[TowerTalk] Question altering concrete base dimensions Hygain HG-52SS/thanks to all

[Paul Dulaff]

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 at comcast.net>
To: towertalk at 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 at contesting.com> on behalf of AB2E Darrell <ab2e at 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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