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.
Forrestfield has taken its first delivery of rail, with almost 9000 linear metres unloaded to date. Sections of rail will be welded together before installation commences in the first half of next year.
At the portal building, located above the tunnel entry and exit points, external cladding has been fixed to the steel framework, which finalises construction of the building superstructure. Fit-out with heating, ventilation and air-conditioning services is ongoing.
At the southern end of the site, the stowage building id about 85 per cent complete, with only internal fit-out remaining. Work has also progressed on the future Transperth car park, with asphalt laid in recent weeks.
Following the installation of passenger staircases and escalators between concourse and platform levels, works on the steel structure of the main station roof has commenced. Roof sheeting and skylights will be added in the first half of 2020.