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[SEAOC] Re: [SEAOC] micro soil nails

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Williams Form Engineering markets a product line called Manta Ray Earth Anchor 
Systems.  The low capacity anchors (range of 0.2 - 20 kips) involve the use of a
small plate at the end of a rod and can be installed with a jackhammer along 
with some special equipment which can be rented or purchased from Williams.  The
manufacturer's literature provides approximate holding capacities and embedment 
depths which are correlated with blow counts and soil type.  Equipment is 
available to test the actual capacity in the field.  The phone number for 
Williams Form Engineering is 616-365-9220.  The phone number for the 
manufacturer of the system (Foresight) is 800-325-5360.

John Hubert

______________________________ Reply Separator _________________________________
Subject: [SEAOC] micro soil nails
Author:  seaoc(--nospam--at) at SMTPMAIL
Date:    11/8/96 12:47 PM

I have had a couple of occasions recently to evaluate the use of small 
scale soil nails. Basically these would be steel stakes driven into the 
ground to anchor a building or canopy. Specifically, they will hold down 
a steel carport structure.
The soil nails, "stakes", are driven about 24-30 inches into the ground. 
The deformed bars (rebar?) are threaded at the top so that a nut can be 
installed to hold down a base channel.
I am not aware of any guidelines on their use, have never seen any 
testing or engineering data. There are no catalogs listing these and 
their capacities.
Does anyone on this list have any suggestions on how to evaluate these 
anchors? Is this all done by "feel" alone? Does the installer just 
monitor how far his hammer will drive the anchor per blow and apply some 
driving resistance factor? I am at a loss.
Any suggestions would be appreciated.
The loading on these small structures is due to 70 mph winds, no seismic 
to speak of. Roof loads of 20 psf.
Thanks, Ted
[Ted Partrick, PE       ]
[Structural Engineer            ]
[Building Inspections            ]
[City of Greensboro, NC         ]