Quote:
Originally Posted by blm3034L!fe
Nice Pic, I always wondered how they make the crane higher? Is there a hydrolic system?
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Yes exactly. If you look at the pic you'll see one section towards the top that's slightly wider than the others. That section contains the hydrolic ram used to lift the top portion, where the jib rests, up while the crane grabs another section from the ground. The new section slides into the blank space just under the ram. Then the process starts over again. At some point the upper portion of the crane is attached to the frame of the building to add extra support, especially in wind.