Procedure for the Construction of underground large diameter piles and Soil Drilling Tool

摘要

A small diameter cylindrical pilot core (15) made of mechanically erodible materials is provided in the ground, extending along the central axis of a large diameter underground pile to be constructed. Then, the soil around the core pilot (15) is excavated, using the same core as a guide for a drilling tool (20). This tool has a central cylindrical guiding cavity (26) inserted around the core (15), lower cutters (21, 21') for breaking up the soil under the tool and inner cutters (28) arranged above the cylindrical cavity (26), for milling the top of the core (15) as the tool moves downward guided along the core.