Looming above downtown Columbia, tower cranes lift difficult-to-manage building materials and put them in place for construction projects. The tower crane is used to develop buildings where city quarters are tight and other buildings are in close proximity.

Have you ever glanced up and wondered: How does this contraption work? A mobile crane builds the tower crane by assembling the mast (the vertical portion of the crane) and slewing unit (which allows the crane to spin around). Unlike tower cranes that have to be built on scene, mobile cranes are attached to truck-type carriers and can be raised or lowered. Then the jib, machinery arm and counterweights are added. To get to its maximum height, the crane extends itself upward one section at a time. Learn more about the six essential parts that make up tower cranes.

Hover over the image below to view the anatomy of the tower crane's around Columbia. 

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