EAST KENT ACCESS ROAD PHASE 2, £70M, 147WEEKS, KENT COUNTY COUNCIL This project was to replace two key lengths of highway, the A299 and A256 through the provision of a new link between these two strategic highways. The works were across 4 active fronts along the new 8km route. Key features included taking the road in a 126m underpass beneath Foads Hill and the Network Rail railway at Cliffsend, and over the CTRL railway at Cottington Lane.
CLIFFSEND UNDERPASS - This 126m long jacked box underpass structure was our alternative to the original client designed RC structure. The benefits to were £2.5m cost saving and improved safety. We developed a system to jack twin 2.3m dia tunnels under the railway 6 metres below track level. Fromwithin these excavated tunnels piles were driven to form the foundation for the tunnel walls. The tunnels then formed the slide track structure for 5 cast tunnel roof slabs which were then jacked into position.
COTTINGTON ROAD BRIDGE - This is a 2-span concrete integral bridge over a Network Rail route that carries the CTRL local high speed train service. The RC structure was constructed on piled foundations behind a safety screen to address the soft ground conditions. The original design was 3 span, but we re-engineered it to a two-span structure with weathering steel beams. This reduced construction cost and also long term bridge maintenance.
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