Because many concrete bridges has been already started to corrode in the coastal area of Niigata prefecture, we tried to establish rational management system to minimize the maintenance cost. As a first step, we started to increase the number of well-trained engineers for the inspection of concrete bridges. As a second step, we developed web-database system which stores inspection data. Tablet PC was selected as input device. Through the trial test, we found that our system enables us to reduce

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... inspection cost significantly. As a third step, past data is collected and analyzed to achieve actual maintenance cost. Then, the life cycle cost of each repairing method is discussed.