Hygain tower bases use welded rebar. The 1/4" thick steel tabs thru which
the tower mounting bolts connect to the matching tabs on the tower are
thoroughly welded to three rebar legs tied together with smaller rebar
crossties and diagonals using tack welds. The result is an integrated
cage/anchor system. The whole thing is suspended from the concrete form
boards and plumbed vertical before the mix is poured. The stress analysis
package includes drawings with proper weld callouts showing the rebar welded
to the 1/4" plates. Makes a pretty heavy assembly; but welded it is!
Chuck, N4NM
From: <K7LXC@aol.com>
To: <kbgreen@worldnet.att.net>; <barryb@i1.net>; <towertalk@contesting.com>
Sent: Sunday, January 27, 2002 11:57 AM
Subject: Re: [TowerTalk] Foundation too close to Tower??
>
> In a message dated 1/27/02 6:53:22 AM Pacific Standard Time,
> kbgreen@worldnet.att.net writes:
>
> > Re: welding of rebar.
> > There are two types of rebar one is suitable for welding the other is
not.
> > Do not have I think they are called ATSM specifications for each, any
rebar
> > supplier will advise on proper type to weld.
>
> Well, the bottom line is what does it say in your tower base specs? I
> don't think that UST base specs or building department codes allow for
> welding the rebar. Even those huge rebar structures used for building and
> highway bridge footings are tied and not welded.
>
> While the rebar cage isn't typically structural (it's to keep the
> concrete from shrinking and cracking), you still need to observe the LXC
> Prime Directive to "DO what the manufacturer says".
>
> I've built dozens of rebar cages using tie wire and while it might be
a
> little slower, it works just fine. You just have to add some diagonal
pieces
> on the sides to give it some rigidity.
>
> Here's what you want to do. First, get the backhoe in to dig the hole.
> Either have the rebar cage done or at least finished when the hole is
done.
> Have the backhoe pick up the cage and drop it into the hole. Then you can
tie
> the anchor bolt 'fixture' to the rebar cage and if none of the rebar is
> touching the earth and any additional forms are done, then you're
basically
> ready to pour.
>
> Cheers,
> Steve K7LXC
> Tower Tech
>
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