitoring and prediction of convergence deformation, that is, through the accurate real-time monitoring of shield tunnel convergence deformation during construction and operation periods, the convergence deformation of shield tunnels can be realized. effective prevention of shield tunneling, but there is still a lack of control technology for shield tunnel overrun convergence deformation

Method used

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  • Treatment structure of shield tunnel operation period over-limit convergence deformation and construction method thereof
  • Treatment structure of shield tunnel operation period over-limit convergence deformation and construction method thereof
  • Treatment structure of shield tunnel operation period over-limit convergence deformation and construction method thereof

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0038] Such asfigure 1 As shown, this embodiment provides a governance structure for overrun convergence deformation of a shield tunnel during the operation period, including a bag-expanded prestressed anchor rod 1, a waterproof layer 2, a circumferential steel beam 3, a longitudinal steel beam 4 and a pair of Support truss 5.

[0039] Such as figure 2 , 3 As shown, the bladder expansion type prestressed anchor 1 is composed of a bladder expansion type prestressed anchor body 1-1, a grouting body 1-2, a prestressed steel bar 1-3 and a grouting bladder; The main body 1-1 of the enlarged prestressed anchor rod of the bladder bag is staggered and runs through the uniformly distributed grouting holes 1-1-1 in the circumferential direction; Slurry 1-2 and prestressed reinforcement 1-3.

[0040] The grouting bag includes a terminal grouting bag...

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Abstract

The invention discloses a treatment structure of shield tunnel operation period over-limit convergence deformation and a construction method thereof. The structure comprises bag expansion type prestressed anchor rods, a waterproof layer, annular steel beams, longitudinal steel beams and diagonal bracing trusses. The contact area of the bag expansion type prestressed anchor rods and surrounding soil of a shield tunnel is increased through expansion type bags, so that the pulling resistance is increased; the prestress of the bag expansion type prestressed anchor rods which are symmetrically arranged on the section of the shield tunnel and the counterforce of jacks of the diagonal bracing trusses are applied cooperatively, so that the over-limit convergence deformation of the section of the shield tunnel can be efficiently treated, and the operation of the shield tunnel can be recovered as soon as possible; and after the section of the shield tunnel returns to normal, the bag expansion type prestressed anchor rods continues to be used normally so as to effectively serve the convergence deformation prevention and control in the whole life cycle of the operation period of the shield tunnel.

Description

technical field [0001] The invention relates to the technical field of convergence deformation control of shield tunnels, in particular to a control structure and a construction method for excessive convergence deformation of shield tunnels during operation. Background technique [0002] Based on the advantages of shield method, such as safety, rapidity, high efficiency, environmental protection and strong adaptability, urban rail transit projects in my country mainly use this method for construction. [0003] The main body of the shield tunnel is the shield segment, which is subjected to (super) high water and soil pressure and complex hydrogeological environment during long-term service, which has high requirements on the quality and durability of the segment; on the other hand, in The operation stage of the shield tunnel is susceptible to some uncertain factors, for example, soil disturbance and loading caused by changes in surrounding hydrogeological conditions, close co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D20/02E21D11/00E21D11/08E21D11/18E21D11/28E21D11/38
CPCE21D21/0026E21D21/0093E21D20/02E21D20/028E21D11/00E21D11/38E21D11/18E21D11/183E21D11/28E21D11/08
Inventor 刘小荣吴增金汪安祥蒋志华孟晨曦齐士乐苏光旭刘念武
Owner 江苏中车城市发展有限公司
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