The first of the two giant Tunnel Boring Machines (TBMs) excavating Brisbane’s Cross River Rail’s twin tunnels has now carved its way beneath the river, and is moving northwards under the CBD
Premier Annastacia Palaszczuk said the successful under river crossing by TBM Else is a major milestone for this transformational project.
“Else was now tunnelling its way towards the new Albert Street station, while TBM Merle was making her own crossing to ensure the twin tunnels break through to Roma Street, then onto the Normanby portal by the end of the year.
“Not only is this project streamlining our public transport network, it is also a vital part of our economic recovery.
“Everything about Cross River Rail is big,” Ms Palaszczuk said.
‘When so many work sites around Australia shut down last year because of the coronavirus threat the tunnel project fired up.
“It is putting more than $4 million a day into the economy and more than 2400 people have worked on the project since it started.”
“When trains start running to parts of the inner city in 2025, more than 7700 workers, including 450 trainees and apprentices can boast they had a hand in building the project which will re-define peoples journeys to parts of the inner city.”
Transport Minister Mark Bailey said Cross River Rail will change the way we travel to, from and through Brisbane in the future, and it is creating 7, 700 jobs for Queensland.
“While progress above ground around the surface of the 2-hectare old Brisbane Transit Centre site at Roma Street is impressive the tunnelling work out of sight and underground is breathtaking.
“The big boring machines are tunnelling through up to 30 metres of hard rock a day with a crew of up to 15 people working on them at any one time.
“The TBMs are lining the tunnel walls as they go with 25,000 big precast concrete segments, weighing 4.2 tonnes each,” Mr Bailey said.
“The big project is a key component of the Palaszczuk Government’s $56 billion dollar infrastructure guarantee over the next four years to drive Queensland’s economic recovery from Covid-19.”
This adds to the $1 billion Gympie Bypass, the $514 million Bruce Highway upgrade south of Townsville, the $480 million Bruce Highway upgrade south of Cairns, the $194 million Bruce Highway upgrade north of Rockhampton, and the $150 million Walkerston Bypass near Mackay.
Member for McConnel, Grace Grace said the project is delivering a huge economic boost to Queensland.
“Cross River Rail is injecting about $4.1 million into the economy every day, with more than 90 per cent of this flowing directly into Queensland businesses, at a time when they need it the most.”
Ms Grace said the exciting milestone of crossing under the river was also one of the most technically challenging parts for crews.
“As you could imagine, burrowing under the Brisbane River with two 1350-tonne mega machines has required extensive planning,” she said.
“Crews undertake probe drilling in front of the TBMs to determine the type of geology they will pass through, while special systems on the machines and the design of the tunnels themselves ensure this new river crossing will be watertight.”
Mr Bailey said the mega machines would continue below the Albert Street site before breaking through at Roma Street later in the year and then finally emerging at the project’s northern portal near Normanby by the end of the year.
“The sheer scale of work happening on this transformational project both on and below the surface means great benefits for the state now and into the future,” he said.
To track the progress of Cross River Rail’s TBMs and roadheaders, visit the project’s website.
Cross River Rail tunnelling fast facts:
- Cross River Rail’s twin tunnels will be the first rail crossing for the Brisbane River since the Merivale Bridge opened in 1978;
- The two TBMs are named in honour of two ground-breaking Queensland women – trailblazing engineer Else Shepherd AM and pioneering feminist Merle Thornton AM;
- Each TBM weighs 1350 tonnes and is 165 metres long;
- A crew of up to 15 people will work in a TBM at any one time;
- TBMs work at a rate of 20 to 30 metres per day;
- TBMs excavate the bulk (about 3.5km) of Cross River Rail’s 5.9km of twin tunnels, with the rest excavated by road headers;
- The TBMs will install 25,000 concrete segments weighing 4.2 tonnes each along the tunnel walls as they go;
- At their deepest points, the tunnels will be 58 metres below the surface at Kangaroo Point, and 42 metres below the Brisbane River;
- Each TBM is fully equipped with crew facilities, offices and toilets;
- The TBMs will generate 315,000 cubic metres of spoil as they make way for the twin Cross River Rail tunnels.