Increased performance using derrick ballast
The use of derrick ballast as the counterweight enables lattice boom cranes to manage vastly higher load capacities. Liebherr develops and manufactures practical derrick ballast systems for a very wide range of applications.
Variable derrick systems
Derrick ballast: High load capacity in action
A Liebherr LR 11350 crawler crane moves a column weighing 740 tonnes. The required load capacity is made possible by 510 tonnes of suspended counterweight tray at a radius of 22.5 metres.
The increased counterweight radius with derrick ballast increases the load torque. This enables lattice boom cranes to achieve higher load capacities and greater working radii. The derrick ballast from Liebherr is available in the form of suspended counterweight tray or a ballast wagon.
The infinite radius adjustment makes the systems extremely variable. This means that on almost all models the suspended counterweight tray can be adjusted with the derrick boom without guidance whilst fully loaded. With a guiding frame the ballast wagon and suspended counterweight tray can achieve an even greater radius. This results in even higher load capacities. With a small radius the derrick ballast will adjust perfectly to a constricted working environment. If there is adequate space available, on the other hand, the increased radius enables ballast weights to be saved and higher load capacities to be achieved.
Proven technology focussing on safety
Derrick ballast from Liebherr has been proven in everyday use. The focal point in its development is the safety of the operating personnel. We design a whole range of safety equipment such as railing and access ladders to ensure this.
The ballast wagon for the LR 11000 features a whole host of railings and access ladders to ensure the safety of the operating personnel.
A Liebherr LR 1750 crawler crane with ballast wagon dismantles a motorway bridge. Using the derrick ballast as a counterweight increases load capacity.
To avoid collisions with obstacles the ballast wagon for the LR 1300 SX can be raised or lowered by around 1 metre using a hydraulic cylinder on the derrick head.
The ballast wagon for the LR 1750, shown here in driving position, can also be used on the smaller LR 1600/2. This benefits crane contractors who have both models in their fleet.
Two Liebherr cranes place the roof on the silo at a cement plant in a tandem hoist. The LR 1750 with ballast wagon in the foreground is fitted with 330 tonnes of ballast with a radius of 20 metres.
The 750-tonne LR 1750 is moving prefabricated concrete components. The suspended counterweight tray with hydraulically telescoping guidance increases the counterweight radius.
