| 摘要 |
PROBLEM TO BE SOLVED: To prevent sediment from flowing in from a joint between an excavation member and a pipe body part in excavation work.SOLUTION: An excavation member 1 comprises a cylindrical base body 2 closed at the lower end, and a rotary blade 3 for excavating soil by rotating around the axis together with this base body 2 provided on an outer peripheral surface of this base body 2. A columnar projection part 4 is also provided on the outer peripheral surface while projecting outward in its radial direction. A pipe body part 5 comprises a cylindrical pipe body 6, and a downward projecting abutting part 7 provided in a lower end part of this pipe body 6. This abutting part 7 is constituted of a first extending part 8a and a second extending part 8b forming an L shape by mutually crossing, and an abutting surface 9 having an oblique upward plane normal line is formed in an internal angle constituted by crossing both the extending parts 8a and 8b. The projection part 4 is allowed to abut on this abutting surface 9 to make abutting force act, the excavation member 1 is thereby pressed to the pipe body part 5, and a clearance g is generated in a joint between the excavation member 1 and the pipe body part 5, thereby preventing sediment from flowing in from this clearance g. |
