Windpark, part 2

The challenge

Construction of five wind turbines

Prangl was already responsible for unloading and transporting five wind turbines 700 kilometres from the port of Zadar in Croatia to Ivan Sedlo in Bosnia and Herzegovina. However, this was by no means the end of this major order. The specialist team was also to take care of the pre-installation and main assembly of the systems.

Our solution

Coordination on the construction site

Optimum coordination on the construction site was of the utmost importance. The components of the wind turbines, which were ultimately to reach a hub height of 102.5 metres, were unloaded piece by piece at the construction site by the Prangl team using a 160-tonne and a 250-tonne telescopic crane. The heaviest parts were tower segments weighing 65 tonnes and the longest were the rotor blades at 72 metres. Interim storage had to be organised in such a way that the cranes could pick up the components in the correct order and that there was also enough space for the necessary pre-installations.

Pre-installation

Then the delicate erection of the turbines could begin: The various components were pre-installed using a 500 tonne and a 250 tonne telescopic crane. First came the assembly of two tower sections. These were then lifted into place and firmly anchored by a 600 tonne lattice boom crane and a 160 tonne telescopic crane in a tandem lift. The remaining three tower segments were pre-installed on the ground and then lifted into place, thus completing the wind turbine tower. Everything was now ready for the next step.

Maximum precision

Next came the lifting of the nacelle, drive train and hub. They were lifted with utmost precision, one after the other, by the lattice boom crane. After these delicate installations at dizzying heights, all that was missing were the rotor blades. These were carefully lifted one by one by the yellow main crane and a telescopic crane and positioned with millimetre precision. One wind turbine after another was completed. With the support of Prangl, the new Ivan Sedlo wind farm is now set to produce enough electricity to supply more than 26,000 households from 2025 with a total output of 25 megawatts.