[TowerTalk] Installing new anchor bolts in existing foundation

[Bruce Osterberg]

Good Morning Rich:

Well to begin with you can go to Mcmaster Carr and buy the rod in two foot 
lengths in any hardness but grade 8 will give you 125,000 psi.

There is a company called Power-Fast that makes an excellent two part epoxy, 
(many more I am sure), they have a web site.  But I will summerize what they 
have for 4000 PSI concrete .

This is 4,000 PSI COncrete.

1 Inch Rod    Drill a 1-1/8 Hole  at a Depth of 12 inches.  This will give 
you Tension of 80,605 lbs  with a shear of 53,135.  You would also be able 
to apply about 250-300 FT-LBS of torgue to the bolts.

SEE page 17 of their on line Manual.

They will also explain what tension and Shear mean.

Good Luck!  73
Bruce N9BX

By the way the cost for the epoxy, applicator, etc, is around $67.00 
Dollars.





N9BX 73 Bruce





>From: "Rich Hallman - N7TR" <rich at n7tr.com>
>To: <towertalk at contesting.com>
>Subject: [TowerTalk] Installing new anchor bolts in existing foundation
>Date: Sun, 5 Sep 2004 23:05:57 -0700
>
>I have an existing Concrete foundation (13Yds of 4000 PSI Concrete) that
>I need to install Anchor Bolts for an HDX-572.
>
>I have read in the archives some mention of Epoxy and Mechanical
>Anchors.
>
>Let me know what has been used and what is best practice.
>
>Also...Where can I find the 1 Inch Threaded Rod (Assume Galvanized) that
>I need?  Recommended Depth of the rod?
>
>Thanks...
>Rich
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