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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 level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base. [1] Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
In 2007, Tishman Construction Corporation of New York completed a row of steel columns at the perimeter of the construction site. Two tower crane bases were erected, each base containing a functioning luffing-jib tower crane. By the end of 2007, the tower's footings and foundations were nearly complete. [10]
The "hammerhead", or giant cantilever, crane is a fixed-jib crane consisting of a steel-braced tower on which revolves a large, horizontal, double cantilever; the forward part of this cantilever or jib carries the lifting trolley, the jib is extended backwards in order to form a support for the machinery and counterbalancing weight. In addition ...
Electric cranes, supplied by electricity from a single centralised generating station or prime mover, could offer a lot of power per crane, without requiring the high cost of an equivalent steam plant on each crane. Port cranes were almost all luffing jib cranes, often with a long reach. Their lifting capacity depended on how far they were ...
In August 1878 the crane had been completed and tested, at a cost of £3,600 for the machinery, plus the masonry foundations. The jib has a radius (reach) of 35 feet (11 m) and a height of 40 feet (12 m). The crane weighs 120 tons.
The crane was powered by a semi-portable steam engine in a small cabin at the rear of the jib, also helping as a counterweight. 1871 timber queen post truss jib, for the North Sea Canal. Construction of the Dutch Noordzeekanaal from 1865 to 1876 used a variety of cranes, including two significant examples of the Hercules type. Having little ...
1971 – OSHA passes 29 CFR 1926.550, which is the standard for cranes and derricks used in construction for the next 41 years. [3] 1995 – The National Commission for the Certification of Crane Operators (NCCCO) is established by the crane and lifting industry as a nonprofit organization to develop a certification program for crane operators.