E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
E21D15/14—Telescopic props
E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
E21D15/32—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring
Procede de fabrication d'une filiere d'etirage en carbure de tungstene, destinee a l'etirage des profils en acier, de geometrie curviligne en forme de v
Outil d'emboutissage comprenant un bati inferieur, un poincon et serre-flan portant une chandelle pouvant s'engager dans un alesage du bati inferieur