Self-adhesive elastic sealing gasket and formed butt joint structure of shield segments

Abstract

The invention belongs to the technical field of waterproof materials, and particularly relates to a self-adhesive elastic sealing gasket and a formed butt joint structure for shield segments. A rubber matrix of the self-adhesive elastic sealing gasket is proportionally mixed with a mildew preventive through the mixed rubber matrix, so erosion resistance and aging resistance are improved; and the self-adhesive glue obtained through a formula consisting of modified SBS, modified SIS, a surfactant and tackifying resin does not contain volatile oil substances, so the durability of the bonding strength between the self-adhesive glue and the rubber matrix as well as concrete can be greatly improved, the solvent resistance, the aging resistance and the bonding performance between the self-adhesive glue and the rubber matrix as well as the concrete are improved, the self-adhesive glue is suitable for more complex environments, and the application range of the self-adhesive elastic sealing gasket is expanded. The butt joint structure arranged in the shield segments has the advantages of firm butt joint bonding performance, high sealing and water stopping performance, high durability and long service life.

Description

technical field [0001] The invention belongs to the technical field of waterproof materials, and in particular relates to a self-adhesive elastic sealing gasket and the butt joint structure of the formed shield segments. Background technique [0002] Rubber elastic gasket is the mainstream material used for sealing and waterproofing of shield tunnel segments. Through the combination of water-absorbing rubber and gasket, the waterproof performance of shield tunnel segment joints can be improved. Most of the existing elastic gaskets are processed from a single porous EPDM rubber, or a composite of porous EPDM rubber and expanded rubber. [0003] The current shield tunnels are usually constructed by ring splicing segments. Each ring is generally composed of 3 standard blocks, 2 adjacent blocks and 1 capping block. There are prefabricated grooves on the periphery of each segment. The ethylene-propylene elastic gasket is set in the prefabricated groove, and the waterproof functi...

AI Technical Summary

Problems solved by technology

[0003] The current shield tunnels are usually constructed by ring splicing segments. Each ring is generally composed of 3 standard blocks, 2 adjacent blocks and 1 capping block. There are prefabricated grooves on the periphery of each segment. The ethylene-propylene elastic gasket is set in the prefabricated groove, and the waterproof function is obtained by squeezing the elastic gasket attached to the two segments when the segment is assembled, but it is affected by factors such as the assembly force and the surface smoothness of the gasket. , Between adjacent segments and between EPDM elastic gaskets and segments, due to poor sealing, water leakage often occurs, and the sealing performance of the joints is greatly reduced; secondly, the rubber matrix of the gasket is in the long-term Under the conditions of extrusion and environmental erosion, the elastic capacity is weakened, mildew and damage occur. When the opening of the butt joint changes, the stress on the contact surface of the gasket changes significantly, resulting in a decrease in the strength of the butt joint structure of the shield segment and a shortened service life. , affecting the normal use of tunnel engineering

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