| 摘要 |
<p>PURPOSE: A boring method using a boring machine with a variable boring diameter is provided to facilitate the insertion of piles by boring a greater hole than the diameter of the pile. CONSTITUTION: A boring method using a boring machine with a variable boring diameter comprises the following steps: inserting a pile (10) to the ground and a boring machine into the pile to move the boring machine to a boring part; and boring the pile using the boring machine which is moved to a boring area. The diameter of the boring machine is smaller than the inner diameter of the pile. The bit diameter of the boring machine is expanded when boring.</p> |
