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RE: Earth friction on sonotubes

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Most of our work is done in existing process plants, usually second- or 
third-generation ownership where the plant's been in existence for many 
years, even decades.

The usual practice is to "hydro-vac" the first 5 to 10 feet of soil at any 
location where we're putting in a deep foundation, to make sure they don't 
hit some pipeline or other underground obstruction.

In that case, it is quite common to use sonotube as a form for the depth 
that has been Hydro-Vac'd, since all you have is a bunch of "mush" there 
anyway (they put the dirt back in before drilling the foundation 
but...well, you know).

In this case the sonotube works quite well as a form to bring the 
foundation up to above grade, but in no case do we ever consider that 
portion of the foundation effective for lateral, uplift or down-drag.

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Chuck Utzman Sent: Monday, February 24, 2014 11:47 AM
To: seaint-seaosc(--nospam--at)
Subject: Re: [SEAINT-SEAOSC] Earth friction on sonotubes

No, it won't rot but why use it? The only time I use it is to prevent 
drilled piers from collapsing or to prevent mushrooming at the top. Chuck 

On 2/24/2014 9:40 AM, nma wrote:
> Doesn't the Sonotube usually rot out?  I've seen something like this
> also but in metal sheds made out of bent tubing and corrugated sheet
> metal. The prospective client came to me because his engineer couldn't
> get this design passed by the local jurisdiction.
> Neil Moore, PE, SE
> neil moore and associates
> consulting structural engineers
> shingle springs, california
> 530 677-4308
> On 2/24/2014 8:49 AM, Drew Morris wrote:
>> I am reviewing the design of a foundation for a small barn for
>> horses, 30' x 36'.  The designer is using sonotubes of various

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