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  • From: Paul Wheaton <paul@richsoil.com>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: [permaculture] hobbit hole
  • Date: Mon, 8 Nov 2004 12:42:37 -0800 (PST)

Oooooooo!

So a 10 foot length of a 10 foot diameter steel culvert would cost about how
much?

I suppose one could do ferro-cement solutions on the ends and use cob on the
inside of
the culvert to hide the culvert ...


--- Jay Woods <woodsjay@cox.net> wrote:

> There is far too much overengineering here. Remember that 10 foot diameter
> corrugated steel pipe (http://www.ncspa.org/ for the trade association and
> http://www.acipco.com/ for an example company) is used to give farmers
> access
> to their fields underneath freeways and to provide drainage for streams.
> The
> key thought here is that arched structures (like hobbit holes) carry far
> more
> load for the cross section than do load bearing flat ceilings.
>
> On Monday 08 November 2004 10:22 am, Scott Pittman wrote:
> > re: Hobbit hole
> >
> > > Back in the early 80's there was a community built underground using
> > > ferrocement, I visited it at that time. It is near Denton, Texas. It
> > > was featured in several magazines but beyond that I can't help, except
> > > to say it can and has been done. I have also seen them built with
> > > remesh attached to the walls by driving rebar into the soil to hold
> > > the remesh and then using gunnite to cover the walls, which is basic
> > > swimming pool technology.
> >
> > The only real concern when building underground is ground water and
> > expansive clays, if you don't have those impinging on the building
> > envelope then it is just a matter of engineering. If you are using thin
> > wall ferrocement for the walls remember that they are not load bearing
> > capable; therefore you will have to support the roof with cement piers
> > or some such, and those piers should be well back from the excavated
> > edge so that they do not exert pressure on the ferrocement walls when
> > they are loaded, probable five or six feet depending on soil type and
> > compaction.
> >
> > Scott P.
> >
> > >on 11/7/04 9:00 AM, permaculture-request@lists.ibiblio.org at
> > >
> > >permaculture-request@lists.ibiblio.org wrote:
> > >>Message: 3
> > >>Date: Sat, 6 Nov 2004 18:18:01 -0800 (PST)
> > >>From: Paul Wheaton <paul@richsoil.com>
> > >>Subject: Re: [permaculture] Source for Hobbit hole construct...
> > >>To: permaculture <permaculture@lists.ibiblio.org>
> > >>Message-ID: <20041107021801.39779.qmail@web13811.mail.yahoo.com>
> > >>Content-Type: text/plain; charset=us-ascii
> > >>
> > >>I thought of that, but thought it would get plenty expensive. But your
> > >> site makes a case
> > >>for something pretty thin. Hmmmmm ....
> > >>
> > >>So how thin could I get away with? And, would I need to create some
> > >>sort
> > >> of ridge to
> > >>support the weight of the earth above it?
> > >
> > > ------------------------------------------------------------------------
> >
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