I recall reading an article in a pre-WWII radio publication about raising a
100-ft tower entirely with a gin pole, requiring no climbing or crane. The
tower was fully assembled on the ground, and the guy wire lengths were
precisely calculated using a transit level, and cut to length. Two sets
of permanent guys were connected to their anchors, while the third set was
left unattached. A temporary set of guys was attached to the tower and to
the top of a rigid pole, which was then hoisted to a vertical position. A
couple more temporary guys were attached to the top of tower, anchored 180
degrees apart.
The tower was now lying on the ground, with the rigid pole (about 1/3 the
tower height) in a vertical position, at a 90-degree vertical angle from the
tower. Using a block-and-tackle arrangement, the vertical pole was slowly
pulled down to a horizontal position, which in turn hoisted the tower to the
vertical. Once it was fully vertical, the remaining set of permanent guys
was attached to its anchor.
Only after the permanent guys were fully attached and given the final
adjustment and the tower plumbed, someone climbed the tower to detach the
temporary guys and install the antenna.
I believe this same technique was used by the Signal Corps to quickly erect
towers under battlefield conditions during WWII.
Don k4kyv
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