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Some commercial and industrial buildings can reach heights of more than sixty stories. Apparently, 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 which have their own vehicle connected or other kinds which are operated from the rear of trucks. Tower cranes are the largest kinds available on the market.
Tower cranes are the stand-alone structures that are often found on high-rise building projects. Usually, they are part of a major city's downtown skyline. Wherever new construction like apartment buildings and skyscrapers and commercial facilities such as shopping center are being built, odds are a crane would 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 as it carries things. On a luffing type of tower crane, the jib can ratchet to downward or upward angles. The lifting capacity for both types can vary from 30 pounds to ten thousand pounds
Body
The body of the crane is composed of a mast. This is a vertical steel frame that is a combination of separate parts. In order to increase the overall height of the machinery, parts are added. The mast extends upward to wherever the desired height is, to the control module, which is a small room which has glass windows on all four sides or to the tower as it is also referred to. The crane operator works from inside of the tower.
Lift
In order to raise supplies, the crane uses a braided metal cord. The cord extends all the way to the end of the boom or jib from a motor situated near the control module. 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 situated 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 carried.
The hydraulic truck crane is a specialized mobile crane that uses hydraulic power to raise and transport thousands of pounds. Hydraulics uses forces being transmitted through oil pushing in opposite directions on the boom's pistons so as to lift thousands of pounds. Hydraulic truck cranes are very important in constructing major projects such as airports, bridges, buildings and roadways. A crane can accomplish in minutes tasks which will normally take hundreds of men and many hours to accomplish.
These remarkable equipments have played a vital role in constructing houses, cities, individual buildings and entire nations throughout the ages. Even Egypt's Great Pyramids were probably built using basic cranes to enable the heaviest supplies in one of the most remarkable construction projects ever.
The very first representation of a crane was showcased 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 build a whole country in the 5th century B.C.
Initially, cranes were first made out of wood. It wasn't until the designers constructing dockyards decided they required something stronger and bigger did these equipments develop. Hick & Rothwell designed the first cast iron cranes in Bolton, England, during the year 1834. This machinery could lift up to 2 tons. That very same year, wire ropes were added to the crane by an Official of the German Superior Board, Herr Albert Sr. The wire rope made the crane stronger and more durable. This addition enabled cranes to have a larger 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 advantage of flexibility. 4 years later, Germany started to build cast iron cranes. The very first cast iron crane built by Germany was made in Neuburg.
