A20 Roundhill Viaducts, Folkstone, UK

Design of superstructure, substructure and redetailing of abutments
Design and detailing of temporary works for construction
Production of alignment control software and geometry data
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