| 摘要 |
PURPOSE:To pump-up and transport soil and sand by installing a screw reed on the outer periphery of the shaft part of a soil excavator and covering the screw reed with the casing of a suction nozzle and mechanically introducing the soil and sand which are excavated by the revolution of an excavating shaft successively into the casing. CONSTITUTION:When the revolution of a driving machine 12 is transmitted to an excavating head 9 through an excavating shaft 10, and a thrust force is added by a feeding mechanism 18, the excavating head 9 advances with revolution, and the soil and sand at the front are excavated and heaped-up in the periphery. When excavation proceeds further, the heaped-up soil and sand are caught by the screw reed 11 on the outer periphery of an excavating shaft 10, and transported successively in a casing 1. The suction force from a main suction pipe 8 always operates in the casing 1 during operation, and accelerates pumping-up and transportation of soil and sand in the casing 1, and the air from the intake opening 4 of an air feeding pipe 2 is mixed into the soil and sand in pumping-up and transportation, and the soil and sand are loosened to the suitable state for suction and transportation. |
