SECTOR REPORT Ӏ CRAWLER CRANES
this year added the LR 1130.1 and LR 1160.1 to cover the 100-200t capacity range. These are not impractical experimental models just for show: Select Plant Hire, the crane hire division of Laing O’Rourke, for example, has its fleet of Liebherr electric crawlers currently at work on sites for HS2, the UK’s huge and important rail infrastructure project. Visitors to this year’s Bauma will find Liebherr’s lattice electric crawlers being joined by a teleboom offering from Sennebogen, in the form of their 653E Electro Battery. It is a 50 tonne machine equipped with a 210 kWh battery pack. It can work fully electrically on
have stayed recognisably similar. The tele-crawler is not so old: crane historian Stuart Anderson, a frequent contributor and advisor to this magazine, tells us that the first manufacturer to put a telescopic boom onto a crawler undercarriage was Grove in 1967 with its 25USt (22.7t) 225-T; UK company Coles Cranes followed a year later. Other types of lifting gear can also be set on top of a crawler chassis: Liebherr for example has its R-series of fast-erector cranes – see page 42 – on just such a mounting. For all its near-standardised outlines crawlers are, like all other cranes, developing. Digital control and safety systems are becoming standard. Liebherr, for example has its Gradient Travel Aid for the safe negotiation of slopes and inclines. The crane’s control system automatically calculates the centre of gravity and warns the operator before the crane leaves the safe area. While travelling, the operator receives information about the permissible and actual gradient and the crane's overall
Sennebogen’s all-electric 653E Electro Battery
centre of gravity at all times. The system is available for all the company's crawlers. But the big technological advance in crawlers just now is electric power. Liebherr’s 200t capacity LR1200.1 ‘Unplugged’ lattice crawler, introduced in 2021 has been well covered in this magazine. There is also an LR 1250 version, and to these Liebherr has
any type of construction site and for an unlimited period of time. This is because, like Sennebogen’s battery-powered material handler 817 Electro Battery already on the market, the crane can be operated both in battery-only mode and while charging from the mains. As soon as the machine is connected to the mains, the mains power is used for lifting activities and any excess power fed into the system simultaneously recharges
f Continues on page 64
Maeda’s CC 1485 minicrane, again all-electric, is powered by Deutz
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