Gateway Upgrade Project

Gateway Upgrade Project
Leighton Abi Joint Venture (LAJV)
Techniques Used: 
Permanently cased bored piles, displacement piles, CFA piles, prestressed and precast driven piles, wick drains and dynamic replacement.

Project Brief: With a final project value of over AUD$110 Million, the Gateway Upgrade Project (GUP) was Australia's largest ever piling project. The main contract works valued at AUD$1.88 Billion comprised 20
kilometres of upgrades to Gateway Motorway, including:

  • The duplication of the iconic Gateway Bridge
  • 12 kilometres of new lanes and upgrades south of the Brisbane River
  • 7 kilometres of new motorway north to Nudgee Road, including enhanced access to the Brisbane airport
  • A new pedestrian and cycle way including four viewing platforms looking east to Moreton Bay

Geological Conditions: Geological conditions varied considerably across the 20km length of the project. In addition to the main bridge structure which had to be designed to a 300 year design life, a major challenge for the project was extensive soft soils throughout the Northern section of the works which comprised marine sediments which were highly compressible and required extensive ground improvement. The main bridge structure was supported on permanently cased bored piles socketted into the underlying rock formation at a depth of approximately 45m.

Scope of Work: Foundation piling was required to 30 bridge structures and a significant portion of the northern section of motorway(~7km) required various forms of ground treatment to deal with soft  soils and disused landfill sites.  At the peak of the project over 20 piling rigs and 12 cranes were on site requiring over 120 piling personnel. Piling works comprised approximately 700 # of permanently cased bored piles up to 2m in diameter and to maximum depths of up to 60m and approximately 50,000lm of prestressed concrete driven piles.  Ground improvement works on the site comprised approximately 5000 # displacement piles, 2000 # CFA piles, 1.1M lm of wick drains, 5000 lm of dynamic replacement and 52,000 lm of precast piles.

Conclusion: Due to the size and complexity of the project LAJV entered into a sub-alliance with the Keller Group of companies. Vibropile, in joint venture with other Keller Australia companies, was able to deliver the necessary resources, experience and technical expertise to deliver the largest road project ever undertaken in Queensland.