The Sydney Metro – Western Sydney Airport Surface, Civil and Alignment Works (SCAW) project has made progress with the recent completion of a section of a new 23-kilometre alignment.
Delivery of this metro section involved building an elevated viaduct over the Warragamba pipelines, which transport 80 per cent of Sydney’s water from the Warragamba Dam to filtration plants for treatment each day.
Working in coordination with WaterNSW to ensure minimal impact on water supply, the CPB Contractors and United Infrastructure teams methodically constructed a two-span section of elevated viaducts in one month.
Vishal Khosla CPB Contractors Project Manager explains the efficiency and safety-focused process the project team used to deliver this complex portion of works.
“We scheduled this highly technical task during Sydney’s cooler months as water demand is lower,” he said.
“This allowed the WaterNSW crews to safely depressurise and deactivate one pipeline at a time, enabling the installation of 26 precast segments up to 15.3 meters above the pipelines.”
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The preparation for constructing the viaducts involved strengthening the ground around the pipelines and conducting thorough vibration and settlement monitoring throughout construction.
Central to the strategy for protecting the integrity of the pipelines was the project team’s use of Underslung Temporary Beams (UTBs).
These purpose-built UTBs were used to support the segments while crews lifted and positioned the precast segments, eliminating risks to the pipelines below.
For more information, https://www.sydneymetro.info/westernsydneyairportline
