Test method for water leakage of shield segment joints

A test method and technology for shield segments, which can solve problems such as water leakage by detecting the appearance of fluid at the leak point, and using liquid/vacuum for liquid tightness measurement.

Active Publication Date: 2019-01-25
TONGJI UNIV
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Problems solved by technology

The invention adopts the standard block of the segment and the special back-type sealing gasket groove to carry out the water leakage test of the segment joint, solves the problem of using the concrete segment to carry out the joint leakage test, and truly reflects the back-type sealing gasket and material The contact characteristics between them can comprehensively consider the relationship between bolt pretightening force, joint opening, structural force and leakage water

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  • Test method for water leakage of shield segment joints
  • Test method for water leakage of shield segment joints
  • Test method for water leakage of shield segment joints

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Embodiment Construction

[0026] The core of the water leakage test method for the back-type gasket groove segment joint is to cut the surface of the concrete segment to form a back-type gasket groove, and use the pre-buried water pipe to conduct the test under a certain load condition or the joint opening condition. Joint leak test.

[0027] The pre-embedded water delivery pipe of the present invention is the water inlet channel for the water leakage test of the segment joint. In order to prevent the water pipe from being damaged and moved during the test, special designs must be made on the size, material and embedding method of the water pipe. Among them, steel pipes are used for water delivery pipes, and the size is mainly determined by the size of the segment and the minimum welding requirements. For details, see figure 1 . The embedding method of the water pipe requires that the A end is drawn out from the joint section, and the B end is drawn out from the outer arc surface of the segment, and ...

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Abstract

The invention relates to a shield segment joint water leakage test method. The method comprises steps of (1), making a water inlet pipe; (2), cutting a segment; (3), making a hollow square groove; (4), making a hollow square sealing pad; (5), coating waterproof glue on a groove surface; (6), assembling the segment, and accomplishing model making; (7), automatically controlling selection of permeameters; (8), loading; (9), utilizing a variable head method or a fixed head method to carry out a tunnel water leakage test; and (10), changing a loading grade, repeating the steps (8) and (9), and acquiring joint force bearing-splaying amount-water leakage relationships. The method is advantaged in that the hollow square groove is made at a segment joint, the variable head method or the fixed head method is utilized to carry out the shield tunnel joint water leakage test, a technical problem in utilizing the shield segment to carry out the tunnel water leakage test is solved, relationships between segment water leakage and influence factors are more accurately reflected, moreover, segment force bearing-joint water leakage, joint splaying amount- joint water leakage relationship curves can be acquired.

Description

technical field [0001] The invention belongs to the field of model test of shield tunnel segment joints. Background technique [0002] The shield tunnel with prefabricated lining has a large number of joints. These criss-cross joints affect the integrity of the tunnel structure and cause many durability problems in the tunnel structure. Among them, the water leakage problem of segment joints is the focus and difficulty of shield tunnel disease prevention and control. The water leakage test of segment joints is the most effective and direct method to study the anti-seepage performance of structures and explore the water leakage mechanism of joints. [0003] The existing water leakage test of segment joints can be roughly divided into two types according to the materials and loading methods used in the model test: (1) stainless steel plate is used to simulate the joint concrete, and the loading is carried out by controlling the bolt stress; (2) two A concrete block was used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/04
CPCG01M3/04
Inventor 张冬梅张兆远尹振宇黄宏伟
Owner TONGJI UNIV
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