CC 3800 Crawler Cranes Remove Rotor Blades from Wind Turbine
On behalf of Enercon, Belgian crane service provider Aertssen Group NV removed the rotor blades from an Enercon E-126 wind turbine at a height of approximately 136 m for maintenance. However, what may sound like a routine job was actually a tricky challenge, and it was only the team’s extensive experience and a pair of CC 3800 lattice boom crawler cranes that enabled them to successfully carry out the corresponding lifts.
“Before anything else, we had to decide which crane to use for the job,” reports Peter Bertels, Aertssen project manager. After all, there were 2 options available: either a large crane that would be able to take care of the lifts by itself or 2, more compact, cranes that would tackle the lift in tandem. Ultimately, the team decided on using its own CC 3800 cranes, as they were more cost-effective, would be powerful enough when used together, and had the required reliability and precision characteristics for the lifts. However, it was first necessary to make sure that the ground bearing capacities at the work site in Estinnes would be sufficient for the 2 crawler cranes, as they had originally been calculated back when the wind turbine had first been erected, for the use of a single crane only. Once the green light was given though, nothing else stood in the way of using the 2 units.
A total of 52 truck runs across a distance of approximately 130 km were needed in order to get the 2 cranes from the Aertssen Kranen branch in Stabroek to the work site. Once there, a 5-person team set up the cranes within a week.
“The reason is that even though we’d installed cameras on the spreader beams, our crane operators were operating remotely, and were therefore unable to determine whether the slings were at the right height. It was kind of like lassoing a tiny animal,” explains Mr. Bertels.
One week later after the required maintenance was complete, the rotor blades were reinstalled on the wind turbine.
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