| 摘要 |
PROBLEM TO BE SOLVED: To provide an earth drill machine capable of miniaturizing a base end member of a lower boom, and capable of also shortening the length of the lower boom. ! SOLUTION: An earth drill machine 1 comprises a base machine 2, telescopic booms 11, 12 and 13 having the base end attached to an upper turning body 3 of the base machine 2 so as to be able to undulate, and expanding the length and a Kelly-bar 17 suspended and held by a lifting rope suspended from the tip of the telescopic booms. The earth drill machine 1 further comprises a hydraulic cylinder 14 having one end connected to a front frame 10 and having the other end connected to the base end of the lower boom 11. A plate-like base end member 19 of the lower boom 11 is constituted as a plate-like base end, and the plate-like base end comprises a base end extension part 19a extended in the direction orthogonal to the direction for positioning the Kelly-bar 17. The other end of the hydraulic cylinder 14 is rotatably connected to a supp |
