도시철도 레일 유지관리 최적화 방안

초록

The rail maintenance cost is biggest in managing railway facilities. However, little effort has been made with regard to the systematic analysis about this. The advanced data analysis in direct relation to the optimal maintenance strategies is adopted and applied to Seoul metro. It consists of two models such as the defect model and the life-cycle model. Although the life cycle of the rail has been extended practically thanks to the enhancement of rail material, Seoul metro is still using the outdated renewal standard. Thus, Seoul metro is searching for a new renewal standard, and this study provides it. As a result, the economical life span (=renewal interval) of the rail facility was found to be 616 million passing tons. To a certain extent, this is consistent with the existing standard (600 million tons) adopted in Seoul metro. On the other hand, there was a small difference (less than 1%) between the minimum life-cycle cost at 616 million passing tons and the life-cycle cost at 700 million tons. The result provides the rationale for increasing the standard up to 700 million tons, as agencies responsible for operating the Seoul metro have continuously claimed the amendment. The optimal inspection interval was also determined to be 4.2 million passing tons.

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