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RE: Caisson cold joint

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You are thinking of a cofferdam.


From: Conrad Harrison [mailto:sch.tectonic(--nospam--at)]
Sent: Thu 12/7/2006 7:33 PM
To: seaint(--nospam--at)
Subject: RE: Caisson cold joint

Maybe a silly question but what is this caisson? I always thought a caisson was a dam like structure used to keep water out, whilst a hole was sunk in a river bed, for the construction of the foundations of bridges and the like. So are these light poles in the middle of a water feature: river, pond, lake?




Steven CONRAD Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust

mailto:sch.tectonic(--nospam--at) <mailto:sch.tectonic(--nospam--at)> 

Roy Harrison & Associates

Consulting Engineers (Structural)

PO Box 104

Para Hills

SA 5096

South Australia

tel: 8395 2177

fax: 8395 8477



From: Mark Pemberton [mailto:markpemberton(--nospam--at)] 
Sent: Friday, 8 December 2006 10:48
To: seaint(--nospam--at)
Subject: Re: Caisson cold joint


I'd be OK with a joint as long as the rebar cage has been designed to take the bending and fully develope the bars on either side of the joint.

Jim Wilson <wilsonengineers(--nospam--at)> wrote: 

100ft tall light poles are being erected on 4ft diameter caisson's at a local university.  The contractor has asked if he can place a cold joint down about 4ft below the top of the caisson.  This will facilitate installation of the anchor bolts and templates as well as electrical conduits.


Is this generally acceptable and is it common?  The Engineer for the pole manufacturer designed the foundation, but they have not been asked about the cold joint.  Maybe that answer needs to come from the owner's engineer, but they are electical and not qualified to answer the question.  So they in turn asked me but I know very little about caissons and told them I would at least ask the appropriate people.


Thanks in advance for any advice on this.


Jim Wilson, PE

Stroudsburg, PA


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Mark Pemberton, S.E.

Pemberton Engineering 
502 Mace Blvd., Suite 2B 
Davis, CA 95616 

Ph:  (530) 792-0511 
Fax: (530) 792-7109

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