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  2. Crane (machine) - Wikipedia

    en.wikipedia.org/wiki/Crane_(machine)

    A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach (also see "self-erecting crane" below) and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards ...

  3. Counterweight - Wikipedia

    en.wikipedia.org/wiki/Counterweight

    Crane The tower crane (see picture) is a modern form of balance crane that is fixed to the ground. A horizontal boom is balanced asymmetrically across the top of the tower. The long arm carries the lifting gear. The short arm is called the machinery arm; this holds the motors and electronics to operate the crane, as well as the concrete ...

  4. Derrick - Wikipedia

    en.wikipedia.org/wiki/Derrick

    A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. Most derricks have at least two components, either a guyed mast or self-supporting tower, and a boom hinged at its base to provide articulation, as in a stiffleg derrick. The most basic type of ...

  5. Jib (crane) - Wikipedia

    en.wikipedia.org/wiki/Jib_(crane)

    A jib or jib arm is the horizontal or near-horizontal beam used in many types of crane to support the load clear of the main support. [1] [2] An archaic spelling is gib. [3] Usually jib arms are attached to a vertical mast or tower or sometimes to an inclined boom.

  6. Repair plan for iconic crane after safety alert - AOL

    www.aol.com/news/repair-plan-iconic-crane-safety...

    The crane's owners say an inspection found no parts were missing but remedial works will begin in the coming weeks to allow the exclusion zone to be lifted. ... the Forth Bridge and Tower Bridge ...

  7. Gin pole - Wikipedia

    en.wikipedia.org/wiki/Gin_pole

    In addition to being used as simple lifting devices in field operations such as construction, logging, loading and unloading boats, and emergency repairs, gin poles are well suited to raising loads above structures too tall to reach with a crane, such as placing an antenna on top of a tower/steeple, and to lift segments of a tower on top of one another during erection.

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