There are two main types of tower crane in general use

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There are two main types of tower crane in general use

Tower cranes--Date:2010-8-28 9:27:07 --Tower crane

There are two main types of tower crane in general use;
��1. Self Erect Tower Crane
��This is a tower crane that is designed to be easily and rapidly transported and erected. Some of them carry their own generator and are therefore completely self contained.
��2. Assisted Erect Tower Crane
��This type of tower crane is usually larger with a greater lifting capacity than the Self Erect. Its design calls for it to be builton site, piece by piece, often with the assistance of a mobile crane, hence its name ��Assisted Erect��.
��Both yypes of tower crane can be found in operation with a variety of jib configurations, all designed to provide a specific type of lifting service to sites where the lifting requirements and the environment produce different demands.
��The two types of basic jib design are:
��1. Horizontal Jib
��This jib takes the form of a simple structure extending from the tower, along which a trolley can travel, carrying the hoist rope and hook assembly to vary radii.
��2. Luffing Jib
��The luffing jib has no trolley, the variation of hook radii is achieved by altering the jib angle, the same as with a mobile crane.
��More detailed information on these crane and jib types can be found by reading the following pages.
��
��Horizontal Jib Tower Crane Self Erect
��This configuration of crane is not found as frequently in this country as on the continent, where it is common use as a small builders crane, employed in lifting activities more usually carried out by telescopic forklifts in the UK .
��The true self erect tower crane is smaller and of lower capacity than its assisted erect counterpart, but has the great advantage of being quick and easy to erect. The erection procedure is well within the capability of a trained fitter or competent driver and the newly erected crane does not have to undergo the sort of comprehensive commissioning procedures required by an assisted erect crane.
��In recent years there has been a move toward tower cranes that are quick to erect, but the small size and capacity of the self erect crane has always proved a barrier to its usefulness on most construction sites. Tower crane manufacturers are now producing a design of crane which embodies the best features of both the self erect and assisted erect tower cranes. Called the ��City Crane��, these machines can be erected quickly and have a size and capacity which makes them an attractive proposition for use on general construction sites.
��Some self erect tower cranes are mounted on a crawler track base and with the provision of an on-board generator and independent of an external power supply. These cranes have the abilty to be extremely mobile around a site, travelling fully erected without a load. Whatever their base type, self erect cranes usually require the use of outriggers which are used to both support and level the crane during lifting operations. Because of their importance to crane stability, outriggers should be checked by the driver frequently for security and level.

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