[TheForge] OT Urethane foam. was inflatable castle

Fri Mar 19 13:16:00 2004

Okay, 
So what if you put a smaller (say, 8' dia) balloon  inside another
(say, 9' dia).  Inflate the inner balloon with air.  Inflate the outer
with urethane foam...

Bruce
NJ

>>> [email protected] 3/19/2004 12:55:37 PM >>>

----- Original Message -----
From: "Andy Vida" <[email protected]>

Subject: Re: [TheForge] OT Urethane foam. was inflatable castle

>
>
> Bruce Freeman wrote:
>
> > Shake the bottle, hit the trigger and out comes warm liquid
>
> We'll just have to let that one pass, untouched.
>
> Best inflatable building I saw was at some alternative
> housing thingy at OSU last year.  Somewhere in southern
> Asia they set a ver large bladder on the ground, arranged
> a large body of rebar netting on it, covered with about 6
> inches of concrete and blew the sucker up.
>
> Instant conflatable concrete dome building.  It was very cool.
>

They've been doing that for at least 40 years in this country. Build a
rebar
structure, place the right shape balloon inside and shoot it with
gunite.
(spray concrete)

In the late 60's there was a TV show called "The 21st. Century"
sponsored by
Dow (I think). One segment showed the start to finish construction of a
4-6
man survival structure. They loosely inflated a balloon, taped a
cardboard
door and window frame to it, with hinges and taped a metal stove pipe
jack
to the top. Then they sprayed about 4" of urethane foam on it, waited
about
30 minutes, opened the door, deflated and removed the balloon.

The door and window were just borders and were sprayed full, the
double
cardboard "frames" simply formed the shapes so they didn't have to cut
the
openings with a saw and damage the balloon. There was enough urethane
left
to make a 2-3" floor after the balloon was removed.

The whole thing fit in a mid sized steamer trunk, maybe 2/3 the size of
a
foot locker. There were hinges, latches and clear plastic for the
window,
stove pipe and other various hardware in the kit. Lastly (maybe) the
case
doubled as a multi-fuel stove.

It was a really slick. Unfortunately it won't work because you can't
spray
urethane in wind, rain or too low a temperature.

Frosty
------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

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