Features
GMA and GME tower cranes

Cranes used in the construction industry fall into three families: GMEs, GMAs and luffing jib cranes, whose installation and use differ according to their characteristics.

• GME (modular cranes)

  Rotation of the rotating part, the boom, is ensured by a slewing ring (or sometimes pivot, figure 1) which is placed at the top of the shaft or mast, fixed (or able to move in one direction).

  The GME crane family (figures 1 and 2) includes cranes with jib and counter-jib:

  • equipped with tie rods (also known as "cable-stayed");

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