SHIELD TYPE ROOF SUPPORT SYSTEM SHIELD TYPE ROOF SUPPORT SYSTEM

摘要

The roof of an underground excavation is supported by a lining, and a conveyor extending along the mine face is reinforced at least in a section facing away from the mine face and supporting at least one cantilever beam and a hydraulic advancement assembly. A floor base of the lining is provided with recesses for guidingly accommodating the cantilever beam in the floor base, so as to permit relative movement of the conveyor and the lining in the direction perpendicular to the mine face, the lining and the conveyor alternately serving as retaining means for each other during the step-wise advancement of the combination.