Cranes

The crane is a platform or tower that through cables, hydraulics, and pulleys can raise and lower materials. They used in both the construction and large/heavy item manufacturing businesses. In construction, they are usually temporary. Either set on the ground, or mounted on a special purpose vehicle. Many are controlled by an operator in the cab of the crane, though there are applications where they are remotely controlled as well. Remote controls can be either wired, or radio/wireless. The person in control is responsible for the safety of all crew that can come in contact with the cranes load, as well as anything else. Middle Age cranes They used cranes back in the medieval times to build the great cathedrals in the old world. At those times the crane was built on walls at the site, and they were often powered by men running in 2 wheels on each side. They were also used at ports and in shipyards during this period. Mobile cranes The simplest crane has a main truss of steel or a telescopic boom mounted on some sort of moveable platform. It can be on rail, wheels, or on a truck specially built for it. The boom has a hinge at the bottom and the lift is managed by cables or hydraulics. Telescopic crane These cranes have a boom that is made out of a few tubes that fit inside each other. Hydraulics extend and contract it to lengthen or shorten the boom. Tower crane Tower cranes are a modern version of older balance cranes. Fixed to the ground, they give a great combination of height and weight lifting. They are usually used to build tall buildings. Truck mounted crane Some cranes are mounted on trucks with rubber tires to provide better mobility. These truck mounted cranes have outriggers that stretch upright or horizontal to level and support the crane when hoisting. Rough terrain crane These cranes are mounted on top of a carriage that has 4 wheels with rubber tires. They are used for off-road operation. The outriggers on them extend both horizontally and vertically to both level and stabilize these cranes when hoisting. These types of cranes usually have one engine in the undercarriage that powers both movement and crane operation. It also provides them a lower balance point as a result. Loader crane Loader cranes are a hydraulic powered arm usually fit on a trailer to load and unload equipment from the trailer. After use, the sections of the crane can often be folded to fit into a small space, making it easier to transport. Overhead crane Sometimes called a suspended crane as well, these cranes are used mostly in factories. Many lift quite heavy loads, and often mounted next to assembly lines. The hoist moves along one or two beams on a trolley. They move along ground or elevated tracks. In excavation, cranes are often used to move equipment or other materials around the site to areas that aren’t level and hard to move things too. There are many cranes out there ranging from excavation onto roadwork. Cranes can be very useful in building bridges and other construction as well. For years they have been a major asset to construction and excavation. Those that operate them make good money at it, regardless of the type of crane they are operating.

 

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