| 摘要 |
PURPOSE: A ground drilling device is provided to perform consecutive drilling processes without the change of bits even in a soil layer, since a rake and a bit are coupled. CONSTITUTION: A ground drilling device comprises a body portion(23), a bit rod, a bit(22), a rake rod(24), and a rake(25). A rake rod hole(232) and a bit rod hole are formed in the body portion. The bit rod is inserted into the bit rod hole. The bit is coupled with the end of the bit rod. The rake rod is inserted into the rake rod hole. The rake is coupled with the end of the rake rod.
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