SECTOR REPORT Ӏ TELECRAWLERS
SENNEBOGEN REPLACES TOWER CRANE AT THE TOUCH OF A BUTTON
A Sennebogen telecrawler has performed the functions of a tower crane on a site in the French riviera. A new, nature-oriented residential complex in the municipality of Hyères les Palmiers is being constructed by Comet Paca, a major company specialising in detached houses and apartment blocks. Local regulations prevented the use of a tower crane on the entire con-struction site so it used a Sennebogen 683 E telecrawler, supplied and operated by French transport, lifting and handling specialist M&S Translev, instead. The telecrawler carried out the shell construction work. It handled all
the lifting work in one part of the construction site and fulfilled the transport requirements for the three four-storey building complexes. The Sennebogen 683 E was used to lift common precast elements,
conventional and insulated blocks, concrete buckets, rubble, plus conventional building components such as columns, beams and formwork. It has a 42 m full-power boom, so can cover a large working area to ensure
the simultaneous construction of all three buildings. The crane is positioned in the centre of the site and moves on its crawler tracks as required to meet the needs of each team. Moving and telescoping under load over the entire length of the boom is no problem at all. A high-capacity tower crane would normally be used on such construction sites. Using a telecrawler in its place is unusual, and the way in which it was used was also different: it was entirely controlled by radio. Moving (with or without a load), lifting and positioning were all controlled
remotely. Sébastien Greuzard, managing director of M&S Translev, was the operator. "It is unique that I can operate the crane precisely with radio control. I can carry out lifting operations and position the loads precisely by being right next to the workers in the assembly areas. I can be on the ground or in the working area on the floors of the buildings." The increased safety is an essential element that was also highlighted. As the teams on the construction site put it: "With this working technique and thanks to this crane, the operator has the entire working area of the machine directly in view. Manoeuvres are much safer when the crane operator is operating close to his colleagues instead of blindly with a radio link or a camera."
A video of the job can be seen here:
https://youtu.be/BIALm1IXvBE?si=EVnMIdv5qUTbuf_O
38 tonnes and a width of only
three metres. To transport the crane without the crawler carriers a jack-up erection support, consisting of four swivelling cylinders, is required. This supports the crane on the ground while the tracks are removed and the low-loader positions itself under the crane. This method has been tried and tested with Liebherr’s 100-tonne LTR 1100. The LTR 1150 also has a new
automatic support system to assist the operator. Liebherr says this was developed to allow faster and easier assembly and disassembly of the crawler carriers. The two crawler carriers,
each weighing 11 tonnes, can be transported together on a standard semi-trailer with an economical width of 2.55 metres. The integrated access steps are folded in during transport. Ballast distribution has been
carefully thought out. The entire counterweight can be ballasted on the crane with only four lifts: two lifts for the two 11-tonne central ballasts and two for the maximum slewing platform ballast of 41 tonnes. As with the Liebherr LTM cranes, this is attached to the slewing platform using a hydraulic ballasting device. Liebherr-AutoBallast is designed to support the crane driver during
this process. The support for the slewing platform ballast is integrated in the central ballast. Liebherr’s VarioBase variable
supporting base system is well- known. The LTR 1150 is its first telescopic crawler crane to be equipped with it. It determines the optimum load capacity in real time taking into account the fixed track width and the variable rotation angle. The company says that not only does it provide greater safety for telescopic mobile cranes but also allows significantly higher load capacities, especially for lifts directly over the supports. Liebherr says the greatest advantages in terms of load
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