Bridges

Cover of Designing the Deconstruction of the Existing Newmarket Viaduct
Designing the Deconstruction of the Existing Newmarket Viaduct
  • Publication no: ABC-CAS003-11
  • Published: 31 October 2011

The Newmarket Viaduct plays a vital role in the Auckland motorway network. The original 1966 structure is being demolished in tandem with construction of its replacement whilst keeping the motorway fully operational. The New Zealand Transport Agency (NZTA) funded scheme is being accomplished within an extremely confined site, requiring the new northbound viaduct to be constructed within the footprint of the original southbound superstructure.

This paper describes the analytical approach adopted for the complex and unprecedented challenges of deconstructing this bridge. Aspects covered include:

  • The interaction of the existing structure with the various temporary works elements and the 810 tonne launching gantry that is being used for the deconstruction work
  • Identification of potential vulnerabilities during various stages of deconstruction, facilitating a risk based approach to the provision of strengthening