Wind Turbine erection: 2 cranes working together

To lift the biggest component of the WTG, such as the tower segments or the blades, two cranes are used at the same time.

A principal crane, normally a Liebherr 1600 or a Demag CC2800, is helped by a smaller crane, often a rubber-tired rough terrain crane, for instance a Terex RT1120.

Both cranes start lifting the component at the same time – for instance in the attached pictures you can see how they hold a segment of tower.

Then, when it is a few meters above the ground, the secondary crane stop lifting the component while the principal crane continues the lift: doing this manoeuvre, the tower is rotated 90 degrees and can be positioned.