Broadmeadow Bridge – Ireland. Push Launch – Bridge Construction – Also on the M1 Motorway in Ireland, this multi-span bridge was constructed over the Swords Estuary to the north of Dublin. Due to site conditions, the box girder bridge was constructed by the push-launch method, with the main structure being constructed incrementally on one side of the river, then jacked over the supporting piers. The complex formwork required was designed in collaboration with reinforcement and pre-stressing specialists, Freyssinet. The main contractors were an Ascon Nuttall joint venture.