GANTRY CRANES | FEATURE
PELLOBY CRANES
We have said that gantry cranes are more
manufacturers and crane servicers Sissco explain the difference: Bridge or girder or overhead cranes are supported at height, on rails that rest on tall columns or on the walls of the building. Gantry cranes are supported on their own legs, and the legs run along the ground on rails or on rubber tyres. Gantries are therefore self-supporting; the others are part of the structure of the building that houses them. As Sissco point out, of the two designs
gantry cranes are the more flexible. Because they support themselves on the ground they are independent of the building in which they are situated; so can be put into any building, irrespective of the strength, if any, of that building’s walls and without needing pillars or columns to be constructed to carry overhead rails. For the same reason they do not have to be custom-designed. Both of these factors make them economical to install. The footprint over which they can
operate is large and conveniently rectangular; a wall-mounted jib crane, also
commonly found inside manufacturing plants, in contrast has a semicircular operating area, which in real life is far from convenient: how many of us live or work in semi-circular rooms? Also of course gantry cranes have much greater lifting capacity than a wall-mounted jib crane, which generally are designed for lighter loads. However, the overhead or bridge crane can come in double- or even triple-girder forms. Almost all gantry cranes (apart from Goliaths) are single-girder. For indoor applications carrying the very heaviest of loads, therefore, overhead bridge cranes will generally have the advantage. The main consideration between these
two types of crane, overhead versus gantry, therefore comes down to capacity and strength on one side, versus flexibility, and simplicity and economy of installation, on the other. Cranemakers Pelloby, a division
A semi-gantry crane, by Chinese
manufacturers Orbit (Credit: Alex Huang, Wikimedia Commons)
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