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RE: Downdrag on cast in place drilled piers (caissons)

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Typically I believe that steel sleeves are used to help maintain the shape of the drilled shaft through any loose soils until the concrete is cast, the sleeves are typically then removed. I have never seen sleeves left in place to prevent any down drag.


D. Matthew Stuart, P.E., S.E., P.Eng.

Senior Project Manager

Schoor DePalma Engineers and Consultants

Manalapan Structural Department

200 State Highway Nine

Manalapan, NJ 07726

732-577-9000 (Ext. 1275)

908-309-8657 (Cell)

732 -431-9428 (Fax)



-----Original Message-----
From: Mark Baker [mailto:shake4bake(--nospam--at)]
Sent: Monday, September 22, 2003 2:13 PM
To: seaint(--nospam--at)
Subject: Downdrag on cast in place drilled piers (caissons)


Has anyone had any experience with the installation of a sleeve throughout the fill depth in contact with a caisson to eliminate the effect of downdrag on the caisson shaft.


I am entertaining the idea of a 24" dia. pvc pipe sleeve, have for now ruled out the use of sonotube.




Mark D. Baker