Abstract
Permanent highway structures are generally not designed to be moved at a later date. The new Upton upon Severn viaduct in Worcestershire, UK is an exception—at some point in the future its 170 m long 10-span deck will be jacked up to clear the flood waters which currently inundate it every five years or so. Carrying the A4104 highway over the notorious River Severn floodplain, it replaces a 1939 reinforced-concrete viaduct that had started to suffer severe structural decay due to poor design and ingress of de-icing salts. The urgency of its replacement meant there was insufficient time for a wholesale elevation of the roadway, so the new structure is designed both for inundation conditions as well as to be raised in future. Composite ‘filler beam’ construction and precast component were used to produce a slender, monolithic deck with minimum impedance to flood flows as well as to reduce the risk of flood delays. This paper describes the design and construction of this unusual, future-proofed, award-winning project.
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