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Re: Auger Cast Piles

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I believe augercast piling are generally 8 to 14" in diameter. They are
drilled with a continuous hollow stem auger and grout is injected thru
the stem under pressure as the auger is withdrawn. They are typically
used as friction piles and are installed in groups with a pile cap to
distribute load. The hole cannot be inspected during installation, like
a caisson.

Drilled piers or caissons are generally 12" to 48" in diameter, but I
have heard of some up to 11'-0" in diameter (John Hancock Building
Chicago). They can be straight shaft or belled at the bottom with a
special tool. They are typically end bearing and are normally installed
as a single load bearing element. The hole is drilled sometimes with a
steel casing to prevent caving. An inspector can be lowered in the hole
(30" or larger) to inpect the bearing condition before the concrete is
poured. The casing is usually recovered after the concrete is poured (if
they are lucky).

I hope this helps.

Jim Kestner, P.E.
Green Bay, Wi.



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