TBM breaks through in Perth

A tunnel boring machine (TBM) on the Forrestfield-Airport Link has broken through.

TBM Grace has completed the 4.6 km journey from Forrestfield, which started in mid-2017, and broke through at Redcliffe earlier this month.

Before the TBM could break through into the station box it needed to tunnel through the dry box, an underground structure located adjacent to the station wall which helped to correctly pressurise the breakthrough.

A crew of 15 people guided the TBM into a 12 m deep underground station over a period of 24 hours.

It is the last time the machine will ‘surface’ before reaching its final stop at Bayswater Junction.

Grace will now undergo scheduled maintenance and be fitted with brand new screw conveyors, before continuing the machines journeys towards Bayswater.

TBM Sandy, following the completion of repair works on her screw conveyor mid-April, is not far behind and is close to reaching the 4 km mark.

A 32 m electric tower crane has been erected on site ready to begin lowering tunnel segments into the station box once the TBMs leave Redcliffe.

Multiservice vehicles will then transport the segments through the tunnels to the TBMs.

For more information visit the Forrestfield-Airport Link website.

If you have a project you would like featured in Trenchless Australasia contact Assistant Editor Chloe Jenkins at cjenkins@gs-press.com.au

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