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Re: [PSUBS-MAILIST] Concrete submarines forming
Greetings Wilfried:
Good to hear from you!
I understand slip forms in water tanks and walls. It's the changing
shape of the
rings to make such a fair hull that I don't understand. When you
describe the triangle
pieces of the rings, I think of a faceted shape like what you get with
a geodesic
dome as opposed to a perfect sphere.
I would be very grateful for some picture!
Best regards,
Michael
P.S. While I don't see getting a dock slip on this island I have
reconsidered a full time
hull in the water, I will have to keep it on a moorings, (very large
anchor).
So what is the next size boat to build? Is it practical to make a hull
for 500 meters depth?
=================================================================
On Jun 17, 2005, at 5:57 AM, diagroto@ibague.cetcol.net.co wrote:
Hi Michael, Juergen,
This is Wilfried, the forming method is a gliding form as you
would use it in tower construction, i will post a couple of pictures
soon to make it clear.
Greetings
Wilfried
Hi Juergen, Michael
Greetings Juergen & subbers:
Below is a clip of Wilfrieds (the concrete guru) response to the water
tight question.
I am unaware of any other projects in the works, do you know?
I just bought the cement mixer for ferrocement projects on the farm,
but am a long
way from knowing enough for a pressure hull. I had few additional
private post with
Wilfried but still don't understand his mold method without any
pictures.
I think this technology has great promise for submarines. Keep us
posted!
Best regards
Michael Edwards
=========================================================Subject:
[PSUBS-MAILIST] con
Date: Sun, 28 Sep 2003 20:10:55 -0500 (COT)
From: diagroto@ibague.cetcol.net.co
Reply-To: personal_submersibles@psubs.org
To: Personal_Submersibles@psubs.org
Dear D,
Not sure to understand your question completly. In any case this was
MASSIVE
concrete 18cm walls - steel 6mm bars as in normal construction must be
in
middle of wall (at least 2 cm from surface) to avoid rust and take full
tension.(every construction engineer knows it) NO chicken wire involved
!
No construction in LAYERS this is ferrocement (chicken wire) for thinn
hulls
(1-3cm) of yachts. My sub was MASSIVE concrete. Liqid in form and
compacted as
in normal construction.
Of course was it watertight.
You seem to have concerns about concrete in direct contact with
seawater. My
boat had a outer skin of 5mm bitumen (tar) reinforced with glass fiber.
So concrete is not in contact with water under pressure - this is
similar in
dam construction. In deed in dam construction filtration problem is by
far
more severe as you have to connect a dam with rock that is filtering
etc. in
practice all this is managable. Covering a submarine with a waterthight
skin
is quite easy compared to that.
All in all in practice concrete in seawater contact is by far less
problematic
as steel or aluminium in sea water contact.
Can handle it. Problem of CaCo3 process reverse is more in theory than
in
practice. Oil tanks in north sea, drilling platform underwater
struckture all
in concrete are already in use and never presented problems most of
them
without any coating.
Just make following experiment put a concrete, alu, steel probe (holow
shpere)
in saltwater under pressure during a month.
Will see that concrete will alterate by far less than other materials.
Kind Regards
Wilfried
=========================================================On Jun 16,
2005,
at 1:42 AM, Juergen Guerrero Kommritz wrote:
Hello Psubbers
I am searching some information about concrete for
submarine hulls. I know at least one submarine was
build with concreteand there were some other projects
on the work.
I want to know if the it is possible to use "normal"
portland concrete for the hull I dont´t know if this
will be enought (water thigth)and it is impermeable
or if it is better to use an special sealling product
for the outer coating layer.
May be it is better to use a sealling product in all
the concrete mixture?
I only have little experience with concrete (only
portland) building bricks and a small water tank that
was not very impermeable.
I thank you for any information
Best wishes
Jürgen
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