SLEEPER FOR THE TRACK SUPERSTRUCTURE

The invention relates to a sleeper for the track superstructure， which is produced in one piece from a plastic material， wherein the sleeper (1; 101) has an elongate basic shape with two end portions (2， 3; 102， 103) which are connected by a central portion (4; 104) of the sleeper (1; 101) and are held at a distance and wherein， on the top side (7; 107) thereof， a standing surface (112) is in each case provided for the rail (S1， S2) that is to be supported on the respective end portion (2， 3; 102， 103)， wherein a reinforcement (40; 140) is embedded in the central portion (4， 104)， which extends in the longitudinal direction (LR) of the sleeper (1; 101). In order to design a sleeper made of plastic material in such a manner that it has an optimized strength and can be reliably produced even with the use of inexpensive plastic-sand mixtures having a high sand fraction， the invention proposes that the reinforcement (40; 140) extends over the length of the central portion (4; 104)， that the reinforcement (40; 140) is anchored in each case in an edge region (45， 46; 145， 146)， which is associated with the central portion (4; 104)， of the end portions (2， 3; 102， 103) in the respective end portion (2， 3; 102， 103)， and that the reinforcement (40; 140) is fully or partially arranged in the upper quarter of the height (H) of the sleeper (1; 101). The invention relates to a sleeper for the track superstructure， which is produced in one piece from a plastic material， wherein the sleeper (1; 101) has an elongate basic shape with two end portions (2， 3; 102， 103) which are connected by a central portion (4; 104) of the sleeper (1; 101) and are held at a distance and wherein， on the top side (7; 107) thereof， a standing surface (112) is in each case provided for the rail (S1， S2) that is to be supported on the respective end portion (2， 3; 102， 103)， wherein a reinforcement (40; 140) is embedded in the central portion (4， 104)， which extends in the longitudinal direction (LR) of the sleeper (1; 101). In order to design a sleeper made of plastic material in such a manner that it has an optimized strength and can be reliably produced even with the use of inexpensive plastic-sand mixtures having a high sand fraction， the invention proposes that the reinforcement (40; 140) extends over the length of the central portion (4; 104)， that the reinforcement (40; 140) is anchored in each case in an edge region (45， 46; 145， 146)， which is associated with the central portion (4; 104)， of the end portions (2， 3; 102， 103) in the respective end portion (2， 3; 102， 103)， and that the reinforcement (40; 140) is fully or partially arranged in the upper quarter of the height (H) of the sleeper (1; 101).