SECTOR REPORT Ӏ SELF ERECTING CRANES
LiebheRR walks tall: fast erecting crane lifted onto rooftop job site
Liebherr call their range of self erectors ‘fast erecting cranes’ but the idea is the same: these cranes need no assist crane to set them up. They include the L1 and HM series, with unfolding masts, the K series, which has insertable tower sections, and the R series, which is available on crawler track travel gear so they can be set up and moved on any terrain. A Liebherr 34K fast-erecting crane worked this summer on one of the tallest residential buildings in Europe. It was in operation on the De Zalmhaven development project along the Maas in Rotterdam’s Scheepvaartkwartier district. De Zalmhaven has
three towers in total, of which Zalmhaven I, the tallest, has a height of 215 metres. Designed by architectural fi rms Dam & Partners and KAAN Architects, the project encompasses 452 apartments and penthouses, 33 town houses, a multi-storey car park, offi ces, commercial space, a roof garden and a restaurant with views of the Rotterdam skyline. The development is scheduled for completion in 2022. A Liebherr 34 K fast-erecting crane with a hook height of 20 metres had been in place on the roof of what will eventually be the restaurant
since mid-June. Its job, working at a height of 190 metres, was to dismantle part of the lifting platform which had been used during the construction of Zalmhaven I. The platform, covering the top of the construction, rose upwards along with the tower, level by level, as each fl oor of the tower was built.
It was practically a moving workshop, complete with fl oor, base, and overhead gantry crane, in which the engineers were able to work as they would do on the ground. Because of this concept, the Zalmhaven I site had so far managed without the use of a conventional tower crane. But when the tower reached full height the question arose of how the roof of the lifting platform could be dismantled. The crux was that the crane needed to fi t inside the lifting platform structure. The customer Civiele technieken deBoer bv was looking for a crane with the longest possible reach but that was also as compact as possible. An extra issue was that the space between the platform base and the overhead crane was extremely tight. How a crane could be assembled in such a confi ned space in the fi rst place also had to be addressed. The solution was a 34 K from Liebherr. Crane rental company Van der Spek Vianen B.V. recommended the fast-erecting crane as an effi cient
and straightforward solution. Measuring 3.5 metres in height when folded, the crane is small enough to fi t into the platform structure. And with a jib length of 30 metres,
it is large enough to be able to dismantle the roof without time-consuming relocations. With this information to hand, alternative lifting solutions were consequently discarded. The roof parts to be removed weighed between 1,200 and 1,500 kilograms. Assembly went smoothly thanks to extensive preparation including 3D simulation. First the overhead gantry crane on the lifting platform lifted ballast weighing more than 17 tonnes. This was followed by the 34 K, weighing in at 15 tonnes. The overhead crane is capable of lifting up to 23 tonnes at a time. Next day the ballast was mounted and the crane unfolded itself above the rooftops of the city. It was positioned where the platform was open
at the top so that the crane and its jib could protrude above the roof. Its dimensions mean the crane fi tted perfectly through the gap in the roof of the structure. When the assignment was completed in mid-July, the overhead crane returned the 34 K to the ground. The K series is designed primarily for projects such as the construction of single-family homes and apartment blocks. To set it working on the tallest skyscraper in the Netherlands was an assignment that had its own particular appeal due to the extraordinary height involved.
CRANES TODAY 49
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