Method for measuring flexural rigidity of immersed tube tunnel joint

A technology of immersed tunnel and bending stiffness, which is applied in the direction of applying stable tension/pressure to test the strength of materials, which can solve problems such as inconvenience in engineering design

Active Publication Date: 2014-05-14
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, the joint bending stiffness K θ There is no ready-made measurement...

Method used

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  • Method for measuring flexural rigidity of immersed tube tunnel joint
  • Method for measuring flexural rigidity of immersed tube tunnel joint
  • Method for measuring flexural rigidity of immersed tube tunnel joint

Examples

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Embodiment 1

[0042] Such as figure 1 As shown in the structural diagram of the immersed tube tunnel joint, the inside of the immersed tube 7 is provided with a connecting steel cable 5, and the connecting steel cable 5 is sleeved in the sleeve 3, and the sleeves 3 of the two immersed tubes are connected by a connector 4, and the Set GINA waterstop 1 and Ω waterstop 2 at the gap where the two casings meet.

[0043] The present invention proposes reasonable simplifications according to the structural characteristics of the joints of the immersed tube tunnel, assuming that: (1) because the thickness and stiffness of the roof, floor and side wall at the joint position of the immersed tube tunnel joint are much greater than the GINA waterstop at the joint, the section of the joint can be It is assumed that it is a rigid plate without bending deformation; (2) the GINA waterstops arranged along the top and bottom plates of the joint section of the immersed tube tunnel are respectively simplified as...

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Abstract

The invention relates to a method for measuring the flexural rigidity of an immersed tube tunnel joint. The method comprises the following steps: 1, applying an axial external water pressure N0 to the immersed tube tunnel joint as an external force applied to a position having a distance of an initial eccentric throw e0 to the neutral axis of the immersed tube tunnel joint; 2, continuously applying prestressed cable pretensions T1 and T2 to the immersed tube tunnel joint; 3, measuring the displacement S0 and the corner theta of a GINA waterstop under the action of N0, T1 and T2; 4, using an immersed tube tunnel joint structure simplification model established by a steel plate and a spring element to calculate the compression amount SF1 and SF2 of the GINA waterstop, the prestressed cable extension amount ST1 and ST2 at a top board and a bottom board, the pressures F1 and F2 of the GINA waterstrop of the top board and the bottom board, and the pulling forces T1 and T2 of the prestressed cables of the bottom plate; and 4, calculating according to a force balancing equation to obtain the flexural rigidity Ktheta of the joint. Compared with the prior art, the method provided by the invention improves the design level and efficiency of the performance of the immersed tube tunnel joint.

Description

technical field [0001] The invention belongs to the field of immersed tube tunnel engineering, and particularly relates to the most critical component design in immersed tube tunnel engineering, that is, a method for measuring the bending stiffness of joints between two adjacent pipe sections. Background technique [0002] Immersed tube joints are connecting components between immersed tube sections. Since the stiffness of the joint is much smaller than that of the normal pipe section, the uneven settlement and other deformations of the entire immersed tube tunnel are concentrated in the joint, making the joint the focus of stress and deformation. The normal pipe section has high strength and rigidity, good durability and safety, so the joint becomes the weakest and very critical link in the entire immersed tunnel. [0003] Since the 1960s, with the emergence of rubber waterstops, flexible joints have been used more and more widely in immersed tunnels. The flexible joint i...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/10
Inventor 袁勇禹海涛陈越钟辉虹苏宗贤刘洪洲李贞新陈之毅
Owner TONGJI UNIV
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