Waterproof elastic sealing gasket for segment joint of shield tunnel

Abstract

The invention discloses a waterproof elastic sealing gasket for a segment joint of a shield tunnel. The waterproof elastic sealing gasket is characterized in that the waterproof elastic sealing gasketcomprises a silicon foam inner core and an ethylene-propylene-diene monomer (EPDM) rubber outer tire wrapping the silicon foam inner core. During using, two pieces of elastic sealing gaskets are pasted in waterproof inserting grooves in two adjacent segments in a mirror symmetry mode correspondingly, and the sealing gaskets are extruded after the segments are spliced, so that the silicon foam inner cores contracts and produce contact stress, thus EPDM rubber is mutually fitted and extruded, and a waterproof sealing function is achieved accordingly. Compared with a single-component EPDM through hole rubber sealing gasket commonly used in the existing engineering technology field, the waterproof sealing gasket with the additionally-arranged silicon foam inner core has the advantages of uniform contact stress, close fitting, long-term load maintaining ability, high elasticity recovery ability and the like, the stress relaxation phenomenon of the waterproof sealing gasket under the long-term pressure can be effectively reduced. The waterproof elastic sealing gasket has great value for long-term waterproof performance of the shield tunnel.

Description

technical field [0001] The invention belongs to the field of shield tunnel engineering, and in particular relates to a waterproof elastic gasket for the joints of shield tunnel segments. Background technique [0002] In recent years, with the rapid development of social economy and urbanization, shield tunneling technology has become an indispensable key technology in the construction of major transportation and other infrastructure in my country. Due to the characteristics of the lining structure of the shield tunnel, the waterproofing of the segment joints is very important for the normal use of the tunnel and the safety of the surrounding environment. [0003] At present, in the field of engineering technology, single-component EPDM rubber (inner through-hole) gaskets or EPDM rubber (inner through-hole) gaskets lapped with water-swellable rubber on the top are mostly used for waterproofing of segment joints. Its waterproof mechanism can be explained as follows: EPDM rubb...

AI Technical Summary

Problems solved by technology

[0005] 1. Uneven contact stress

[0006] 2. Partial fit is not tight, easy to warp

[0007] 3. Stress concentration occurs at the internal opening, which can easily lead to tearing and damage of EPDM rubber

[0008] 4. Under the action of long-term compressive stress, the gasket is prone to stress relaxation, and the rubber has insufficient ability to recover and deform after the hole collapses, thus reducing the waterproof ability of the gasket

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