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Re: [PSUBS-MAILIST] Concrete submarines
Hello EM
I worked a few weeks many years ago in a construction
deposit an there they rented forms for concrete. The
forms were made of plywood and the surface that had
contact to the concrete was covered with grease. I
also saw forms for tubes and these were also of wood.
So my idea is to make the forms of wood. I am not
sure how to fix the steel wire in the middle but I
believe this can not be so difficult. The problem is
moving the parts and to finish the assembling.
That is my idea and I hope it will work.
Best wishes
Jürgen
--- EM <emuller@naic.edu> wrote:
> So how do you make the forms?
> EM.
>
>
> On Thu, 16 Jun 2005, Michael Edwards wrote:
>
> > 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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