Different Types of Single Girder and Double Girder Overhead Cranes

April 30, 2020 at 4:00 AM

An overhead crane consists of double overhead runways integrated into a structure’s support system linked by a beam configuration. The beam configuration rests on an end truck structure, which moves on wheels from one end of a runway to the other. All overhead bridge cranes have either a double girder or a single girder design. A bridge girder is the support structure that enables the hoist and trolley to ride along the bridge.

To a degree, the durability and strength of double and single girder cranes are the same. The significant contrast between the two cranes is the length of the hook or the maximum height that the hoist can reach. At T&M Cranes, we understand that the configurations and specifications of overhead cranes can differ significantly. That is why we have created a detailed list of the different types of overhead cranes.

Top Running Cranes

Top running cranes are not limited by space constraints — meaning we can construct these cranes to vast volumes. The cranes consist of rails superimposed on the runways, and the wheels ride on the rails rather than runway beams. Top running cranes are reinforced by support columns and are ideal for transporting massive loads.

Under Running Cranes

Under running cranes are also referred to as underhung, since their wheels are reinforced by the lower flange of beams functioning as the crane’s rails. This type of crane will allow you to increase your establishment’s space for the processing of material since they are buttressed from the roof structure.

We can build these cranes to use an already installed support structure or operate on a recently engineered reinforcing structure. They are usually created for smaller-capacity operations because it can be costly to design a high-capacity under running crane.

Structural I-Beams and Patented Tracks

For under running cranes, we can use either a structural I-beam or a patented track to run the trolley. The patented track is a preferred option because it is more durable and reliable. On the other hand, I-beams are created from softer steel and contain a tilted lower flange that stops the wheels from creating a stable connection with the beam.

Lack of a permanent connection can lead to unbalanced wear and reduce the durability of the runway section. On a patented runway, the bottom part of the beam is made of rolled carbon material for better rigidity. The shaft also has an elevated tread architecture that wears proportionally and cannot peen, unlike typical I-beams. This results in increased stiffness and reliability since the tested quality of the runway is not impacted by wear.

Process Cranes

We build process cranes for very particular needs. These cranes carry heavy loads and take part in perpetual or near-perpetual operations. They’re ordinarily fast-running, double girder machines and have many add-ons built in to operate massive lifts or to handle repetitive tasks. Process cranes are common in facilities such as heavy-duty lifts, steel and lumber plants, machinery processing plants and container yards. We can use process cranes to make 10 to 20 lifts every hour, which is about 50 to 75 percent of their stated capacity.

Modular Cranes

Also commonly known as a kit crane, a modular crane is popular with light manufacturing plants, small mills and machine assemblies. Modular cranes are inexpensive machines for transporting materials within a plant and don’t usually feature many bells and whistles. These Class C cranes can operate at about 40 percent capacity, but we can bump them up to Class D with some design modifications.

Gantry Crane

Gantry cranes and bridge cranes are similar, but gantry cranes use columns to support the hoist, trolley and bridge. These columns move on tracks installed on top of ground or floor structures. Gantry cranes are useful when you want a small and quick crane for operations that demand mobility and resistance to corrosion.

T&M Cranes is a reliable manufacturer and distributor of industrial and commercial equipment, including overhead cranes. Visit our website to find out more about our services and products in Merrillville.