[TowerTalk] Fwd: Tower guy anchors

[Hans Hammarquist]

Iwas told by the manufacturer I purchased my 6” screw anchor from,that they had a pull-out strength of 14,000 # when screwed in toundisturbed sand. I have no way to confirm this as I no longer havethe documents which manufacturer it was and my ground is hard packetclay, the type you have problems driving a 4” nail into;.


Yes,it was hard to get the screw anchors in place and my guess is thatthey will never ever be removed,.


Best73 de,


Hans- N2JFS



-----Original Message-----
From: Roger (K8RI) on TT <K8RI-on-TowerTalk at tm.net>
To: towertalk <towertalk at contesting.com>
Sent: Fri, Nov 8, 2013 11:53 am
Subject: Re: [TowerTalk] Tower guy anchors


On 11/8/2013 10:05 AM, Vincent Weal wrote:
> I am planning to install a 70-80' Rohn 45 tower and guying it with
> Phillystran. The area where the tower is going has very sandy soil - the
> kind that just falls back in on itself when you try to dig a hole. Also I
> have a very high water table, maybe 18-24 inches below the surface (yes it
> stays swampy all summer but is dry by mid-November.)

One of my anchors for a heavily loaded 100' 45G is in something akin to 
peat. No cohesiveness. We dug the hole only to come back in the morning 
to find a shallow depression about 12 to 15 feet across and a foot deep. 
   I went with a large block of concrete which should work with sand as 
well.  The size?  You really need to talk with an engineer for the 
figures.   No raised guy anchors as the soil has little resistance to 
over turning and the block needs to be large enough to overcome any 
dragging possibility and with your soil characteristics, you really need 
that engineer to come up with those numbers.  You could forgo the 
engineer cost, put a fortune in concrete and hope for the best.  The 
engineer would likely be cheaper if he only has to give a 
recommendation, rather than a stamped plan.

73

Roger (K8RI)
>
> The base is already installed and currently supporting a small self
> supporting tower. My concern is the guy anchors, specifically what kind I
> should use. I've read a lot on the subject and emailed some of the experts
> on the issue (nobody emailed back) so I'm turning to this group. I'm afraid
> screw-in anchors would be too loose in the wet sandy soil, and if I dig
> holes for concrete block anchors there wouldn't be enough undisturbed soil
> left to be effective. Has anyone else dealt with a similar situation?
> Thanks in advance, Vince K4JC.
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