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Demob of a Vestas V66 Windturbine

During my internship at Sarens NL among many other plans I made the lifting-plans for this project. The demob of a Vestas V66 windturbine. Because we didn't had any large crawler crane available we had to find another way, the solution was to errect the AC 650 and AC 700.

Both cranes were rigged with 120 tons of counterweight and 60m of fly-jib.

The cranes were placed at the same radius from the windturbine.

After some trouble to get the needed clearance between the nacelle and the tower the nacelle could start its way down. In the picture you can see clearly the jib-heads were placed on the wrong crane. This was done because the AC 700 came straight from France and it was the first crane to be rigged. The jibhead wasn't delivered one time and the jib-parts of the AC 650 were already delivered so they decided to use the boomhead of the AC 650 for the AC 700.

After the nacelle was safely on the ground the jib of the AC 650 was taken of while the AC 700 took of the top 2 sections of the tower.

The AC 650 lifted the last two, heavier, parts of the tower and the AC 700 was de-rigged.

After a long day of work the windturbine was taken down completely.

Just after the sun had set behind the horizon the last tower section was lifted.

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