Liebherr system uses second crane as counterweight
Liebherr’s LR 1600/2 crawler can now use the LTR 1220 as counterweight
Liebherr has launched a novel system whereby its LR 1600/2 crawler crane can use the LTR 1220 telescopic unit as a counterweight.
The system, which has been developed primarily for wind farm applications, means that less ballast has to be transported and handled during the erection process.
As the LTR 1220 acts as a ‘mobile counterweight’, derrick ballast can be reduced to just a few plates – or, in some cases, completely removed – during the actual hoist.
“Using the new method, the time-consuming ballast handling and transport of 280 tonnes of ballast is no longer required, since overall, 70 tonnes of ballast plates are required for use as suspended ballast,” explained Liebherr in a press release detailing the system.
“During the erection and lowering of the boom system, an additional LTR 1220 telescopic crawler crane was used as a counterweight, attached to the telescopic boom using an adapter.
“The crane and ballast plate are attached to the derrick jib using a cross beam with strap loops. After the erection process, the telescopic crawler crane is detached again. The remaining 70 tonnes of derrick ballast can now be used to hoist the load, for example, a machine housing,” the crane manufacturer added.
During the erection process, the LTR 1220’s hook block remains reeved. This means that the telescopic crawler can be used shortly after it has finished acting as the LR 1600/2’s counterweight.
Liebherr’s latest erection concept can be used for all long-boom systems up to a length of 156m with a 12m fixed jib. This applies to the recently launched SL10 and SL13 systems, as well as the existing SL4 system.