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Introduction of Single Girder Overhead Crane
A single girder overhead crane is a type of bridge crane that consists of two or more overhead runways built into the building's support structure, with the girder (the bridge) running between the runways for the width of the crane bay.
On a single girder crane, the bridge consists of one girder beam supported on each side by an end truck. The trolley and hoist are most commonly underhung—meaning they run on the bottom flange of the bridge. The bridge itself can either be top running or under running in design.
Single girder cranes offer better hook approach for both the trolley and the bridge travel than a double girder crane can.
One of the most common misconceptions about single girder cranes is that they are not as durable or of the same high quality as double girder cranes. If properly designed, a single girder crane can be the perfect solution for a business that needs a light to medium duty crane, or for a facility where headroom and/or floor space is limited
Single girder bridge cranes are often the most cost-effective lifting solution for various applications and industries. Single girder cranes use less material and are more compact and lightweight than a double girder crane, which results in a significant cost-savings in material, freight, and installation. Also, because they only require one bridge beam, these systems typically have less deadweight, meaning they can utilize lighter runway systems and tie into the existing building support structure.
The major disadvantage of a single girder crane system is that they do have a limit in terms of capacity, span, and hook height.
Advantages of Single Girder Overhead Crane
Less expensive due to a simpler trolley design, reduced freight costs, simplified and faster installation, and less material for the bridge and runway beams
Most economical option for light to medium-duty cranes
Lower loads on the building structure or foundations due to a reduced deadweight. In many cases, it can be supported by existing roof structure without the use of additional support columns.
Better hook approach for both trolley travel and bridge travel
Easier to install, service, and maintain
Ideal for workshops, warehouses, material yards, and manufacturing and production facilities
Lighter load on runway rails or beams means less wear on the beams and end truck wheels over time
Great for facilities with low headroom