Berger Grundbautechnik is using two Sennenbogen duty cycle cranes simultaneously for preparatory works for the planned BAB 100 motorway in Berlin.
The new stretch of motorway will connect the eastern areas of Berlin to the central road circuit and the BAB 113. Large sections of the section being built run in a tunnel or in a trough of up to 7m. Hard at it are the Sennenbogen 690 HD and the new 6130 HD units.
With a working weight of 130tonnes and two 300kN free-fall winches, the 6130 HD operates a 25tonne diaphragm wall grabber for digging diaphragm walls at depths up to 25m.
The 6130 machine is also driven by a powerful 570kW diesel engine which ensures sufficient power reserves. The free-fall speed with the two winches is easily regulated via a potentiometer. The machine's powerful winch strength and high load capacity allow for a fluid and rapid work process, even with heavy grapples.
To be precise, the driver first inserts the grapple into the recess and then allows this to fall repeatedly against the ground with the shovel open. This action loosens the material which can then be dug up from below ground. The smooth sand-gravel wash is then deposited directly beside the machine.
The result is an exact, straight diaphragm wall construction which, with the addition of reinforced concrete, later becomes the foundation for building. The driver requires only a couple of minutes for one cycle - from sinking the grapple to breaking up the sand layers to unloading the material.
Despite the high dynamic requirements, the duty cycle crane remains stable and secure due to its particularly well-balanced machine conception with the 7.2m long track rollers. The caterpillar undercarriage telescopes out hydraulically to a track width of up to 4.1m. In the current configuration, the machine works with a heavy-duty boom running up to 27m long.
