Incremental launching challenges on Mount Henry Bridge

As part of the new Southern Suburbs Railway construction in Perth, a new Mount Henry Bridge was constructed alongside and partially overhanging the existing bridge to widen the freeway. The new bridge was incrementally launched which provided the design and construction team with a number of unique challenges, particularly in maintaining clearance to the old structure. The bridge spans were halved for launching using temporary piers which significantly reduced deflections enabling tighter control over the launch. However the temporary piers provided their own unique challenges and had to be propped to the existing bridge and adjacent permanent piers to improve the buckling behaviour of the slender pile sections, as well as preset to reduce vertical loading. Testing and monitoring of the insitu pier movements was used to confirm the design assumptions, in particular the lateral restraint provided by the soft river alluvium material. The tight construction schedule required launch cycles to be minimised which was achieved by adopting a two staged pour for the deck and minimising the prestressing operations. (a) For the covering entry of this conference, please see ITRD abstract no. E214936.

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  • English

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  • Accession Number: 01054982
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Aug 6 2007 2:11PM