| 摘要 |
PURPOSE:To easily dispose of cores by raising the efficiency of operations by a method in which cores of obstacles are cut off by an excavation tube having a blade on its tip and discharged with the excavating tube. CONSTITUTION:An excavating tube 17 having a cutting blade 21 on its tip is advanced vertically into an obstance under the ground to cut off a core 28 from the obstacle. The core 28 so cur off is pulled out with the tube 17 and separated from the tube 17. since the core 28 cut from the obstacle by the tube 17 is once discharged, the efficiency of operations can be raised as compared with the conventional method in which an obstacle is broken and discharged gradually. The disposal of the core can be made easier because no broken pieces are scattered. |
