Gigantic dimensions – shallow footprint
The dimensions of bucket wheel excavator Bagger 288 are impressive: 225 meters long, 96 meters high, a bucket wheel made up of 18 buckets and measuring 22 meters in diameter. The wheel is driven by four 840 kW motors. The aggregate drive power of the buckets of 3,360 kW is equivalent to that of more than 30 compact cars. Thick cables deliver 30,000 volts of power to the “Bagger 288”, which features more than 120 kilometers of cabling.
Tipping the scales at 12,840 tons, the “Bagger 288” is a true heavyweight. But the large surface area of its twelve crawlers (eight at the front, four at the rear) mean that when driving over soil, gravel or even grass the excavator leaves tracks no deeper than a human footprint.
This was an important factor when it came to moving the bucket wheel excavator from the Hambach mine to Garzweiler. With a maximum travel speed of ten meters per minute, a minimum turning radius of 100 meters and a maximum gradient capability of one in 18, it took the “Bagger 288” three weeks to cover the 22 kilometer distance.