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Some commercial and industrial buildings can reach heights of over sixty stories. Obviously, when these buildings are being constructed, they require equally tall cranes to be able to transport the supplies to the higher floors. There are cranes that have their own vehicle connected or other types which are operated from the rear of trucks. Tower cranes are the largest 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 skyscrapers or apartment buildings and commercial facilities such as shopping center are being built, odds are a crane will be on site.
Types
There are two different kinds of cranes: jib crane of the boom crane. The jib is a metal frame which extends from the main section. On a flat tower crane, the jib remains horizontal when it carries items. On a luffing kind of tower crane, the jib can ratchet to downward or upward angles. The lifting capacity for both kinds can vary from 30 pounds to 10,000 pounds
Body
The crane's body is composed of a mast. This is a vertical steel frame that is a combination of separate parts. So as to increase the overall height of the machine, sections are added. The mast extends upward to where the desired height is, to the control module, that is a small room that has glass windows on all four sides or to the tower as it is also called. The crane operator works from inside of the tower.
Lift
To lift 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 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 tower's opposite side. The counter jib holds weights. These weights help to prevent the crane from tipping over when heavy supplies are lifted.
Hydraulic truck cranes are a specialized type of mobile crane. These cranes utilize hydraulics and could lift thousands of pounds. Hydraulics makes use of 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 important in constructing major projects like bridges, airports, buildings and roads. A crane can accomplish in minutes tasks which will normally take hundreds of men and a lot of hours to complete.
The great equipments are normally utilized in the construction of cities, homes, entire nations and individual buildings throughout the ages. Even the Great Pyramids in Egypt were likely built with the help of basic cranes to allow the heaviest supplies in one of the most awesome construction projects of all time.
The first representation of a crane was featured during the reign of King Ramses within Egypt during 3000 B.C. This was a portrayal of a lifting device which was utilized to collect water. The very first official "cranes" appeared in Ancient Greece. These mechanism were utilized to create a whole country during the 5th century B.C.
These cranes were originally made out of wood. The designs of cranes began to change when dockyards began to need stronger and larger equipments. Hick & Rothwell designed the first cast iron cranes within Bolton, England, in 1834. This machinery was capable of lifting as much as 2 tons. That very same year, the addition of wire rope was added to the crane by an Official of the German Superior Board, Herr Albert Sr. The wire rope made the crane more durable and stronger. This addition allowed cranes to have a bigger capacity for lifting 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 started to make cast iron cranes. The first cast iron crane built by Germany was made in Neuburg.
