| 摘要 |
PROBLEM TO BE SOLVED: To provide control for wholly and efficiently discharging a deposit in the middle when removing earth from an underground work site having the depth via a lifting passage such as a shaft, and suitable when assembling a system as an automatic control system. SOLUTION: This deep depth earth removal system is provided with a squeeze pump 13 being a force feed pump and a lower discharge screw feeder 7 for upwardly sending only air by receiving removal earth, muddy water and the air from the underground work site, and is provided with an earth removal tank 16 for upwardly sending the removal earth and the muddy water via the squeeze pump 13 by this screw feeder 7. A level gauge 8 is arranged in the earth removal tank 16. An electromagnetic flowmeter 9 is arranged between the screw feeder 7 and the squeeze pump 13 of the earth removal tank 16. A rotating speed of the squeeze pump 13 is controlled by a value of these level gauges 8, and rotation of the screw feeder 7 is controlled by a measured value of the electromagnetic flowmeter 9. COPYRIGHT: (C)2004,JPO |
