Tunnelling work on the new Sydney Metro in Australia has reached a major milestone with the launch of the third tunnel boring machine (TBM) on the project by contracting joint venture John Holland CPB Ghella.
The TBM – named Wendy – will drive the 6.2km long tunnel from Chatswood to the edge of Sydney Harbour at Blues Point.
TBMs Nancy and Mum Shirl are already driving the 8.1km twin bore tunnel from Marrickville towards the central business district. Both TBMs are reported to have driven 1.3km of the tunnels so far.
Two further TBMs are expected to be launched this year and will drive the tunnels between Marrickville and Chatswood including the first rail tunnel under Sydney Harbour.
The new tunnelled section of the Sydney Metro will create 31km of new twin bored tunnels and is due to open in 2024.