目前,日本铁路运营线上约有13.2万个桥墩和桥台。其中约11万个占总数的83％是砖砌、石砌或素混凝土墩台,用砖或石头砌筑的墩台约3.2万个,占总数的24％,这些砖、石墩台大都建造于明治、大正年间和昭和初期,70％墩台已使用40年以上。砖砌、石砌墩台中的90％则已使用60年以上。这些陈旧的墩台有 At present, there are about 132,000 piers and abutments on the Japanese railway line. Of these, about 110,000 account for 83% of the total number of piers being masonry, masonry or plain concrete. About 32,000 piers are brick or stone masonry, accounting for 24% of the total. These masonry and stone piers are mostly built In the Meiji Period, Taisho Period and the early Showa period, 70% of piers have been used for more than 40 years. 90% of brickwork and stone pier have been used for more than 60 years. These old piers have