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.
Following the installation of hydraulic, electrical and fire protection services within the station platform area, concrete pours of the 15 sections of the platform slab were able to commence and are nearing completion.
Eight of 12 steel columns to support the suspended concourse slab have been erected on top of the station platform. With the columns in place, formwork is being installed ready for the suspended slab to be poured in the next two months. Once cured, the slab will form an extension to the concourse level, where ticketing and information facilities will be located.
At the portal end of the site, and just above the tunnel entry/exit, brickwork for the multi-storey portal building and structural steel are being installed, taking construction up to mezzanine level.