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4.25 km tunnels in Brisbane QLD, Australia See on Google Maps
The project, developed by a consortium led by ACCIONA, has helped to shape a road system around Brisbane, reducing a journey time of twice as long to 14 minutes with minimal impact on the local habitat. The aim was to improve traffic and connections with metropolitan areas and the airport in Brisbane, Australia's third largest city.

It involved the construction of the Legacy Way tunnel and the toll road connecting the western Toowong highway to the city centre. The project involved the design, construction, operation and maintenance (for 10 years) of 4.25 km twin road tunnels, with an outer diameter of 12.4 metres (11.3 m internal diameter) in an urban environment. The tunnels created a bypass connecting the western highway in Toowong to the Inner City bypass in Brisbane.

 

Construction of the tunnel included 2 access shafts, 2 ventilation stations, 36 crossing galleries, 2 underground and 2 surface substations, and 1 low-rise sump. The tunnel portals were excavated using top-down construction methods, whilst other areas were excavated using conventional methods.

GENERAL INFORMATION

  • Location: Brisbane, Queensland, Australia.
  • Contract: Design, construction, operation and maintenance (PPP) for 10 years.
  • Infrastructure: 8.6 km of motorway in twin parallel tunnels, 4.60 km long and with an outer diameter of 11.30 metres of lining. Built with double shield TBMs, one of which achieved a world record excavation record.
  • Year of project completion: 2015

KEY ASPECTS

The following were shown during project implementation, among other things:

  • Excellent and recognised management of a wide group of stakeholders in an urban environment.
  • Conservation of a publicly sensitive area of cultural heritage.
  • Effective and innovative management of waste and noise impacts on the community.
  • A complex network of government and community stakeholders, including a large high school and botanical gardens on site.
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