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Re: Vessel or Stack Foundation - Shallow Bedrock

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Yeah, never used rock anchors though familiar with the concept.

William L. Polhemus, Jr. P.E.


On Aug 28, 2013, at 2:16 PM, "nma" <nma(--nospam--at)> wrote:

> It depends upon how high the mast is and what it weights.  You will 
> probably have to go to bed rock anyway and you can easily figures what a 
> "spread" block footing will have to be.  If you have a real estate 
> problem, then rock anchors might be the answer, but they do cost more 
> money and extra concrete weight might be cheaper. Neil Moore, PE, SE On 
> 8/28/2013 12:01 PM, Drew Morris wrote: 
>> Can you add rock anchors into the bedrock to tie the concrete foundation 
>> down? On 8/28/2013 10:50 AM, Polhemus, William wrote:
>>> Has anyone here got experience with a foundation for a tall vessel or 
>>> stack e.g (standalone, not guyed) in a condition where there is fairly 
>>> shallow bedrock? I'm looking at the possibility of such a thing. 
>>> Typically I use deep pier or pile foundation, but In this case there is 
>>> assumed to be bedrock at 8 to 10 feet depth below ground. I assume I 
>>> could then use a "chunk" foundation bearing directly on the rock in 
>>> such a case, recognizing I might need a spread there to deal with the 
>>> overturning. In that case what do I need the geotechnical to tell me? 
>>> William L. Polhemus, Jr. P.E.

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