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

A technology of elastic sealing gasket and shield segment, applied in the direction of adhesive, adhesive type, oil/grease/wax adhesive, etc., can solve problems such as affecting the normal use of tunnel engineering, leakage of water, shortening of service life, etc.

Pending Publication Date: 2021-04-20
HENGSHUI ZHONGTIEJIAN ENG RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 elasti

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Reactor temperature rises to 170 ℃, with 22 parts by weight of modified thermoplastic elastomer SBS, 22 parts by weight of modified thermoplastic elastomer SIS, 11 parts by weight of plasticizer naphthenic oil, 44 parts by weight of C5 hydrogenated petroleum resin, 0.3 parts by weight 3 parts by weight of organic ultraviolet absorber UV-531 and 3 parts by weight of inorganic anti-ultraviolet agent rutile titanium dioxide, 3 parts by weight of polyisobutylene-maleic anhydride copolymer are added to the reactor, and the reactor speed is 45 rpm, and Fill with nitrogen protection, stir for 220 minutes, discharge the self-adhesive, cool, and pack for use.

[0048] Mix 60 parts by weight of natural rubber with 40 parts by weight of butadiene rubber in an internal mixer, then add 4 parts of zinc oxide, 2 parts of stearic acid, 2 parts of antioxidant RD, and 0.3 parts of rubber antifungal agent OBPA After mixing for 40 seconds, add 40 parts of reinforcing agent N330, 5 parts of...

Embodiment 2

[0051] Reactor temperature rises to 180 ℃, with 24 parts by weight of modified thermoplastic elastomer SBS, 24 parts by weight of modified thermoplastic elastomer SIS, 13 parts by weight of plasticizer naphthenic oil, 46 parts by weight of C5 hydrogenated petroleum resin, 0.4 parts by weight Part organic ultraviolet absorber UV-531 and 4 parts by weight of inorganic anti-ultraviolet agent rutile type titanium dioxide, 4 parts by weight of polyisobutylene-maleic anhydride copolymer are added in the reactor, the rotating speed is 60 rev / min, and nitrogen gas Protect, stir for 240 minutes, discharge the self-adhesive, cool, and pack for use.

[0052] In the internal mixer, 70 parts of natural rubber was masticated and mixed with 30 parts by weight of styrene-butadiene rubber, and then 5 parts by weight of zinc oxide, 3 parts by weight of stearic acid, 2.5 parts of anti-aging agent 4010NA, 0.4 parts by weight of rubber anti-aging agent were added. Mold agent pentachlorophenol, aft...

Embodiment 3

[0055] Reactor temperature rises to 180 ℃, with 25 parts by weight of modified SBS, 25 parts by weight of modified SIS, 15 parts by weight of plasticizer naphthenic oil, 50 parts by weight of C5 hydrogenated petroleum resin, 0.5 parts by weight of organic ultraviolet absorber Add UV-531, 4 parts by weight of inorganic anti-ultraviolet agent rutile titanium dioxide, and 5 parts by weight of silane coupling agent into the reaction kettle at a speed of 55 rpm, and fill it with nitrogen protection, stir for 260 minutes, and put the self-adhesive Drain, cool, and pack for use.

[0056] In the internal mixer, 75 parts by weight of natural rubber was masticated and mixed with 25 parts of butadiene rubber, and then 5 parts by weight of zinc oxide, 2.5 parts by weight of stearic acid, 3 parts by weight of antioxidant 4010NA, and 0.6 parts by weight of rubber Antifungal agent 8-hydroxyquinolinone, after mixing for 35 seconds, add 50 parts by weight of reinforcing agent N550, 8 parts by ...

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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...

Claims

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Application Information

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IPC IPC(8): C09J7/20C09J7/30C09J157/02C09J153/02C09J191/00C09J11/04C09J11/06C09J11/08C08L7/00C08L9/00C08K13/06C08K9/00C08K3/22C08K5/09C08K3/04C08K3/34E21D11/08E21D11/38
Inventor 郭勇李朋郑永春贾雷雷赵晓燕赵荣李玉飞田月华李登培王磊磊贾峰伟
Owner HENGSHUI ZHONGTIEJIAN ENG RUBBER
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