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
E21D15/34—Telescopic props with parts held relatively to each other by friction or gripping by axially- moving balls, rollers, or the like
E—FIXED CONSTRUCTIONS
E04—BUILDING
E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
E04G25/00—Shores or struts; Chocks
E04G25/04—Shores or struts; Chocks telescopic
E04G25/08—Shores or struts; Chocks telescopic with parts held relatively to each other by friction or gripping
Dispositif de fermeture pour regard de chaussée à cadre de support d'un panneau monté articulé sur le cadre par des moyens d'articulation indémontables