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There are several industrial and commercial buildings which now surpass 60 stories or more. These buildings all need tall cranes to help move the supplies to the upper floors. There are cranes that have their own vehicle attached or other kinds that are operated from the back of trucks. Tower cranes are the biggest ones on the market.
Tower cranes are the stand-alone structures which are normally seen on high-rise building projects. Usually, they are part of a major city's downtown skyline. When new construction like for example skyscrapers or apartment buildings and commercial facilities like for example shopping center are being constructed, odds are a crane would be on site.
Types
The two major types of cranes could be differentiated by the manner in which their boom or jib raises supplies. The jib is the metal frame which extends from the main section. On a flat tower crane, the jib remains horizontal as it carries items. On a luffing kind of tower crane, the jib could ratchet to downward or upward angles. The lifting capacity for both types could range from 30,000 lbs. to ten thousand pounds
Body
The crane's body is composed of a mast. This is a vertical steel frame that is a combination of separate sections. So as to increase the overall height of the machine, parts 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 crane operator works from inside of the tower.
Lift
The crane utilizes a braided metal cord to be able to lift materials. This cord extends out from a motor located near the control module to the end of the boom or jib. There is a pulley system located 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 toppling over when heavy supplies are lifted.
The hydraulic truck crane is a specialized mobile crane that utilizes hydraulic power to lift and move thousands of pounds. Hydraulics makes use of forces being transmitted through oil pushing in opposite directions on the pistons of the boom so as to lift thousands of pounds. Hydraulic truck cranes are important in building major projects like bridges, airports, roads and buildings. A crane could accomplish in minutes tasks that will normally take many hours and hundreds of men to complete.
These impressive machines have played a vital role in building houses, cities, individual buildings and entire nations throughout the ages. Even the Great Pyramids within Egypt were likely constructed with the help of basic cranes to enable the heaviest supplies in one of the most amazing construction projects ever.
The first cranes were established during 3000 B.C. Egypt during King Ramses'' reign. This lifting mechanism was initially used to collect water. The first official "cranes" appeared during Ancient Greece. These devices were used to create a whole country in the 5th century B.C.
These cranes were initially made out of wood. The designs of cranes began to change when dockyards started to need stronger and larger machines. Hick & Rothwell developed the very first cast iron cranes in Bolton, England, in eighteen thirty four. This machine 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 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 benefit of flexibility. 4 years later, Germany started to make cast iron cranes. The first cast iron crane built by Germany was made within Neuburg.
