METHOD AND DUAL REAMER APPARATUS FOR FORMING BORED HOLE

摘要

A method and apparatus for creating a reamed hole below the surface are Disclosed. The reaming apparatus is arranged to be connected to one or more boring stems and has an interior section and an exterior section. The interior section is rotatable independently of the exterior section. Reamed holes of various cross-sections can be produced by appropriate selection of the cross-section of the exterior section.