Unsupported Sleepers in Transition Zone between Concrete Slab Track and Ballasted Track : Phenomena and Its Countermeasures

고속철도 콘크리트궤도-자갈도상궤도 완충구간의 뜬침목 발생 현상과 대책

In 1st Phase Kyeong-Bu High-Speed Line, to lessen the impact in the transition zone between concrete slab track(in tunnel) and ballasted track(on embankment), the ballast bonding method has been adopted. However, in this area, in the beginning of the operation, unsupported sleepers are found, and the track deterioration and damage of concrete sleepers have occurred. In this paper, the status and causes of unsupported sleepers are discussed and several repair measures are proposed.