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Re: Vessel or Stack Foundation - Shallow Bedrock

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I designed a free-standing bill-board sign for a location near the mouth of the Niagara river at Lake Erie- high winds with no terrain protection. Sign dims = 40'L x 12'W w top at 40'. Depth of soil was 2' to bedrock which was weathered. Due to property lines the footing could only be 12'x12'. I specified 6' of rock removal and added 6 rock anchors to provide additional resistance to overturning.

On 2013/08/28 2:50 PM, 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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