[TowerTalk] Rebar Centering, Rebar Rusting, Foundation Failure, ETC.

[K8RI on TowerTalk]

Still, when using a tower base set in concrete the base goes through the 
concrete into crushed rock or pea gravel underneath for drainage.  I can 
understand the need for the bottom of the tower section sticking out the 
bottom of the concrete for drainage, but I would think it'd still be the 
same as rebar sticking out the bottom.

Also where J-bolts are used they are inserted into the raw pour rather than 
being grouted according to my ROHN catalog.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com (Use return address from home page)


> Also, they don't contact the rebar cage.
>
> They are (or should be) encased in grout.  At least that's what USTs
> installation instructions and the PE's drawings show.
>
> Good luck,
> Gil, W1RG
> ----- Original Message ----- 
> From: "Rick Karlquist" <richard at karlquist.com>
> To: "Allan W Schlaugat" <reflectors at n9isn.com>
> Cc: "Michael Baker" <k7ddmjb at qwest.net>; <towertalk at contesting.com>
> Sent: Thursday, October 12, 2006 8:08 PM
> Subject: Re: [TowerTalk] Rebar Centering, Rebar Rusting, Foundation 
> Failure,
> ETC.
>
>
>> One thing that has always baffled me is:
>>
>> If it is so important that rebar does not come within
>> 3 inches of the concrete to earth interface, then why
>> is it OK for the anchor bolts to stick up out of the
>> concrete?
>>
>> Possible answers:
>>
>> 1.  They penetrate a concrete to air interface.
>> In that case you can simply let a few of the rebar
>> cage vertical bars stick up out of the concrete
>> so you can grab on to them to keep the cage centered.
>>
>> 2.  They are galvanized.  However, UST ships non
>> galvanized anchor bolts, so I guess it isn't 2.
>>
>> 3.  Rebar rusts easier than bolts.  Probably not.
>>
>> Anyone have the correct answer?
>>
>> Rick N6RK
>>
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