Boom configurations

The boom system with the designation SX was developed for our 750-tonne lattice boom cranes LR 1750/2 and LG 1750 for erecting the latest generation of wind turbines. Turbines with a hub height of up to 165 metres and component weights of up to 127 tonnes can be erected using the SX system.

Before, these capacity data were the exclusive domain of cranes in the 1000 tonne class or above.

The new SX system differs from previous boom systems by the fact that 3.5 metre wide lattice sections are used in the bottom area of the boom rather than sections measuring just 3 metres wide. The extended lattice sections increase the lateral stability of the boom and therefore deliver a higher load capacity.

Furthermore, the weight of the lattice sections has been reduced.

An additional increase in lifting capacity is achieved by a particularly innovative extension to the SX system: instead of 3.5 metre wide lattice sections, two lattice sections each 14 metres in length (SX2 system) or three lattice sections each 14 metres in length (SX3 system) with a width of 6 metres are installed in the lowest area of the main boom.

This provides additional rigidity to the boom system, thus increasing its load capacity.

In order to install the 6 metre wide lattice sections in the boom, there is an extension adapter from 3 metres to 6 metres on the pivot section for the turntable. At the top the width of 6 metres is reduced to 3.5 metres by a second adapter.

When designing this system extension, we’ve focused on ensuring it was highly economical. This means that crane operators only have to buy the 6 metre wide sections and the adapters in addition to the SX system.

The so called WV heavy duty jib is assembled using components of the luffing jib. It delivers enormous load capacities and is used when real muscles are required.