SECTOR REPORT Ӏ HIGH-RISE CONSTRUCTION
The redesigned jib now has bottom chord connections that use bolts, and the jib sections, including the rope swivel traverse, are mounted on the front with a mandrel and wedge connection. In the top chord a change is that the pins are inserted into pear-shaped holes to make assembling it easier: it can now be done without using a hammer, says Wolffkran. The machine is equipped with a 45 kw hoist winch. It lifts a maximum of 8.5 tonnes in two-fall operation with a jib length of 30 metres, and 12.5 tonnes in four- fall operation with a reach of 21.5 metres. At maximum jib length of 65 metres it has a tip load capacity of 2.3 tonnes in normal operation and 2.5 tonnes with the activated Wolff Boost function. The jib can be extended from 30 to 65 metres in 2.5 metre increments. The crane comes with a combined UV 20/TV 20 tower connection which allows it to be mounted freestanding on a 2.0 x 2.0 metre tower of up to 69 metres. Using a 2.9 x 2.9 metre tower it can operate at 106 metres without tie-ins. The Wolff 6523 Clear will primarily be sold in Germany (D), Austria (A), and Switzerland (CH) – hence the DACH region in sales parlance - although a version with
a maximum payload of 10.5 tonnes in two-fall operation as well as an US version are being planned. The crane can also be specified with plastic fibre rope to replace the steel rope.
DIGITAL SOLUTIONS We mentioned digital technology and controls; well, Woffkran is onto it. HiSPS stands for Wolff’s new High Speed Positioning System; it premiered it at Bauma 2022. It is available as an option on the 6523 and, from the beginning of 2024, on other new Wolff cranes; and existing Wolff cranes can also be retrofitted. According to Wolffkran, HiSPS enables loads on the crane hook to be moved virtually sway-free and positioned with millimetre precision. The system operates using two
battery-powered sensors, one on the trolley and one on the block of the crane hook. Connected to a control unit in the switch cabinet, it detects the rope’s movements and automatically adjusts the motion and speed of the slewing gear and trolley to it. “Ultimately, the crane operator controls more than the crane – they control the load with assistance from the system,” says Viktor Mosolf, Head of the Digitalization Department at Wolffkran.
The HiSPS from
Wolffkran helps control loads
By activating the HiSPS, the load that was already swinging as a result of the crane movement is stopped within seconds. The system can also be used to eliminate heavy wind effects. Since the trolley always assumes
its position automatically via the hook block when HiSPS is activated, it prevents the load from being pulled diagonally: the trolley automatically moves so that it is always positioned precisely over the load when the hook is manually pulled or pushed by riggers on the ground.
The Terex
CTT292-12 flat-top
“HiSPS significantly reduces the risk of accidents and damage due to swinging loads or hooks,” says Mosolf. “And the anti-collision system is optimised, since not only the crane but also the load in the working range limitation is automatically stopped.” According to Wolffkran the HiSPS increases efficiency at the construction site as well as safety. Previously the crane operator had to move the load slowly to prevent a strong pendulum motion. With the system connected, users can move the crane significantly faster. The HiSPS also allows hook positions to be saved and automatically moved to. As a result, the load can be
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