Cause and Modification Measures of Longitudinal Cracks from Bolt Hole of the PC Sleepers II

Sleepers, a main element of the railway track, which bear the load transmitted by rail and ensure the track's geometry and integrity, have a great impact on the smooth and safe passage of the vehicle. In recent years, the continuous increase in speed and loading have caused rising damages of PC sleepers. In particular, the longitudinal crack originating from the bolt-hole of PC sleeper II is the most serious one and has influenced the stability and safety of the track to a great extent. This paper analyzes the cause of longitudinal cracks originating from the sleeper's bolt-hole and puts forward measures for modification with regard to special concrete in the area around the bolt-hole.