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 late-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.
At Airport West EES excavation has been completed between the shaft and Tunnel One. Waterproofing works to prepare for the construction of the cross passage base slab are underway and the entire cross passage is scheduled to be completed by the end of April. Excavation of the cross passage to Tunnel Two will commence once TBM Sandy's 130m-long trailing gantries have cleared the area.
Waterproofing for the base slab inside the 39m-deep Wright Crescent emergency egress shaft (EES) was completed late-March, enabling the base slab to be poured. Outside the shaft the construction of the ground slab is ongoing with the installation of conduits for services such as power, water and firefighting systems.
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