抄録
In general, "derailment coefficient (Q/P)" was measured by the instrumented wheel sets, named "PQ wheel sets", as an index of running safety. From the view point of safety assessment, the derailment coefficient should be measured every day, but it is impossible to do so due to some technical problems of PQ wheel sets (for reasons including strength and durability). In order to solve the problem of PQ wheel sets. Tokyo Metro introduced PQ monitoring bogies equipped with non-contact gap sensors into commercial lines from 2009 instead of PQ wheel sets, which enables continuous measurement of derailment coefficients during service operations. They were introduced into Marunouchi Line for the first time and into Tozai Line and Chiyoda Line after that. As one of the advantages of continuous measuring of derailment coefficients on commercial lines, all curves data on these commercial lines can be obtained every day. An enormous volume of measured data has been accumulated, and methods of application have been considered for these data. In this paper, examples for application methods of accumulated data which are measured by PQ monitoring bogies are mentioned. That is, discussions are included for positional changes along a curve and daily and monthly changes in a maximum and/or a mean value of derailment coefficients.
