[TowerTalk] Need help locating Rohn BXB 7-8

[Mel Farrer]

According to the Rohn Drawing number B870725 for 25, 45, 55, 65 towers, They
depend on the galvanizing of the legs to protect the bottoms and inside of
the leg that is in the gravel, and at the depth the base is, 4 feet, your
are out of the normal environment freeze zone. Water that accumulates will
eventually drain out. The rebar is not galvanized and so they need to have
them inside the envelope of the concrete mass.   

-----Original Message-----
From: alsopb [mailto:alsopb@gloryroad.net]
Sent: Friday, June 29, 2001 7:46 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Need help locating Rohn BXB 7-8


This practice recommended by Rohn has me a bit puzzled.  Rebar in the
concrete has to stop 3" from the end of the concrete on all sides. 
The reason given is that they will rust, disintegrate and form a
cavity which weakens the base.  

I guess Rohn believes their towers legs never rust-- inside or
outside.

Is that true?  I agree with wanting to keep water out of the legs.

Also, if the water table rises above the base of the bed of rocks,
doesn't it guarantee water being in the tower legs?

73 de Brian/K3KO

Bill Coleman wrote:
> 
> On 6/20/01 10:40 AM, Ward Silver at hwardsil@WOLFENET.com wrote:
> 
> >
> >The only problem I've had was that water got into the pipes (my fault)
and
> >had to be siphoned out.  Put a cap on the pipes or fill them with cement
> >(after you put the bolts in).
> 
> Wouldn't it be better practice to place the pipes so they go through the
> concrete base and into 4-6" of gravel for drainage?
> 
> This is the typical practice for Rohn 25/45-type bases using either a
> base section or embedding a full-length section.
> 
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@arrl.net
> Quote: "Not within a thousand years will man ever fly!"
>             -- Wilbur Wright, 1901
> 
> List Sponsor: Are you thinking about installing a tower this summer? Call
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List Sponsor: Are you thinking about installing a tower this summer? Call us
for information on our fabulous Trylon Titan self-supporting towers - up to
96-feet for less than $2000! at 888-833-3104 <A
HREF="http://www.ChampionRadio.com">
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List Sponsor: Are you thinking about installing a tower this summer? Call us
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