A gin pole, derived from gyn, is a supported pole that uses a pulley or block and tackle on its upper end to lift loads. The lower end is braced or set in a shallow hole and positioned so the upper end lies above the object to be lifted. The pole (also known as a mast, boom, or spar) is secured with three or more guys. These are manipulated to move the load laterally, with up and down controlled by the pulley or block. Gin pole can also use a guide for building a tower.
Gin poles are also used to raise loads above structures too tall to reach with a crane, as placing an antenna atop a steeple, and to lift segments of a tower atop one-another during erection. When used to create a segmented tower, the gin pole can be detached, raised, and re-attached to the just-completed segment in order to lift the next. This process of jumping is repeated until the topmost portion of the tower is completed.
- Patton, William Macfarland. A treatise on civil engineering. New York: J. Wiley & sons, 1895. 1214.
- Australia, Emergency Management (2006). General and disaster rescue skills for emergency services personnel (PDF) (5th ed.). Dickson, A.C.T.: Emergency Management Australia. pp. 131–132. ISBN 1921152028. Retrieved 5 July 2014.
|Wikimedia Commons has media related to Gin poles.|
- Notes & drawings
- tower contractor's description with diagram
- instructions with illustrations for erecting a jin-pole as part of a mast
- jin pole regulations in Ca.
- jin pole failure leads to lawsuit april 15, 1948 in philadelphia
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