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- W745407182 abstract "The need to link two urban areas while providing for its future development, as well as supporting a critical water main support structure across a wetland was the key aim for Wyong Council’s proposed road works project. Ensuring that minimal impact was imposed on the protected wetland while complying with significant site constraints resulted in the adoption of a 444m long bridge structure. The superstructure of this bridge comprises an 11m wide roadway, a 3m footway and in addition carries two large diameter water mains on either deck edge. A design development process considered various bridge types with the most cost effective solution determined as being an unusual bridge superstructure suitable for incremental launching. This construction methodology was selected to minimise impact on the wetland by limiting disturbance to natural ground for superstructure works and proved to be optimal in comparative cost estimates. This paper covers the design development of the superstructure and substructures for construction by the incremental launching technique. The deck section is unique in that it comprises twin solid beams linked by a top slab that also serves as the edge cantilevers. The deck edge cantilevers incorporate supports for large diameter water mains. A key design feature was the accommodation of the concentric post-tensioned tendons within the deck section and the innovative placement of the second stage or draped tendons. These required particular attention for development of a workable solution. There being no conforming alternative solutions offered at tender stage, the design was through an open tender process, confirmed the design to be the optimal solution. (a) For the covering entry of this conference, please see IRRD abstract no. E218160." @default.
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- W745407182 date "2009-05-01" @default.
- W745407182 modified "2023-09-27" @default.
- W745407182 title "Porters Creek Wetland Bridge: design of a unique incrementally launched bridge" @default.
- W745407182 hasPublicationYear "2009" @default.
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