MULTI-PART SUPPORT FRAME FOR CIRCUMFERENTIALLY YIELDABLE SUPPORTS OR GALLERIES,IN PARTICULAR OF MINE GALLERIES

摘要

A multi-part circumferentially yieldable mine arch comprises channel-section segments 5, 6 which overlap and internest in the same orientation, and connecting means 10, 10a which accept only the transverse forces occurring at the overlap. For setting and controlling the resistance to yielding a number of clamps 13 are provided which are attached to the channel- section flanges, against which the ends of the channel-section segments 5, 6 bear. IMAGE