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Abstract: Tokyo Metro Co., Ltd. operates 9 lines, 195.1km of total length, in Tokyo. 7.24 million passenger use our lines every day in last year. It is the traffic artery in the capital city of Japan. About 85% of the total length, 166.7km, is composed of tunnel. In these tunnel, there is a place which is particularly caused deterioration due to chloride attack under tidal rivers. In order to examine...