| 摘要 |
PURPOSE: A casing joint processing method for maintaining the hollow wall of a micropile is stably embedded into the ground and prevents the rigidity degradation of an expansive tube part and a contractive tube part. CONSTITUTION: A casing joint processing method for maintaining the hollow wall of a micropile comprises the following steps: inserting an expansive tube forming punch into one end of a casing (100) to expand one end of the casing and to form an expansive tube part (110); inserting a contractive tube forming punch into the other end of the casing to contract the other end of the casing and to form a contractive tube part (120); and processing the expansive and contractive tube parts and forming a bellows screw part (130) without reducing the thickness of the expansive and contractive tube parts. |
