Cellular arch technology : a great cavity building procedure for loose soils.
I was the technical director of the factory manufacturing the RC pipes. Some literature in english. The italian and french literature has been added because rich of photos, drwgs, sketches, diagrams, etc. Ready for translation, if needed
PS : I don’t know if it is the correct site section. You can shift if necessary
https://mega.nz/#!pUkzDKoa!xVKZEUjbeXwXuKnY-6OR8nWgJI6twCgPSPaaXiZ6Fuk
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Thanks…
Dik