Abstract: A method for drilling holes in soil or rock, especially for producing prestressed ground anchorage. A hole is drilled by a drill column formed of lengths of pipe with a drill bit driven by a rotary and/or percussive drive. The wall of the borehole is supported by a casing formed of lengths of pipe driven by a rotary and/or percussive drive of a drilling tool. The lengths of pipe of the drill column and the casing are taken from a magazine by machine and transferred back to the magazine after drilling the hole. Each length of pipe for the drill column is taken sequentially from the magazine by the drive of the drilling tool for the drill column and each length of pipe for the casing is taken sequentially from the magazine by the drive of the drilling tool for the casing. Each length of pipe for the drill column and each length of pipe for the casing is returned sequentially to the magazine.

Abstract: The anchoring element has at least one anchor traction member 1 stressable against an abutment 3 and kept longitudinally movable in the ground by an envelope 5. An anchor body 6 is connected with this anchor traction member 1 at its end facing the bottom of the anchor bore. The anchor body 6 interacts with at least one pressure member 1' under pressure. This pressure member 1', cooperating with the surrounding compression body 2, is also extended, as a traction member 1' for tensioning against the abutment 3, up to the ground surface. The traction member 1' cooperating with the compression body 2 is this way used on one hand, for pressure, and on the other hand for traction.