shi - the covering works manner due to rudo excavation, the original pushing device for secondary lining, and panel null for secondary lining

摘要

PURPOSE:To make it possible to execute a secondary lining at the same time as primary lining and to greatly improve execution efficiency. CONSTITUTION:A secondary lining is carried out by panels 18 and 20 separated in up and down, and a lower secondary lining is executed while extruding a lower panel by an initial pushing device at the beginning. After that, a guide rail 46 formed on a side wall of the lower secondary lining is used to make a segment block, etc. convey, and the secondary lining is constructed by extruding a secondary lining upper panel 18 to slide with the completion of the primary lining.