Thanks, Jim:
Both AB Chance-Hubbell and MacLean Power Systems sell them for utility
applications:
http://www.hubbellpowersystems.com/anchoring/expanding/
http://www.macleanpower.com/products/item.asp?ITEM_ID=2087
Except for the W8JI site, I have never seen any mention of them as an
option for ham radio towers.
I noticed that one of the entries in the table you linked to showed a
depth of 73ft! I can't imagine that would be the requirement to get a
good anchor, so perhaps that's how deep they had to go to get into the
soil conditions that are listed.
73, Mike W4EF...........
On 11/9/2013 6:22 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"
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.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|