Re: Pier design and sand

Joe Zeglinski


The other benefit, I was considering, is that it can be sawn to length,
with some work. However, you can do a deal with a contractor doing road work,
and he will cut one evenly, to your requirements, using his machinery - you
might even get the pipe cheaper than from the dealer (who might not want to
sell you just one). I think they are standard 10 foot long, too much to bury.
You can also decide if you want the bell-swaged wider end up, for an inlaid
(wooden ?) plug/mounting-plate/pier vibration reducer - or swaged end down, to
have a slightly wider footing 4 feet down.


----- Original Message -----
From: "Murray Hammick" <mphammick@...>
To: <ap-gto@...>
Sent: Wednesday, October 31, 2007 5:29 PM
Subject: Re: [ap-gto] Re: Pier design and sand

The bending can be captured using strain guages (gages for US speakers)

Would anyone be prepared to give all of this a go ?

I liked the idea of the 10" concrete drain pipe - I cannot see that bending
very much. Its a quicker and possibly cheaper alternative to constructing a
reinforced concrete pillar.


"N. Foldager" <nf@...> wrote: > If
the Petrie dish has value, then it is far simpler to attach a mic to
the side of a pier, and plug the mic output into your laptop audio port.
I question the "Petri method" as I don't think it for sure can
discriminate between the bell like oscillations (which we don't care
about) and the bending oscillations. (Or can it? The frequency of
latter should be much lower.) I believe that a microphone attached to
the pier will only record the "sound of the bell", not the bending of
the pier.

Best regards,

Niels Foldager

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