DISCHARGING PROCESS OF EXCAVATED EARTH AND SAND AND DEVICE THEREOF FOR EARTH PRESSURE TYPE SHIELD TUNNELING METHOD

摘要

PURPOSE:To stabilize facing under high water pressure by excavating bedrock as the bedrock is kept down by means of compressed air, and conveying the earth and sand thereof after supplying compressed air into an earth and sand tank and into a screw conveyor provided at the rear of a shield machine to convey and bring in excavated earth and sand. CONSTITUTION:An electric motor 26 is started with a stop valve 24 in 'open' and air, which is compressed by an air compressor 25 connected to the elctric motor 26, is accumulated in a receiver tank 23 with pressure. Compressed air in a decompression device 21 is decompressed with a stop valve 22 in 'open' and sent to an earth and sand tank 10 through and airpipe 27 and a pressure cylinder portion 11 with an airpipe valve 18 in 'open' while the excavated earth is conveyed by driving a screw conveyor 5 to 7 with gate 9, 16 in 'open' simultaneously with a shield machine 1 starting to excavate. The earth and sand in the earth and sand tank 10 is discharged to a muck steel car 19 by a screw conveyor 14 with a gate 13 in 'open' simultaneously with the release of the pressure in the tank 10 and conveyed to and earth discharge facility.