The Structural Engineer > Archive > Volume 89 (2011) > Issues > Issue 17 > Newmarket Viaduct deconstruction
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Newmarket Viaduct deconstruction

The Newmarket Viaduct was completed in 1966 and has played a vital role in the Auckland motorway network for the last 45 years. The viaduct carries more than 160 000 vehicles per day over several key arterial roads and the North Auckland railway line. The structure comprises two parallel, balanced cantilever bridges connected at each pier with a post-tensioned portal frame. Increased traffic volumes and the limitations of the live load, differential temperature and seismic performance of the structure created the need to replace the old six lane viaduct. This paper describes how the viaduct is being replaced in stages while keeping the motorway operational throughout. Implemented under an alliance framework, the benefits of the integrated client, design and construction team are discussed. The complex and unprecedented challenges of deconstructing this post tensioned viaduct in stages whilst it remains in service are described in detail. Jon Varndell, BEng (Hons), CEng, MICE Design Manager – NGA Newmarket Alliance, URS – Principal Engineer Peter Lipscombe, NZCE, BE (Hons), PhD, MIPENZ, CPEng Structure Design Manager – NGA Newmarket Alliance, URS – Principal Engineer Ian Billings, BE (Hons), FIPENZ, CPEng Senior Bridge Advisor – NGA Newmarket Alliance, Beca – Technical Director