Global heavy lifting and transportation specialists Mammoet have aided Queensland company Kenny Constructions in the lifting and shifting of 59 concrete trusses.
Completing the lift for Brisbane’s Cross River Rail project, Mammoet’s logistical prowess was sourced by the civil engineering contractor to help install the trusses in a deep, underground station cavern.
The trusses, weighing up to 70 tonnes each and spanning 17.6 metres, needed to travel a distance of 150 metres to the far end of the cavern – which held a width of 17.8 metres itself – before they could be installed.
The main challenges in this lift and shift installation for Mammoet were the limited clearance in the cavern, meaning limited headroom and clearance around the trusses, and the short timeframe in which the project needed to be completed to minimise disruptions.
Identifying the impracticality of using cranes in a confined area, the Dutch-based logistics specialists suggested it used a custom packing structure perched on SPMTs, facilitating the transportation and installation of four trusses simultaneously.
After enacting a series of dry runs to physically confirm what had been planned, a tower crane provided by Kenny Constructions lowered the trusses onto the packing structure. From there, Mammoet installed the first 55 trusses weighing 48.3 tonnes each, before placing the four extra-large 70 tonne trusses in the second part of its operation.
After completing the job in 15 rounds of loading, lifting, and installing, Mammoet’s praises were being sung by Project Manager at Kenny Constructions Fergus McHugh.
“This was a challenging scope of work, yet everything went according to plan,” he said. “Working with the Mammoet team was a pleasure. We made the right choice.”
The $5.4 billion Cross River Rail project will add four new underground stations with 10 kilometres of new rail line and 5.9 kilometres of twin tunnels under the Brisbane River and CBD.
Set to reduce peak hour travel times by 24% and facilitate an extra 9,000 daily passengers, the infrastructure project is designed to support the projected 40% population growth in South East Queensland.