Ellwanger Berge
The challenge
Erecting a wind farm with support from Prangl
In Baden-Württemberg, right alongside the A7 motorway, a wind farm is currently being constructed with Prangl’s support, consisting of ten wind turbines, each with a hub height of 149 metres and a rotor diameter of 115 metres. The nominal output for such an installation is 3 megawatts. The ten turbines are capable of supplying more than 16,000 households with green energy each year.
Our solution
The stars: a 600-tonne and a 650-tonne crawler crane
The specialists at Prangl are represented on site by two large crane teams, who are responsible for the proper installation of the wind turbines. One 600-tonne and one 650-tonne crawler crane from the latest generation are deployed. Each team is supported by their own 200-tonne auxiliary crane and 6-tonne telehandler. An 80-tonne telescopic crawler crane also had to be used on a few of the turbines. For this application, a conventional telescopic crane would have run up against the limit of its capacity.
Components with individual weights of up to 65 tonnes
Two steel sections weighing up to 55 tonnes have to be lifted for each turbine. The heaviest components are the two nacelles, which weigh up to 64 tonnes each, and the two hubs, which weigh up to 65 tonnes each. As the wind farm is located in hilly, wooded terrain, extremely tight space constraints make assembling and disassembling large cranes very challenging. A few trees had to be felled at short notice, in coordination with a local operator, because erection of the turbines would otherwise have been impossible.
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