A PROPOSAL OF EFFECTIVE REPAIR METHOD CONSIDERING REPAIR RATIO IN TUNNEL LIGHTING FACILITIES

Abstract

 Recently, an asset management system is an effective tool for maintaining to civil infrastructure. Asset management is established for a purpose of preventive maintenance composed of PDCA (Plan-Do-Check-Action) cycle. In Plan step, a plan of replace and repair is made from based on past inspection results. In Do step, the current state is evaluated from the inspection and repair performed to the infrastructure. In Check step, it analyzes the difference of state between initial predicted and current for investigating the cause. In Action step, re-plan is made from correcting to the cause. The preventive repair in the Do step has a role of significant for extending the life of the infrastructures.

 In this study, a simple repair is introduced to the observation state corresponding to not need repair for preventive management in tunnel lighting facilities. Then, it estimates future prediction deterioration and repair costs to a ratio for repair amounts of observation state. It is decided the optimum repair ratio on indicator of balance for deterioration and repair costs from these results.

 This paper is formulated the concrete methods. Firstly, health degree for deterioration indicator expressed as a numerical value from 0 to 100 is calculated by not micro model for each tunnel lighting facility but macro model for an aggregation of facilities in unit of a tunnel tube. Then, it is calculated the health degree and the repair costs corresponding to repair ratio by simplified dynamic macro model which proposed by authors in past. It is proposed the optimum repair ratio by the cost effectiveness of indicator for balance health degree and repair cost. Finally, it is explained validity and problem for performance having this model.