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Re: Inspection of pile foundations supporting harbor bulkheads

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I recently read of some inspections made on house piles at the beaches in
North Carolina. The depth of penetration of the piles was determined using
accelerometers and analysis of shock wave propagation (response to hammer
applied to the pile). Basically, the response of the pile to the shock was
a function of its length. Once the length was determined, the depth was
calculated from the exposed height of the pile.According to the report, a
FEMA production as I recall, the depth was determined pretty accurately.

Determining depth of embedment is not quite the same as determining if pile
is sound. However, there should be ways of analysing for soundness using
response in the piles.

Good luck.


At 06:44 PM 9/14/97 UT, you wrote:
>Does anyone have any experience with the inspection of timber piles used
in a 
>foundation to support harbor bulkheads.  I have a need to perform such an 
>inspection to determine if the pilings are still structurally sound.  The
>method which I know of is brute force.  This would involve shoring and
>up the foundation to perform a visual.  Sounds very expensive.  So if anyone 
>has any words of advice or recommendations of firms whom deal with this
>please let me know.