Our first tunnel boring machine breakthrough
Posted: 23 Feb 2019
The first section of the Metro Tunnel is now complete – with the first tunnel boring machine (TBM), Joan, today breaking through to complete the journey from Arden Station to the tunnel’s western entrance in Kensington.
After tunneling under rail lines, CityLink, Moonee Ponds Creek, North Yarra Main Sewer and the West Melbourne Terminal Station, Joan – named after former Victorian Premier Joan Kirner – has now broken through a 13-metre-deep shaft at Childers Street, Kensington.
Since her launch in August 2019, Joan has travelled 1.2 kilometres and installed 4,200 curved concrete segments to create 700 rings lining the walls of the tunnel. The segments, each weighing 4.5 tonnes, are among 56,000 being manufactured by 70 workers at a purpose-built concrete manufacturing plant in Deer Park.
The second TBM, Meg – named after Australian women’s cricket captain Meg Lanning – is travelling on a parallel route to carve out the second tunnel from Arden to Kensington and will break through in the coming weeks.