The Sydney Metro Viaduct is a pivotal link in the city’s largest public transport project, connecting Orchard Hills to Luddenham via a 3.2-kilometre elevated structure.
Traversing floodplains and major pipelines, the viaduct will carry the new Metro line directly to Western Sydney International Airport, unlocking faster, more efficient travel and boosting economic growth across the region.
Delivered by the CPB–United Joint Venture, the project relied heavily on precast and required precision engineering, sustained production output, and seamless coordination with onsite works to keep Australia’s largest public transport project moving on schedule.
Complex scope, demanding conditions
National Precast member Ozcast was engaged to manufacture and supply 2500 precast concrete parapets for the viaduct. Essential to both the structure’s durability and commuter safety, quality and consistency could not be compromised.
While the project benefited from generous lead times, production still had to be meticulously scheduled to align with staged construction. Any delay in parapet supply could have a knock-on effect, disrupting viaduct assembly and slowing the broader Sydney Metro program.
Precision planning, high-volume output
In preparation for precast manufacturing works, Ozcast developed 15 high-quality custom moulds ahead of the production ramp-up. This investment in tooling enabled rapid, repeatable casting while maintaining tight tolerances across all 2500 units.
As construction works progressed and throughout manufacture of the units, close collaboration with the joint venture was critical. Advanced 3D modelling allowed for design refinements in real time, while weekly progress meetings ensured any shift in site requirements was immediately factored into the production schedule. This approach reduced the risk of storage bottlenecks and ensured every parapet was delivered exactly when needed.
A single source of truth
Clear and consistent communication underpinned the project’s success. “Maintaining a regular, open dialogue meant we could adapt instantly to changes without impacting output or quality,” says Ozcast Precast Manager, Barry Lindsay. “Having a single point of contact within the JV kept decision-making fast and focused.”
Built for today, ready for tomorrow
The Sydney Metro Viaduct is the precaster’s largest project to date, manufacturing elements that will soon help move millions of passengers efficiently across Western Sydney.
According to National Precast Executive Advisor Sarah Bachmann, the project is testament to Ozcast’s ability to deliver high-volume, safety-critical precast components for complex, long-term infrastructure. It also exemplifies collaborative delivery in Australia’s transport future, reaping the rewards from involving the precaster early in the process.
“Projects of this scale demand suppliers who can match high-volume capability with precision and reliability,” Bachmann says.
“Ozcast’s performance on the Sydney Metro Viaduct is a clear example of how our members bring both technical skill and operational discipline to Australia’s most important builds.”
This article was originally published in the December edition of our magazine. To read the magazine, click here.
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