How do big cranes ,used for building skyscrapers, are disassembled after finishing a project?
A tower crane is usually assembled by a telescopic crane of smaller lifting capacity but greater height, and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane will sometimes be lifted to the roof of the completed tower to dismantle the tower crane afterward.
A self-assembling tower crane has been demonstrated, which lifts itself off the ground using jacks, allowing the next section of the tower to be inserted at ground level.
http://en.wikipedia.org/wiki/Crane_%28machine%29#Tower_crane
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