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Two roadheaders are excavating tunnels underneath Brisbane to carve out the route of the future Cross River Rail.
The addition of the second roadheader enables more rock to be excavated each day, with 55 metres of tunnel already excavated at a rate of 1.5 metres each a day.
The over 100 tonnes roadheaders have set out in different directions from the Woolloongabba site. Beginning from the station cavern, one is heading north underneath Vulture Street, and the other is tunnelling south towards the South East Busway.
Blasting is also being conducted at the site to speed up excavation works.
To allow for the excavated rock, including volcanic Brisbane Tuff and conglomerates forming the Neranleigh Fernvale rock that sits under the Brisbane CBD, to be removed from site, a spoil shed built by a local contractor has been constructed at Woolloongabba. By the time excavation is complete, over 132,000 cubic metres of rock and soil will have been excavators. So far, 70,000 cubic metres has been removed.
When complete, the station box shaft will be 32 metres deep, with the future 220 metre-long platform sitting 27-metres below the surface.
Later in 2020, tunnel boring machines (TBMs) will arrive at Woolloongabba. The TBMs are currently being refitted in Brisbane after having completed work on the Sydney Metro project. The TBMs will excavate the twin underground tunnels to the north from January next year. This will speed up tunnelling progress as each can carve out 20-30 metres of tunnel a day.
This article first appeared on www.railexpress.com.au
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