McMaster has 1.125 by 36" depth SDS-Max. $$ but I don't think you need
to go deeper than 18" - see the specs below.
I think it is very important to use the specified hole diameter for the
structural epoxy you plan to use. The Simpson catalog shows maximum
tensions for 1" bolts.
http://www.strongtie.com/ftp/catalogs/c-sas-2012/C-SAS-2012.pdf
Hole preparation is super critical, buy the Simpson wire brush to fit
the hole, use an air compressor, a blow gun extension, and also very
good eye protection.
Grant KZ1W
On 11/9/2013 11:37 AM, Mike VE3YF wrote:
Hi:
I have ran into a slight problem and need some help.
I am re-using my tower base for a new tower and the bolts that I
require are 1" x 27" and I have opted for the ASTM F1554 Grade 55, and
to leave 6" above the concrete which means 21" into the concrete.
However in my area all I can find for concrete bits that are 18" long
x 1.125" diameter.
However I can get a 22" bit x 1.250" Diameter
Is better to stay with an 18" x 1.125" hole and cut 3" off the bottom
of the bolt or go with a 22" x 1.250" hole and just add more epoxy.
Any help in this matter is greatly appreciated.
Tnx.
73 De Mike
VE3YF
http://www.ve3yf.com
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