[TowerTalk] RE: Tower bolts

[Bruce Osterberg]

Gentlemen and Ladies:

I just received my bolts today from US tower for a HDX-572 that I will 
install.  They look like regular bolts that are 27 inches long and threaded 
at both ends.  The bottom end has a welded Heavy duty nut on it, (more 
threads per inch), and the top 6 inches that stick out of the concrete come 
with three each heavy duty Galvanized nuts.  Why three I dont know as the 
base itself did not arrive just the anchor bolts.  The package said 2 of 2 
so I suppect it will come tomorrow.

What is interesting is that the Nuts are the heavy duty kind, and 
galvanized,  wereas the anchor rods are not galvanized.  The only reason I 
can think of this is that the rods will be in concrete with 6 inches 
exposed.  and the exposed area under the nuts will be grouted in and the top 
will have the galvanized bolts.  I will still cold Galvanize spray the bolt 
ends after cleaning them.

Sure hope the base shows up tomorrow!!  Winters a coming!



N9BX 73 Bruce




>From: "Al Williams" <alwilliams at olywa.net>
>To: "Bill Turini" <wtu at cypress.com>, <towertalk at contesting.com>
>Subject: Re: [TowerTalk] RE: Tower bolts
>Date: Thu, 30 Sep 2004 12:18:11 -0700
>
>I don't know if the UST supplied bolts for the HDX572 are identical or
>similar to those used for the TX-472 but if they are;
>they are not ordinary straight bolts but rather are in the shape of a J.
>The bottom of the J is only 27" overall with only 22" embedded
>in the concrete.  The foundation stress analysis claims a Pullout
>Capacity = 258,490 pounds and states it is OK.  I can't determine
>anything in the tower stress analysis that shows what the pullout stress
>is.  Perhaps someone can explain what benefit is obtained by having the
>bolts bent into a J  in the concrete.
>
>Also, is the UST supplied stress analysis valid if the J bolts are
>replaced with straight bolts?  What effect would that have on a building
>permit and an insurance claim if the tower failed?
>
>k7puc
>
>----- Original Message -----
>From: "Bill Turini" <wtu at cypress.com>
>To: <towertalk at contesting.com>
>Sent: Thursday, September 30, 2004 10:53 AM
>Subject: [TowerTalk] RE: Tower bolts
>
>
> > I have a TX-472 tower that I bought used. I called a local bolt firm
> > that caters to the local maritime and construction trade, told them
>the
> > bolt specs and they said "no problem".  The first time they charges me
> > $16 for three bolts (and nuts, washers, and lockwashers). The second
> > time (8 years later) the price went up to $34 or so, but I had the
>bolts
> > made 4' long, with 6" of thread.
> >
> > They also supplied ASTM-A36 bolts and nuts for mounting the tower to
>the
> > base fixture. Any place that deals with construction that puts up road
> > signs should be able to help.
> >
> > Bill  KA4GAV
> >
>
>_______________________________________________
>
>See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
>Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any 
>questions and ask for Sherman, W2FLA.
>
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