Phil
See attached overview and formula for footing sizing:
http://amfone.net/Amforum/index.php?action=dlattach;topic=31980.0;attach=33399.
Use equation 6 and first calculate the capability of the tower manufacterers
footing. If you calculate values which don't make sense check you calcs and
confirm you have all your inputs correct. Your replacement footing must meet or
exceed the overturning capability of the manufacturers footig. You will need
the tower manufacterers recommendation for soil pressure and for applied load
the tower is designed for.
>From the free body diagram and resulting relationships, increasing depth of
>the footing gets more performance for overturning moment than increasing face
>width. Footing weight is not main driver for performance, but the reaction
>against the soil adjacent the footing. Soil pressure capability is also
>important.
Paul - W2NMI
----- Original Message -----
From: Phil <pmills7@comcast.net>
To: towertalk@contesting.com
Sent: Wed, 01 May 2019 15:45:28 -0400 (EDT)
Subject: Re: [TowerTalk] Question altering concrete base dimensions Hygain
HG-52SS/thanks to all
I'd be interested in the responses to this question.
Why don't people use "reply all" to topics of general
interest?
Could whoever Paul is please post his information on
the proper formula?
thanks, 73, Phil W5BVB
On 5/1/2019 11:18 AM, AB2E Darrell wrote:
> Thanks to all who replied.
> Thanks to Paul W2NMI for providing a copy of the proper formula to calculate
> the necessary size.
>
> Will update you after the dig.
>
> 73 to all,
> Darrell AB2E
>
>
> ________________________________
> From: TowerTalk <towertalk-bounces@contesting.com> on behalf of AB2E Darrell
> <ab2e@hotmail.com>
> Sent: Tuesday, April 30, 2019 8:48 PM
> To: 'towertalk'
> Subject: [TowerTalk] Question altering concrete base dimensions Hygain HG-52SS
>
> Greetings All,
> I have a question for the gurus, could not find any specific info on this.
> The specs in the manual for the Hygain HG-52SS crankup self-supporting tower
> are 3.5x.3.5x5.5 ft for the concrete in the base.
> This is approx 67 cu ft, or roughly 2.5 yards of cement. My water table is
> high, somewhere around 4ft in places I have done a sample dig.
> So long as I keep the same or greater volume of cement, is it OK to modify
> the dimensions of the base some?
> I'm thinking 4X4X4.5ft, this would be 72 cu ft, or almost 2.7 cu yd. I could
> also easily make it 5x5x4 ft which would be 3.7 cu yd.
> So I would be expanding length and width by 6 inches each, and taking 1ft off
> of the depth of the first scenario, and expanding 1.5ft length and width, and
> shortening 1.5ft depth on the 2nd scenario.
>
> Any thoughts on this?
>
> 73 Darrell AB2E
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