A20 Roundhill Viaducts, Folkstone, UK

Synopsis:
Design of superstructure, substructure and redetailing of abutments
Design and detailing of temporary works for construction
Production of alignment control software and geometry data
Contractor:
Birse Construction
End Client:
Department of Transport

An alternative design of two viaducts built using the glued segmental balanced cantilever system. The individual viaduct lengths of 340.2 m and 384.08 m are made up of spans typically of 60 and 63 m.

The viaducts form part of the road improvements for the A20 Folkestone to Dover route. In addition a complete redesign of the supporting columns and foundation was also undertaken, taking into consideration the Channel Tunnel which crosses the site within 1 m of finished ground level.

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A20 Roundhill Viaducts