Hoisting with a crane on outriggers, what is the most dangerous area?

Hoisting with a crane on outriggers, what is the most dangerous area?

• A. Center
• B. Corner
• C. Under Hoist
• D. Outriggers

Answer: (B)

When a crane is set on outriggers, its stability comes from the four-point base formed by those outriggers. The most dangerous area to be in or near during hoisting is toward a corner because moving the load toward a corner shifts the crane’s center of gravity toward that diagonal. That reduces the stability margin and makes tipping more likely, especially if ground conditions under that corner are soft or uneven and one outrigger starts to settle. In that corner zone, a tipping moment can develop quickly and the crane can move or soak into the ground with little warning, posing a direct risk to anyone standing nearby. The center is better balanced, the area under the hoist is risky due to the suspended load itself, and near the outriggers is dangerous mainly from moving parts, but the corner represents the tipping vulnerability and the greatest potential for a sudden, uncontrollable move.

When a crane is set on outriggers, its stability comes from the four-point base formed by those outriggers. The most dangerous area to be in or near during hoisting is toward a corner because moving the load toward a corner shifts the crane’s center of gravity toward that diagonal. That reduces the stability margin and makes tipping more likely, especially if ground conditions under that corner are soft or uneven and one outrigger starts to settle. In that corner zone, a tipping moment can develop quickly and the crane can move or soak into the ground with little warning, posing a direct risk to anyone standing nearby. The center is better balanced, the area under the hoist is risky due to the suspended load itself, and near the outriggers is dangerous mainly from moving parts, but the corner represents the tipping vulnerability and the greatest potential for a sudden, uncontrollable move.