| 摘要 |
PROBLEM TO BE SOLVED: To provide a shield excavator for excavating soil while controlling excavated soil in the chamber of the shield excavator to be in a plastically flowing condition as predetermined to prevent the collapse of a working face and for efficiently discharging it with reflux muddy water. SOLUTION: A detecting rod 17 is protruded on the back face of a cutter plate 1b of the shield excavator 1 for detecting the amount of resistance torsion (bending stress) of the excavated soil in the chamber 2. When a stress value is a predetermined value, it determines that the excavated soil is in a normal plastically flowing condition. When the stress value is the predeterminedt value or greater, the amount of a mud forming material (muddy water) to be supplied into the chamber 2 is increased, and when it is not greater than the predetermined value, the amount of the excavated soil to be discharged from the chamber into reflux muddy water 9 is reduced. COPYRIGHT: (C)2006,JPO&NCIPI |
