[Boatanchors] TOWER ERECTION
Mr Bill Mellema via Boatanchors
boatanchors at mailman.qth.net
Wed Jul 1 06:58:57 EDT 2015
Guys,
i did the same thing as Jim...but you need to make sure water doesn't lay around the base of the tower legs. I used a good rust preventative on the legs and the tower was up 30 years with no problems.
73's
Bill N3WM
From: Jim Wiley <jwiley at gci.net>
To: W4AWM at aol.com; boatanchors at mailman.qth.net
Sent: Tuesday, June 30, 2015 8:54 PM
Subject: Re: [Boatanchors] TOWER ERECTION
I respectfully disagree. Rohn sells "half sections" of tower
specifically intended for insertion in wet concrete for use as tower
bases. I will take a chance here and say that Rohn's engineers probably
know what they are doing.
Also, I put up a 110 foot stick of Rohn 65G n 1970, and 35 years later
it was still sound. Took it down due to a relocation in 2005.
I buried the first 20 ft by boring a hole 10 ft deep by 3 ft diameter,
and inserting the 20 ft first section into the hole as a base. The
remainder of the section stuck out of the hole to 10 ft above grade. I
then poured concrete in the hole, using the tower section cross bracing
as rebar. It was easy to set the tower plumb by simply dropping a plumb
line from the top of the section to ground level.
When the concrete was "set", I assembled 5 sections (100 ft) on the
ground, and then put up the rest of the tower in one piece with the aid
of a local crane operator. Installed 2 sets of guys, one set at 45 ft
and the other at 90 ft.
Got pix somewhere.
- Jim,KL7CC
On 6/30/2015 4:33 PM, John via Boatanchors wrote:
> <snip>
>
> Burying a tower section for use as a base is not a good idea. Eventually
> corrosion and chemicals will take their toll.
>
> 73,
>
> John, W4AWM
>
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