Crane The crane is a lifting device used on construction sites to carry heavy loads; it allows construction work at height. A distinction is made between tower cranes, mobile cranes, crawler cranes and auxiliary cranes. There are also cranes designed for a specific use: forestry cranes, port cranes, etc.
The tower crane is a stationary crane ballasted at its base that can be found, for example, on building construction sites. It can be a self-erecting crane, also known as a self-erecting crane (GMA) or a block-erecting crane (GME). The GMA deploys quickly and automatically by an operator action either from the cab or from the ground using a remote control. For the GME, assembly is done by successively adding elements from the base, with a system of jacks. At a greater height than self-erecting cranes, sectional-erecting cranes must be anchored to a nearby building. A tower crane mainly consists of a mast, a lifting system, a counterweight and a boom to which you can attach a grapple, a cable, a hook ...
Mobile cranes, or crane trucks, are cranes mounted on a carrier. Easy to move, they nevertheless have high lifting capacities. Their boom can be telescopic. Crawler cranes have the advantage of being heavier and therefore more stable than mobile cranes; they can move very large loads. Auxiliary cranes, on the other hand, are small cranes that are attached to a truck or tractor. Their load capacity is much smaller.
Used since ancient times, cranes, traditionally made of wood, became metallic at the end of the 19th century. Different manufacturers (Liebherr, Potain, Grove) then developed a wide range of models.
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