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Contractors World International - 2015 Vol 6 No 1

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First trial - Liebherr 1000 EC-B 125 Litronic Flat-Top crane erects wind turbineFirst trial - Liebherr 1000 EC-B 125 Litronic Flat-Top crane erects wind turbine - page 2

The new Liebherr 1000 EC-B 125 Litronic was recently used to erect an Enercon wind turbine in Wardenburg in the Rural District of Oldenburg of Germany. With a lifting capacity of 125 tonnes, this Flat-Top crane is the largest crane in the Liebherr Tower Cranes Division product range.

The 1000 EC-B was first used in North Germany.

The Flat-Top crane was used to erect an Enercon E-101 wind turbine with a hub height of 135 m. Customers have recently reported good experience with erecting wind turbines using the 630 EC-H 70 Litronic crane adapted to this application.

The lifting capacity of the new crane is 125 t in the six-line version or 100 t in the fourline version. The Flat-Top crane can reach the required lifting height of 149 m for the project with a single guy on the tower of the wind turbine. It can operate in freestanding mode for such projects up to a lifting height of 108 m.

Logistic benefits for transport and erection

The use of this tower crane is particularly beneficial for remote locations as both the crane and the wind turbine can be erected on a comparatively small area.

The area requirement for erecting the complete crane is approximately half of the normal standing area of other crane systems. In addition the logistics required to transport it are much less than comparable crane systems since the various components are supplied in smaller packages.

The jib parts of the large crane can also be transported inside the tower elements.

1000 EC-B 125 Litronic flat-top crane erecting an Enercon wind turbine with a hub height of 135 metres.

1000 EC-B 125 Litronic flat-top crane erecting an Enercon wind turbine with a hub height of 135 metres.
Here assembling the nacelle at a 135 m height.

An adjustable undercarriage with a support base measuring just 18.0 m x 18.0 m was designed for the 1000 EC-B specially for Enercon. The support struts can be adjusted on this special undercarriage from the 45° position by +/- 5° or +/- 10°.

The support base is then 20.4 m x 15.2 m. This means that the crane can be moved closer to the object when there is little space available. For this job the 1000 EC-B 125 Litronic was used on the undercarriage measuring 18.0 x 18.0 m.

It was erected for this project on the 1000 HC tower system with conical bolt connections. The monoblock tower section with system dimensions of 3.40 m x 3.40 m and a length of 5.80 m allow high freestanding erection heights with short erection times.

Initially the crane was erected using a mobile Liebherr LR 1200 crawler crane to a basic hook height of 38 m. After this the crane climbed itself to a free-standing hook height of 108 m.

In the second stage the Flat-Top crane was guyed to a level of approximately 87 m using the wind turbine tower.

The guying solution, patented by Liebherr, was used to securely anchor the crane to the tower.
After guying the tower the tower cane climbed quickly and safely using the completely new climbing equipment in stages of 5.8 m to the required final hook height of 149 m for installing the nacelle and the rotor blades.

Wind turbines generally have harsh wind conditions so one benefit of tower cranes is their operational safety in wind speeds of up to 18 m/s. When the wind reaches a speed of 120 km/h or more, the jib has to be released to turn freely.

The infinitely adjustable crane drive units ensure high working speeds whilst MICROMOVE ensures that concrete rings, nacelles and rotor blades can be positioned and set down with millimetre precision.

The crane driver has the perfect view at eye level with the nacelle. This makes it easier to position the rotor blades precisely and safely using the trolley jib.

Liebherr-Werk Biberach GmbH

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