Legacy Way

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 GHD delivered detailed design services to the construction joint venture for Brisbane’s AUD1.8 billion Legacy Way road tunnels over a period of five years. The tunnels link the Western Freeway at Toowong with the Inner City Bypass at Kelvin Grove.

By completing a missing link in Brisbane’s road network, Legacy Way will distribute traffic from local and arterial roads onto motorway standard roads. The project includes 5 km long twin tunnels that will be bored by two 12m diameter Double Shield Herrenknecht Tunnel Boring Machines (TBM). The twin two lane tunnels are supported by a permanent segmental fibre reinforced concrete lining which was installed within the tail shield of the TBM.

GHD was responsible for the design of the support for the TBM tunnels, which included standard segments comprising Steel Fibre Reinforced Concrete for the majority of the tunnel length while “heavy” segments were utilised at cross passage and substation penetrations. These “heavy” segments contained additional rebar reinforcement and cast in fixings to facilitate temporary support of the lining to enable break-out for the cross passage.

The project also included the construction of a 550m long conveyor tunnel excavated by drill and blast techniques. The conveyor tunnel linked the western portal of the main line tunnels to the Mount Cootha Quarry and allowed for the disposal of the excavated rock from the main TBM tunnels. GHDs support design utilised a combination of steel mesh, fibre reinforced shotcrete, rock-bolts and steel sets depending on ground conditions.

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Drawing on our depth of international and Australian experience, GHD is well positioned to provide routine design as well as expert services for all phases of tunnel and underground space projects.

Our people have worked on some of the most iconic tunnel projects in Australia and around the world. We continue to push technical boundaries and have achieved key milestones and optimum outcomes in soft soil to hard rock environments. Our experience has grown through the delivery of award winning technical solutions to both contractors and client organisations in Australia and internationally.

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