Upper Harbour Bridge

Upper Harbour Bridge

The Upper Harbour Bridge is a motorway bridge (technically two bridges as of 2006), which spans over a reach of the Waitemata Harbour and connects Hobsonville (in Waitakere City) and Greenhithe (in North Shore City), New Zealand. It is also an important connection for State Highway 18, which will become even more important once the Western Ring Route is finished (likely to be in the next decade).

History

The original bridge was built in the 1970s. This proved insufficient for modern traffic demands of over 27,000 vehicles per day [ [http://www.beehive.govt.nz/ViewDocument.aspx?DocumentID=16032 Work on Upper Harbour Corridor Begins] (official website of the Parliament of New Zealand)] (soon to be up to 35,000 vehicles per day with the completition of the motorway works) and a duplicate bridge was constructed next to it. The new bridge was designed and engineered by Beca, and built between 2005-2006 by Fletcher Construction using self-compacting concrete. [ [http://www.concretesociety.org.nz/files/generic-scc.asp?PageID=206&PageSubID=966 Upper Harbour Bridge datasheet] (from the New Zealand Concrete Society website)] The new bridge cost NZ$ 35 million and provides a 524 m long, 16.5m wide, 10-span crossing. This was designed to match the existing 457 m long existing 7-span cantilever bridge aesthetically. [ [http://www.fcc.co.nz/project/57 Upper Harbour duplicate bridge] (from the Fletcher Construction website)]

Both bridges together provide three lanes towards Greenhithe (an uphill gradient) and two lanes downhill. Prior to the first stage of the Upper Harbour Motorway opening, Transit NZ closed off the old bridge to make repairs, especially to reduce a sagging effect due to old tensioning cables. [ [http://subs.nzherald.co.nz/column/story.cfm?c_id=800&objectid=10385165 'Get Moving' column] - "The New Zealand Herald", Tuesday 06 June 2006] With the opening of the motorway on December 6, 2007 all bridge lanes are now open." [http://www.transit.govt.nz/news/MediaReleaseView.do?MediaReleaseId=nz.govt.transit.transweb.content.news.MediaRelease-12703 New SH18 Greenhithe motorway opens up growth opportunities] " - Transit New Zealand, Media Release, Thursday 06 December 2007. Accessed 2008-01-16.] , The new bridge also provides a cycle-way and walkway on the north side. [ [http://www.beehive.govt.nz/ViewDocument.aspx?DocumentID=16032 Work on Upper Harbour Corridor Begins] (official website of the Parliament of New Zealand)]

The bridge project, together with the causeway widening, has received a Silver Award from the Association of Consulting Engineers New Zealand."Upper Harbour Bridge Duplication & Causeway Widening" - "Innovate NZ", Brochure of the '2007 ACENZ Awards of Excellence', Page 19]

References


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