[TowerTalk] Tower Guy Anchors

[Roger (K8RI) on TT]

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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