Engineers in Northern Ireland push the limits of pre-fab construction, building the world's longest flat-pack bridge using precast concrete. According to

Based on the ‘FlexiArch’ system, the bridge is unique in that it will be transported to site in flat-pack form but when lifted, will transform under gravity into an arch.

The bridge is due to be installed near Portsmouth in coming months and will span 16 metres (53 feet) over the Wallington River in Waterlooville, Hampshire. Made up of 17 units (1m wide) of pre-cast concrete, each weighing 16 tons, the bridge will take less than a day to install using a 200-300 ton crane in association with a lifting beam also designed and built in Northern Ireland.

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