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Some commercial and industrial buildings can reach heights of more than 60 stories. Obviously, when these buildings are being built, they require equally tall cranes to be able to transport the supplies to the upper floors. There are cranes that are operated from the back of trucks or other kinds that have their own vehicle connected. Tower cranes are the largest kinds offered on the market.
Tower cranes are the stand-alone structures which are often found on high-rise building projects. Normally, they are part of a major city's downtown skyline. Wherever new construction like for instance skyscrapers or apartment buildings and commercial facilities like for instance shopping center are being built, chances are a crane will be on site.
Kinds
There are two different kinds of cranes: boom crane or the jib 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 type of tower crane, the jib can ratchet to upward or downward angles. The lifting capacity for both kinds can vary from 30,000 lbs. to 10,000 lbs.
Body
The crane's body is composed of a mast. This is a vertical steel frame that is a combination of individual sections. In order to increase the overall height of the equipment, sections are added. The mast extends upward to wherever 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 referred to. The driver of the crane works from inside of the tower.
Lift
The crane uses a braided metal cord to raise materials. This cord extends out from a motor located near the control module to the end of the jib or boom. 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 toppling over when heavy materials are lifted.
The hydraulic truck crane is a particular mobile crane which uses hydraulic power to lift and transport thousands of pounds. Hydraulics utilizes 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 important in constructing major projects like for instance bridges, airports, streets and buildings. A crane could complete in minutes tasks that will normally take a lot of hours and hundreds of men to complete.
The vast machines are commonly utilized in the building of cities, homes, whole nations and individual buildings throughout the ages. Even the Great Pyramids within Egypt were probably constructed using basic cranes to allow the heaviest supplies in one of the most amazing construction projects ever.
The very first cranes were established during 3000 B.C. Egypt in King Ramses'' reign. This lifting mechanism was originally utilized to collect water. The very first official "cranes" appeared during Ancient Greece. These mechanism were used to build an entire nation during the 5th century B.C.
Originally, cranes were first made out of wood. It wasn't until the designers building dockyards decided they needed something stronger and larger did these equipments develop. Hick & Rothwell designed the first cast iron cranes within Bolton, England, during the year 1834. This equipment was capable of lifting 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 larger 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 advantage of flexibility. 4 years later, Germany started to make cast iron cranes. The first cast iron crane built by Germany was built in Neuburg.
