Hi K9IL,
I don't know if your location experiences frost or not, but if the ground
does, indeed, freeze-up where you are, bank on a hole depth of no less that
4.5-feet, on penalty of the whole affair "heaving" after the onset of just
one winter...
I've had two self-supporting steel towers installed in my lifetime---48-feet
tall---and the prescribed hole-in-the ground for the concrete base is a
4-feet per side, 4.5-feet deep, & with the bottom foot "belled" outward
around the base.
It took about 3, to 3.5 cubic yards of pre-mixed cemet to fill the hole.
~73~ de Eddy VE3CUI - VE3XZ
****************************************************************************
********************
----- Original Message -----
From: "Bill Coleman" <aa4lr@arrl.net>
To: "r miles" <greenacres113@charter.net>
Cc: "towertalk" <towertalk@contesting.com>; "antennas"
<antennas@mailman.qth.net>
Sent: Tuesday, May 03, 2011 8:30 AM
Subject: Re: [TowerTalk] Bag concrete question
>
> On Mar 28, 2011, at 6:53 PM, r miles wrote:
>
> >
> > I just purchased a used HyTower & I'm getting ready to dig the hole.
> > I've poured a bit the concrete before. Either redi-mix or small bag
> > jobs. I have looked several places at the 60 lb. homeowner type bags.
> > Those are OK but my question is cubic volume. None of the 60 lb. bags
> > show cubic volume. I'm guessing it's 1 cubic foot of concrete in one of
> > those. Anyone know what the cubic value is?
> > K9IL
>
> If you have more than one cubic yard to pour, I would strongly suggest a
ready-mix concrete service instead of trying to mix your own.
>
> If you have less than a cubic yard, you might consider doing it yourself
with bagged concrete. It really isn't that hard to work with, you just have
to be able to lift the 60-90 lb bags. Don't hurt yourself.
>
> If you are mixing more than 3-4 bags, I would STRONGLY recommend renting a
small mixer at your local home construction store. Much less work than
trying to mix a bag at a time in a wheelbarrow.
>
> My Rohn 25 tower base took 28 bags of concrete. I wrote about it here on
my blog:
>
http://boringhamradiopart.blogspot.com/2009/01/putting-up-tower-pouring-foun
dation.html
>
> The picture quality isn't great, but you do see a picture of the small
electric mixer I used, plus my technique for doing the pour. Pouring the
base took about 2 hours of constant work.
>
>
> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
> Web: http://boringhamradiopart.blogspot.com
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
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