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在运营铁路线上尚存许多早期修建的桥梁。随着列车载重的不断增长和行车速度的不断提高,这些桥梁愈来愈显得不能适应运输发展的需要。因此,旧桥改建在铁路工务部门每年进行的桥梁大修工作中占有很大的比重。 在旧桥改建工程中,桥梁的上部建筑——一般为跨度小于16m的钢梁,可以通过检算后采用相同跨度的低高度钢筋混凝土梁来替换。
There are still many early bridges built on the operating railway line. With the continuous increase of train load and continuous increase of traffic speed, these bridges are increasingly unable to meet the needs of transport development. Therefore, the reconstruction of the old bridge accounts for a large proportion of the annual work of overhauling bridges in the railway construction department. In the old bridge reconstruction project, the superstructure of the bridge, usually a steel beam less than 16m in span, can be replaced by a low-height reinforced concrete beam of the same span after examination.