sol_design at yahoo.com
Tue Jun 2 12:53:52 CDT 2015
This sounds like a fun project.
Some different techniques we have used....
2500kg trucking straps pulling the wall down. They are ratchet straps and get removed after the wall has been suitably compressed, leaving less substantial straps in place.
For our, 'infill' walls we use hydraulic jacks under the top plate to push the wall down prior to the last bale being placed into the wall. We generally use a 2000kg jack above each bale. This technique gets a good tight wall but is a difficult technique if you do not have a top plate that is strong enough or no top plate at all.
Not very accurate but worked well.... using a tractor with a bucket to push the wall down and winching vehicles off the ground.... These techniques were used when a living roof was being installed and the 900kg plastic straps were breaking during compression. Once the wall is compressed the 900kg straps work fine.
We look forward to hearing more!
Sven and Sarah Johnston
Sol Design, Ltd.
50A Connolly Street
Geraldine 7930 New Zealand
03 693 7369
sol_design at yahoo.com
On Wed, 3/6/15, André de Bouter <contact at lamaisonenpaille.com> wrote:
Subject: [GSBN] Compression
To: "Global Straw Building Network" <gsbn at sustainablesources.com>
Received: Wednesday, 3 June, 2015, 1:36 AM
Hello Balers and Balesters,
The French SB Network is invited to participate in a
on loadbearing SB. We'd like to show that compressed
walls can carry a decent load. Of course we know that
this has been
proven before, but hey, this is France, we have to prove
same laws of physics and logic apply here as well, so
French can accept it is true (you never know, eh? ;-).
The basic idea is that if we can show that such a wall
précompressed at, say, twice(?) the load it will carry
future, it should be a safe bet that it will hold the
I cannot yet explaine the details of what and how we
want to test as
they are not yet defined. We'd like to test
unplasterd small, middle
sized and big bale walls in order to mesure the ratio of
height relative to dry density of the bales and the
a few plastered walls might be tested too.
I'm looking for is a cheap, secure and rapid way to
compress the SB
walls 'a whole lot', that can, preferably, be
reproduced on building
sites. And if possible in a way that one can predifine
I found this pneumatic strapping device :
but it 'only' goes to 7500N (750kg - 1650 lbs)
I found straps that go 1170 kg - 2574 lbs
Comming acros this device I figured that compressing
walls would finaly become a controled piece of dense
cake. But I
wonder if this machine (for a 'mere' 2000€)
has what it takes to
We could also use mesuring devices under the straps,
but probably finiky.
Have any of you have found the 'perfect',
Any suggestions on how much you would press the walls
and how big a
safety margin engineers, building officials and builders
(our biggest hurdle in France) would consider ok?
Our starting point is to convince that a SB wall can
(1100 lbs) per meter of wall (about 3 feet). Does a
700kg - 1550 lbs 'impress'? or should the margin
be much higher?
André - squeezit - de Bouter
Maison en Paille
Organisme de formation
enregistré sous no. 54 16 00646 16
Rue des Chaumes, Les Pellières, 16120 ST-SIMEUX
05 45 66 27 68
contact at lamaisonenpaille.com
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