Tip-Over
A catastrophic event where a crane loses stability and overturns, often caused by overloading, ground failure, or improper setup.
In Detail
A crane tip-over occurs when the overturning moment (load × radius) exceeds the crane's stabilizing moment (counterweight + machine weight × distance from tipping fulcrum). Common causes include exceeding rated capacity, inadequate ground conditions causing outrigger sinking, operating on slopes without compensation, sudden load swings, wind gusts, improper outrigger deployment, and side-loading the boom. Tip-overs are among the most dangerous crane incidents, frequently resulting in fatalities, massive property damage, and regulatory investigations. Prevention requires strict adherence to load charts, proper ground assessment, LMI monitoring, and comprehensive operator training.
Related Terms
Rated Capacity
The maximum load a crane can safely lift at a given configuration, as specified by the manufacturer's load chart.
Ground Conditions Assessment
Evaluation of the ground surface to ensure it can support the crane's weight and outrigger/crawler loads during operation.
Outrigger
Extendable beams with pads that stabilize mobile cranes by increasing the base of support during lifting operations.
Load Moment Indicator (LMI)
An electronic safety device that monitors crane load, boom angle, and radius to warn operators of overload conditions.