[TowerTalk] Screw-in guy anchors for 48' 25G installation?

[Grant Saviers]

The rock sounds not good for setting anchors.  Bobcats have hydraulic 
anchor/auger drive attachments, you might be able to rent one.  Also 
pretty common with post mount solar panel installers.  A prior QTH 4 
post mounted panels were building dept insanity 9' deep by 3' diameter 
holes drilled with a Bobcat.  3 of 4 for the 10" pipe were easy.  The 
4th boring hit rock and the bobcat was spun 90 degrees.  Awesome.

That much torque would probably twist off a Rohn anchor shaft.  Better 
slow, safe, and sure and dig the rather small buried concrete deadmen 
for R25.

Grant KZ1W



On 7/24/2020 11:55, John Simmons wrote:
> Power line people do this all the time, but they have no-concrete 
> anchors with much more holding strength. Soil type will greatly affect 
> the anchor strength of screw-in anchors. Clay is good, sand is bad. 
> Power line pole anchors are installed with a machine which can test the 
> pull strength. SOMETIMES the local power company will put the anchors in 
> for you, at correct angle and rating. Nowadays this is becoming 
> increasingly rare- think liability and 'company policy'.
> 
> -de John NI0K
> 
> Edward Post III wrote on 7/24/2020 1:27 PM:
>> Designing my 2ndary tribander tower (large ish tribander e.g, JK Mid 
>> Tri 98lbs 16 sq ft or too big?) with 48' of 25G I now have.
>>
>> Going to mount first section of 25G to small barn at 7-8', put some 
>> concrete anchors in the 25G base and put 1 or 2 sets of guys at the 
>> appropriate levels per Rohn catalog.
>>
>> Question is can I get away with screw in anchors (e.g. Rohn GAS625 4' 
>> screw-in anchor (DXE web site) or the like) for this use case or must 
>> I go with concrete anchors per Rohn catalog to be safe?
>>
>> 2nd question, might utility pole anchors be better and if so where to 
>> source and how best to get into soil with lots of rock .. what kind of 
>> machine if any?  Are there pros who do this?
>>
>> Thanks in advance
>>
>> Ed W2MKM
>>
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