Final mega TBM Ruby launches into action to finish Metro West tunnel under Sydney Harbour
16.10.2024
Tunnel boring machine (TBM) Ruby has begun its journey to carve out the final section of tunnel for the city-shaping Sydney Metro West project.
Launching from The Bays, TBM Ruby will join TBM Jessie in constructing 2.3-kilometre twin railway tunnels that will take metro deep below the harbour, this time creating another key connection into the heart of the city for people living in Sydney’s west.
TBM Ruby is named after women’s rights activist and Australia’s first radio astronomer Ruby Payne-Scott and is the sixth and final TBM to get to work on building the 24-kilometre Metro West tunnels.
The 1,100-tonne machine will operate around the clock, seven days a week. It will slowly inch its way alongside the iconic Anzac Bridge, through the Pyrmont Station site, and under Darling Harbour, before arriving at Hunter Street in the Sydney CBD.
TBM Jessie is hard at work on the parallel tunnel and has excavated 615 metres and installed 2,238 concrete segments to line the new tunnel walls since commencing its tunnelling journey in June.
A total of 460,000 tonnes of material will be excavated and 16,536 segments will be installed by the two TBMs to construct the tunnels between The Bays and Hunter Street.
These tunnels will form the second under-harbour railway crossing for Sydney, with the first built between the city’s north and Barangaroo for the metro M1 line, which has recorded 10 million passenger journeys since opening on 19 August.
TBMs Ruby and Jessie are heading towards Pyrmont Station, where they will traverse the station cavern before being relaunched towards Hunter Street Station.
TBMs Ruby and Jessie are mixed shield (slurry) machines, specifically designed for the Metro West project to excavate in the highly pressurised conditions under Sydney Harbour.
Parts of both TBMs came from the TBMs used to construct the Sydney Metro City & Southwest tunnels.
The TBMs are expected to arrive at Hunter Street in mid-late 2025.
Sydney Metro West will double rail capacity between Greater Parramatta and the Sydney CBD. It will make it easier and faster to travel around western Sydney, link new communities to rail services and support employment growth and housing supply.
For more information about Sydney Metro West, visit www.sydneymetro.info/west/project-overview