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Anti-permeability performance test system for shield tunnel segment circumferential seams

A shield tunnel segment and test system technology, which is applied in the field of shield tunnel segment circumferential seam impermeability test system, can solve the problems of difficulty in accurately reflecting the waterproof sealing mechanism, small size of cover plate, low test accuracy, etc. The test results are true and reliable, the effect of reducing the processing cost and shortening the test time

Inactive Publication Date: 2016-03-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The front shield tunnel segments are mainly prefabricated reinforced concrete segments, and the use of steel grooves cannot reflect the real contact behavior between the rubber material of the elastic gasket and the concrete grooves, so there is a big discrepancy between the test results and the actual project;
[0006] 2) A large number of engineering cases show that due to the superimposition of multiple factors such as the construction deviation of the segment assembly machine during the construction stage and the differential settlement of the soft soil layer during the operation stage, the gap of 15mm is very easy to occur in the ring joint and the ring joint, and it is limited to the cover Due to the size of the plate, it is impossible to carry out the joint large dislocation test;
[0007] 3) Bolt compression is used to simulate the opening amount of the seam, and the gasket limit is used to simulate the amount of seam misalignment, which requires manual adjustment and measurement, and the test accuracy is low;
[0008] 4) The patent for this invention is located in subway tunnels with a diameter of about 6m that are waterproofed with a single-channel elastic gasket. waterproof ability;
[0010] 6) The waterproof ability of the actual reinforced concrete segment joints under different opening angles cannot be simulated
[0011] 7) The waterproof test based on the steel mold fixture cannot simulate the actual force mechanism and contact state of the reinforced concrete segment joints
[0012] In addition, through the investigation of related patents and documents at home and abroad, no test device that can analyze and evaluate the waterproof and sealing ability of tunnel annular joints has been found.
[0013] In summary, in view of the complex stress state and contact behavior of shield tunnel segment joints, it is difficult for small-scale indoor model tests to accurately reflect its true and reliable waterproof and sealing mechanism. The permeability test system is very important for promoting the in-depth development of shield tunnel waterproofing technology

Method used

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  • Anti-permeability performance test system for shield tunnel segment circumferential seams
  • Anti-permeability performance test system for shield tunnel segment circumferential seams
  • Anti-permeability performance test system for shield tunnel segment circumferential seams

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Embodiment

[0056]The test system for the impermeability of the annular joints of shield tunnel segments, the structure of which is as follows: figure 1 As shown in the figure, it mainly includes a segment specimen 1 used for the circumferential seam impermeability test, and a hydraulic loading assembly, which mainly includes a water supply tank 2, a hydraulic press 3, a hydraulic pressure gauge 6, a valve 4 and a water storage tank 5 with a scale. The hydraulic loading assembly and the frame 7 together form the segment loading assembly, such as Figure 2-4 shown. Observation and recording components mainly include laser displacement sensors and digital close-range photogrammetry equipment. Next, the above components will be further described in detail.

[0057] The specific structure of the segment test piece 1 is as follows: Figure 5-19 As shown, the segment test piece 1 is mainly composed of two types: A-type segment and B-type segment. Among them, A-type segment is composed of seg...

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PUM

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Abstract

The invention relates to an anti-permeability performance test system for shield tunnel segment circumferential seams. The system comprises a segment test piece positioned in a frame and used for an anti-permeability performance test of the circumferential seams, a water pressure loading assembly including a water supply tank, a hydraulic press, and a water storage tank with a scale connected in sequence via a water pipe, and an observation record sub-assembly including a laser displacement sensor and digital close-range photogrammetric equipment. According to the system, a conventional segment joint mechanical performance test system is employed for loading, a water-resistant performance test of the shield tunnel lining segment circumferential seams is accomplished, the stress and deformation states of the shield tunnel circumferential seams in the practical condition are accurately simulated, the waterproof capability of the shield tunnel circumferential seams in conditions of different opening amounts, dislocation amounts, and opening angles is tested, quantitative reference basis is provided for the seam waterproof fine design of tunnel engineering, the consistency of the manufacturing precision of test segment members and actual tunnel segments and the accuracy of test data are guaranteed, the machining cost of a steel die of the test piece is reduced, and the test time is reduced.

Description

technical field [0001] The invention relates to a test device, in particular to a test system for the impermeability of the annular seam of a shield tunnel segment. Background technique [0002] With the steady progress of the new round of urbanization in my country, urban rail transit has become an important way to expand the physical space of the city and facilitate people's travel. As the core of the urban rail transit system, the shield tunneling method is widely used. At present, shield tunnel lining structures are mostly made of prefabricated reinforced concrete segments spliced ​​by connecting bolts. Due to the structural characteristics of segment joints, the stiffness and bearing capacity of the joints are much lower than the stiffness and bearing capacity of the segments themselves. The weak link of the force, especially in the stratum with small lateral pressure coefficient such as silty soft soil, is prone to large joint corner deformation, joint opening deforma...

Claims

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Application Information

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IPC IPC(8): G01M3/02
Inventor 龚琛杰丁文其蔡永昌吴炜枫
Owner TONGJI UNIV
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