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Several industrial and commercial buildings could reach heights of over sixty stories. Apparently, when these buildings are being built, they require equally tall cranes to move the supplies to the higher floors. There are cranes which have their own vehicle attached or other types that are operated from the back of trucks. Tower cranes are the biggest ones offered on the market.
Tower cranes are stand-alone structures seen as part of a major city's downtown skyline on high-rise building projects. Wherever new construction like for instance apartment buildings and skyscrapers and commercial facilities like shopping center are being built, chances are a crane will be on site.
Kinds
There are two different types of cranes: boom crane or the jib crane. The jib is a metal frame that extends from the main section. On a flat tower crane, the jib remains horizontal as it lifts items. On a luffing type of tower crane, the jib could ratchet to upward or downward angles. The lifting capacity for both types can vary from 30,000 lbs. to 10,000 pounds
Body
The body of the crane is composed of a vertical steel mast which is composed of individual [parts. The parts are added to be able increase the overall height of the machinery. The mast extends upward to where the desired height is, to the control module, that is a small room which has glass windows on all four sides or to the tower as it is also referred to. The crane driver works from inside of the tower.
Lift
In order to raise materials, the crane utilizes a braided metal cord. The cord extends all the way to the end of the boom or jib from a motor situated next to the control module. There is a pulley system located at the end of the jib, through which the cord is positioned and lowered down. The jib that holds the cord becomes balanced by a counter jib located on the tower's opposite side. The counter jib has weights. These weights help to prevent the crane from tipping over when heavy materials are carried.
Hydraulic truck cranes are a specific type of mobile crane. These cranes make use of hydraulics and could lift thousands of pounds. Hydraulics uses forces being transmitted through oil pushing in opposite directions on the pistons of the boom in order to lift thousands of pounds. Hydraulic truck cranes are really essential in constructing major projects like for example bridges, airports, roadways and buildings. A crane could accomplish in minutes jobs that would normally take hundreds of men and lots of hours to complete.
The vast machinery are commonly utilized in the building of cities, homes, entire nations and individual buildings throughout the ages. Even Egypt's Great Pyramids were probably constructed using basic cranes to enable the heaviest materials in one of the most awesome construction projects of all time.
The first representation of a crane was showcased during the reign of King Ramses in Egypt during 3000 B.C. This was a portrayal of a lifting device which was used to collect water. The first official "cranes" appeared in Ancient Greece. These mechanism were used to create a whole nation throughout the 5th century B.C.
These cranes were originally made out of wood. The designs of cranes started to change when dockyards began to require stronger and larger machinery. Hick & Rothwell designed the first cast iron cranes within Bolton, England, in the year 1834. This equipment could lift as much as 2 tons. That very same year, the addition of wire rope was added to the crane by Herr Albert Sr. who was an Official of the German Superior Board. The wire rope made the crane more durable and stronger. This addition enabled cranes to have a bigger capacity for lifting heavy weights.
Ultimately, the wire ropes were weaved together in order to form an even more powerful strength. This wire formation also brought the added benefit of flexibility. Germany began to build cast iron cranes 4 years later. The very first cast iron crane built by Germany was built within Neuburg.
