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Germany

Inside job for two Terex City cranes

A demanding project awaited t wo AC 4 0 C i t y c r a n e s i n Hanover. It consisted of placing an 8.5 tonne overhead bridge crane on top of running rai ls located under a factory’s ceiling. Wh i l e th i s mi ght not seem particularly challenging at first glance, the fact that the l i ft operation had to be performed within mere inches of the ceiling proved otherwise.

The only alternative would have been to put the overhead br i dge c rane i n p l ace f rom outside, which would have made it necessary to remove the roof f irst. This was unacceptable, since i t would have entai led

Germany

Liebherr mixing tower produces quality concrete for wind power systems

For a special type of structure, an additional Liebherr mixing plant at WEC-Turmbau in Magdeburg produces quality concrete for prefabricated tower elements in wind energy systems. The idea behind making these tower segments out of cement did not occur untl 1999. Prior to that, these components, with exacting standards in terms of design and load bearing, were made from steel.

The prefabricated concrete towers in wind power systems are often more than 100 metres high and comprise over 20 different segments. The segments with a large diameter are made using two or three half-moulds to assure trouble-free transportaton to the assembly sites of the wind energy systems. EC-Turmbau in Magdeburg mixes 120,000 m³ of concrete every year.

For the series production of segments for prefabricated concrete towers, the concrete is made to precise mixture specifications and added according to a precise schedule. In Magdeburg, the choice was made for a Liebherr Betomat III-570 mixer.

The aggregate is conveyed via a bucket elevator and rotary distributor at a delivery rate of 140 m³/h. The storage volume of the four possible types of cement is 360 m³. The core of the system is a Liebherr RIM 3.0 D ring pan mixer with a mixing performance of approx. 120 m³/h.

This intensive mixer is equipped with a mechanical dual agitating system and therefore achieves the best mixing results in the shortest tmes. The link between the mixing system and the producton building is provided by a bucket conveyor, which supplies the fresh concrete at just the right tme to the correct mould in the producton building.

Click here for more informaton >>> Liebherr Betomax

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Page 7 Contractors World Vol 3 No 2

Page 7 - cw-3-2

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