Bridges

Cover of The Newmarket Viaduct Replacement Project Experience
The Newmarket Viaduct Replacement Project Experience
  • Publication no: ABC-CAS101-14
  • Published: 22 October 2014
Between 2008 and 2012, the Newmarket Viaduct replacement project was New Zealand’s premier bridge project. The existing Newmarket Viaduct was well known for its structural deficiencies, notably its inadequate capacity to resist heavy live loads, differential temperature effects and seismic loading. The original viaduct had previously twice been strengthened to increase load carrying capacity. Ultimately however, increasing traffic volumes meant that an additional southbound lane was required immediately with provision for a future additional northbound lane, leading to the decision to replace the structure.This project has been recognised worldwide as being extremely technical and complex. The challenge of constructing a new viaduct while deconstructing the existing viaduct in stages was a world first. The Newmarket Viaduct project won at the 2012 World Demolitions Awards and was also awarded a Merit at the FIDIC Awards which celebrated the best engineering achievements globally in the last century. The Newmarket Viaduct project has featured twice in the World Highways magazine.This paper covers the project challenges and the resulting innovative solutions developed to deconstruct the viaduct safely in an extremely constrained environment.