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Re: Pressure Grouting Existing Pipe Piles

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I sure hope that you don't have a failure caused by your very large grout pressure and I sure hope you are able to turn it off in about a half second when it gets full or you may have a catastrophe. A garden hose at 40psi can raise up a house if the area which the 40 psi is on is large enough.
 
Stan Scholl, P.E.
Laguna Beach, CA
 
On Wed, 22 Jan 2003 09:59:19 -1000 "Mark Geoghegan" <structuraltech.vsl(--nospam--at)verizon.net> writes:
10 psi is a very small pressure for grouting operations. A garden hose will spit out + 40 psi.
 
We would usually have a max 150 psi grouting pressure, and a target pumping pressure of 100 psi, although we may occasionally exceed 150 psi depending on the circumstances.
 
I would use a thixotropic pre-bagged grout and the spec should probably call for bleed testing and maybe a site mock up if the grouting is real critical. Use a gate valve at the bleed/outlet to ensure positive filling of the pile and easy control of air bleed and grout shut off, etc.
 
Also consider a small tremie or grout tube that will be inserted at the mudline grout inlet and reach the bottom of the pile to avoid grout free falling from the mudline - if this distance is of considerable magnitude.
 
Mark Geoghegan
Honolulu, HI
 
 
-----Original Message-----
From: Stanley E Scholl [mailto:sscholl2(--nospam--at)juno.com]
Sent: Tuesday, January 21, 2003 4:51 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Pressure Grouting Existing Pipe Piles

Be very careful that you don't pump the grout too fast and make sure the outlet hole(s) are large enough and lastly don't use more than say 10 psi pressure. I was on a similar project and we almost had a collapse when everything became full of grout.
 
Stan Scholl, P.E.
Laguna Beach, CA
 
On Tue, 21 Jan 2003 11:31:16 -0500 "M. David Finley, P.E." <pec(--nospam--at)isgroup.net> writes:
On a local county bridge repair project, I would like to pressure grout the existing steel pipe piles.  I envision drilling a hole as close to the mudline as possible for grouting and a hole near the top of the pile for air release.  The grout would be pumped from the bottom to the top in order to assure the pile is completely filled.  The piles are 10" diameter and approximately 10 to 12 feet of the pile would be grouted.
 
Can anyone recommend any sources for grout mixtures requirements, installation procedures. specs, etc.?
 
Thanks in advance,
 
M. David Finley, P.E.
2086 SW Main Boulevard - Suite 111
Lake City, FL  32025
386-752-6400