Where must central ballast blocks be distributed around the tower base?

Central ballast blocks must be distributed equally around the tower base to ensure proper stability and balance of the crane. When ballast is evenly distributed, it helps to lower the center of gravity and enhances the overall stability of the tower crane, particularly during lifting and hoisting operations. Uneven distribution of ballast can lead to tipping or swaying, which poses significant safety risks not only to the crane operator but also to the crew and equipment in the surrounding area.

In practice, placing ballast blocks in an equal manner around the base is crucial for maintaining the structural integrity and operational efficiency of the crane. It allows for better load distribution when the crane is lifting heavy materials, thereby preventing potential accidents or malfunctions. By focusing on equilibrium, operators can assure the safety of their operations.