Redcliffe Community Zone
With the completion of excavation and waterproofing works earlier in 2018, focus had shifted to the construction of the station’s base slab.
It took nine separate concrete pours over six months to build the 1.5m deep, 150m long and 25m wide base. Each pour took around seven hours, with trucks delivering a continuous supply of concrete – up to 650 cubic metres for a single pour.
Preparation works have now commenced for the arrival of the TBMs, including removal of temporary struts and construction of in-situ double segment supports. These blocks will support the TBMs and their 130m long trailing gantries being manoeuvered through the station box to where the cutterhead is to be lined up for the next section of tunnelling.
Column construction is also underway. Out of 20 columns, 12 are scheduled to be cast prior to the TBMs’ arrival early next year.
The arrival of the TBMs will see some changes in activity at the Redcliffe site. One of the main changes will be the start of 24-hour operations. From early-2019 an electric tower crane will operate 24 hours to feed segments into the station box for the TBMs.
In January 2019 the construction team will also commence works to establish the future car park, located adjacent to Dunreath Drive behind homes in Central Avenue and Second Street.
Dewatering and environmental testing
Through routine environmental investigations for the construction of Redcliffe Station, the Public Transport Authority (PTA) has discovered perfluoroalkyl and polyfluoroalkyl substances (PFAS) in the groundwater. PFAS are manufactured compounds that have been used in certain types of firefighting foams and a range of consumer products, including non-stick cookware, fabric treatments, furniture and carpet stain protection, and food packaging since the 1950s. Environmental contamination by PFAS is an emerging challenge worldwide, and in WA is starting to be reported at various sites.
PTA has reported the results from the project’s environmental testing to the Department of Water and Environmental Regulation (DWER), the state regulatory agency. The presence of PFAS at the site has not been caused by the Forrestfield-Airport Link project and during the dewatering process, a strict management and monitoring regime has been in place to ensure PFAS is not spread.
The dewatering program began in February 2018, with the target level reached in March. Three of the six dewatering wells installed are currently in operation, with the water pumped into four reinjection bores outside the station box. Dewatering is scheduled to be turned off by the end of the year.
Water levels are closely monitored and have remained within 1m of the recorded groundwater levels for the area.
To find out more, view the Redcliffe Station dewatering fact sheet.
Frequently Asked Questions