Design and construction of motorway bridges over Little Doris Creek - Ipswich Motorway

The Little Doris Creek Bridge is a single 25m propped span consisting of Department of Transport and Main Roads (TMR) deck units with a composite deck. The bridge crosses Little Doris Creek, Oxley which has an existing eight cell box culvert structure to be removed during the staged construction works. The bridge is supported by closed ended steel driven tubes, which are later filled with reinforced concrete. Shotcrete facing spans between the piles, and a rock filled berm was specified in front of the vertical abutment wall for additional robustness. This paper describes the design journey and construction challenges faced in developing the final design solution which ranged from options to retain and strengthen the existing eight cell box culvert structure through to the final single span bridge solution being presented. The staged construction involved top down excavation and thus a temporary tie back system using tied sheet piles was required, to support a 5m deep vertical excavation facilitating the culverts removal and associated earthworks. The design considerations and solutions are presented below including temporary staging/works, a non-standard piling system requiring TMR approval, sensitivity analysis of the rock filled berm support, flooding/rapid draw down effects, durability of steel driven piles and addressing client concerns. The Little Doris Creek Bridge forms part of the $400 million, jointly funded Australian and Queensland governments, Ipswich Motorway Upgrade: Rocklea to Darra – Stage 1 project.

Language

  • English

Media Info

  • Pagination: 14p
  • Monograph Title: 9th Australian Small Bridges Conference, Surfers Paradise, Queensland, 1-2 April 2019

Subject/Index Terms

Filing Info

  • Accession Number: 01714748
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Files: ITRD, ATRI
  • Created Date: Aug 26 2019 11:34AM