[TowerTalk] Pier pin vs. burying in concrete

[Barry Kutner]

On 1 Jun 01, at 6:01, n4kg@juno.com wrote:

> There has been a lot of speculation that the downward
> forces on the base plate would prevent rotation about
> a pier pin.  I know of one example where I'm sure there
> was enough torque to rotate about a pier pin.
> 
> N4AR has a pair of 200 ft R45 towers with the bottom
> sections in concrete.  One of these towers has a 4 high
> stack of CC 4L20's.  After a tornado passed by his QTH
> he was cleaning up around the base of the tower when a
> finger went down into a hole.  The tower rotated enough
> to SHEAR OFF all 3 legs!
> 
> de  Tom  N4KG
> 

Makes me wonder if his guys were properly tensioned.
Barry
--
Barry Kutner, W2UP              Internet: w2up@mindspring.com
Newtown, PA         FRC         alternate: barry@w2up.wells.com

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