Bridge over Cooks River at Tempe, Sydney, NSW: emergency underpinning of piers

Underwater inspections revealed that the driven prestressed concrete piles of the existing 42 year old, 3 span, 100 metres long, 6 lane bridge across Cooks River at Tempe were in extremely poor condition due to a phenomenon known as delayed ettringite formation. The Bridge Section of the Roads and Traffic Authority of NSW (RTA) developed an innovative concept for supporting and jacking each pier without the need for closing the bridge to traffic. Both pilecaps were supported on steel yoke beams held up by stressing bars attached to steel transverse beams located on top of new bored piles. The supporting system was carefully designed to eliminate the need for even minor demolition of any part of the existing structure during installation and allowed for future encapsulation into permanent works. This paper provides an overview of the project with emphasis on how the issues encountered in design and construction of the emergency underpinning of the piers, were resolved. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.


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  • Accession Number: 01011309
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 3:01PM