| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for drilling without generation of removed earth, by retaining the excavated earth in a hollow pile, and therefore building the hollow pile without generating the removed earth from the hollow pile, and to provide an apparatus for use in the method. SOLUTION: Excavating facilities, having a driving portion 7 for vertically moving a tower 8 erected on the earth, are provided. An excavating rod 2 which is inserted into a hollow pile 1 suspended by the driving portion 7, has an excavating head 3 attached to a lower end thereof, and a spiral blade 4 attached to a portion immediately above the excavating head 3. The excavating rod 2 has a connecting portion 6 formed at an upper end thereof, of which the connecting portion is connected to the driving portion 7 or another excavating rod to be joined thereto. Furthermore, the excavating rod 2 has agitators 5 formed thereon at prescribed intervals, in a section between the connecting portion 6 and the spiral blade 4.
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