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Free-standing column of stones with permeable sides as a thermal mass - Page 2

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Posted by Gary on May 11, 2005, 2:49 pm
David Delaney wrote:

Just as a thought, if you haven't already, you might check on design
procedures for gabions -- there seems to be quite a bit of stuff out
there -- eg:

They mention a: Lane's Gabion and Mattress Construction Guide



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Posted by David Delaney on May 11, 2005, 4:06 pm

Interesting stuff, especially the comparison between welded mesh and
woven mesh. It seems that I should be considering woven mesh.

David Delaney, Ottawa

Posted by David Delaney on May 11, 2005, 4:26 pm
 On Wed, 11 May 2005 12:06:17 -0400, David Delaney

Or maybe not. It may be that the rigidty of the welded mesh is just
what this application requires.  This is not like a gabion that must
conform to the hole it's put in, but a defined shape we want to
maintain. Also, I  am relying on the transmission of horizontal force
between vertical and horizontal wires. It may be that welded mesh is
better for that, although I don't discount the power of friction.

David Delaney, Ottawa

Posted by David Delaney on May 11, 2005, 9:44 pm
 On Wed, 11 May 2005 12:26:16 -0400, David Delaney

Re: http://geocities.com/davidmdelaney/permeable-tm/permeable-tm.html

[On welded mesh or woven mesh as the retaining skin for a free
standing column of stones]

Hmmm....  Woven might be better. The outer compressive skin might be
more reliable if the vertical wires could move slightly wrt the
horizontal wires, minimizing stress concentrations in the critical
horizontal wires.  It is only in the pigtail projecting into the mass
of stones that we want transmission of horizontal force between
horizontal and vertical wires.   Make the pigtail longer? Provide an
anchor in the stones for the free end of the pigtail? 2' enough? 4'?

The idea "pigtail" is probably wrong -- the desired frictional forces
would probably be greater if the two flaps of the pigtail were
separated and embedded separately in the stones, especially if each of
them kept the curl derived from the roll in which it was shipped.

David Delaney, Ottawa

Posted by David Delaney on May 12, 2005, 1:12 pm
 On Wed, 11 May 2005 17:44:01 -0400, David Delaney

Re: http://geocities.com/davidmdelaney/permeable-tm/permeable-tm.html

Now re-titled

"Free-standing column of stones for a heat store without fans"

Currently there is no committment recorded re welded vs woven.

A pigtail (flap of mesh) projecting into the mass of stones might
create a slip plane -- a crack -- in the otherwise interlocked mass of

The pigtail is now gone.

David Delaney, Ottawa

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