MODULAR CONSTRUCTION Ӏ SECTOR REPORT
cranes to be tied and climbed
to feed the slipform construction – freeing them up to construct the structural steelwork. Avoiding tying and climbing minimises weather delays and disruption to lifting every time a new tie and mast section is added. Another tower that's been built using the slipform construction technique is part of the construction of the world’s largest high-voltage offshore power cable factory in Karlskrona, Sweden. Once contractor Skanska completes the NKT Tower 3 it will be the second tallest tower in Sweden standing at 200 metres. Two Liebherr tower cranes
were used on the job: a 542 HC-L 12/24 Litronic and a 258 HC-L 10/18 Fibre. The work had a tight
deadline, of just 90 days, and the cranes were used in a shift system enabling the tower to rise by 2.6m a day. This meant that it reached its full height after just 90 days. The 542 HC-L reached a final
tower height of 210m, whilst the 258 HC-L Fibre reached 213m. The cranes were provided by
NessCampbell’s
Grove GMK6450-1 carrying out tilt-up work in Marysville, Washington, USA
Liebherr’s Tower Crane Center (TCC), from its rental fleet. “To secure 24/7 operation, we moved key spare parts such as a new fibre rope and various modules directly onto site in advance so that time wasn’t lost if these were needed,” said Stefan Gröber, head of TCC Used & Rental. In addition, Tower Crane
Solutions (TCS), Liebherr’s project department for large and special projects, provided detailed
calculations for optimal tie-in geometry and made the required tie bars available through the Tower Crane Center. The climbing steps were also
carefully planned beforehand to ensure an efficient construction process. An optimal crane configuration, including hoist rope lengths, power supply and tower bracing, was put together specifically for the project. TCS also provided the structural data for foundation loading and tensioning forces and worked closely with the Tower Crane Center to coordinate tie-in geometries. This custom solution successfully met the project’s requirements and the project was completed within the timeline.
CONCRETE PLANS Another construction technique that, like slipform construction, utilises the fast-setting properties of concrete is tilt-up construction – where large concrete walls can be built by pouring them flat on the ground in situ, letting them cure, and then lifting (or tilting) them upright using cranes. The walls can then be secured in place. Like modular and slipform
construction the fast speed of construction is a key benefit here as the panels can be cast whilst site work continues. It is quite distinct from modular construction, however, as no transport to site is required. Here mobile cranes and telecrawlers come into their own. In the USA, for example, NessCampbell Crane + Rigging – a leading provider of crane rental, heavy rigging, and specialised transportation services in the Pacific Northwest – used the first Grove GMK6450-1 all terrain crane in the country for a tilt- up panel lift project with DKS Commercial Concrete Construction in Marysville, Washington.
18 CRANES TODAY
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