Improvements introduced in the construction of announced or arched galleries (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the construction of galleries in annular or arc shape with grooved profiles and especially with a grooved profile with a bell-shaped cross section characterized because the rings or arcs are assembled of equal short segments in their lengths and radii that they telescopically fit together and at least two in two overlap so that only small buckling lengths occur between the various braced joints arranged at the ends of the segments. (Machine-translation by Google Translate, not legally binding)