An under running crane, or commonly referred to as an “underhung” crane, uses wheels that are supported by the bottom flange of the runway beam to move the bridge up and down the runway. Under running cranes are most commonly configured in a single girder design for lighter service and lower-capacity applications. They can also be built in a double girder design for higher capacities but it can become impractical and expensive to design and engineer.
An under running single girder crane will utilize an under running hoist and trolley which moves across the bottom flange of the bridge beam. A double girder under running crane can run its hoist and trolley along the top or the bottom of the bridge beams.
These underhung types of cranes can allow you to maximize your facility’s floor space for production and storage of material because they are most commonly supported from the existing ceiling trusses or the roof structure. Underhung cranes also offer excellent side approach and maximize utilization of the building’s width and height when supported by roof or ceiling structures. They’re ideal for facilities that lack vertical clearance to install a top-running overhead crane system.
Under running cranes can be designed in a free-standing configuration if the building’s existing support structure can’t be utilized, but this setup does require the use of support or mounting columns.
Hook height and lift height is less than top running cranes because the bridge and hoist hang underneath the runways.
When it comes to the installation and service of an under running crane system, it can be more of a complex procedure leading to longer downtime. Because the crane is suspended from the runways, it can take longer to check the alignment or service the wheels of the crane, but it is easier to dial in and maintain the alignment and there are fewer tracking problems because it runs on an I-beam which is secured to building structure—limiting movement.
Under running single girder crane technology
Dongqi crane partners with industry-leading suppliers to offer exceptional parts and components when designing and manufacturing Overhead Crane Systems. What that means is we provide our Customers with only the most innovative and technologically advanced components when designing and manufacturing a Crane System.
Contact an expert Overhead Crane Specialist for a free no-obligation assessment of your facility. Let us show you why our over 25 years of Overhead and Bridge Crane Manufacturing experience sets us apart from the competition and how we can increase productivity and safety at your facility!
Under running single girder crane advantages
Typical Load Capacity: 1/4-ton to 15-tons
Typical Span: Under 65 feet
Typical Service: Light to medium duty
Common Applications: Assembly, fabrication shops, maintenance buildings, and manufacturing facilities
Maximizes floor space if supported by existing ceiling trusses or roof structure
Reduces material costs if no runway support columns are needed
Increased end hook approach and bridge beam and hoist are underneath runway beams
Under running single girder crane applications
Equipped with a single bridge beam suspended on either end to two runways, this crane features a hoist that runs on the bottom flange of the bridge beam. Smaller versions (usually enclosed track systems) are often installed to handle capacities of 4,000 pounds or less. Loads from 2 to 15 tons are generally handled by either patented track or structural steel I-beam tracks. Under running cranes are typically mounted from a ceiling or a hanging runway structure. Alternately, they can be mounted on freestanding support structures. These cranes are typically used in CMAA Class C (mid-duty) applications and with spans under 60 feet. With only one girdler, single girder cranes tend to be less expensive than double girder cranes because there’s only one span of steel used to create the bridge beam. Under running cranes, particularly patented track cranes, can interlock with adjoining cranes to allow the trolley to travel from one bridge to the adjacent bridge to increase the equipment’s coverage area.
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