Emergency exit points
After waterproofing was completed at the Abernethy Road emergency egress shaft (EES), the permanent concrete between the tunnels and the shaft was poured late last year. Construction of the staircase, lift shaft and ancillary building will commence in April.
The buildings located on top of each shaft house communications, electrical and mechanical equipment, and controls. They also contain air vents which will help ventilate the shafts and tunnels.
The base slab for the Airport West EES has been completed. Excavation of the cross passages, which connect the shaft to each of the tunnels, is due to start in the coming months. Works involve excavation utilising temporary steel frame supports, followed by waterproofing and construction of a permanent reinforced concrete lining.
Excavation of the 39m deep Wright Crescent EES in Bayswater was completed late last year. Approximately 2500 tonnes of soil were excavated from the shaft. With this complete, activity has now turned to waterproofing the base in preparation for the base slab concrete pour.
Cross passages and emergency egress shafts
The route for the Forrestfield-Airport Link includes 8km of twin-bored tunnels, with safe entry and exit points via underground stations at Redcliffe and Airport Central. Trains will enter the underground rail line via tunnel portals at Bayswater and Forrestfield.
Given the length of the tunnels, additional infrastructure is required between the stations to allow safe egress to the ground level in the event of an emergency, and access to the tunnels for maintenance. As such, 12 cross passages and three emergency egress shafts will be built along the alignment.
View the emergency exit points fact sheet.
The cross passages are located at numerous points along the route to provide a connection between the tunnels. In the unlikely event of an emergency, passengers will be able to exit the train and use the tunnel walkways to locate the nearest cross passage. They will then be able to enter the adjacent tunnel safely and exit through the nearest emergency egress shaft, station or dive structure.
Cross passages are constructed using the jet grouting process, a construction technique used to improve ground conditions and stabilise soils in preparation for tunnelling works.
Emergency egress shafts
Emergency egress shafts provide emergency exit points for passengers along the tunnel alignment. In the event of an incident, commuters will access the emergency egress shafts using the cross passages and walkways within the tunnel. They will then be able to use either the stairs or the lift contained within the emergency egress shaft to reach ground level.
The shafts lead to a two-storey portal building, car park and emergency muster point.
The portal buildings house communications, electrical and mechanical equipment and controls. They also contain air vents which will help ventilate the shafts and tunnels.
Emergency egress shafts will be built in three locations along the alignment:
- Wright Crescent, Bayswater
- Woods Road, within the Terminal 3 & Terminal 4 Precinct (Airport West)
- Abernethy Road, Forrestfield