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There are some industrial and commercial buildings which now exceed sixty stories or more. These buildings all need tall cranes to help transport the materials to the higher floors. There are cranes that have their own vehicle connected or other kinds that are operated from the back of trucks. Tower cranes are the biggest ones offered on the market.
Tower cranes are the stand-alone structures which are normally seen on high-rise building projects. Normally, they are part of a major city's downtown skyline. Wherever new construction like for example skyscrapers or apartment buildings and commercial facilities such as shopping center are being built, odds are a crane will be on site.
Types
The two major types of cranes can be differentiated by the manner in which their boom or jib raises supplies. The jib is the metal frame that extends from the main section. On a flat tower crane, the jib remains horizontal as it lifts things. On a luffing kind of tower crane, the jib can ratchet to downward or upward angles. The lifting capacity for both kinds can vary from 30,000 lbs. to 10,000 lbs.
Body
The body of the crane is composed of a vertical steel mast which is composed of individual [parts. The parts are added to increase the overall height of the equipment. 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 called. The operator of the crane works from inside of the tower.
Lift
To raise supplies, the crane uses a braided metal cord. The cord extends all the way to the end of the jib or boom from a motor located 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 opposite side of the tower. The counter jib holds weights. These weights help to prevent the crane from tipping over when lifting heavy supplies.
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 on the pistons of the boom in opposite directions in order to lift thousands of pounds. Hydraulic truck cranes are really vital in building major projects such as airports, bridges, buildings and roads. A crane can complete in minutes tasks which will normally take lots of hours and hundreds of men to complete.
The vast machinery are usually utilized in the building of cities, houses, whole nations and individual buildings throughout the ages. Even the Great Pyramids in Egypt were likely built using basic cranes to allow the heaviest supplies in one of the most amazing construction projects of all time.
The very first cranes were established during 3000 B.C. Egypt in King Ramses'' reign. This lifting device was originally used to collect water. The first official "cranes" appeared in Ancient Greece. These mechanism were utilized to build an entire country throughout the 5th century B.C.
These cranes were originally made out of wood. The designs of cranes started to change when dockyards began to need stronger and larger machines. Hick & Rothwell designed the very first cast iron cranes in Bolton, England, in the year 1834. This machine was capable of lifting as much as 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 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 build cast iron cranes. The very first cast iron crane built by Germany was made within Neuburg.
