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解放前我国铁路桥梁采用钢桥较多,钢梁主要依赖国外进口,多控制在外国人手里。那时虽有一套桁梁标准设计,但其总体安排和细节布置均不符合近代制造的要求。解放后我国铁路基本建设发展很快,在铁路建设中标准设计起了很大的作用,除特大桥梁外,一般桥梁多采用标准设计。据统计解放后按标准设计制造的钢梁共30多万吨(包括援外)。一、钢梁标准设计发展的三个阶段
Before the liberation of China’s railway bridge with more steel bridges, steel beams mainly rely on foreign imports, and more control in the hands of foreigners. Although there was a standard design of truss beams at that time, its overall arrangement and details did not meet the requirements of modern manufacturing. After the liberation of China’s rapid development of railway infrastructure, standard design in railway construction played a significant role, in addition to extra large bridges, the general use of standard bridge design. According to statistics, after liberation, more than 300,000 tons of steel beams (including foreign aid) were designed and manufactured according to the standard. First, the standard design and development of steel beams in three stages