Bridges: Irish bridges, Co. Meath and Dublin

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Bridges Bridges provide road and rail solutions work to be undertakenUsing steel allowed all from the riverbanks When it comes to building bridges two transportation projects in the Republic of Ireland have highlighted steel’s flexibility and ease of construction. Iroutes. By connecting the towns of spans are 2.2m deep. Butlers also fabricated, delivered and erectedAs well as completing Structure S19, SIACoutermost girders were site butt welded,”adds Mr Callanan.together on site before being lifted into place.Because of their extra length, the centralspan’s girders are 3.8m deep, while the outerreland’s recently opened M3 motorwayprovides a much needed improvementto one of the country’s busiest commuter Kells, Navan and Dunshaughlin to the M50 “Once the mid section was in place, the the 46 sign gantries along the M3 and toll Dublin ring road, the 66km-long highway outer spans were then lifted using a 400t booths at either end of the motorway. has alleviated town centre congestion, while capacity mobile crane,” adds Mr Callanan. Summing up the work, Pat Egan, SIAC simultaneously making the life of driving “As these spans were smaller, we were able Butlers’ Deputy Managing Director, says: commuters less stressful. to fabricate and deliver the girders to site in “Bridge projects will continue to be a key Just north of Dunshauglin the M3 crosses complete 37m lengths.” area of growth for the company in the future. the River Boyne, the widest obstacle along Aesthetics have played a key role in the As a fully certified member of the BCSA the highway’s route and one which required design of this structure, with landscaped RQSC Bridgeworks Scheme we’ve built up the largest structure. areas placed around the supporting piers a proven capability in the fabrication and A steel composite solution was chosen and the client specifying a brilliant blue installation of road and rail bridges.” for the bridge (known as S19) as this was polyurethane paint for the steelwork, which deemed the best way of avoiding any work was applied in SIAC Butlers’ fabrication "…we could lift fully assembled being undertaken in the river. facility. girders into place across the The bridge consists of three arched spans “Most of the connections on the bridge supported on concrete piers; two outer 37m are bolted, but for aesthetic reasons the river from the bank." spans and a central span of 56m. The middle FACT FILE section spans the River Boyne, while the Structure S19, M3 Motorway, County outer two allow local - predominantly farm Meath, Ireland vehicles - access along the riverbank. Main client: Steelwork contractor SIAC Butlers Steel National Roads fabricated and brought the bridge’s girders Authority to site in fully braced pairs. “This minimised Main contractor: the amount of on-site work needed,” explains M3 Motorway JV Tony Callanan, SIAC Butlers’ Construction Structural engineer: Director. “And also meant we could lift fully Roughan O’Donovan assembled girders into place across the river Steelwork contractor: from the bank.” SIAC Butlers Steel Initially the 56m-long central span was Steel tonnage: 650t erected with the aid of a 1,000t capacity crane positioned on the riverbank. These girders were too long to be transported by road as complete sections so they were delivered in two parts and then spliced The 56m long central span consists of twelve girders brought to site in six pairs 26 October 10NSC


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