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[TowerTalk] Erecting a tower with a block-and-tackle and gin pole

To: towertalk@contesting.com
Subject: [TowerTalk] Erecting a tower with a block-and-tackle and gin pole
From: "Donald Chester" <k4kyv@hotmail.com>
Date: Sat, 11 Aug 2007 17:50:32 +0000
List-post: <mailto:towertalk@contesting.com>
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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