Central Motorway Junction stage 1: widening and retrofit of existing bridges

The Central Motorway Junction Stage 1 project was a major upgrade of 2km of State Highway 1 in Auckland, New Zealand. The project included an additional southbound lane, provision for another lane over part of the project length and various safety improvements including barrier, signage and drainage upgrades. A significant part of the work was the widening, live load strengthening and seismic retrofit of the Khyber Pass Viaduct, Grafton Bridge #2 and Grafton Bridge #3A. All three existing bridges are multi-span post tensioned concrete box girder structures constructed in the 1970s. The project is located on the busiest section of the New Zealand motorway system with traffic loading of 200,000 vehicles per day. The client required all existing lanes to be kept open at all times except for short durations at night. This paper deals with the design and construction challenges of this very interesting project. (a) For the covering entry of this conference, please see ITRD abstract no. E214936.


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  • Accession Number: 01051065
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Jun 11 2007 1:16PM