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Colne Valley Viaduct - Case Study

The Colne Valley Viaduct is a railway bridge that will carry High Speed 2 over the Colne Valley Regional Park and the Grand Union Canal. It runs between Harefield in Hillingdon, Greater London and Denham in Buckinghamshire. At a length of 3.38 km (2.10 miles) and a weight of 116,000 tonnes, it is the longest railway bridge in the UK. It is one of the largest single civil engineering works of High Speed 2. Trains will travel at about 320 km/h (200 miles per hour) on the bridge. Kilnbridge were engaged to construct the foundations and 58 reinforced concrete piers for the iconic viaduct. The brief included producing high quality patterned concrete in a challenging location amongst highly sensitive natural habitats, and works included: Design development of the ‘V-pier’, a large mock-up of one of reinforced concrete piers which supports the viaduct Construction of individual pile cap bases, each up to 500m3 of concrete within cofferdams, associated pile cropping and capping beam construction Establishment and operation of a precast concrete facility nearby which is delivering over 775 precast concrete bridging planks, some weighing up to 21.6t and measuring up to 11m in length, with a total concrete volume in excess of several thousand cubic metres.