Selecting the right type of crane for your business is critical to maximizing efficiency, streamlining workflow, and getting the best bang for your buck. Overhead cranes can vary so much in terms of specifications and configurations. No two crane builds are exactly alike! A crane that worked in a similar building structure, or similar lifting application, may not be the best crane for your facility or your application.
So, selecting the right type of crane for your business is critical to maximizing efficiency, streamlining workflow, and getting the best bang for your buck. An overhead bridge crane can be configured in a single girder or double girder design. In simple terms, a bridge girder, or beam, is the support structure that allows the trolley and hoist to move from side-to-side along the bridge.
The trolley is used to precisely position the hoist prior to raising or lowering a load. To a degree, both single and double girder cranes are equal in strength and durability. The main difference between the two comes down to hook height, or how high above the ground your hoist can lift.
A double girder crane can provide more hook height because the hoist is placed on top of the girders, instead of below them. There are some instances where a double girder or single girder configuration may be the better option. Single Girder — 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. They also tend to be less expensive due to:.
However, in the instance that a crane needs to handle more than 15 tons, or the span is more than 65 feet, a double girder configuration may be the better option. Double Girder — There are two girder beams that make up the bridge, and they are supported by an end truck on each side. The trolley and hoist run on a rail installed on top of the bridge girders.
Double girder cranes are recommended for heavier-duty applications where the crane has to handle more than 15 tons, or the span is more than 65 feet.
Double girder cranes are the best option when the crane needs to be customized with things like walkways, cabs, magnet cable reels, or other specialized equipment. When it comes to defining clear differences between bridge cranes, you will want to consider if you require a top running or under running crane. On an under running, or underhung crane, the bridges are supported by the bottom of the runway beams and the wheels run along the bottom of the lower beam flange.
Top running cranes — These cranes have no limiting capacity—meaning they can be built to go from small capacities to very large capacities.
They include a rail installed on top of each runway, and the bridge wheels move on the rail instead of the bottom flange of the runway beam. These cranes are supported by the building structure or runway support columns, or sister columns, and are ideal for moving extremely heavy loads. Or, they can be designed to utilize an existing support structure if adequate , or run on a newly-engineered support structure.
This post is dedicated to Bridge Cranes and Gantry Cranes. If you are looking for a Jib Crane , or Monorail Crane information, please select one of those links to find out more.
If you are a production facility a Bridge Crane will likely be the solution you are looking for. They typically cost more but allow for higher capacities, faster cycle times, less obstruction to the work area, and you can move and position a load any way you require with a 3-axis movement capability. Bridge cranes have many different configurations and are custom sized to the needs of the environment.
Gorbel Free Standing Crane. Learn More About Freestanding Cranes. Freestanding Crane Pricing. Monorail Crane at Shipping Dock. Learn More About Monorail Cranes. Monorail Crane Pricing. What bridge capacity is required? How often is the crane to be used? Required span? How long is the runway travel? How high must the hoist lift? Is the bridge going to be supported by the building, self-supported, or both? Is the application indoors or outdoors? How is the crane powered?
All motorized, push-pull, hand geared, or combination? If motorized, how fast? Single or dual speeds? Variable frequency drives? Preferred voltages? What type of control? Pendant from hoist, separate track or remote control?
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