A test method for waterproof performance of shield tunnel segment joints

Abstract

The invention relates to a method for testing waterproof performance of shield tunnel segment joints. The method comprises the following steps: thrust is applied to segments by adjusting a jack on a horizontal jack support table on a movable segment support frame, and the faulting amount of segment joints is adjusted to achieve the preset faulting amount of tests; after a segment longitudinal joint assembling self-balance loading device is mounted, pulling force is applied through an oil cylinder jack to oppositely pull two segments until the preset joint opening amount is reached, loading isstopped, and a subsequent segment longitudinal seam waterproof performance test is performed under the condition of stable pressure; a segment annular joint self-balance loading device is mounted, twosegments are closed by applying thrust until the preset joint opening amount is reached, loading is stopped, and a subsequent segment annular joint waterproof performance test is performed under thecondition of stable pressure; an external water pressure test is performed: water pressure is increased gradually, pressure is stabilized for a period of time after each increase of water pressure, ifthe segment joints leak, a water pressure value indicated by a water pressure gauge at the time is the water pressure that can be borne by the segments at the preset opening amount and faulting amount, otherwise, pressure is applied continuously until the segment joints leak. Segment assembly simulation can be realized, and a complicated working state of an elastic rubber sealing gasket in accordance with actual engineering is presented.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel engineering, and in particular relates to a method for testing the waterproof performance of joints of shield tunnel segments. Background technique [0002] With the advancement of urbanization and rapid economic development, the use of underground space resources can effectively solve the crises of population, environment, and resources faced by cities. Therefore, the development of underground space has gradually become the mainstream trend of urban development. Since 1984, when the Shanghai Tunnel Engineering Company adopted the earth pressure balance shield for the first time in my country, the construction of tunnels using the shield method has gradually formed a relatively mature system of structural design calculation theory and engineering practice in my country. The understanding of waterproofing is still insufficient, and the degree of attention to tunnel waterproofing is relatively...

AI Technical Summary

Problems solved by technology

[0004] 1. In the actual work of segment joint waterproofing, the gasket is mainly pasted in the concrete sealing groove. In the above test device, the gasket is pasted in the steel sealing groove, resulting in a large deviation in the waterproof test structure of the gasket;

[0005] 2. The above test is only a local waterproof performance test of the elastic rubber gasket, and cannot fully simulate the complex working state of the gasket at the joint of the full-scale lining segment in the actual project;

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