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Re: [TowerTalk] Re-Bar Cage Advise

Subject: Re: [TowerTalk] Re-Bar Cage Advise
From: K4SAV <>
Date: Sun, 22 Jan 2006 10:30:56 -0600
List-post: <>
Yep, this will be heavy.  The US Tower website shows the rebar cage for 
the HDX589 as using #9 rebar at the corners and not #13. You are 
apparantly overdesigning it for some reason. Even the HXD5106 uses only 
#9. The cage using #9 and #4 rebar will weigh 301 lbs.  If you build it 
with #13 and #4, it will weigh 517 lbs. This will be hard to manage.  
Your estimate of 200 to 250 lbs is a bit off.

The cage for my HDX555 was only slightly smaller than that for the 
HDX589 (as shown on the US Tower drawings, 245 vs 301 lbs).  While 
wiring mine together, I used some 2x4 bracing to hold it.  I used my 
front-end loader to lower it into the hole.  It was somewhat wobbly but 
once I got it into the hole, I used rope to tie the corners to the 
stakes used for the wooden form at the top.  The concrete pour didn't 
move it.

If you use #9 rebar you should be able to do the same.  If you use #13, 
this will be significantly harder to handle during assembly and loading 
into the hole. And I wouldn't recommend getting into that hole.

Jerry, K4SAV

Gary E. Jones, Ph.D. wrote:

>I have fabricated several rebar cages for crank ups like HyGain HD-70
>and concrete guy point for Rohn 45 towers, but I now am trying to
>fabricate a rebar cage for a US Towers HDX-589 MDPL. I had no trouble
>with the others and simply bent the rebar as needed and used mild steel
>wire to tie it all together. They were unwieldy to work with, but not
>particularly heavy and I could work with them. 
>However, this rebar cage for the HDX-589 calls for double 8 foot lengths
>of #13 rebar at each corner which end up vertical in the whole, and 9
>horizontal rebar bracing rings spaced every one foot up the 8 foot
>vertical "sides". 
>Its hard for me to understand how this monster will stay together with
>just mild steel ties. I believe that you are really not supposed to have
>these cages welded together, but it is hard for me to imagine that it
>will stay together as it is lowered into the hole, etc., with just wire
>ties binding it all together. It really seems that the weight of this
>monster (about 200 - 250#) is going to make it mandatory to weld the
>cage together to keep it from distorting as it is lowered and set in the
>hole (and even, just to build). 
>Any advise out there with big cages like this one?  Any experience with
>welding them together?
>                Gary      W5FI 
>Gary and Dee Jones
>4510 Buckingham Drive
>Shreveport, LA    71107-9768
>    (House email address)
>(318)  309-2139  (House Telephone)
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