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 site.
After completing the station platform foundation walls, backfilling has begun. Within the next few weeks all utilities including hydraulic, electrical and fire protection services for the station platform will be completed.
At concourse level, a number of concrete pours have been completed for the station’s 130m-long concourse slab. To enable the last section to be poured, three 4m-wide and 8m-tall tilt-up panels have been added to the station's retaining wall. The slab is expected to be finalised by the end of April, by which time a total of 300 cubic metres of concrete will have been poured. Installation of steel, to form the station roof, will commence shortly after.
South of the station, the stowage building’s brickwork and roof construction have recently been completed. The stowage area is the place where trains will be maintained whilst not in use. Topping slabs for the stowage area platforms will be constructed next.
At the northern end of the site brickwork on the portal building is progressing well and construction of lift and stair shafts is ongoing.