How do they get cranes to the top of new buildings?

New buildings start – cranes is on bottom floor – two weeks later 5 floors are finished and crane is still on top – HOW DO THEY DO THAT ?

3 Responses to “How do they get cranes to the top of new buildings?”

  1. turbo_18t_2002  on September 15th, 2013

    THEY BUILD THE CRANE UP AS THE BUILDING GOES UP. THE CRANE IS LIKE A LEGO SET. IT HAS PIECES THAT THEY ATTACH TO KEEP GOING UP. USUALLY THEY HAVE 2 CRANES. THEY CAN BUILD EACHOTHER.

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  2. dismuhghettoname  on September 15th, 2013

    Huge steel cranes usually top skyscrapers, and are used to lift
    construction materials to the top.

    These “climbing tower cranes” get to the tops of the buildings by
    climbing up a steel tower. The steel tower, also called a mast, is
    built in-place by the crane that climbs it.

    At the ground a concrete base is poured and the first section of the
    tower is bolted deeply into it. The crane cab, arm, and
    counterweight are installed, along with hydraulic rams that can lift
    it a little bit at a time. A new tower section is lowered into place
    by the crane, and then the crane uses the hydraulic rams to move up
    onto the new tower section. As the building grows, so does the crane
    tower. When the building is finished, the crane climbs back down,
    taking the tower apart as it descends.

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  3. campbelp2002  on September 15th, 2013

    The crane is first assembled using a portable crane. Then sections are added to it using a device called a top climber. Basically they detach the top while keeping it balanced on the tower, jack it up 20 feet, insert a new section of tower using the detached but still balanced crane itself (yikes!), and re-attach the crane to the new top.

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