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RE: Concrete-filled steel piles

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In Alaska they normally  use a passive cooling system, that cools the soil in
the winter, with hollow piles and filled with a refrigerant that evaporates
below grade and migrates to the top of the pile where it condenses.

-----Original Message-----
From: Kevin Below [mailto:kbofoz(--nospam--at)] 
Sent: Friday, April 18, 2008 2:54 PM
To: seaint(--nospam--at)
Subject: Concrete-filled steel piles

For a project on very soft soil, subject to liquefaction, we will be going
with friction pile foundations, which will also serve the geothermal tubes.
Piles will be 8" dia. steel tubes.
What are the structural advantages of filling them with concrete ?  The
geothermal people need to fill the tube with something that is a good
conductor, such as their geo-grout (I don't know what that is exactly, just
that it remains liquid) or concrete, or even water.

Thanks in advance for comments, opinions, diatribe, irony, satire or

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