Abstract
This paper describes the design and construction of the foundations for the second motorway bridge over the Severn estuary between England and Wales. The two main piers of the central cable-stayed bridge and the 49 supports of the approach viaducts are founded mostly on exposed sandstone and mudrock. Owing to strong currents and the high tidal range, the contractor chose to construct 37 of the foundations using precast caissons weighing up to 2000 t. These were floated out from the casting yard on the English shore and placed using specially adapted barges. The remaining foundations were piled through alluvium or to span an existing rail tunnel. All foundations were designed for potential ship impacts. (A) For the covering abstract see IRRD 896358.
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