Raising Crane

In the external climbing method, the base of the crane is fixed in a concrete slab in the ground, and the crane tower is erected beside the building using smaller, mobile cranes. Once the building is about 180 feet tall (some 15 stories), the crane is fastened to the building with steel collars, and new segments are inserted into the crane?s backbone. To add segments to itself, the crane has a special climbing section?a big metal sheath that scales the outside of the crane tower. This sheath raises the arm above the last vertebra and temporarily supports it, then takes in a new tower segment from the arm. The sheath holds that segment in place while workers bolt it in. They repeat this process every 180 feet or so: The crane constructs the building, then it?s fastened to the building, then it receives new vertebrae to grow taller.

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