| 摘要 |
PROBLEM TO BE SOLVED: To allow an inner excavation drilling machine to be fitted to any position inside an excavation casing 4, and to increase torque and improve the number of revolution.SOLUTION: An inner excavation drilling machine 1 is fitted inside an excavation casing 4 used for an all-casing method. The inner excavation drilling machine 1 consists of a drive unit 2 detachably fixed inside the excavation casing 4 and a bottom enlarged bucket 3, an auger 23, or a drilling bucket 24 interlocked and connected to the drive unit 2. The drive unit 2 comprises: a casing body 5; a drive shaft 6 which is disposed in a central part of the casing body 5 in a rotatable and vertically liftable manner, and to which the bottom enlarged bucket 3, the auger 23, or the drilling bucket 24 is connected; a rotation drive part 7 for rotationally driving the drive shaft 6; a feeder device 8 for vertically lifting the drive shaft 6; and a chuck device 9 pressing and contacting an inner wall surface of the excavation casing 4, and fixing the inner excavation drilling machine 1 itself to the inner wall surface of the excavation casing 4. |
