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解放前,我国铁路桥梁类型繁杂,沒有统一的标准。据解放初期统计,铁路桥梁的跨度就有千余种,其中有公制的,如京汉、胶济等线,有英制的,如津浦、粵汉、京沪等线,还有俄文的,如长大、长滨、滨州等线。解放后,我国就着手制订铁路桥梁的跨度标准,并纳入1951年及1959年的《铁路桥涵设计规范》内。这对统一桥梁结构起了很大作用。但根据实践证明,现行的桥梁跨度还存在以下一些问题: 1.在跨度6.7米以下的桥梁,不是跨度尺寸零碎,就是全长尺寸零碎,不利于构件标准化。 2.计算跨度与全长的关系,沒有一定的规律性。
Before the liberation, China’s railway bridge complex types, there is no uniform standard. According to the statistics from the initial stage of liberation, there are over a thousand types of railway bridges spanning the span of the bridge, including the Jinghan and Jiaoji lines, and the British ones such as Jinpu, Yuehan and Beijing-Shanghai lines, as well as Russian, Such as growing up, long Bin, Binzhou and other lines. After the liberation, our country started to set the standard for the span of railway bridges and incorporated them into the “Code for Design of Railway Bridges and Culverts” in 1951 and 1959. This played a big role in unifying the bridge structure. However, according to practice, the following problems still exist in the span of existing bridges: 1. The bridges spanning less than 6.7 meters are not span-size systems or full-length systems and are not conducive to component standardization. 2. Calculation of the relationship between span and full length, there is no certain regularity.