When is it necessary to set ground chocks on truck and crawler cranes?

Setting ground chocks on truck and crawler cranes is necessary in certain scenarios to ensure stability and safety. The correct answer indicates that ground chocks should be set when a wind alarm is given. Wind can significantly impact the stability of cranes, especially when lifting loads. High winds can lead to tipping or sliding of the crane, which could pose serious safety risks. By using ground chocks when a wind alarm is issued, operators are taking precautions to stabilize the crane against potential wind forces that could otherwise compromise its position and integrity.

In scenarios such as load testing or while the crane is moving, the situation may be adequately managed through other rigging practices or safety protocols that do not require chocks. Additionally, setting chocks only at the end of the workday does not address the immediate safety concerns posed by variable weather conditions, which are particularly critical during lifting operations. Thus, ground chocks serve as a necessary safety measure primarily in response to environmental factors such as wind.