Laing O'Rourke

In progress

Brisbane, Australia

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Creatively thinking to remove a potential costly project delay when faced with difficult ground conditions.

Ann Street


Brisbane, Australia

The construction of a Brisbane project including 12 level commercial office tower, a 22 level residential tower and a 4 level mixed use building with recreational landscaped deck was in danger of extensive project delays due to the presence of strong rock in the project grounds, making excavation a lengthy process.

The contractor requested the use of slip form construction for the central lift and stair cores to the residential and commercial buildings. This allowed the building structural works to commence whilst excavation work continued into the strong rock below ground.

ADG delivered both an economical solution to keep work progressing and a talking point around town to give the development’s pre-sales and leasing team some prime advertising

A second challenge was to mitigate a potential extensive delay from when the cores were to be completed and the structural slab construction was to commence.

We carried out detailed finite element analysis of the core structures to analyse staging to minimise temporary works requirements. The cores were able to cantilever over 60m high from foundation level, while maintaining structural integrity of the wall and its foundation. This result was minimal strutting between cores and alleviated the need for ground anchors to resist overturning.