[TowerTalk] Tower Foundation Pouring

[Hardy Landskov]

I agree with K6OK--this works. Here in Brooksville and most of Hernando
County the soil is pure sand down to about 12 feet. If you can dig the hole
and lightly spray the side walls with water so surface tension will not
allow the walls to collapse before the cement truck comes then that's the
way to go. I had to pump the concrete because if the truck gets too close
the walls collapse no matter what you do.
The form is a good way too, it's just more work. The rain will fill in the
voids with soil as we get a lot of rain here.
73 N7RT/4

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
Richard Solomon
Sent: Friday, February 03, 2017 3:16 PM
To: towertalk
Subject: Re: [TowerTalk] Tower Foundation Pouring

I think it's more than just an ..."urban myth"... .

>From what I have seen, it's recommended
by the Tower Manufacturer.

73, Dick, W1KSZ

On Fri, Feb 3, 2017 at 1:11 PM, JVarney <jvarn359 at gmail.com> wrote:

> There's an urban myth about "undisturbed soil." Hams believe that 
> pouring concrete against undisturbed vertical dirt walls is the only 
> way to place a footing.  It is often the easiest way to do it and is 
> perfectly acceptable, but when soils are soft it can be difficult to 
> do.
>
> The other way to pour a footing, commonly used in commercial 
> construction, is to over-excavate, build a full form, like this:
>
> https://goo.gl/MKNbLy
>
> After the concrete cures pull the form. Rent a "jumping jack" or 
> "elephant's foot" compactor. Backfill the dirt around the footing in 
> layers, then compact it
>
> https://youtu.be/lYndguhIEQc
>
> Done carefully and with a high level of compaction the footing will be 
> as good as if the undisturbed soil method was used.
>
> 73 Jim K6OK
>
> Paul W9AC wrote:
>
> >> Despite efforts to brace the walls from blowing out as concreate 
> >> was added, we still had slight bowing on the
> >> 140 ft. tower base (a 10 ft. x 10 ft. square).  That resulted in a 
> >> less than perfect square on two sides of the top surface.
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