SECTOR REPORT Ӏ RESIDENTIAL CONSTRUCTION
increasingly demanding the use of low- or zero-carbon equipment. The two leading manufacturers of lightweight boom cranes sold internationally – Klaas and Böcker – have both been focussing on this over the last year.
FULLY ELECTRIC TRUCK CRANE At Bauma, Böcker introduced its first fully electric truck crane, the 6t maximum capacity AK 48e. Mounted on a Mercedes eActros truck, with a gross vehicle weight of 27 tonnes, it can travel to site and work, all powered by a 336 kWh battery with electric power take off (ePTO) for the crane. That’s enough charge to travel up to 300km. On the way to Bauma, the
electric truck crane was driven the 720km from the Böcker factory in Werne, near Dortmund, to Munich, by Jörg Mehllage. The Böcker employee was able to find charging locations en route, using an eMobility app. The journey shows that electric truck cranes like this can be used for jobs far from the depot. In typical operation, though, this should be plenty for taxi operations, with charging at the depot. The crane can also be mounted on a standard diesel carrier, with a more traditional PTO, or as a hybrid, with a 400V motor. The crane also features an
innovative structure and geometry. The main boom can be angled at 180°, to offer all the advantages of a mobile tower crane. With the boom positioned straight up, and
the jib extending perpendicularly, this allows the crane to lift loads of up to 1000kg up and over rooftops. In this configuration, it can reach a height of 34.7m, and out to 14.4m, with an additional 3m available on the extension jib.
BATTERY-POWERED LIFTING Klass has also launched its first truck crane with battery-powered lifting, the K700 E. The base K700 offers a standard capacity of 1.6t, with an optional increase to 3t, a maximum hook height of 34.5m and maximum reach of 30m. It is designed for mounting on a small, 7.5t two-axle truck. Once on site, the K700 E
allows for emissions free lifting, through the addition of a 24kWh lead battery and a battery- operated electric motor. Power use is optimised to allow for a full day of lifting operations without recharging. When it is time to recharge, the crane can do so from a standard 230v power point, and this is enough to fully charge the crane overnight. Like many boom trucks, the K700 can be fitted with a platform. In this mode, five hours
Heiße using its
Böcker AHK 36e in Bad Wünnenberg, Germany
of continuous operation can be achieved from the battery. As electric cranes do not waste energy idling, this again, in effect, amounts to a full day’s working. An alert system warns platform operators when the battery is running low.
ELECTRIC TOW AND GO As well as truck cranes, both companies also offer trailer versions, and these too are now being offered with the option of electric power. Klaas offers two models, the K280 E, launched in 2022, and the K 350 E, launched in March. A diesel electric hybrid option is also available on the K22-33 RS.
The K280 E offers a load
capacity 800kg, with a reach of 18.5m and lifting height of 19m. When arriving on site fully charged, it can be unhitched and travel to its working location under its own power. For users looking for a higher
capacity option, Klaas this year launched the K350 E. This offers a maximum capacity of 1.6t, with a reach of 32.8m and maximum hook height of 31m. The
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