| 摘要 |
PURPOSE:To prevent the action of resistance by movably installing a channel type cover to a pedestal for a guide and housing a section except a front section in the through-ditch cutting and propulsion direction of a double chain cutter, to which a pair of chain cutters are arranged, into the cover. CONSTITUTION:An arched guide member 1 made of steel is disposed concentrical ly on the facing side in the tunnel of a poor subsoil 9, and a pedestal 3 for a guide is disposed outside a moving frame 14 movable along the guide member 1. A channel type cover 4 slidable in the longitudinal direction to the pedestal 3 for the guide is installed while a section except the front section in the through-ditch cutting and propulsion direction of a double chain cutter 8 for cutting a through-ditch composed of a pair of chain cutters 6, 7 is housed in the channel type cover 4. When a chain cutter drive 5 is driven, the chain cutters 6, 7 are circulated and driven, and a double chain cutter 27 with the channel type cover is moved forward and excavated soil is discharged. |
