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1987年4月日本铁路由国营改为私营。本文介绍了在此变革前10年日本铁路钢桥的发展概况。 1.设计和施工标准、维修管理体系 1983年对1970年版的铁路钢桥没计规范进行了修改,主要修改内容有:①考虑到制造精度和产品质量的提高,将SM41～SM53钢材的抗拉、抗压安全系数
In April 1987, the Japanese railway was changed from state-owned to private. This article presents an overview of the development of the Japanese railway bridge in the 10 years prior to this change. 1. Design and construction standards and maintenance management system In 1983, the norms of railway steel bridge in 1970 edition were revised. The main revisions include: ① Considering the improvement of manufacturing precision and product quality, the tensile strength of SM41 ~ SM53 steel , Compression safety factor