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A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach (also see "self-erecting crane" below) and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards ...
Developments in tower crane design and the increasing complexity of construction sites in the 1970’s and 1980’s led to an increase in the quantity and proximity of tower cranes on construction sites. This increased the risk of collisions between cranes, particularly when their operating areas overlapped.
Crane The tower crane (see picture) is a modern form of balance crane that is fixed to the ground. A horizontal boom is balanced asymmetrically across the top of the tower. The long arm carries the lifting gear. The short arm is called the machinery arm; this holds the motors and electronics to operate the crane, as well as the concrete ...
Stothert & Pitt crane with Toplis gear. An early form of level-luffing gear was the "Toplis" design, invented by a Stothert & Pitt engineer in 1914. [2] [3] The crane jibs luffs as for a conventional crane, with the end of the jib rising and falling. The crane's hook is kept level by automatically paying out enough extra cable to compensate for ...
The base of the tower is hinged and the top of the tower is connected to a pulley system for load lifting. As this is a simple derrick system, it is recommended for use by some agencies as an improvised rescue derrick in an emergency situation where no suitable rescue derrick or crane is available. [1] [2]
Manitowoc Crane Care is the customer service branch of Manitowoc Cranes. Formed in 2000, [8] Crane Care provides customers with parts, service and technical support, technical publications, training, and EnCORE. The EnCORE program rebuilds and repairs run-down or damaged cranes. Manitowoc Crane Care operates in 15 countries at 22 locations.
A jib or jib arm is the horizontal or near-horizontal beam used in many types of crane to support the load clear of the main support. [1] [2] An archaic spelling is gib. [3] Usually jib arms are attached to a vertical mast or tower or sometimes to an inclined boom.
A 13th century drawing of a treadwheel crane. A treadwheel crane (Latin: magna rota) is a wooden, human powered hoisting and lowering device. It was primarily used during the Roman period and the Middle Ages in the building of castles and cathedrals. The often heavy charge is lifted as the individual inside the treadwheel crane walks.