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Re: [TowerTalk] Concrete for tower base

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Concrete for tower base
From: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 12 Nov 2019 13:39:06 -0700
List-post: <mailto:towertalk@contesting.com>

Why not just add some vertical lumber screwed to the outside of the form to raise the base-supporting lumber high enough to trowel underneath it?   The tower base extends 16 inches above the finished concrete so I don't see the problem.  If you need more clearance than could be had with wood for the horizontal portion that holds the tower base, use some steel angle stock ... such as this:

https://www.lowes.com/pd/Hillman-1-1-2-in-W-x-1-1-2-in-H-x-6-ft-L-Zinc-Plated-Steel-Perforated-Slotted-Angle/3059263

73,
Dave   AB7E


On 11/12/2019 12:55 PM, Art Greenberg wrote:
I'm putting up a tower soon, and I have questions about working with concrete.

The tower will the a Tashjian WT-51.

The hole is 2.5ft x 2.5ft, 5.5ft deep and the concrete extends 6 inches above 
grade for a total foundation height of 6ft. The instructions for the tower base 
call for it to be suspended in the hole while the concrete is poured. The 
instructions show a form around the top of the hole and additional lumber is 
used to suspend the base, sitting on top of the form. The concrete is to be 
poured to level with the top of the form, which means its just touching the 
underside of the lumber used to suspend the base. So the presence of the lumber 
suspending the base in the hole will be in the way of fully finishing the top 
of the concrete.

(a) How long do I have before the top surface of the pour cures too much to 
permit fully working the finish?

(b) How long should I allow the concrete to cure before I remove the lumber 
suspending the tower base?

Thanks.


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