Two 7m diameter double-shield, hard rock, gripper-type Herrenknecht TBMs driven by the Acciona Ferrovial Joint Venture have arrived at Burwood North Station site as the 24km Sydney Metro West twin tunnels connecting Greater Parramatta and the Sydney CBD continue to take shape.
The TBMs are more than halfway through the 11km journey to carve out the section of the $1.6bn alignment between The Bays and Sydney Olympic Park, via future station sites at Five Dock, Burwood North and North Strathfield.
This is the second stop for TBMs Beatrice and Daphne who broke through at Five Dock Station in December 2023.
The TBMs have each built 6.26km of tunnel, so far excavating a combined 1,200,000 tonnes of muck and installing around 44,100 segments to line the new tunnels.
To prepare for the arrival of the TBMs, the Burwood North station box cavern was excavated and about 532,105 tonnes of material was removed to create the 29m deep box-like structure that is 25m wide and 194m long.
It will take just over two weeks for the TBMs to traverse to the western end of the cavern where they will be relaunched to tunnel the 1.8km to the next stop at North Strathfield Metro Station site.
TBMs Beatrice and Daphne are due to complete the journey to Sydney Olympic Park in the second half of 2024.
These are two of six TBMs being used to build the 24km of tunnels from the Sydney CBD to Parramatta, which have been split into three sections.
Autonomous TBMs Betty and Dorothy are also tunnelling to Sydney Olympic Park and are 3.31km and 2.67km into their journey respectively, as they build the tunnels in the opposite direction, towards Westmead. Gamuda Australia/Laing O’Rourke Consortium was awarded this $2.16bn Western Tunnelling contract to deliver the 9km of twin metro rail tunnels.
A further two TBMs are getting ready to launch this year from The Bays and will construct the 2.3km metro tunnels below Darling Harbour and into the Sydney CBD.
John Holland, CPB Contractors (CPB) and Ghella joint venture (JCG JV) will deliver this Eastern Tunnelling Package featuring the metro rail tunnels between The Bays and Hunter Street in the Sydney CBD.
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.
Sydney Metro West will double the rail capacity between Sydney’s two biggest CBDs once passenger services commence in 2030
Herrenknecht
Pioneering Underground Technologies - Herrenknecht AG is the technology and market leader in mechanized tunnelling. As the only company worldwide, Herrenknecht delivers cutting-edge tunnel boring machines for all ground conditions and in all diameters - ranging from 0.10 to 19 meters.
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