I haven't done or thought about it either, but building upon your thoughts, I'm thinking a bell-shaped or conical form (wide at the base, which makes for an interesting excavation challenge) might offer more stability in the sand as well, suggesting that the "forms" are in the shape of a teepee. This presumes that the base of the concrete anchor, however deep it is, is above the high water tide line. Otherwise, you're looking at hydraulic concrete?
_____________________________________
Dan Becker, Division Manager
Long Range Planning Division
Raleigh Department of City Planning
One Exchange Plaza, Ste 300 (27601)
PO Box 590, Raleigh NC, 27602
919/516-2632 (v); 919/516-2682 (f)
http://www.raleighnc.gov
________________________________________
From: Dave Follett [[log in to unmask]]
Sent: Monday, August 08, 2011 5:01 PM


I have never done or thought about doing something like this, but why
don't you dig a pit with some boards on hand and place the boards
continually at the walls of your sand pit, basically use them as
shoring, when you get to the depth you want stop and fill the shoring
with concrete using it as form work to create a concrete anchor.  Then
you could drill out holes for the winch, and install some threaded
steel robs into the concrete with epoxy.  Then you can get some nuts
and bolts and affix your winch.

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