On 11/9/2013 9:22 AM, Jim Lux wrote:
On 11/9/13 12:26 AM, Michael Tope wrote:
Except for mention on W8JI's website, I haven't seen much mention of
"bust open" anchors as an option for amateur tower guying:
http://www.w8ji.com/screw_in_guy_anchors.htm
I'd be curious to know if they would be a good choice for very sandy
soil.
You'd need to talk to the anchor mfr.. That rusty thing on W8JI's site
is interesting looking, but some casual googling didn't turn up
anything useful.
The screw in anchors that are shown on that page are tiny little
things, compared to some of the ones I've seen.
Here's a report from A.B. Chance (who make anchors) on "cohesionless
soil"
An anchor in a truly cohesionless soil is an oxymoron. An anchor would
simply behave as if in water. They may be talking of poor cohesion and
calling it cohesionless. Such an anchor for soil with poor cohesion
will be big and heavy. Even then, it may (is likely to) move with time.
73
Roger (K8RI)
http://www.abchance.com/wp-content/uploads/2012/07/01-9411.pdf
I'm not sure what the test condition was.. they're applying a
specified load and reporting the deflection.
kips = 1000 pounds force.
so the first line, an 8 inch helix installed 19 feet down, shows
45,000 lb force with a deflection of 0.311 inches.. I assume the force
is axial, but it doesn't say that.
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