Results
Successfully stabilised and reinforced shaft foundations at the TBM portal
Improved the integrity of large retaining structures supporting the tunnels and ramps
Completed all works on schedule to support the safe delivery of Australia’s longest road tunnel
Project
Solution
Deployed two specialist mini piling rigs to drill 200mm diameter holes up to 40m deep through reinforced concrete piles
Installed high-tensile steel reinforcement cages, grouted into place to secure pile bases into the Welded Tuff rock
Completed post-grouting using tube-a-manchette techniques to seal pile bases and improve foundation integrity
Delivered additional packages of work including permanent rock bolts, temporary ground anchors, and shotcrete for retaining structures
Project
Challenges
Extremely hard Welded Tuff rock that standard large-diameter piles could not socket into
Tight tolerances for drilling within 1200mm reinforced concrete piles
Maintaining safety and accuracy within a congested urban construction site
Meeting demanding timeframes to align with tunnelling and bridge works
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Project
Overview
The Airport Link and Busway Project was one of Australia’s largest infrastructure developments, involving 15 kilometres of tunnelling for roads, busways, and connecting ramps, as well as 25 bridges and over 7 kilometres of new road. At the time of construction, it was Australia’s longest road tunnel.
Geovert was engaged in the initial phase of the piling works at the TBM (Tunnel Boring Machine) portal, delivering precision drilling and foundation reinforcement to support the critical shaft construction.