Polyurethane patching material used for settlement repairing of ballastless track structure for high-speed railway

A ballastless track and repair material technology, applied in the field of polyurethane foam, can solve the problems of heavy equipment weight, uncontrollable line shape, and difficult construction on the track, and achieve high dimensional stability, fast strength development speed, and durability Effect

Active Publication Date: 2015-06-10
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this technology is carried out at the level of the track structure, it can avoid the traditional grouting (rotary spraying, powder spraying, etc.) t

Method used

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  • Polyurethane patching material used for settlement repairing of ballastless track structure for high-speed railway
  • Polyurethane patching material used for settlement repairing of ballastless track structure for high-speed railway
  • Polyurethane patching material used for settlement repairing of ballastless track structure for high-speed railway

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0022] Specific embodiment 1 is as shown in table 1.

[0023] Table 1 Specific embodiment 1

[0024]

[0025] Note: Mw in the table represents the average molecular weight of the compound.

[0026] Use a high-pressure foaming agent to mix components A and B through high-pressure collision and inject them into a steel round mold with a cover on the top and the cover can move upward freely. The amount of polyurethane slurry injected is 1 / 4 of the volume of the round mold, with a cover The round mold is placed between the upper and lower pressure plates of the electronic universal testing machine, and the electronic universal testing machine is used to test the expansion force of the material after grouting. In the anti-fatigue performance test, the maximum load is 0.3MPa, the minimum load is 0.03MPa, and the loading frequency is 5HZ. Use a vernier caliper to measure the thickness of the sample before and after loading, and calculate the accumulated residual deformation after...

specific Embodiment 2

[0030] Specific embodiment 2 is as shown in table 3.

[0031] Table 3 Specific embodiment 2

[0032]

[0033] Note: Mw in the table represents the average molecular weight of the compound.

[0034] Specific embodiment 2 test method is identical with the test method of embodiment 1, and implementation effect is shown in Table 4.

[0035] Table 4 The performance of the polyurethane repair material produced according to specific embodiment 2

[0036] serial number

specific Embodiment 3

[0038] Specific embodiment 3 is as shown in table 5.

[0039] Table 5 Specific embodiment 3

[0040]

[0041]

[0042] Note: Mw in the table represents the average molecular weight of the compound.

[0043] Test method is identical with the test method of embodiment 1, and implementation effect is shown in Table 6.

[0044] Table 6 is according to the performance of the polyurethane repairing material that concrete embodiment 3 produces

[0045] serial number

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Abstract

The invention relates to a polyurethane patching material used for settlement repairing of a ballastless structure for a high-speed railway. The polyurethane patching material is formed by hybrid reaction of an A component material and a B component material by a high-pressure impact. The volume ratio of the A component and the B component is 1:1-1:1.8. The A component is a mixture formed by polyhydric alcohol modified diphenylmethane diisocyanate and multi-methylene multi-phenyl isocyanate. The viscosity of the A component ranges from 100 mPa.s to 200 mPa.s at the 25 DEG C temperature. The B component is a mixture formed by polyhydric alcohol, a coupling agent, a hydrolytic stabilizing agent, a cross-linking agent, a foam stabilizing agent, a catalyst agent and a foaming agent. The viscosity of the B component ranges from 150 mPa.s to 300 mPa.s at the 25 DEG C temperature. The B component is characterized in that at least a part of end amido polyolefin polyhydric alcohol with 8 functionalities is in the polyhydric alcohol, and the content of the end amido ranges from 60%-80%. According to the polyurethane repairing material, the chemical reaction speed is high, the expansibility is high, the mechanical strength is high, the binding power is high, the size stability is high, the anti-hydrolysising property is good, and the deformation of accumulated residues is low. The polyurethane repairing material can be used for the settlement repairing of the ballastless structure for the high-speed railway, and can also be used for the pavement structure repairing of an expressway and the settlement repairing of an industrial building terrace.

Description

technical field [0001] The invention relates to a polyurethane repair material for settlement repair of ballastless track structures of high-speed railways, and is also suitable for settlement repair of structures such as expressway concrete pavements and concrete floors in workshops, and belongs to the technical field of polyurethane foam. Background technique [0002] With the rapid development of my country's society and economy, people's requirements for travel are getting higher and higher. Fast, safe and comfortable high-speed railways are the main direction for the development of passenger railways in my country. The soon-to-be-built four-vertical and four-horizontal high-speed railway network will also Greatly improve people's travel conditions. Usually, most high-speed railway lines adopt ballastless track structure, and the design idea of ​​"replacing roads with bridges" is widely used, which ensures the stability of the line to a certain extent and ensures the high...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/62C08G18/32C08J9/14C08J9/08
CPCC08G18/6688C08G18/7664C08G18/7843C08G2101/00C08J9/08C08J9/145C08J2203/02C08J2203/142C08J2203/184C08J2375/08
Inventor 郑新国李书明谢永江曾志刘竞翁智财杨德军朱长华王月华刘相会
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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