Cranework

Crane Types

Single girder cranes Overhead.  – The crane consists of a single bridge girder supported on two end trucks. It has a trolley hoist mechanism that runs on the bottom flange of the bridge girder.

Gantry Crane : The bridge (which carries the hoist and trolley) is supported by a pair of rigid steel legs which, in turn, are carried by a pair of end trucks along the floor-level runway. The gantry crane provides the same performance characteristics that an overhead bridge crane offer

Monorail – For some applications such as production assembly line or service line, only a trolley hoist is required. The hoisting mechanism is similar to a single girder crane with a difference that the crane doesn’t have a movable bridge and the hoisting trolley runs on a fixed girder. Monorail beams are usually I-beams (tapered beam flanges).

Jib Crane: This type of crane consists of a pivoting head and boom assembly, which carries a hoist and trolley unit. The pivoting head is supported either by a floor-mounted mast providing 360°-boom rotation or by an existing building column, which provides 180° of boom rotation. The jib crane can also be motorized to provide precise spotting of loads, however, the hook location is along a radial path rather than a simple X-Y arrangement.

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