DRILLING MACHINE AND DRILLING METHOD

To provide a drilling machine which drills a water bottom ground with a simple structure.SOLUTION: A drilling machine 10 which drills a ground (a water bottom ground) 2 comprises a body part 11 which locates upper than a water surface WS and has a rotation driving source (a motor), and a rotary drilling device 12 which extends downwardly from the body part 11. The rotary drilling device 12 has a rod part 13 which consists of a plurality of cylindrical rod members 13a connected in the vertical direction, and a ground drilling part 14 connected to a lower end of the rod part 13. The rod part 13 and the ground drilling part 14 rotate by rotation driving force from the rotation driving source (the motor) of the body part 11 with the vertical direction as the rotational axis. The ground drilling part 14 rotates and drills the ground 2.SELECTED DRAWING: Figure 1 【課題】簡易な構成で水底地盤を掘削する。【解決手段】地盤（水底地盤）２を掘削する掘削機１０は、水面ＷＳより上方に位置して回転駆動源（モータ）を有する本体部１１と、本体部１１から下方に延びる回転掘削装置１２とを備える。回転掘削装置１２は、上下方向に連結された複数の筒状のロッド部材１３ａからなるロッド部１３と、ロッド部１３の下端に連結される地盤掘削部１４とを有する。ロッド部１３及び地盤掘削部１４は、本体部１１の回転駆動源（モータ）からの回転駆動力により上下方向を回転軸として回転する。地盤掘削部１４は地盤２を回転掘削する。【選択図】図１