The first TBM launched on the Sydney Metro City & Southwest project has broken through at Waterloo after tunnelling 3.1 km from Marrickville.
TBM Nancy started digging from Marrickville in October 2018 and has since carved through about 304,000 tonnes of rock, enough to fill 47 swimming pools, building a 3.1 km tunnel in less than six months.
TBM Nancy is one of five TBMs building the 15.5 km twin railway tunnels between Chatswood and Marrickville.
“This is history in the making as we get on with the job of delivering turn-up-and-go Metro services up to every two minutes from Chatswood, under the Harbour and CBD and onto Bankstown,” New South Wales Premier, Gladys Berejiklian, said.
Nancy will keep tunnelling to Barangaroo via new metro stations at Central, Pitt Street and Martin Place, delivering an 8.1 km tunnel. Her mega borer stablemate TBM Mum Shirl is doing the same and is a few hundred metres behind TBM Nancy in delivering their twin tunnels.
At Waterloo station, it has taken tunnel builders John Holland CPB Ghella about 12 months to excavate about 323,000 tonnes of rock 26 metres deep to build the underground station “box” prepare for TBM Nancy’s arrival.