Tunnelling at Forrestfield, the site that hosts the infrastructure vital to tunnel boring machine (TBM) operations, began in August (TBM Grace) and October (TBM Sandy) 2017. The site is operating 24 hours a day to support tunnelling activities, including processing excavated soil and treating water for reuse in the tunnelling process.
Construction of infrastructure is progressing well across all areas of the Forrestfield site, however focus has shifted to the central and northern areas, with the completion of civil works for the stowage building and the 130m-long stowage platform at the southern end of the site. Fit-out of the stowage building will commence later this year. The stowage area is the place where trains will be maintained whilst not in use.
At the centre of the site, significant progress has been made with the completion of the suspended section of the concourse level. This was followed by the installation of the first set of escalators, connecting the concourse and platform level. The escalators will be wrapped for protection from weather until it is commissioned once the station opens.
Following the installation of the public escalators, the 31 steps-high public staircase between the station's concourse and platform levels was craned into place earlier this month. The passenger lifts will be installed later in the year, with the 10.5m-high lift frames on either side of the staircase already in place.
Construction of the steel structure for the station's lower roof has also commenced, with the main roof expected to be installed later this year.
At the portal end of the site and above the tunnel entries, work is progressing well on the portal building structure. Following the roof construction, scheduled for September, mechanical, electrical and plumbing fit-out will commence. The roof installation at the station building is already in full swing with sheeting and gutters currently being affixed.