| 摘要 |
The digging roller is provided with a roller main body rotating around an axis in an approximately horizontal direction, and a plurality of digging bits dotted in an outer peripheral surface of the roller main body. The digging bits have a first arrangement pattern moving the dug soil to an inner side in an axial direction, and a second arrangement pattern moving the dug soil to an outer side in the axial direction. Accordingly, an accumulation portion of the dug soil is dispersed into at least two positions. |
