Tonkin Consulting

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Bardavcol for Transport SA

Port River Expressway

Stage 1

The first stage of the Port River Expressway was a $92 million, 6 kilometre, four-lane expressway link between Eastern Parade and South Road. The Expressway is an important transport route linking South Australia’s export and industrial areas. It reduces travel time for motorisst travelling from Port Wakefield Road and Salisbury Highway to the LeFevre Peninsula. The Expressway has been primarily constructed to alleviate congestion problems on South Road, Cormack Road and Grand Junction Road and is expected to carry around 40,000 vechicles per day.

Tonkin Consulting was the lead design consultant for the Bardavcol/York Civil Joint Venture for Stage 1, designing the significant grade separated interchanges.

The expressway was built over existing wetlands and former contaminated landfill site, posing significant geotechnical and subgrade site condition challenges. The expressway also crosses six of Adelaide’s major stormwater outfalls, each requiring augmentation and integration with the roadway including substantial changes to stormwater and existing wetlands.

Tonkin Consulting designed  the multi-lane expressway to withstand the high percentage of heavy vehicle use.

The pavement design solution incorporated the pre-loading of the weak subgrades and extensive replacement of the subgrade by selective mixing site solids to manage the construction settlement and construction costs.

Several million dollars was saved by not having to excavate and transport approximately 300,000 cu m of totally unsuitable subgrade by blending it with better underlying soil found at a depth of three metres.

The design included two major grade separated intersections (Eastern Parade and Hanson Road) , and a third, which was originally intended to be an at-grade/signal controlled intersection, was upgraded to a free-flow interchange.

The project won a state and national award for environmental excellence as the expressway passed sections of previous landfills, wetlands and six of Adelaide’s major stormwater outfalls.

Details

  • Environmental investigations and studies to understand the impacts of the expressway running over the wetlands.
  • The design also considered the flight paths of migratory birds visiting the wetlands.
  • Traffic modelling, which determined the intersections would be at capacity from day-one if the project was designed in accordance with the original concept,.
  • Major earthworks design and supervision.
  • Major intersection design and interchange bridges.
  • Geometric and structural design of a high standard expressway.
  • Supervised contruction works.

Awards

The project won a state and national award for environmental excellence as the expressway passed sections of previous landfills, wetlands and six of Adelaide’s major stormwater outfalls.

  • National Winner – Category 3 – Environmental Excellence (projects over $15 million) 2006
  • South Australian Winner - Category 3 – Environmental Excellence (projects over $15 million) 2006

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