Patent ID: 7004686

Claim:
A method for drilling a hole in soil or rock material and forming an anchorage in said hole, said method comprising the steps of forming a bore hole by the introduction of a drill bit, upon completion of the bore hole, introducing a fluid under pressure into at least one hollow space, extending substantially in a longitudinal direction of the bore hole, of at least one expandable element of a drill rod assembly, or into at least one hollow space of at least one expandable element connected with the drill rod assembly, to at least partially widen an outer periphery of said at least one expandable element powered with the fluid, in abutment with a bore hole wall, wherein a plurality of mutually separated expandable elements having hollow spaces are provided about at least one of a periphery and a length of the bore hole to be produced, to widen said outer periphery, and welding each of a plurality of expandable elements each having a hollow space over a portion of their lengths, to one another or to the drill rod assembly, respectively.