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There are some commercial and industrial buildings that now surpass 60 stories or more. These buildings all need tall cranes to help move the supplies to the upper floors. There are cranes which have their own vehicle connected or other kinds that are operated from the rear of trucks. Tower cranes are the largest kinds available on the market.
Tower cranes are stand-alone structures found as part of a major city's downtown skyline on high-rise building projects. When new construction like for instance apartment buildings and skyscrapers and commercial facilities like 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 that extends from the main section. On a flat tower crane, the jib remains horizontal as it lifts things. On a luffing type of tower crane, the jib can ratchet to downward or upward angles. The lifting capacity for both types could vary from 30 pounds to 10,000 pounds
Body
The body of the crane is composed of a vertical steel mast which is composed of separate [parts. The sections are added to be able increase the overall height of the machine. The mast extends upward to where the desired height is, to the control module, which is a small room that has glass windows on all four sides or to the tower as it is also referred to. The operator of the crane 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 situated 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 opposite side of the tower. The counter jib has weights. These weights help to prevent the crane from toppling over when raising heavy materials.
The hydraulic truck crane is a specialized mobile crane that uses hydraulic power to raise and move thousands of pounds. Hydraulics utilizes 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 really essential in constructing major projects such as bridges, airports, buildings and streets. A crane can accomplish in minutes jobs that would normally take hundreds of men and many hours to complete.
These remarkable equipments have played a very important part in building houses, cities, individual buildings and entire nations throughout the ages. Even the Great Pyramids within Egypt were likely built utilizing basic cranes to allow the heaviest supplies in one of the most awesome construction projects of all time.
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 mechanism which was utilized to collect water. The first official "cranes" appeared during Ancient Greece. These devices were utilized to build an entire nation throughout the 5th century B.C.
These cranes were originally made out of wood. The designs of cranes began to change when dockyards started to need stronger and bigger machines. Hick & Rothwell developed the very first cast iron cranes during eighteen thirty four, in Bolton, England. This machinery was capable of lifting up to 2 tons. That 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.
The wire ropes were weaved together forming a more powerful rope with even more strength. The newly formed wire also added more flexibility. 4 years later, Germany started to build cast iron cranes. The first cast iron crane built by Germany was made within Neuburg.
