High-elastic water-absorbing expansion sealing elastic strip

Abstract

The invention relates to a high-elastic water-absorbing expansion sealing elastic strip which includes an elastic base strip and a water-absorbing expansion strip. The elastic base strip is internallyprovided with a middle hollow hole and a corner hollow hole; the cross section of the middle hollow hole is an isosceles triangle, and the cross section of the corner hollow hole is a right angle orobtuse triangle; and the elastic base strip is a microsphere polymer rubber strip. T microsphere polymer rubber strip is used as the elastic base strip, plus the arrangement of the internal middle hollow hole, the corner hollow hole and a through slot, the compressibility of the sealing strip is improved, so the reserved amount of compression and the amount of rebound can be increased, sealing canfurther be carried out by rebounding when large opening amount of a connecting seam is generated between tunnel segments, and the problem that traditional rubber cannot play the role of elastic sealing due to decreasing of the elastic recovery ability and reducing of the sealing performance of a rubber strip caused by the relaxation of compressive stress is solved; and meanwhile, the stress of the sealing elastic strip is improved, so that the sealing elastic strip can be compressed and rebounded uniformly.

Description

technical field [0001] The invention belongs to the field of sealing rubber strips, in particular to a high-elastic water-absorbing and expanding sealing elastic strip. Background technique [0002] With the continuous improvement of the water-stop and waterproof sealing requirements of shield tunneling projects, a large number of rubber gaskets for shield tunnel segments are covered with water-absorbing rubber to meet the waterproof sealing requirements. That is to say, when there is a large amount of seam opening between the segments and the rubber rebound cannot completely stop the water (including the compression stress relaxation of the rubber gasket under long-term compression), the rubber gasket for the segment can also absorb water and generate volume. Swell to achieve the purpose of water stop. In this way, the rubber gasket for the segment has the dual effects of elastic compression and water-stopping and water-absorbing expansion, effectively ensuring the water-s...

AI Technical Summary

Problems solved by technology

But there is an important problem, that is, when there is a large amount of seam opening between the segments mentioned above, relying on the rebound of traditional rubber and the self-expansion of water-swellable rubber to ensure the sealing and achieve complete water-stop, How to better solve the problem of sealing; at the same time, traditional rubber will produce compressive stress relaxation under long-term compression, and due to the volume incompressibility of traditional rubber itself, the rubber strip will randomly bulge unevenly under pressure. Reduce the effective recovery amount of the rubber strip and affect the sealing performance

Images