Rotary type adaptor for casing for excavation of underground pile and method of excavating underground pile using the adapter

摘要

Problem to be solved: to provide a means for safely drilling underground piles.In the lower adapter 30,A hexagonal hole is provided in the lower inside of the hexagonal hole.The upper adaptor 20 and the lower adaptor 30 are pivotally supported to each other by using the above holesOn the other handAn engaging member having an orthorhombic convex portion is provided.The support is pivotally supported by the upper adaptor 20 by means of an appropriate means, andBetween the coupler and the upper adapterA spring is provided and the end of the engagement is applied to the upper adapterAlways biasing this engagement end toward the upper adapterWhen the position of the lower adapter 30 relative to the upper adapter is alignedA stopper provided in the lower adaptor 30 engages the orthorhombic convex portion of the carrierIn addition, by the both stoppers abutting,The lower adapter 30 is prevented from rotating relative to the upper adapter 20.Selection diagram