A gin pole is a unique tool used in the erection of radio, television and other towers. The gin pole extends beyond the high point of the tower during construction and serves as fulcrum for pulleys used to raise or lower tower components. As each new segment of the tower is lifted into place the gin pole is raised and attached to the new segment. Rigging a gin pole can be accomplished by following these steps.
Pass the rope through the pulley at the top of the gin pole. Rig the rope or cable before the gin pole is attached to the tower. The end of the rope the load will be attached to, the tag end, passes through the pulley going up the side of the pulley closest to the tower.
Bring the free end of the rope to a control point at the bottom of the tower. The simplest rig of a gin pole is simply a rope run through a pulley with both ends of the rope at the bottom of the tower.
Pass the free end of the rope through a pulley mounted at the base of the tower. This removes the ground worker from the area at the base of the tower in case of any sort of failure that results in tower components falling.