[TowerTalk] screw anchors (was Welding Rebar)
hanslg at aol.com
Mon Jan 6 16:00:44 EST 2014
I don't see any problems with screw anchors. Anyone what havae had any problems with them The one I use are, according to the manufacturer's spec., good for a pulll force of 14,400 # in undisturbed,dry sand.
Hans - N2JFS
From: Wayne Kline <w3ea at hotmail.com>
To: Roger (K8RI) on TT <k8ri-on-towertalk at tm.net>; towertalk <towertalk at contesting.com>
Sent: Mon, Jan 6, 2014 1:51 pm
Subject: Re: [TowerTalk] Fwd: Welding Rebar
I think we all have a few OMG or WTF regarding tower/antenna installation and
Field Day. are a prime example of Elmer's rule ( If it did not fall down it
was not big enough or high enough )
I personally know of a statin that had 5 towers 4 100' & 1 80' guyed with 3/16
ehs three levels on the 100' and two levels on the 80
all with mono band beams one being a full size 40 meter beam and there were
screw in anchor's and NO I repeat NO concrete
anywhere . the bases being Rohn 25 hinge plates bolted to 2' X 3' steel plate
and a three or four rebar's 1/2 dia pounded in the soft wet ground.. last for
many many many years
Date: Mon, 6 Jan 2014 03:26:43 -0500
> From: K8RI-on-TowerTalk at tm.net
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Fwd: Welding Rebar
> On 1/6/2014 12:58 AM, Hans Hammarquist wrote:
> > I believe K2TTT put one tower up using nothing as a base, just the tower
standing on a small plate, resting directly on ground. Yes, it is (was) guyed.
> Over the years (since 61) I've had 7 towers up using dirt bases. They
> were only 40-50' with one 60 footer, and one 90 footer, all guyed. I
> had a 5L 20M KLM, 6L 15M KLM,(42' booms) and a 7L Wilson 10M Yagi on a
> 39' boom. One was 90' with a Cushcraft ATB34 It's a rather rugged dirt
> base and in solid soil, I'd not hesitate to go 90 feet with 25G, but
> avoid those towers that only have the horizontal bracing.
> http://www.rogerhalstead.com/ham_files/Dirt_Base.htm I'd consult an
> engineer for higher or different soil. I over guyed the 90 footer which
> was a mistake. The extra weight and proper tension of the larger steel
> guys put an excessive vertical load on the tower causing the bottom 3
> sections to bell out where they join, requiring a hydraulic jack to get
> them apart.
> Roger (K8RI)
> > Dave, am I correct?
> > Hans - N2JFS
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