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There are some commercial and industrial buildings that now exceed 60 stories or more. These buildings all need tall cranes to help transport the supplies 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 stand-alone structures found as part of a major city's downtown skyline on high-rise building projects. Wherever new construction like for instance skyscrapers or apartment buildings and commercial facilities like for example shopping center are being built, chances are a crane would be on site.
Kinds
There are two different types 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 when it carries items. On a luffing type of tower crane, the jib could ratchet to upward or downward angles. The lifting capacity for both types could vary from 30,000 lbs. 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 be able increase the overall height of the machinery. The mast extends upward to where 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 called. The crane driver works from inside of the tower.
Lift
The crane uses a braided metal cord to lift supplies. This cord extends out from a motor situated 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 that 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 tipping over when raising heavy supplies.
Hydraulic truck cranes are a specialized kind of mobile crane. These cranes utilize hydraulics and can lift thousands of pounds. Hydraulics uses 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 like for example bridges, airports, streets and buildings. A crane could complete in minutes jobs which would normally take hundreds of men and lots of hours to complete.
These remarkable machinery have played a very important role in building houses, cities, individual buildings and entire nations throughout the ages. Even the Great Pyramids within Egypt were probably constructed using basic cranes to allow the heaviest materials in one of the most remarkable construction projects of all time.
The first cranes were established in 3000 B.C. Egypt in the reign of King Ramses. This lifting mechanism was first used to collect water. The very first official "cranes" appeared in Ancient Greece. These devices 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 building dockyards decided they required something stronger and bigger did these machinery evolve. Hick & Rothwell developed the very first cast iron cranes during the year 1834, in Bolton, England. This machinery can lift up to 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 larger capacity to lift 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 first cast iron crane made by Germany was made within Neuburg.
