Roadheader excavation begins on Metro Tunnel project29 November 2018
Australia – The first roadheader was due to being excavation on Melbourne’s Metro Tunnel project as Tunnels and Tunnelling went to press. Premier Daniel Andrews was on site to see the assembly of the 118t machine at the bottom of a 30m shaft.
The caverns for the two CBD stations on the project are to be excavated by six roadheaders. he station will be 240 metres long and 30 metres wide, with platforms about 36m underground.
Main tunnelling for the Metro Tunnel project will comprise twin 9km-long, 7m o.d. running tunnels tunnels will be constructed by TBM at a depth of up to 42m through a range of ground conditions, including rock, sands, clays and silt. The TBMs will also underpass two waterways: the Yarra River and Moonee Ponds Creek.