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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