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Re: [TowerTalk] Looking for some foundation advice

To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Looking for some foundation advice
From: Steve Maki <lists@oakcom.org>
Date: Wed, 27 May 2020 19:34:36 -0400
List-post: <mailto:towertalk@contesting.com>
On 05/27/20 19:15 PM, Grant Saviers wrote:

Actually it is ok to pour concrete into a wet hole if the concrete is pumped in from the bottom. The water rises right out.  Not ok to drop concrete into water.  The mix plant, pumper and driver know how to adjust the mix a bit.

Hmm - that's not my experience. When we (drillers hired by me) install caissons for tall monopoles and self supporters with 30'-50' deep caissons, they just dump the concrete in. They use temporary cylindrical forms to prevent cave-ins, but pay little attention to the water down there. These operations are always monitored by 3rd party engineering firms. On the reports I usually see *freefall concrete placement*.

Or have a PE design a different base, there are all sorts of alternatives, plates, piers, wider and shallow, etc.  As long as the base resists the overturning moment and shear. The stock foundation UST wet stamp is on the web so should be a easy and quick job for a PE (unless they want a soils test, which in theory...  but local knowledge of conditions often is acceptable).

Agreed. A suitable foundation can be designed for above ground placement if you don't mind the ugliness and the concrete cost. The key is to get it engineered properly.

-Steve K8LX

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