These concrete pads weigh about 2 tons.Įach crane has a load chart that, in short, specifies the crane’s capabilities detailing its features and how its lift capacity varies when considering distance and angle.

These concrete slabs are made ready several weeks before the arrival of the tower cranes. These towers are held at the base by concrete structures/pads, with the help of anchor bolts.

Load moment limit switch: This limit switch along with its accessories ensures the load-moment (tonne-meter) rating does not exceed beyond the given limit, after which the hoist motor and traversing motors are tripped with audible and visual alarms.Maximum load limit switch: This switch along with its accessories monitors the pull (strain) on the cable and thus does not allow the maximum load limit to cross 18 tons, after which it trips the motor and gives audible and visual alarms.Tower crane load capacityīasic precautions for a Tower Crane with respect to a load being lifted: So moment about the crane’s center is 10 tons * 30 meters = 300 tonne-meter. So moment = load * distance.Ī 300 tonne-meter limit can be inferred as a load of 10 tons being lifted at a distance of 30 meters from the center of the crane. It is the moment of the load lifted about the crane’s center. The factor 300 tonne-meter is instrumental in understanding the load limitation. So it is always better to lift loads keeping them as close as possible to the crane’s center. However the quantity of weight to be lifted keeps on decreasing as the distance from crane center increases. The maximum weight that the tower crane can lift is 18 Metric Tons. It may be some steel wires fixed from the crane mast to the different parts of the building. If the crane height is more than 265 feet, then some means of sturdy support is required. Counterweights – 20 tons (16.3 Metric Tons). Each and every component of the tower crane affects the load lifting capacity of the tower crane.įor a typical tower crane Maximum unsupported height – 80 meters (265 feet) Maximum Reach – 70 meters (230 feet), Maximum Lifting Power – 19.8 tons (18 Metric Tons), 300 tonne-meters. The limitation for lifting weight starts from the base of the tower crane. The lifting capacity of Tower crane depends on various factors. 5 How to calculate crane load capacity?.

50 ton crane load chart