High-speed railway ballast track ballast bed surface cementing material

Abstract

Provided is a high-speed railway ballast track ballast bed surface cementing material. The high-speed railway ballast track ballast bed surface cementing material is characterized in that a compound is composed of A and B; the A is prepared from, by mass, 100 parts of isocyanate and prepolymer thereof, 10-30 parts of an environment-friendly plasticizer and 2-6 parts of a bonding accelerator; the B is prepared from, by mass, 100 parts of polyether polyol, 30-60 parts of a chain extension cross-linking agent, 10-30 parts of an environment-friendly plasticizer, 1-3 parts of defoamer and 2-5 parts of an antiager; the volume ratio of the A to the B is 1:0.5-1:4. The ballast track ballast bed surface cementing material is proper in viscosity and curing speed, moderate in curing speed, bonding strength and flexibility, excellent in ageing resistance and low in sensitivity to air humidity, certain dirt resistance is achieved, the effect of inhibiting railway ballast splashing is obvious, and normal ballast track ballast bed tamping maintenance operation is not affected.

Description

technical field [0001] The invention relates to a cementing material on the surface of a ballasted track bed of a high-speed railway. Background technique [0002] The ballasted track bed can provide good track elasticity, slow down and absorb wheel-rail impact and vibration, and facilitate maintenance and repair. However, when the speed of the high-speed train exceeds 300km / h, the train wind speed formed on the surface of the ballast bed can reach more than 50m / s, and the light and flat ballast is prone to splash, which poses a hazard to the safety of train operation. In order to improve the safety of trains, ballast glue is often used to consolidate the ballast track bed to prevent ballast from splashing. Ballast structure cementing materials mainly include flexible ballast cementing materials and rigid ballast cementing materials. The flexible ballast cementing material is foamed polyurethane material, which can increase the integrity and stability of the ballast track ...

AI Technical Summary

Problems solved by technology

However, polyurethane ballast adhesives are more sensitive to the construction environment, such as foaming on the ballast surface or high air humidity, resulting in reduced material performance, etc.

Moreover, polyurethane ballast glue has high requirements on ballast cleanliness, but there are many impurities such as dust and stone powder on the surface of the ballast track bed in the operation line, and the bonding firmness between ballasts after spraying ballast glue cannot be guaranteed

At the same time, the early strength of the ballast glue is low, and the cementing effect is easily damaged by people stepping on it after spraying. Moreover, the ballast track bed road of the operating line is opened to traffic after the ballast glue is sprayed and the ballast glue is applied in the "skylight period". There is a risk of ballast splashing. risk

In addition, the ballast cemented by polyurethane ballast glue is difficult to maintain and clean, and cannot be maintained

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