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How do construction cranes rise up?

Asked by victord66 (201points) March 19th, 2014

Can anyone provide a video link as to how construction cranes rise up inside a building while it’s being built? I’m not talking about tower cranes, there are lots of videos for them. I mean the ‘climbing’ type of crane that is in the centre of the building as it goes up. I know it’s some type of hydraulic mechanism, but I’d like to see it in action, or have it explained in detail. I’ve searched high and low, but can’t find anything.

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