| 摘要 |
PROBLEM TO BE SOLVED: To prevent a mud discharging pipe and maintain from being clogged with mud working efficiency while maintening suction performance by discharging mud uniformly and continuously. SOLUTION: A slurry transport device is constituted in such a manner as to freely mix air with slurry 60 within a slurry retaining space 4 by connecting an air mixing pipe 12 to a water injection pipe 9. Consequently, a mud discharging pump 10 is operated with slight cavitation.
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