Advantages and Disadvantages of Single Overhead Bridge Cranes

Posted on June 5, 2018 in Gantry Cranes

Advantages and Disadvantages of Single Overhead Bridge Cranes

Overhead cranes that operate with a minimum of two overhead runways built into a building’s support structure are more commonly referred to as “bridge” cranes. The bridge serves two purposes – first, it’s a load-bearing beam running the entire width of the work area and second, it’s the structure connecting the runways on which the hoist moves. The configuration is based on the number of beams it’s comprised of. For example, one beam is known as a single girder configuration while two would be a double girder configuration.

Design Selection Factors

One of the primary factors that influence the complexity and cost of an overhead lifting system is its design. So it’s important to select a configuration that best addresses your specific application. The bridge on a single girder crane is comprised of one beam that is supported by two end trucks (one on each side). While the bridge can have a top or under-running configuration, the hoist and trolley are normally underhung. If a light or medium duty crane best addresses your application and you have limited headroom to work with, a single girder crane is the ideal choice. Thus, selecting the gantry based on your specific requirement is important.

Furthermore, they’re more cost-effective than the double girder counterpart because they require fewer manufacturing materials and are typically lighter. However, there is a downside with those cost savings, namely they are limited where capacity, hook height, and span are concerned. Additionally, certain special features such as operator cabs and walkways are more difficult to incorporate into a single girder crane design and are more costly as a result. For applications requiring a 15-ton+ capacity, a span of 65+ feet, or other special features, the double girder crane is a better choice.

Advantages and Disadvantages

Whenever you are considering a single girder overhead crane for your facility, you’ll want to take the following advantages and disadvantages into consideration.

• Easier installation, maintenance, and service
• Ideal for buildings with limited headroom
• Lower overall weight
• Lower production costs
• One of the more cost-effective options for light and medium duty applications

• Decreased hook height compared to double girder overhead lifting systems
• Lower rated lifting capacity (less than 15 tons)
• Operator cabs, walkways, and other special features are difficult to incorporate
• Trolley wheels are mounted on the bottom flange of the girder thereby causing more wear to it

Just like other pieces of equipment, it is important to research all of your options. With the size of investment that’s required, you have to make a well-informed decision.

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