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
Vorrichtung für ein strassenmannloch mit einem stützrahmen zum schliessen einer am rahmen angelenkten platte unter verwendung von nicht demontierbaren gelenkmitteln