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A method for establishing a refined model for the floating and staggered stage of the segment ring out of the shield tail

A construction method and technology for shield segments, which are used in earth-moving drilling, design optimization/simulation, instruments, etc., which can solve the problem of unclear change rules of upper buoyancy time, unclear contribution of shear stiffness of joints between segments and rings, etc. question

Active Publication Date: 2022-08-02
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are two problems in solving this problem: 1) How to determine the buoyancy force of the slurry on the segment ring and how to change it with time is unclear; 2) In order to reduce the misplacement of the segment ring, a A variety of positioning bolts, positioning concave-convex tenon and other forms, their contribution to the shear stiffness of the ring-to-segment joint is currently unclear

Method used

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  • A method for establishing a refined model for the floating and staggered stage of the segment ring out of the shield tail
  • A method for establishing a refined model for the floating and staggered stage of the segment ring out of the shield tail
  • A method for establishing a refined model for the floating and staggered stage of the segment ring out of the shield tail

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Embodiment 1

[0046]During the construction of a large-diameter shield tunnel in a Chengdu subway, the segment ring that has just come out of the shield tail has the risk of floating, misplacement or even leakage.

[0047] The first step is to investigate the structure and mechanical parameters of the shield segment ring

[0048] After investigation, the outer diameter of the tunnel is 8.3m, the inner diameter is 7.5m, and the ring width is 1.5m. The segment is made of C50 concrete, the main bar is HRB400 steel bar, the ring seam is connected by 19 M30 bolts, the mechanical performance of the bolt is 8.8, the initial gap between the bolt and the bolt hole is 3mm, and 19 independent positioning tenons are set, which are evenly distributed on the segment ring. On the side, there is a 2.5mm free deformation space between the positioning tenon and the slot.

[0049] Step 2: Determine the shear stiffness of adjacent segment ring joints

[0050] After investigation, the adjacent segment ring jo...

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Abstract

The invention relates to a method for establishing a refined model for the upward floating and staggered stage of a segment ring detached from a shield tail. After determining the design information of the tunnel structure, the establishment can consider the upward buoyancy of the segment, the thrust magnitude and direction of the shield tail jack, A refined numerical model of the shear stiffness of adjacent segment-ring joints. The invention utilizes the self-made buoyancy test device to accurately test the buoyancy of the segment, which can better reflect the buoyancy of the segment in the state of grouting and wrapping behind the wall. Considering the change in the thrust size and direction of the shield tail jack on the segment ring caused by the attitude change of the shield machine, it can better reflect the longitudinal force characteristics of the shield tail segment ring during the actual construction of the tunnel and the influence on the segment floating. Considering the shear stiffness of the adjacent segment ring joints, it can better reflect the longitudinal characteristics of the shield tail segment ring bending deformation and shear deformation, and more accurately determine the displacement, misalignment and additional internal force caused by the shield tail segment ring floating. , to provide the basis for the construction process control.

Description

technical field [0001] The invention relates to a method for establishing a fine model for the floating and staggered stage of a segment ring detached from a shield tail, and belongs to the technical field of underground engineering construction. Background technique [0002] With the rapid development of my country's national economy and the rapid expansion of urban scale in my country, urban traffic congestion has become a common problem in large cities. The use of large-flow subway transportation is an effective form of transportation organization for efficient operation in large cities, and the shield tunnel construction method has become the mainstream method of urban subway construction due to its small impact on urban traffic and the functions of safe, efficient and rapid excavation. [0003] The construction process of segment assembly at the tail of the shield machine will inevitably lead to an annular gap between the assembled segment ring and the stratum—the shiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23E21D9/06E21D11/08G06F119/14
CPCE21D9/0607E21D11/08
Inventor 钟小春
Owner HOHAI UNIV
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