Jordan River Bridge
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CASE STUDY ––––––––––––––––––––––––– JORDAN RIVER BRIDGE Brighton, TAS, Australia TerraClass® Abutment Owner: DIER Consultant: GHD Contractor: VTJV (VEC Civil Engineering-Thiess Joint Venture) Construction: May 2011 – July 2011 Background Challenge The Jordan River Bridge is a 300 m In 2008 the Jordan River Levee component of the northern section site was identified as having of the Brighton Bypass Project in potential for significant Aboriginal Tasmania. It enables the crossing heritage values. Investigation of the Jordan River and the findings confirmed that the site is associated levee deposit. the oldest known site in Tasmania The Brighton Bypass was the and is about 600 m long and about largest transport infrastructure 60 m wide. project ever conducted in Tasmania. It provides a bypass of As these indications became the towns of Brighton and Pontville, apparent, the Tasmanian approximately 70 km north of Department of Infrastructure, Hobart, and its purpose is to Energy and Resources (DIER) improve the efficiency and safety of responded by investigating ways to the Midland Highway. The ensure that historical artefacts and Midland Highway is Tasmania’s major north-south transport corridor the site itself would not be lost as a and provides a crucial freight result of the construction of the connection supporting the region’s bypass. To ensure the site was reliance on the northern ports. protected, the contractor, designer and DIER worked closely to modify The Brighton Bypass has delivered the bridge design accordingly. a new dual carriageway between the East Derwent Highway at DIER states in a fact sheet Bridgewater and the existing published in August 2010, that Midland Highway at a cost of $191 million. “NO artefacts contained within the important levee deposit will be The Reinforced Earth Company destroyed as a result of the Main Picture: Construction site. (RECO) was engaged by VEC Civil construction of the proposed Top: Lifting the first bridge girder into Engineering – Thiess Joint Venture bridge.” place from outside the Levee area. Above: Artefacts found on the Levee (VTJV) to provide abutment walls for the Jordan River crossing which site. Solution supports twin 166 m bridges. A short embankment, bridge These bridges incorporate a single abutments and multiple span span of 70 m, which is believed to bridge was constructed outside the be the longest single simply levee to complete the crossing. supported bridge span ever launched in Australia. Transport infrastructure Left Above: The wall needed to be adjusted during construction to accommodate 2 large culverts. A bridge design involving a 70 the completion of the backfill Project specifications metre bridge span was developed placement. The Reinforced to avoid permanent impacts on the Earth® wall was designed for a –––––––––––––––––––––––––––– levee deposit. The long bridge temporary bridge beam launching a System TerraClass® span was launched from above live load of 150 kPa acting at road –––––––––––––––––––––––––––– rather than lifted from below to level in response to this Finish Smooth, Grey further protect the area. The requirement. Reinforced Earth® bridge abutment –––––––––––––––––––––––––––– needed to be in place to allow the The Jordan River Bridge is a Structure Reinforced Earth® first girder of the long span to be significant component of the Abutment Wall launched from high above the Brighton Bypass and the planning –––––––––––––––––––––––––––– levee. The first girder was then and construction achieved a used to carry the remaining three successful result. The DIER, the Area 400m² girders across the levee. VTJV, and the designers at RECO –––––––––––––––––––––––––––– worked together to develop new Max. Height 7m It was necessary to operate a 100t and innovative techniques to crane to lift the girders into place. manage the strict limitations on –––––––––––––––––––––––––––– The crane was placed on top of the access to a heritage site. Length 72m Reinforced Earth® block prior to –––––––––––––––––––––––––––– Design load 25 kPa –––––––––––––––––––––––––––– Design life 100 years –––––––––––––––––––––––––––– Main Picture: Crane on top of the Reinforced Earth TerraClass® bridge abutment. Left: Cross-section of the Reinforced Earth® Block Reinforced Earth Pty Limited Reinforced Earth Limited Level 4, 20 George Street PO Box 72 734 Hornsby NSW 2077 Australia Papakura Auckland New Zealand Ph +61 2 9910 9910 Ph +64 9 236 3385 Fax +61 2 9910 9999 Fax +64 9 236 3385 www.reco.com.au www.reco.com.au .