Title: Sheahan Bridge Duplication

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Publication: CIA

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Date: 2/28/2011

Abstract:
At 1146m total length, the Sheahan Bridge over the Murrumbidgee River in Gundagai is currently the longest bridge under construction in NSW. The bridge superstructure comprises two main construction techniques; traditional Balanced Cantilever Box Girder over the Murrumbidgee River (3 spans) and precast Bulb T girders over the floodplain (24 spans). The Balanced Cantilever is a Joint Venture between Austress Freyssinet and Fulton Hogan and consists of 3 spans of 53m, 87m and 53m. The depth of the box girder varies between 2.4m midspan and 5m over the piers. The travelling formwork for the box girder was constructed using an NRS form traveller recycled from two previous uses; firstly on Crni Kal Bridge in Slovenia, and secondly on Lawrence Hargrave Drive ‘sea cliff bridge’ in Australia. The Floodplain Bridge consists of 24no 39.65m spans of 4 adjacent Bulb T Girders supported on Reinforced Concrete Headstocks, Blade Piers and Pilecaps supported on 1200mm dia Steel Lined Bored Concrete Piles.