Patent ID: 6070806
Filing Date: 2000-06-06
Classification: E01B

Abstract:
A sleeper comprising:a body having a length, width and height, wherein at least said height is substantially less than said length and has a variable value along said length of said body of the sleeper, an upper face determined by said width and said length of said body of the sleeper, a lower face opposite said upper face, and also a first end part, a middle part and a second end part which are positioned successively along said length of said sleeper;said body being made of reinforced polymer concrete including therein at least one polymer capable of hardening, an appropriate hardener and aggregate, with dispersed reinforcement with fibres, which fibres are selected from a group consisting of steel fibres, synthetic fibres, steel and synthetic fibres, wherein said fibres constitute 5-7% of the total mass of said body of said sleeper;at least two inserts mounted in said body of the sleeper at predetermined points of fastening rails, said inserts being made each of a material, the modulus of elasticity of which is less than the modulus of elasticity of the material of said body of the sleeper, and each insert having a height, width, length which are oriented respectively in the directions of said height, width and length of said body of the sleeper, the lower face interacting with said body of the sleeper, and serving for interaction with said rail;said height of said insert being selected, taking into account fulfillment of the relationship:2/3H.sub.1 .gtoreq.H.sub.2 >1/3H.sub.1,whereH.sub.1 is said height of the body of the sleeper at each end of the body of the sleeper,H.sub.2 is said height of the insert;said upper face of said middle part of said body being positioned higher than said lower face of said inserts by a value which satisfies the relationship:0.5(H.sub.1 -H.sub.2)>.DELTA.H>0.1(H.sub.1 -H.sub.2),where.DELTA.H is the distance in height between the upper face of the middle part of the body and the lower face of the insert.