高速用分岐器における軌道変位が分岐器部材の損傷に与える影響の検討

抄録

The maintenance standard values for track irregularity at high-speed type turnouts where trains pass through the main line of turnout at a speed of 120 km/h are managed with stricter values compared to general turnouts. The target track irregularities are longitudinal level irregularity, alignment irregularity, and cross level irregularity. The maintenance standard values for these irregularities of high-speed type turnouts are approximately half of those for general turnouts. This resulted in significant labor and maintenance costs. These values have been empirically determined from running tests conducted in the 1980s. However, since these values were determined empirically, the quantitative validity of these values has not been verified. Therefore, in order to optimize maintenance, it has been necessary to clarify the adequacy of standard maintenance values for track irregularity at high-speed type turnouts on the basis of quantitative technical evidence. This study developed a vehicle running simulation model on turnout using 3D dynamic finite element method (FEM) to quantitatively evaluate the effect of track irregularity on the damage to turnout components. Furthermore, using the developed simulation models, we carried out various studies on track irregularity. As a result, it was found that when alignment irregularity exceeds the current maintenance standard value, it has a significant impact on the damage to track and signal components. Therefore, it is desirable to manage alignment irregularity within the current maintenance standard value. On the other hand, it was found that longitudinal level and cross level irregularity have a small impact on the damage to these components, even when the track irregularities exceed the current maintenance standard value. From these results, it was clarified that the maintenance standard value for longitudinal level and cross level irregularity can be tolerated up to 23 mm, which is the same value as that for general turnouts.