Good physical connection between threaded rod and concrete is GOOD. Large
HD washers with a nut on both sides at intervals along the threaded rod help
make a good connection. Washers can be made from scrap steel plate with
holes drilled to accommodate the threaded rod. Making your own allows you
to have thicker/stronger washers. Jim said it well... Threaded rod,
galvanized is good. Plated is cheap and lasts poorly.
Patrick AF5CK
-----Original Message-----
From: Jim Thomson
Sent: Friday, August 23, 2013 7:18 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Base bolts for UST HDX-572MDPL
### Donb t mess with the UST 1 x 27 inch bolts. Since they are not
galvanized
they wont last very long. Galvanized NUTS will make a sloppy fit on any
NON galvanized anchor rod ! And if you use NON galvanized NUTS on any
NON galvanized anchor rods... both will simply rust. Then you will have one
helluva
time trying to tweak the nuts ...down the road.
## 27 inch long anchor bolts are not long enough . You have 6 inchs of
that sticking above the
finished concrete. And the concrete can be as much as 6-8 inchs above the
lawn. In which case,
the bottom of the bolts are only 13-15 inchs below the level of the lawn,
imo = fubar.
## I used 60 inch long, galvanized anchor rods, 104 ksi strength, ASTM
F1554 Gd 104,
and had a 6 inch thread cut on EACH end. To increase the uplift
capacity by a huge amount,
install the mating rectangular galvanized steel plate on the bottom of each
pair of anchor rods.
## I bought mine from from Portland Bolt..in Portland Ore..one of the
biggest suppliers of
anchor rods. They will make em any length you want. Get the mating heavy
duty galvanized
nuts and galvanized hardened flat washers. The heavy duty nuts are
slightly bigger than normal.
They will also supply you with the mating rect plates if you tell em the
exact dimensions you want...
and exact C to C hole spacing. A 1 inch anchor rod will require 1.125
inch holes be punched
in the rect plates. So 3 plates in total required.
## Then use never seize on all threads..at both ends of all rods. The
rectangular steel plates can be
installed well beforehand..and cranked super tight. Use a concrete
vibrator when pouring the
concrete. I used 5075 psi concrete. Cover the cement with old bed sheets
etc...and keep it moist
while curing, using a fine spay every 1-2 hrs....for several hrs.....esp on
a hot day.
## The ONLY thing holding the tower to the cement is those anchor rods.
Thatb s the absolute last place
you want to go cheap. Portland Bolt is the biggest supplier of anchor rods
on the west coast. There is
a similar co on the east coast that will supply the same product. Portland
bolt also has free shipping
on their anchor rods...so you can get the entire mess, rods, nuts , flat
washers, plates, etc... shipped
all in one shipment. Get a couple of extra nuts + washers... in case of
any problems. You will
need 4 x nuts and 4 x washers at the bottom of each pair of rod assy.
Ditto for the tops of rods.
24 x nuts, 24 x flat washers. So order 26 of each.
later.......... Jim VE7RF
Date: Sun, 18 Aug 2013 21:07:32 -0400
From: Les Kalmus <w2lk@bk-lk.com>
To: TowerTalk@contesting.com
Subject: [TowerTalk] Base bolts for UST HDX-572MDPL
I will be installing a UST HDX-572MDPL in a month or so.
The UST FAQ calls for 1"x27" anchor bolts; ATSM F1554 Gd.55.
I had gone through many of the very interesting TT archives where anchor
bolts were discussed but it's unclear to me if they have to be
galvanized. Do they?
I am in NY State near Kingston.
Can anyone recommend a place on the East Coast where I can get these and
they will actually know what I am talking about and I don't have to be
in the trade?
Thanks,
Les W2LK
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