Comparative Study on the Reduction Strategies of the Track irregularity in the bridge expansion joint zone

초록

In general, the track irregularity on the railway bridge occurs at the expansion joint zone and then the widespread irregularity is detected across the bridge. This is because that due to the dynamic impact of the running train and the thermal expansion of the bridge deck, the noticeable local loosening of the ballast gravel arises in the expansion joint zone. Therefore, the reduction strategies of the track irregularity in the bridge expansion joint zone are an important issue in the ballasted track on the high speed railway bridge. In this study, some of the strategies that reduce the track irregularity are introduced and investigated about the application and efficiency. Field testing of the three reduction methods such as the zero longitudinal restraint (ZLR), tied sleepers, and ballast stabilizer is conducted and then the intensity of the maintenance work and the progress of the track irregularity are evaluated.