Vibration isolating rubber mortar

A rubber and mortar technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems affecting train comfort, structural cracking, etc., and achieve good application prospects, reduce settlement, and reduce pollution.

Inactive Publication Date: 2012-10-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, ordinary mortar is used for shield tail grouting in the construction of subway tunnels, and its modulus is quite different from that of the soil. Therefore, during the operation of the subway, the soft soil foundation will have a large settlement, and the sandy soil foundation will liquefy, such as the Shanghai Metro Line 4 and the Nanjing Metro have similar situations. The light ones affect the comfort of the trains, and the severe ones cause the structure to crack, and they are forced to stop operation and carry out emergency repairs.
Therefore, it is essential to carry out vibration isolation to the subway. Although measures have been taken to install vibration damping devices between the tracks and the sleepers, it can only reduce the vibration by 50%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Changsha Yuefeng Rubber & Plastic Technology Co., Ltd. provided 50 parts of 20-mesh waste tire rubber (styrene-butadiene rubber) particles, 20 parts of 42.5-grade ordinary Portland cement, and 20 parts of river sand.

[0020] The raw material components are sampled according to the above mass ratio, placed in a mixer and stirred for 120 seconds, poured into a plastic volume and sealed.

[0021] Mix the above raw materials, add 20 parts of water, stir evenly, pour it into a 70.7mm×70.7mm×70.7mm mold, and after 28 days of curing at room temperature, do a vibration test, measure and draw the stress-strain curve, it is found that the rubber mortar is more than ordinary Mortar (mass ratio: 60 parts of sand, 30 parts of cement, and 20 parts of water) covers an area covered by the hysteresis curve by 40%, that is, its vibration isolation performance is increased by 40%.

Embodiment 2

[0023] Shaoyang Heibao Chemical Co., Ltd. produced 45 parts of 20-mesh waste tire rubber (butadiene rubber) particles, 25 parts of 42.5-grade ordinary Portland cement, and 25 parts of river sand.

[0024] The raw material components are sampled according to the above mass ratio, placed in a mixer and stirred for 120 seconds, poured into a plastic volume and sealed.

[0025] Mix the above raw materials, add 20 parts of water, stir evenly, pour it into a 70.7mm×70.7mm×70.7mm mold, and after curing at room temperature for 28 days, do a vibration test, measure and draw the stress-strain curve, it is found that the rubber mortar is more than ordinary Mortar (mass ratio: 50 parts of sand, 40 parts of cement, and 20 parts of water) covers an area of ​​36% larger in the hysteresis curve, that is, its vibration isolation performance is increased by 36%.

Embodiment 3

[0027] 50 parts of 30-mesh waste tire rubber (isoprene rubber) particles produced by Sinochem International Rubber Company, 15 parts of 42.5-grade ordinary Portland cement, and 15 parts of river sand.

[0028] The raw material components are sampled according to the above mass ratio, placed in a mixer and stirred for 120 seconds, poured into a plastic volume and sealed.

[0029] Mix the above raw materials, add 20 parts of water, stir evenly, pour it into a 70.7mm×70.7mm×70.7mm mold, and after curing at room temperature for 28 days, do a vibration test, measure and draw the stress-strain curve, it is found that the rubber mortar is more than ordinary Mortar (mass ratio: 50 parts of sand, 30 parts of cement, and 20 parts of water) covers an area covered by the hysteresis curve by 30%, that is, its vibration isolation performance is increased by 30%.

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Abstract

The invention provides a vibration isolating rubber mortar which is prepared from the following raw materials by mass: 20 to 50 parts of rubber, 15 to 30 parts of sand, 15 to 30 parts of cement and 15 to 30 parts of water, wherein the rubber is styrene-butadiene rubber, butadiene rubber or isoprene rubber and the cement is Portland cement. Beneficial effects of the invention are mainly as follows: 1) through addition of rubber particles in common mortar, the effect of vibration isolation in a subway tunnel is achieved on the premise that ground bearing capacity is not affected, and settlement of a soft soil foundation and influence on surrounding buildings and the life of residents is reduced; 2) utilization of waste tires enables treatment cost for the waste tires to be lowered down, pollution to the environment to be reduced and the waste to be changed into the valuable; and 3) with cooperation of the rubber mortar brought forward in the invention which has good buffer capability, a train is allowed to have an improved comfort level in running.

Description

(1) Technical field [0001] The invention relates to a vibration-isolation rubber mortar, in particular to a vibration-isolation rubber mortar used for shield tail grouting in subway tunnel construction. (2) Background technology [0002] At present, ordinary mortar is used for shield tail grouting in the construction of subway tunnels, and its modulus is quite different from that of the soil. Therefore, during the operation of the subway, the soft soil foundation will have a large settlement, and the sandy soil foundation will liquefy, such as the Shanghai Metro Line 4 and Nanjing Metro have a similar situation. The light ones affect the comfort of the trains, and the severe ones cause structural cracks, forcing them to stop operations and carry out emergency repairs. Therefore, it is essential to carry out vibration isolation to the subway. Although measures have been taken to install vibration damping devices between the tracks and the sleepers, it can only be reduced by 5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/22C04B111/52
CPCY02W30/91
Inventor 喻军
Owner ZHEJIANG UNIV OF TECH
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