We've moved along rather smoothly through the various phases so far: soil testing, block production, footings/foundations, structural wall construction, and tile vault prototype construction. When it came to building the vault at full scale, it did not go as smoothly.
July 17: we began construction of the vault using the stabilized compressed earth tiles we fabricated with the sub-soil from the site. We focused on building arches over the rebar formwork.
by the end of the first day, we completed arches
across the length of the vault
July 18th: we worked on extruding the arches off of the rebar.
by the end of the second day each arch was now two tiles wide
and a first course of second-layer tiles was laid
along the base of the vault
July 19th: we worked on closing the second layer of the arches over the rebars and continued to extend the middle arch.
by late afternoon we had a major collapse right where we had
been extending the vault and building the second layer.
Since it was Friday afternoon, we cleaned up the wreckage and ended the work week. Over the weekend we continued to see signs of the structure getting weaker and by he following Monday much more of the structure collapsed leaving just the 2-layer arches supported by the rebar formwork. Upon close inspection we realized that due to lack of curing and many other factors, even these arches were very weak and had to be taken down.
A shallower catenary arch is more stable to lateral deformation, due tu its greayer thrust outwards. Certainly better abbutments must be given. But less height of arch is less difficulty in auxiliary floor levels. Catalan vaulting ir timbrel vaulting is a laminar compessive membrane,nmás its stability dependes on this membrane having a sheathing quality or action. In your design shown above, arches were attempted free standing and far too high and without the lateral restraint given by a continuos membrane. I would recommend studying videos of Ramón Guarda I Parera on youtube.
ReplyDeleteA more stable, perhaps trussed rebar arch formas should be used, places on wedges for ease of these being lowered. The technique of applying plaster of París on tiles is crucial, only small amlunts must be mixed, with just the right amount of water, otherwise the connection between tiles does not hold.
ReplyDeleteA book I recommend:Construcción de bóvedas tabicadas by Ángel Truñó.
ReplyDeleteIs there an ebook available?
DeleteA shallower catenary arch is more stable to lateral deformation, due tu its greayer thrust outwards. Certainly better abbutments must be given. But less height of arch is less difficulty in auxiliary floor levels. Catalan vaulting ir timbrel vaulting is a laminar compessive membrane,nmás its stability dependes on this membrane having a sheathing quality or action. In your design shown above, arches were attempted free standing and far too high and without the lateral restraint given by a continuos membrane. I would recommend studying videos of Ramón Guarda I Parera on youtube.
ReplyDelete