| 摘要 |
PROBLEM TO BE SOLVED: To improve the efficiency of excavation by the tip end metal fitting of the rotary buried pile. SOLUTION: Four excavation cutting edges 20 are arranged on an excavated surface 10A of a circular plate 10. Each excavation cutting edge 20 is inclined at a predetermined angle toward the circumferential edge section from the center of the plate 10. The four excavation cutting edges 20 are wholly inclined at predetermined angles in the opposite direction of the rotational direction in the case of excavation. The excavation cutting edges 20 are radially arranged from the center of the plate 10 at even intervals. Among the excavation cutting edges 20, the first and second bent plates 30 and 40 are formed. The first bent plate 30 is bent toward the excavation side, and the second bent plate 40 is bent toward the rotary buried pile side. COPYRIGHT: (C)2006,JPO&NCIPI
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