Fiona Stanley Hospital

Fiona Stanley Hospital
Client: 
Brookfield
Value: 
$6M
Techniques Used: 
Large Diameter, Deep CFA Piles and Sheet Piles

Project Brief: The Fiona Stanley Hospital (named after Professor Fiona Stanley AC, Australian of the Year in 2003, and honoured as a “National Living Treasure” by the National Trust in 2004) at Murdock, is the largest infrastructure project ever undertaken by the WA Government. It will be the major tertiary health facility in the south metropolitan area, offering comprehensive healthcare services to communities in Perth and across the state and provide high level medical and teaching facilities. Fiona Stanley Hospital is the centre piece of the State Government’s renewal of the health system and is part of a $5 billion investment in health infrastructure across WA.

Geological Conditions: The Fiona Stanley Site is located on a green field site in the suburb of Murdoch, 12km south of the Perth CBD and some 9km east of Fremantle. Subsoil conditions comprised sands of varying densities, to depths in excess of 40m with a shallow groundwater table.

Scope of Work: The original foundation scheme comprised the construction of mass pad footings covering a approx. 60% of the total building footprint, and inducing local settlement in the order of twice the maximum permitted under the works specification. Upon review of the project documents, Vibropile provided an alternative piled foundation scheme comprising concrete injected continuous flight auger construction technique, which offered superior settlement performance with settlements in the order of 25% of the conforming options. The piled solution offered further benefits comprising an expedited construction program, less in-ground congestion for the service provision and costs in both materials and time.

Vibropile partnered with Delta Group and BG&E structural engineers to deliver the whole preliminary works package. Foundation elements comprised the design documentation, construction and verification testing of 650 piles, (including settlement reducing piles to control differential settlement issues associated with the adjacent building founded on shallow pad foundations).

Foundation pile diameters varied from 600mm to 1050mm, with installation depths up to maximum of 35.0m to support individual column loads up to 25MN, including provisions for a 1:2000yr earthquake criterion.  The use of the largest rigs in Vibropile’s fleet; Fundex F3500 (47Tm torque, making it one of the largest CFA rigs in the world), and the Enteco E25 (32Tm), provided the horse power and means to construct such large diameters to these depths with the level of quality required.

Conclusion: Given strict project time lines Vibropile was requested to mobilise to site early whilst the design documentation was being comprised, offering a head start on the project. This would not have been possible if not for Vibropile’s in-house design capabilities and the aligned partnership with the structural engineers.
The piled foundation alternative offered superior settlement performance with settlements in the order of some 25% of the conforming options, offered both material savings of some $2M and time cost savings putting the works ahead of schedule.