| 摘要 |
PURPOSE:To prevent the solidification of the excavated soil by providing a partition and a facing chamber in front of a shield outer tube furnishing a specific circular section, positioning an arm for revolution in the facing chamber, and providing a driving device for a cutting group for cutting work in the arm for revolution. CONSTITUTION:A solar cutter 3 is rotated by a driving source 27, and planetary cutters 4a and 4b are rotated by a driving source 38 from solar sprockets 31a and 31b to planetary sprockets 30a and 31b through chains 33 and 34. Then, the whole body of a cutter group 2 is rotated by a driving source 26 provided at the center of each circle respectively. Then, the earth and sand of the excavated facing enters a facing chamber 6, a mud forming agent is poured, and they are stirred by stirring blades 11a 11b, 18, and 21, and an arm 15, converting into a mud with a fluidity and an impermeability. And it is exhausted by an earth-moving device 39 while keeping a balance of the pressure of the mud and the earth pressure of the facing. In such a way, the solidification can be prevented. |
