The Houghton Highway Duplication project involved the construction of a new 2.73km bridge, major new intersection works, constructed under traffic at both ends of the bridge, and reclamation of 20,000m2 of Bramble Bay. The new bridge consists of 78 spans, each 35m long, and major earthworks included 200,000m3 of materials imported and compacted. The longest bridge in Australia and the third-longest in the Southern Hemisphere at the time of completion, the new bridge features three traffic lanes, a pedestrian/cycle path and a dedicated fishing platform. The bridge and reclamation works were successfully constructed over culturally significant rock formations and required in depth planning with the local indigenous tribes as well as the DEHP.
Houghton Highway Duplication and Approaches included;
- Demolition of existing timber Horninbrook Bridge while using the existing bridge as access. In depth design analysis of the structure and careful selection of plant allowed an average of 1.5 spans to be removed per day
- Construction of a pedestrian underpass below the existing Houghton Highway bridge, below seabed level while not undermining the existing structure.
- Design and construction of an Integrated Traffic Management System to safely cater for road users
- Construction of approaches delivered under traffic – 30,000vpd