Liebherr’s four-axle 120-tonner20 March 2020
At ConExpo, Liebherr launched a new four-axle crane that offers a capacity of 120t (135USt), a nominal capacity of 20t more than any rival in its carrier class. The company claims that, with its 66m main boom, the LTM 1120-4.1 can take on some jobs that would previously have required a 200t crane.
Liebherr stressed the crane’s lifting capacity with its boom fully raised, saying that its ability to lift 9t at its full 66m boom extension will make it ‘ideal for erecting tower cranes and radio masts’. Lattice extensions enable the crane to achieve hook heights of up to 94m and radii of up to 64m. For this a 7m lattice boom extension is installed as well as a 10.8–19m double folding jib, which, as an option, can also be hydraulically adjusted between 0° and 40°. A 2m erection jib and a runner, which can be swung to the side, round off the equipment list.
The new LTM 1120-4.1 can tackle jobs which normally would require a five-axle crane, eliminating all the logistics work needed for the larger model. Because a four-axle crane delivers benefits in terms of licensing and route permits, Liebherr says, it can tackle jobs faster and with greater flexibility. The design of a four-axle crane also enables it to work where there is insufficient space for larger cranes. On constricted sites, in particular, Liebherr’s VarioBallast and VarioBase innovations deliver enhanced performance, flexibility and safety for this new crane model.
The maximum of 31t of ballast is distributed so variably that in addition to the 12t axle load version, uniform axle loads of 13.5, 14.5, and 16.5 t can also be achieved. That means benefits driving on construction sites and in countries where higher axle loads are permitted.
Alongside the new LTM from Liebherr’s Ehingen factory, a new version of Liebherr Nenzing’s popular 300t crawler was shown for the first time in the US. The crane offers a range of technologies to make work safer in situations where risks are higher.
Launched at Bauma, the LR 1300.1 SX offers a new ‘Boom-up-and-down aid’ that helps operators monitor the crane’s tipping load during set-up, warning if the crane approaches the tipping moment and helping them recover it to a safe position.
Sensors on the boom and jib measure windspeed, and in combination with data on the crane’s configuration, can warn when this reaches risky levels. At speeds of 10-16m/s, operators can downgrade lifting capacity to continue to work safely.Similarly, a new ground pressure visualisation monitors the crane’s ground loading and position, comparing it against known data on ground conditions, again allowing operators to work safely across the site.