Engineering News-Record
The World's Biggest Supercranes
The World's Biggest Supercranes
Bigge 125D AFRDóBuilt for Shaw Group for two U.S. nuclear sites, the Bigge 125D AFRD, or A-Frame Ring Derrick (which Shaw now calls the Heavy Lift Derrick), is the world's largest supercrane. Costing more than $50 million, it produces a load moment of 125,000 tonne-meters and can lift 6,803 tonnes when fitted with a 91-m-long boom (300 ft). Shaw took it with a standard 171-m-long boom (560 ft), which can lift up to 3,640 tonnes at a radius of 73 m. The distance between the crane's center pole and outer ring is 43 m, making its minimum outreach 31 m (100 ft). Built with a sacrificial concrete foundation and vortex-shedding wind vanes on its center pole, the 125D has a fully functional load chart at winds up to 64 kilometers per hour (40 mph) and can withstand hurricane winds of up to 241 kph (150 mph). It is powered by five diesel engines with a total output of 2,573 kW (3,450 horsepower). A unique feature of this machine is an automatic leveling system that keeps the superstructure plumb at all times, resulting in steadier load handling.
Photo courtesy of Georgia Power Co.

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