Potain Tower Cranes San Jose

Some commercial and industrial buildings are capable of reaching heights of more than 60 stories. Obviously, while these buildings are being built, they need equally tall cranes to be able to transport the materials to the higher floors. There are cranes which are operated from the rear of trucks or other kinds that have their own vehicle connected. Tower cranes are the largest kinds available on the market.



Tower cranes are stand-alone structures seen as part of a major city's downtown skyline on high-rise building projects. Wherever new construction like skyscrapers or apartment buildings and commercial facilities such as shopping center are being constructed, chances are a crane will be on site.



Kinds

There are two different kinds of cranes: boom crane or the jib crane. The jib is a metal frame which extends from the main section. On a flat tower crane, the jib remains horizontal as it lifts items. On a luffing kind of tower crane, the jib can ratchet to upward or downward angles. The lifting capacity for both types could vary from 30,000 lbs. to 10,000 lbs.



Body

The body of the crane is composed of a mast. This is a vertical steel frame that is a combination of separate sections. In order to increase the overall height of the equipment, sections are added. The mast extends upward to wherever 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 called. The operator of the crane works from inside of the tower.



Lift

The crane uses a braided metal cord to be able to raise materials. This cord extends out from a motor located near the control module to the end of the jib or boom. 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 situated on the tower's opposite side. The counter jib has weights. These weights help to prevent the crane from tipping over when heavy materials are lifted.

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