Compound polyurethane sleeper pad and preparation method thereof

Abstract

The invention discloses a compound polyurethane sleeper pad and a preparation method thereof. The sleeper pad comprises a polyurethane foam layer; a plurality of reinforced fibers are embedded in thepolyurethane foam layer; and a non-woven cloth layer for preventing being pierced by ballast gravel is fixedly arranged on the bottom end face of the polyurethane foam layer. The preparation method comprises the steps that a non-woven cloth is laid on a plane worktable with side blocking parts; polyurethane composite materials and the reinforced fibers are evenly poured through a pouring machine with fiber cutting and adding functions, so that poured materials are formed; the poured materials are poured on the plane worktable with the laid non-woven cloth and naturally level; and meanwhile, afoaming reaction is conducted, a fiber compound polyurethane layer with a micropore structure is formed by solidifying, and the fiber compound polyurethane layer and the non-woven cloth on the bottomlayer are pasted closely to form a whole so as to form the compound polyurethane sleeper pad. According to the compound polyurethane sleeper pad and the preparation method thereof, the problem that the sleeper pad is pierced by the ballast gravel can be solved on the basis of solving the problem that the ballast gravel is pulverized quickly, thus the ballast gravel tamping period and the ballast bed hardening time are prolonged, and the railway maintenance cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of auxiliary parts for railway construction, in particular to a sleeper pad which is arranged between railway concrete sleepers and ballast gravel on a railway line and has a shock-absorbing effect and a preparation method thereof. Background technique [0002] Ballasted track refers to a track whose foundation is a stone granular ballast bed under the steel track. It is also usually called a gravel ballast bed track. It is one of the main forms of track structure. It has good flexibility, low price, convenient replacement and maintenance, and noise absorption characteristics. Good and other advantages, so it is more widely used. The ballasted track is mainly composed of steel rails, concrete sleepers and gravel track beds. The concrete sleepers are located above the gravel track beds, and the steel rails are perpendicular to the concrete sleepers above it. [0003] At present, most of the concrete sleepers of bal...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a composite polyurethane sleeper pad and its preparation method, which can effectively solve the problem that the sleeper pad is pierced by the ballast gravel on the basis of solving the problem of rapid pulverization of railway ballast gravel , use reinforcing fiber to reinforce polyurethane material to increase its cohesive strength, and solve the problem of low strength and easy crushing of traditional sleeper pads

Images