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Several commercial and industrial buildings could reach heights of over 60 stories. Apparently, when these buildings are being constructed, they need equally tall cranes to be able to transport the materials to the higher floors. There are cranes which have their own vehicle attached or other types which are operated from the rear of trucks. Tower cranes are the biggest kinds 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. When new construction like apartment buildings and skyscrapers and commercial facilities such as shopping center are being built, chances are a crane would be on site.
Types
The two key types of cranes can be differentiated by the manner in which their jib or boom lifts materials. The jib is the metal frame which extends from the main section. On a flat tower crane, the jib remains horizontal as it lifts items. On a luffing kind of tower crane, the jib can ratchet to upward or downward angles. The lifting capacity for both types can range from thirty thousand pounds to 10,000 lbs.
Body
The crane's body is composed of a vertical steel mast that is composed of individual [parts. The sections 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 referred to. The crane driver works from inside of the tower.
Lift
The crane utilizes a braided metal cord to be able to raise supplies. This cord extends out from a motor located next to the control module to the end of the jib or boom. 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 has weights. These weights help to prevent the crane from tipping over when lifting heavy materials.
The hydraulic truck crane is a particular mobile crane that utilizes hydraulic power to lift and move thousands of pounds. Hydraulics utilizes forces being transmitted through oil pushing on the boom's pistons in opposite directions so as to lift thousands of pounds. Hydraulic truck cranes are vital in constructing major projects such as airports, bridges, buildings and streets. A crane can complete in minutes tasks that would normally take hundreds of men and lots of hours to complete.
These remarkable machines have played a very important part in building houses, cities, entire nations and individual buildings throughout the ages. Even the Great Pyramids within Egypt were likely built with the help of basic cranes to enable the heaviest supplies in one of the most remarkable construction projects ever.
The very first representation of a crane was featured during King Ramses' reign in Egypt during 3000 B.C. This was a portrayal of a lifting device that was used to collect water. The very first official "cranes" appeared in Ancient Greece. These devices were used to create a whole country during the 5th century B.C.
Originally, cranes were first made out of wood. It wasn't until the designers constructing dockyards decided they required something stronger and larger did these equipments evolve. Hick & Rothwell developed the first cast iron cranes during the year 1834, in Bolton, England. This machinery 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.
The wire ropes were weaved together forming a more powerful rope with even more strength. The newly formed wire also added more flexibility. Germany began to build cast iron cranes 4 years later. The first cast iron crane made by Germany was built within Neuburg.
