A tower crane will perform hundreds of lifts over the course of a construction project, moving heavy materials like steel and concrete into place for construction workers assembling a building. Each lift involves the same basic moves: The rope is lowered down along with the hook so that the load can be attached.

When you look at a tall tower crane, the whole thing seems outrageous -- why don't these structures fall over, especially since they have no support wires of any kind? So these cranes are essentially bolted to the ground to ensure their stability.

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