TECHNICAL | CONCRETE


Above: Brisbane’s Cross River Rail project had a concrete truss lift challenge underground


CROSS RIVER TRUSS LIFT CHALLENGE


Mammoet’s heavy lift work helped get concrete trusses in place for a below ground station on Cross River Rail project, in Brisbane, Australia


The confined and congested urban space in the heart of Brisbane has brought many construction challenges for the city, including for the Cross River Rail Project, the latest major addition to the metro network. Logistics and sequencing of steps becomes ever more important, and the possibilities for using off-site fabrication or precasting – and then, of course, those elements need to be threaded through the city and carefully slotted into the spots they need to go. Recently, the challenge on Cross River Rail that faced local contractor Kenny Construction was to get 59


28 | July 2023


large, heavy, concrete trusses to the site and where they needed to go, placed within the space of a below ground station excavation. Each truss has a span of 17.6m and some had a mass of up to 70,000kg, although most were 48,300kg. While getting so many concrete trusses to site


sequentially was a fair enough challenge in itself, once on site then the transport solution for the precast units had to contend with restricted headroom and slim gaps of clearance – only 100mm on either side – to the side walls.


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