Bridge Street overbridge next to Newport station in south Wales was replaced to enable electrification of the Great Western main line railway between London and Cardiff. The former 120-year-old steel truss bridge was too low and in poor condition, so a half-through weathering steel–concrete composite bridge deck with a smaller structural depth was lifted onto the existing abutments. The new bridge requires minimal maintenance, reducing overhead-line hazards and whole-life costs. This paper describes the key considerations and challenges associated with the strengthening and removal of the existing superstructure, the modifications that were required to the original abutments, and the design and construction of the new superstructure.

中文翻译：

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英国大西部电气化计划：桥街天桥改造

南威尔士纽波特车站旁的桥街天桥被更换，以使伦敦和加的夫之间的大西部干线铁路电气化。曾经有120年历史的钢桁架桥太低且状况不佳，因此将结构深度较小的半透风化钢-混凝土复合桥面板提升到现有的桥台上。新桥需要最少的维护，从而减少了架空线的危害和整个生命周期的成本。本文介绍了与加固和拆除现有上部结构，对原始基台进行的修改以及新上部结构的设计和建造相关的主要考虑因素和挑战。