[TowerTalk] Deviation from plumb

[Mac]

Larry's original question dealt with a 'free standing tower' i stand by 
my original presumptions it should not move, free standing towers depend 
inherently on deep engineered base footings and typically massive 
concrete and steel construction. The 4 conditions/situations Bob 
outlines below are interdependent and much more related to guyed towers.

Sure no one is guaranteed immunity, but if done following the engineered 
instructions, free standing towers should exhibit a high resiliency from 
all of these 4 conditions.

With the experience and extensive reader base of this list there will be 
or have been exceptions, i have no doubt.

73  mac/mc  w5mc

On 7/8/2019 1:29 PM, Bob Shohet, KQ2M wrote:
> I can think of several reasons that a tower gets out of plumb:
> 1) Settling of ground around the tower base – especially when it is an 
> asymmetric combination of ledge and dirt  - just look at what happens
> to the doorjambs inside of houses – where the cracks appear.  Also 
> foundation cracks seen in the concrete on the basement walls and 
> basement floors.
> 2) Minor earthquakes – Richter 1 – 2 range – the kind that you don’t 
> even feel or notice – we get those here in Connecticut
> 3) Hurricanes, tornados and damaging wind events – thankfully 
> infrequent but can certainly stretch the guys unequally (especially if 
> you have substantially different length guys like I do), physically 
> twist the tower, etc.
> 4) Large Ice storms with heavy ice which puts tremendous additional 
> weight on the tower and guys – even worse if there are strong winds 
> pushing on the heavily ice-encased tower and guys.
> I have to realign the tower every so often by adjusting the guys to 
> straighten the tower and then resetting the tension on each guy. Each 
> tower and every guy wire should be rechecked at least annually and 
> preferably after a very severe storm.
> Bob  KQ2M
> *From:* Mac <mailto:libbysales at austin.rr.com>
> *Sent:* Monday, July 08, 2019 12:32 PM
> *To:* towertalk at contesting.com <mailto:towertalk at contesting.com>
> *Subject:* Re: [TowerTalk] Deviation from plumb
> not much, if any..
>
> it would drive me nuts if were not "plumb"  no reason for it really ..
>
> but it sounds like ur circumstances mite have one..
>
> best:  mac/mc  w5mc
>
> On 7/8/2019 10:34 AM, Larry Horlick wrote:
> > What is the maximum deviation from plumb for a freestanding tower?
> >
> > Larry
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