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日本铁路进行预应力混凝土 (ＰＣ)研究 ,是从 1 948年试制ＰＣ轨枕正式开始的。ＰＣ的发展历史迄今可分为以下几个阶段 :①ＰＣ的初期 (昭和 2 0～ 3 0年代 ) :1 954年建成第一座ＰＣ铁路桥 (信乐线第一大户川桥 ,跨度 3 0ｍ ,后张法
The prestressed concrete (PC) research conducted by the Japan Railways officially started from the trial manufacture of PC sleepers in 1948. The history of PC development has so far been divided into the following stages: (1) In the early period of the PC (2030-1900): The first PC railway bridge was built in 1954 (the largest Tochigi-bridge in Shinsegae Line with a span of 300m, Post-Zhang method