Crane erection site on the dike completed in 2017

The most impressive phases of the refurbishment, however, were the hoists of the lock gates, which are as tall as houses. A site with thick concrete foundations was built for the powerful lattice boom crane last year on the sea side edge of the dike. From there, the LG 1750 had to hoist the massive gates out of their anchorings over the barrage building and place them in a frame on the bottom of the drained dock chamber for the refurbishment work. The 12 metre wide and 16 metre high gates meant a load of 101 tonnes on the hook block and lifting equipment.

To handle this load case at the enormous radius of up to 67 metres, the LG 1750 had been erected with a 49 metre lattice boom, a 56 metre luffing jib and the derrick boom. 570 tonnes of ballast provided sufficient counterweight for hoisting the steel gates.

High pressure cleaning – tonnes of oysters and mussels are jetted off the gates.

Site manager Jürgen Peters: “The Liebherr LG 1750 was the ideal crane for this job.”

The crane job on the Büsum barrage was far from routine as a result of the load case and the radius, together with the very constricted available space. “The LG 1750 was the ideal crane for this job because the slewing range for the derrick platform was very limited,” explains Jürgen Peters, who planned the job and is responsible for major crane jobs at Nolte. At the beginning of June, he and his team completed the work smoothly and on schedule. Six weeks after the start of the 2.5 million euros refurbishment of the barrage, all the lock gates had been reinstalled.

There were cranes and construction machines from three divisions of the Liebherr Group in action on this site in Büsum. The mobile construction crane comes from the Liebherr Plant in Biberach/Riss in Swabia. The modern telescopic loader was manufactured in Telfs in Austria and both the LG 1750 lattice boom crane and the 200-tonne mobile crane were manufactured at the Liebherr Plant in Ehingen.

Credits : Liebherr