Earthbag Cellar Level 10, 11, 12 and 13 … soon arches

We had one weekend of construction at the beginning of June with the help of Adi and Dan … we got 10 and half of 11 done.

We then paused because of my allergy-period and because we were busy finishing and launching the new Cutia Taranului website. In recent weeks we got back in the saddle, we finished 11 and 12 … and its feeling more and more like a place.

We’ve also put in velcros to which we plan to attach a grain storage and dispenser (planned to hold ~100kg of grains):

Sia, a new puppy who has been with us for a few weeks is getting acquainted with the site … and also has manifested a destructive quality … it seems she enjoyes tearing into earthbags and digging soil out 🙁

Today we started 13 which brought us to the levels of the rectangular door frames …. which means that soon we begin to form the arches on top of the doors.

And finally we have out overall progress indicator. This pile of soil is like an hour-glass … if my calculations were correct it should have enough soil to bring us to completion. When we started construction this year the pile reached out to where the mixer is currently standing so we’ve taken quite a bite out of it. It is nice to feel the space starting to open up and reconnect with the world beyond it.

I estimate we are going to end up with 19 or 20 levels.

And lastly some number I’ve collected:

  • We are currently mixing batches with a ration of 4 shovels of sand + 12 shovels of clay soil. This fills an 80 liter wheelbarrow.
  • A wheelbarrow is roughly the amount of soil that goes into a sack (1 meter long when flat, 80cm when filled to the max) … though we are using mostly tubes (not sacks).
  • Each batch includes 2 wheelbarrows.
  • Each wheelbarrow contains ~25 cans (3 liters in a can) … so it takes ~25 tosses to “move” a wheelbarrow of soil up the wall.
  • Each batch (of 2 wheelbarrows) translates into ~1.5 linear meters of wall (we are using 50cm wide – when flat – tubes and bags).
  • Which means that each can holds about 3 linear centimeters of wall.
  • At the current rate Iulia and I (neither of us particularly strong) are doing ~2 linear meters of wall an hour (though we will slow down as we move higher up the wall).
  • At this rate we can do a level in 3 or 4 days (we work at most 6 hours a day in two sessions … morning and evening).

 

 

Creating Swales & Berms Using Plows

We don’t have access to a variety of digging machines here (only to a stadard tractor with a front loader + diggins spoon) so these pictures caught my attention – digging swales and berms using a tractor with a combination of plows:

… and water it holds:

Three terms I found mentioned in the forum thread where I found this

  1. The moldboard plow sounds like something that is typically used by farmers in our area to break-up soil.
  2. I have not been able to find much formal informatn about a “drag blade plow” but as I understand it is used to move the soil after it is broken up by the moldboard plow.

So it is about repeting numerous cycles of loosening and shifting … how many cycles depends on the depth and width of the swale and the number of blades on the plow.

 

 

Provision Transylvania: Lars and Robin

Lars and Robin are a beautiful couple I’ve had the pleasure of meeting a few times who live in Alunisu (on the other side of Cluj). In this interview Lars does what he does so well … gently and compassionately painting a comprehensive picture of where we are and where we can choose to go from here.

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“Imagine if the financial sector would expand the definition of returns … and beside the financial return would also look at return of happiness and well-being of man and nature, then you can make money and capital into an instrument that serves the society.”

Earthbag Cellar Level 8 and 9 and Backfilling

We’ve completed levels 8 and 9 …

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… on level 9 we were joined by Itsik and Yifat who visited with us for a week … so we reached and celebrated the end of 9 together.

 

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In level 9 we also put in additional vertical reinforcement by pounding in rebars into the longest stretch of buried wall that we have (~6 meters)  … and we will continue to do that in an interlaced pattern to give the wall some more strength to resist the weight of the earth piling up behind it.

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Which brings us to today … soil … we called the excavator back (marking what is probably the half-way point of wall construction) … to start backfilling and bringing some more soil to our mixing station (so that I don’t need to carry it in a wheelbarrow). Yesterday we prepared by pulling the plastic covering over the walls   20161010_095944

.. and so it started … and very quickly the corner behind the first retaining wall was filled up ….

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… then the side and rear corner20161010_110123

… during the backfilling, a new soil pile near the mixing station started to appear

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… and before you know it (almost three hours later) the backfilling was complete …. so from the outside we are back at ground level (which does make some maneuvering on the walls easier)

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… and a huge pile of soil (30+ cubic meters) is now blocking the entrance and hiding the site … when that soil is gone, construction of the walls should be complete (or very close to completion)

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As the work progressed we realized we were going through A LOT (= surprising amount) of soil … we’ve used up most of the free soil on and around the site … and it doesn’t look like what we have left will be enogh to complete backfilling and covering the structure. At first this felt like a potential problem … but it quickly transformed into opportunity. It looks like the supply of soil needed to complete this project will overlap and lead into the next project. One option weve been discussing is a small lake (a whole other story). Another option is to start excavating what may be the next construction project … either way … it left us with a pleasant sense of continuity 🙂

Earthbag Technical Report from Nepal

Good Earth Nepal has published this PDF on its site.

Before presenting some highlights I would add that there are a few details which, to my understanding are only correct in the context of typical above ground houses, less so with bermed or underground structures.

“At present, there are over 15,000 Earthbag buildings worldwide with recent Earthbag  constructions gaining approval under strict US building codes.

An estimated 55 Earthbag structures built in Nepal survived the 2015 earthquake, in regions ranging from Solokumbu to Sindhupalchok to Kathmandu.

… The main material of an Earthbag structure is ordinary soil obtainable at the worksite.

… A study by the U.S. Federal Highway Administration found that the half -life of polypropylene fabrics in benign environments can be 500 years or more. The
bags themselves have a tensile strength even higher than that of steel, and can resist circumferential forces generated from the weight above.

… An Earthbag building uses its own weight to anchor itself to the rubble trench foundation. Since the superstructure is not attached to the foundation by bolts or rebars, the foundation and the
superstructure are able to move independently minimizing the shock transfer to the walls. A rubble trench is also built of individual units rather than a continuous beam further absorbing the shock.

Earthbags are resilient. As per an experimental study on vibration reduction … Earthbags have a relatively high damping ratio with horizontal as well as well as vertical vibrations effectively reduced.

… All of these components make Earthbag structures extremely earthquake-resistant. Tests done in accordance with IBC standards have found that Earthbag construction far exceeds Zone 4 standards, devised to protect against the very highest level of seismic activity. Numerous Earthbag structures have been built in the United States. Earthbag structures are permitted by the California Building Code, the toughest in the United States due to high seismic activity.”

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