Fwd: Re: [TowerTalk] anchoring concrete base to rock

[Dave N6NZ]

meant to copy the reflector on this.  -n6nz

>Date: Sat, 02 Jun 2001 23:51:57 -0700
>To: "LA7SL" <la7sl@online.no>
>From: Dave N6NZ <n6nz@n6nz.net>
>Subject: Re: [TowerTalk] anchoring concrete base to rock
>
>I have similar "soil" (if you can call it that) at my new QTH.   I have 24 
>to 36 inches
>of cover over granite. My comments below are based on my research into the 
>issue,
>not on actual experience (I haven't poured concrete yet).
>
>Rebar should be covered by concrete.  Exposure to moisture will cause it to
>rust and deteriorate.  You should assume moisture will seep along the
>concrete/rock boundary.
>
>The rock should be bored and the tieing elements cemented into the rock using
>"rock bolt cement" which is made for this purpose.  Then pour over the rock
>bolts and the rock bolts should not touch the rebar.
>
>In the end, in my location, I decided to blast in order to get deep enough 
>holes.
>There is a $750 minimum for blasting, but for that $750, you can fracture 
>a lot of
>granite well enough that an excavator can pull it out.  This, I learned, 
>while setting
>a septic tank.
>
>73, Dave N6NZ
>
>At 08:46 PM 5/27/01 +0200, you wrote:
>>Hi everybody !
>>I just subscribed to the list. Maybe this subject has been discussed 
>>before, but
>>looking through all the archives would ruin me as I am on dial-up !
>>
>>The problem :
>>
>>A self supported crank-up / tilt over is to be mounted in a location with 
>>only
>>4 feet of  loose soil covering solid rock. I have to use a concrete 
>>base,- but
>>have no chance to get it deep enough. I have to anchor the base to the rock
>>below. I have instructions on how to build the rebar "cage". The instruction
>>spesifically warns against letting the rebars get in touch with 
>>underlying soil.
>>Is this also valid for underlying rock ??
>>Do I have to use anchor bolts (terribly expensive here) and NOT let them 
>>touch
>>the rebar ?  It would be very practical to drill holes and extend the 
>>vertical rebars
>>down into the holes. How do I fix them there if this method is allowable??
>>Any compounds that are good for this and not cost a fortune ??
>>   I have both corrosion and lightning safety (base explosion) in mind 
>> when asking.
>>     Thanks in advance !
>>And VY 73 DE
>>LA7SL- Nils "Peter" Pedersen
>>la7sl@online.no
>>
>>
>>
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