[TowerTalk] Tower foundations

[Bob Maser]

My neighbor who is in construction says all I have to do is dig around the existing block and drill some holes in the side and push some rebar into the holes.  I'm planning on putting more rebar where the new concrete will go.  As for depth, I plan on leaving the original depth at 3 feet and go to 4 feet where the new concrete "surround" goes.  From what I've been reading, the cementing should be no problem.

Bob W6TR
  ----- Original Message ----- 
  From: Jim Lux 
  To: Bob Maser ; garyschafer at comcast.net ; 'Talk Tower' 
  Sent: Monday, February 12, 2007 5:54 PM
  Subject: Re: [TowerTalk] Tower foundations


  At 12:27 PM 2/12/2007, Bob Maser wrote:

    I'm not worried about saving 1 yard of concrete.  I want to put the new 
    tower in the same location as the old one(wife's requirement) and I believe 
    that a yard of hardened concrete weighs too much to just pull it out of the 
    hole and start over.

  Are you going to then just dig around it?  you said the new base would be 4 ft deep and the old one is 3 ft.. So you're going to raise the top surface a foot, as opposed to digging under the block, or leaving the old block sitting up on a soil pedestal 1 foot high? 

     There's a bunch of funky things you can do to bond the old and new concrete together, but I don't know if they're needed in your case.   I've been watching them widen a freeway on my daily commute, and there's all kinds of things they do with respect to bashing off the old wall on the side of the bridge, casting the new slab next to the new one, and building the new side walls.  Freeway construction is probably a bit different than antenna bases, though. Fascinating to watch.. they grind up all the old concrete to be used as aggregate (or maybe gravel footing under the new concrete).  I still haven't figured out if the big grinder is rebar immune...



    Bob W6TR
    ----- Original Message ----- 
    From: "Gary Schafer" <garyschafer at comcast.net>
    To: "'Bob Maser'" <bmaser at tampabay.rr.com>; "'Talk Tower'" 
    <towertalk at contesting.com>
    Sent: Monday, February 12, 2007 2:31 PM
    Subject: RE: [TowerTalk] Tower foundations


    > For the cost of saving one yard of concrete I would think it would be a
    > whole lot more expensive and work than starting over.
    >
    > 73
    > Gary  K4FMX
    >
    >> -----Original Message-----
    >> From: towertalk-bounces at contesting.com [mailto:towertalk-
    >> bounces at contesting.com] On Behalf Of Bob Maser
    >> Sent: Monday, February 12, 2007 1:04 PM
    >> To: Talk Tower
    >> Subject: [TowerTalk] Tower foundations
    >>
    >> I have a 3x3x3 foot concrete foundation in my front lawn that I have been
    >> using for my HyGain HyTower antenna.  MY plan is to remove the HyGain and
    >> enlarge the foundation to 6x6x4.  I have heard that it is possible to
    >> hammer
    >> drill holes in concrete, pour in a 2 part epoxy, and insert threaded rods
    >> and this will be strong enough to be used for attaching a tower.  I want
    >> to
    >> put up 60 feet of Rohn 65 and have it be self supporting unless a
    >> hurricane
    >> comes through the area, in which case I would put temporary guys on the
    >> tower.  Does anyone have experience with this epoxy method and can give 
    >> me
    >> some direction on doing this?
    >>
    >> Thanks,
    >> Bob  W6TR
    >>
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