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The Single-Line Guiding System From Liebher (11-12-2018)
The blades on the latest generation of wind turbines are nowadays installed individually using rotor blade yokes. Liebherr has developed a system for this future-oriented application, which makes the installation process safer, more economical and in many cases also greener – the SLGS single-line guiding system.
To stabilise long rotor blades in the wind, helpers have had to be used on the ground with vehicles and, in some cases, even rope winches, to control the blades using long ropes. This requires a great deal of space on the ground as the force needed can only be generated if the ropes are spanned at an adequately low angle. For erecting wind turbines in forest areas, this means that more trees have to be felled than the component sizes of the crane and turbine components themselves would actually require. None of this is required if the new Liebherr SLGS is used as the blades are stabilised in the wind by the crane’s main boom.
The single-line guiding system is a system which is attached to the main boom on the side facing the load. A rope is secured at the top of the boom head and tensioned using a rope winch below in the pivot section. A cable pulley with two connections to the outsides of the rotor blade yoke runs along the boom rope during the hoisting process. With its own power supply in the yoke, the two connections to the SGLS are tensioned so that the blade is stabilised in the wind and can also be moved into the correct angle for installation on the hub. Since the horizontal application of force on the blade by the main boom is perfectly aligned, the SLGS significantly improves the load control during the blade installation.
The single-line guiding system from Liebherr can be used with rotor blade yokes from various manufacturers. Crane operators can retrofit the SLGS on all conventional wind power boom systems, including the new SX systems on LR 1750/2 and LG 1750 cranes at low cost, with the tensioning winch being installed instead of the luffing jib adjustment winch and the existing hydraulic system being used. Only the electrical system and software are added.
Mammoet Germany has taken the first 55 tonne Demag AC 55-3 All Terrain crane to be delivered in the country.
The three axle AC 55-3 features a 50 metre main boom, which can be lowered to five degrees below horizontal for easy rigging from the ground, while the flexible outriggers set up allows them to be positioned independently with the IC-1 Plus calculating the load chart based on the crane’s actual configuration. The company says it decided to purchase the AC 55-3 after the success the crane had with its Dutch division, and it will be used at BASF’s chemical plant in Ludwigshafen.
Repair manager Vitor da Costa said: “The main reason why we chose the Demag AC 55-3 is its outstanding lifting capacity. In addition, the AC 55-3 is an extraordinarily robust and reliable crane, as our Dutch colleagues have confirmed.”
Mammoet Germany’s new Demag AC 55-3
“We have a large number of cranes from Demag and Terex in every class, and every single project for which we’ve used them globally has been extremely successful, which is why we keep adding more.”
Established in 1991, Mammoet Germany is headquartered in Leuna, with other depots in Ludwigshafen, Krefeld, and Flensburg. The company is also opening a new depot this month in Hamburg.
Liebherr Cranes Make Expensive Floating Crane Use Superfluous (08-12-2018)
The Mammoet outlet in Leuna made quite an impression with a smart solution and the use of two large Liebherrmobile cranes on a site in Berlin. The positioning of lattice supports weighing around 80 tonnes for a future municipal railway bridge from just one side of the river made both financial and logistic sense compared to the use of a floating crane, which was also considered.
The installation of three lattice supports for the substructure of a bridge over a side channel of the River Spree proved to be a complicated logistical challenge as a result of the space available. One bank near the site could not be used for a crane as it was already home to a construction crane. Therefore, the contractor initially planned to erect the supports using a floating crane. However, as a floating crane was not available for some considerable time, the managers had to seek an alternative solution. The decision was made to adopt a suggestion by the crane specialists at Mammoet based in Leuna which plan to install the 40-meter lattice constructions from just one bank of the river. Furthermore, the crane job would not only be completed more quickly, the cost would also be significantly lower than the original floating crane version.
Because the company’s own mobile crane with a 1200 tonne lifting capacity was not available in the short term for the hoist, Mammoet planning staff René Xyländer and Tom Schladitz obtained a machine from Megalift based in Bremen to complete the demanding job in the German capital. This powerful Liebherr LTM 11200-9.1 mobile crane was fitted with a 48-metre luffing jib. This made it responsible for the hoists to the opposite bank and therefore for the large radii. The modern crane had to handle a gross load of 40 tonnes with a distance of around 50 meters. An LTM 1750-9.1 was assembled very close to it to take hold of the other end of the supports. Due to its significantly smaller radius, this mobile crane managed to operate with a smaller support base of ten by ten metres. In fact, there was no more space available at the extremely restricted assembly site.
The ends of the supports had to be placed under the existing structure
The steel lattice constructions were then swung over the water by the two Liebherr cranes with great care. The main difficulty involved the end phase of the hoists, as the ends of the supports had to be placed several meters under the existing bridge connection on the opposite side of the canal. However, Heiko Bischoff, at the controls of the more powerful crane, and the crane operators in the Mammoet machine, Rainer Schmidt and Daniel König, precisely followed the commands issued by the marshaling fitters and move the components accurately into their final positions.