In a message dated 9/6/2007 4:49:56 P.M. Greenwich Standard Time,
1. Do I really use rebar for my CB2 hole? If so, what are the lateral ties
shown? Are they rebar or wire? I presume they hold the four vertical rebar
pieces rigid? If that is there only purpose, could I not just push the four
vertical pieces into the wet concrete afterwards, making sure I got at least
3 inches below the concrete surface and did not come out the bottom?
2. Since the drawing also covers the foundation for Rohn 25, I never heard
of anyone putting rebar into a 25 hole around this area. Could someone please
clarify this for me.
3. Below the 4 foot level bottom of the hole, how much more do I have to dig
to put gravel for drainage? I have a pile of 5/8" minus I use for filling
in the driveway holes that I would use.
1. I believe the rebar is necessary only if you mount it on a plate with no
base of the 45 in the concrete. Most guys do not do it that way and most
guys do not use the rebar in the base. I have never heard of the base
and failing in any of these instances. Number 5 rebar is pretty cheap and
you would only need one 20 foot piece to do the outside corners if you want
the insurance. Do not allow the rebar to protrude as it can rust underground
and eventually corrode the rebar in the concrete....allowing it to weaken at
2. Same story with 25.
3. I believe the amount of gravel necessary is about three inches. In any
case, make sure the legs of the tower are all the way into the gravel bed.
The purpose of the gravel is mainly to allow the legs to drain. If you have
heavy soil the legs can clog and cause some major deterioration from rust in a
hurry. Oh, by the way, be sure the legs of the tower are not plugged before
you put it in the hole. If you have stood the tower on end it can happen,
especially if you have clay soil.
I hope this helps. Now back to putting the rest of the steel in my base for
my Rohn 55.
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