Unstable structures can be safely cleaned up with mechanical machines that have a far reach. Cranes with a clam bucket or wrecking ball, excavators, and endloaders are commonly used mechanical demolition machines.

Do not allow workers in any area that can be adversely affected by demolition operations when balling or clamming is being performed. Only permit workers necessary for the performance of the operations in this area at any other time.

The weight of a wrecking ball cannot be greater than 50 percent of the crane's rated load or 25 percent of the nominal breaking strength of the line by which it is suspended, whichever is less. The nominal breaking strength is based on the length of the boom and the maximum angle of operation at which the demolition ball will be used.

Keep the crane boom load line as short as possible. Attach the ball to the load line with a swivel-type connection to prevent twisting of the load line. Attach the ball so that the weight cannot become accidentally disconnected.

Before pulling over walls, make sure all steel members affected have been previously cut free and remove all roof cornices or other ornamental stonework.

During demolition continue inspections by a competent person to detect hazards resulting from weakened or deteriorated floors or walls or loosened material. Do not allow any employee to work where such hazards exist until they are corrected by shoring, bracing, or other effective means.




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