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Re: [TowerTalk] Anchor bolts for LM470

Subject: Re: [TowerTalk] Anchor bolts for LM470
From: K8RI <>
Date: Mon, 16 Apr 2012 00:44:33 -0400
List-post: <">>
On 4/15/2012 10:39 PM, Mike wrote:
> Dave,
> That's what I was thinking as well.  I have seen people cut off and weld the
> three LM-470 bolt Ears to a US-Towers "T-Base" which works, but I do not
> understand what this is about.

"My thoughts!":

The bolt head, J, flag, or plate only needs to be big enough to prevent 
the anchor from turning, pulling out, or over stressing that small area 
of concrete.  I think J-bolts are by far the cheapest and easiest to 
make if you do-it-yourself.

As for "All Thread" which is plain old threaded rod, isn't it a bit soft 
to use? I've never seen it except in ungraded strength.  I've been 
planning on using 1" or 1.25" bolts, 3 feet (give or take and boy are 
they heavy!) long with a 1/4" X 6 X 6 or even 4 X 4 flat plate welded on 
the bottom and a couple of 1/4" thick ears welded on the sides at the 
base for my projects.  The thing about hard bolts is they rust more 
easily so they have to be protected. You can also tape the threaded 
portion that goes through the base. I'll be using a separate base so the 
plans call for the bolts to be installed in the base which will then be 
lowered over the hole.  The base needs to be leveled and secure  before 
the concrete is poured and care used to completely encase the bolt heads 
in concrete with no voids.  Protect the threads to allow for re leveling 
the base and removing the base after the concrete has cured. Use Tape, 
Saran Wrap(TM) or what ever comes to mind.  Then warm them up to about 
50C and liberally coat them with thinned tar. If necessary recoat with 
tar about twice as thick as the original coat.  If the bolts are clean, 
dry, and fairly warm (or hot) the tar will uniformly adhere and not come 
off.  it stinks but it works. Also you can get the nuts off if you ever 
need to. Just don't heat them enough to take the temper out which is 
really hot.

Undoubtedly there are others on here who have alternate methods of 
protecting the base hold down bolts.


Roger (K8RI)
> Mike, K6BR
> -----Original Message-----
> From:
> [] On Behalf Of Dave Hachadorian
> Sent: Sunday, April 15, 2012 7:29 PM
> To: Towertalk reflector
> Subject: Re: [TowerTalk] Anchor bolts for LM470
> So how are you guys using anchor bolts on an LM470?  Has someone designed an
> LM470 mounting plate that fits on anchor bolts?
> Normally the LM470 mounts on a special base section that is buried in
> concrete.  If you want to move the tower, you have to buy another base
> section from the factory.  What are you guys talking about?
> Dave Hachadorian, K6LL
> Yuma, Arizona
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