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T

he new Liebherr 1000 EC-B 125 Litronic was re-

cently 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 tur-

bines 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 four-line 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 re-

mote 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 trans-

port 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.

An adjustable undercarriage with a support base meas-

uring 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 tow-

er 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

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.

Page 13

Contractors World International Vol 6 No 1