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## [Towertalk] 'Toes' of a tower concrete base

 To: [Towertalk] 'Toes' of a tower concrete base SPELUNK.SUENO@prodigy.net (EUGENE SMAR) Sat, 29 Jun 2002 22:32:24 -0400
 ```Dave et al: My responses below. 73 de Gene Smar AD3F -----Original Message----- From: David Jordan To: EUGENE SMAR Cc: ac7nj@bentonrea.com ; blueis@sprintmail.com ; TOWERTALK@contesting.com To: Date: Saturday, June 29, 2002 9:01 PM Subject: Re: [Towertalk] 'Toes' of a tower concrete base >YUP, It might sink all the way to China! > Nope - just to bedrock or some other, more-dense material that WILL support the weight. 1997 UBS Volume 2 Table 18-I-A, Allowable Foundation and Lateral Pressure, shows that clay soil (among others) can be considered to have an allowable foundation pressure of 1,000 psf. For a 7X7 = 49sqft foundation, that would be 49,000 pounds of concrete-plus-structure that could be supported in clay-like soil. If there's too much weight, or if it's the wrong type of soil, then the dirt can't hold it up. > Please, an extra cubic yard of concrete isn't going to make any >difference other than cost him another \$85 buck. Do the math: 5X5X5 = 125 cuft for the basic cube of the foundation. 2X7 + 2X5 = 24 cuft for the toe around the perimter of the foundation Total for engineered design = 149 cuft/27 = 5.52 cuyd 7X7X5 = 245 cuft/27 = 9.07 cuyd for oversized hole. At ANY concrete price, the larger hole would cost 9.07/5.52 = 1.64 times more than the proposed, engineered design. It would also be 1.64 times as HEAVY as the proposed, engineered design. Are you SURE that another few yards of concrete wouldn't hurt? The toe for his >application is useless. All one has to do is go back and look at the >instructions for the very same tower published in 1960-70-80... > Maybe the engineers got smarter over the years and changed their design to reduce costs, making their tower more affordable? ```
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