Lifting components of up to 61 tonnes to a hook height of 90 metres, a Liebherr LTM 1750-9.1 mobile crane recently helped a German company erect five wind turbines in five weeks.
The wind farm in Dagebüll, Germany, near the Danish border, is being built by Kran Saller of Bavaria.
Kran Saller says that the LTM 1750-9.1, which it bought in 2014, “has already excelled on many occasions with its high capacity and efficiency for the erection of wind turbines”.
The 9-axle mobile crane has a maximum hoisting height of 154 metres and a maximum radius of 112 metres.
Each of the wind turbines manufactured by Senvion has a capacity of 3.4 megawatts and consists of seven components.
“The heaviest component at 61 tonnes net weight was the rotor star which had to be installed at a hub height of 80 metres,” Liebherr says. “The LTM 1750-9.1 hoisted this load to a hook height of 90 metres with a radius of 20.5 metres.
“To tackle this job the 750-tonne Liebherr mobile crane was equipped with telescopic boom guying, a 15-metre V2 telescopic boom extension, a 35-metre luffing jib and 144 tonnes of ballast.”