| 摘要 |
PURPOSE: A water jet type ground drilling machine is provided to facilitate the drilling work by jetting high pressure water downward in a bit when drilling the ground by using a bit combined to a bit head. CONSTITUTION: In a water jet type ground drilling machine(10), the front end of a bit head(100) is screw-combined to be inserted in the inner side of a bit(200). A protrusion is formed in an inner hole(250) of the bit to be combined to the bit head. Plural nozzle fixing holes are installed in a nozzle fixing plate(300) to be combined with nozzles(310). The nozzles jet the high pressure water to the ground through the inner hole of the bit. |
