JPS6458500A - Abrasive material fixed-quantity supply method - Google Patents

Abstract

PURPOSE: To eliminate partial abrasion or torsion of a nozzle for connecting the feeder and a nozzle to each other by utilizing a space between both inner and outer steel pipes of a double steel pipe which is a turning shaft of the nozzle to feed abrasive to the feeder integrated with the double steel pipe in a natural drop system. CONSTITUTION: A nozzle 4 supported by a guide roller 6 through a double steel pipe 2 is turned along the inner surface of a pipe 5 to be cut by a motor 9 of a driving part 1 installed on the upper end of the pipe 5 to be cut, which is inserted under the ground. Simultaneously, abrasive is fed in a natural drop system to a feeder 3 integrated with the double steel pipe 2 through a feed path 16 formed between both inner and outer pipes 2a, 2b of the double steel pipe 2. The abrasive is transported from the feeder 3 through the transport pipe 3a to the nozzle 4. The abrasive is sprayed to the pipe 5 to be cut together with high pressure water jetted from the nozzle 4 through a high pressure water piping 20 stored in the inner steel pipe 2b of the double steel pipe 2 and air, thereby cutting the pipe 5 at a designated position.