Double Girder Bridge Crane

A double girder overhead crane is built from two parallel steel girders, with the hoist trolley running on rails mounted on top of them. It suits medium to heavy loads, wide spans and intensive multi-shift work in manufacturing plants, logistics warehouses, steel facilities and maintenance halls. Because the trolley runs on top of the girders rather than hanging beneath them, the hook rises up between the two girders, giving more lifting height than a single girder crane in the same hall. The double girder structure is stiffer, so it can cover wide halls with less bridge deflection under load. Walkways and handrails can be fitted on the girders, giving technicians direct access to the motor, hoist and electrical systems during maintenance. The crane can be fitted with an operator cab, an auxiliary hoist, a lifting magnet or dedicated lifting attachments to suit the application. The model table lists the lifting capacity, span, lifting height and working speeds for each model.

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Other series in this category

EOT Single Girder Bridge Crane

A top-running crane on a single girder, travelling on runway beams supported by the building's columns. The hoist is mounted on a trolley that runs along the bottom flange of the girder, so the total weight of the crane is low, and the load it applies on the runway and the columns is smaller than that of a double-girder crane of the same lifting capacity. This is the configuration that covers most day-to-day work in plants and production halls. Travel of both the hoist and the crane is controlled by a frequency inverter, with controlled acceleration and deceleration that prevent load sway and reduce mechanical wear in the crane and hoist assemblies and in the travel brakes. Span and lifting height are set according to the dimensions of the building or the requirements and needs on site. The structure is designed according to DIN, FEM, and ISO. The duty class is derived from the actual work profile and duty cycles, in addition to the lifting capacity.

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Underslung Crane

An underslung crane hangs from the roof structure or ceiling of the building, and its wheels run on the lower flange of the runway beams. Unlike a top-running overhead crane, it needs no support columns on the floor, so the whole hall stays clear for machines, production lines and forklift traffic. Because the bridge can extend beyond the runways, the hook gets closer to the side walls and covers more of the hall's working area. It suits buildings where the existing roof structure can carry the load, and halls with no room for columns or wall-mounted runways. Available in two configurations: Single girder: one girder with a chain hoist or wire rope hoist travelling along it. Lighter construction, suited to most light and medium-duty work. Double girder: two parallel girders with a hoist trolley running between them. Suited to heavier loads and gives more lifting height, since the hook rises up between the girders. Before design, check that the roof structure can carry the weight of the crane and the load. The model table lists the lifting capacity, span and operating data for each model.

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