Adaptor for underground pile excavation casing and underground pile excavation method using the adapter

摘要

To provide means for safely and reliably excavating a circumference of underground pile.SOLUTION: An upper adapter consisting of a cylinder is provided. A plate is provided on an upper part of the cylinder. A connecting portion made of hexagonal columns is erected on the upper surface of the center of the plate. A perforated upper collar is provided on the outer periphery of a lower part of the cylinder. A detent protrusion is provided in the vicinity of the hole. A lower adapter consisting of a cylinder with the same diameter as the upper adapter is provided. In the lower adapter, a perforated lower collar is provided on the outer periphery of an upper edge, and a perforated connection flange is provided on the outer periphery of a lower edge. The upper adapter and the lower adapter are connected so that they can be opened and closed with hinges. A detent hole is drilled close to the hole in the lower collar. Means for maintaining the closed position between the upper adapter and the lower adapter is provided with a fixed side perforated plate body, a rotating side perforated plate body, a slider case, and a slider as main parts.SELECTED DRAWING: Figure 4