Discharge method null of the excavation earth and sand in

摘要

PURPOSE:To facilitate the discharging by forming an air stream in a suction hose provided in a propelling tube and putting the sediment with the preset grain size on the air stream in the solid state and moving it to the vertical shaft side. CONSTITUTION:The ground is drilled by a cutter bit 1 provided at the tip of a guide tube (a), the drilled sediment 2 is accumulated in a box 4 by a screw conveyor 3. A suction hose (x) is installed in a propelling pipe (b), the tip of the hose (x) is put in the box 4, the rear end side of the hose (x) is connected to a blower (e) via a receiver tank (d). The blower (e) is driven, the sediment having passed a net 5 is put on the air stream and moved to the departure vertical shaft side, the drilled sediment 2 is discharged from the tank (d). The sediment 2 can be easily discharged without staining the inside of the propelling pipe (b) and clogging the hose (x).