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Several industrial and commercial buildings could reach heights of more than sixty stories. Apparently, while these buildings are being constructed, they require equally tall cranes to transport the supplies to the higher floors. There are cranes which are operated from the back of trucks or other kinds that have their own vehicle connected. Tower cranes are the largest kinds available on the market.
Tower cranes are the stand-alone structures which are often seen on high-rise building projects. Usually, they are part of a major city's downtown skyline. Wherever new construction such as 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 when 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 pounds to 10,000 lbs.
Body
The body of the crane is composed of a vertical steel mast that is composed of individual [parts. The parts are added to increase the overall height of the machine. 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 called. The operator of the crane works from inside of the tower.
Lift
The crane uses a braided metal cord to lift supplies. This cord extends out from a motor situated next to the control module to the end of the boom or jib. There is a pulley system located 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 tower's opposite side. The counter jib holds weights. These weights help to prevent the crane from tipping over when heavy supplies are lifted.
The hydraulic truck crane is a specialized mobile crane which utilizes hydraulic power to raise and transport thousands of pounds. Hydraulics uses forces being transmitted through oil pushing on the boom's pistons in opposite directions in order to lift thousands of pounds. Hydraulic truck cranes are very essential in constructing major projects like for instance airports, bridges, streets and buildings. A crane can complete in minutes tasks which will normally take lots of hours and hundreds of men to complete.
The great machines are normally used in the construction of cities, houses, entire nations and individual buildings throughout the ages. Even the Great Pyramids in Egypt were probably built with the help of basic cranes to enable the heaviest materials in one of the most amazing construction projects of all time.
The very first representation of a crane was featured during the reign of King Ramses in Egypt in 3000 B.C. This was a portrayal of a lifting device which was utilized to collect water. The first official "cranes" appeared during Ancient Greece. These mechanism were utilized to create an entire country during 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 bigger machinery. Hick & Rothwell developed the first cast iron cranes in the year 1834, within Bolton, England. This equipment could lift up to 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.
Ultimately, the wire ropes were weaved together to be able to form an even more powerful strength. This wire formation also brought the added benefit of flexibility. 4 years later, Germany began to make cast iron cranes. The very first cast iron crane made by Germany was made in Neuburg.
