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Some industrial and commercial buildings could reach heights of over sixty stories. Obviously, when these buildings are being constructed, they need equally tall cranes to be able to transport the supplies to the higher floors. There are cranes that are operated from the back of trucks or other types which have their own vehicle connected. Tower cranes are the largest kinds offered on the market.
Tower cranes are the stand-alone structures that are usually found on high-rise building projects. Normally, they are part of a major city's downtown skyline. Wherever new construction like for instance apartment buildings and skyscrapers and commercial facilities like for instance shopping center are being constructed, odds are a crane would be on site.
Kinds
There are two different kinds 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 when it lifts items. On a luffing type of tower crane, the jib could ratchet to downward or upward angles. The lifting capacity for both kinds could 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 separate [parts. The parts are added to be able increase the overall height of the equipment. The mast extends upward to wherever 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 driver of the crane 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 jib or boom from a motor located next to the control module. There is a pulley system situated at the end of the jib, through which the cord is positioned and lowered down. The jib which holds the cord becomes balanced by a counter jib located on the opposite side of the tower. The counter jib holds weights. These weights help to prevent the crane from toppling over when lifting heavy supplies.
The hydraulic truck crane is a particular mobile crane which uses hydraulic power to raise and transport thousands of pounds. Hydraulics utilizes forces being transmitted through oil pushing in opposite directions on the boom's pistons in order to lift thousands of pounds. Hydraulic truck cranes are really vital in building major projects like airports, bridges, buildings and streets. A crane can accomplish in minutes jobs that would normally take hundreds of men and many hours to accomplish.
These impressive machines have played a vital role in constructing houses, cities, entire nations and individual buildings throughout the ages. Even the Great Pyramids within Egypt were likely constructed with the help of basic cranes to allow the heaviest materials in one of the most amazing construction projects ever.
The very first representation of a crane was featured 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 during Ancient Greece. These mechanism were used to build an entire nation in the 5th century B.C.
These cranes were originally made out of wood. The designs of cranes started to change when dockyards began to need stronger and bigger machinery. Hick & Rothwell designed the very first cast iron cranes in the year 1834, in Bolton, England. This equipment was capable of lifting as much as 2 tons. That 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 to lift heavy weights.
Eventually, 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. 4 years later, Germany began to build cast iron cranes. The first cast iron crane built by Germany was made in Neuburg.
