Drilling machine for drilling into the ground comprises a first drive for rotating a first drilling column about its own axis and a second drive for rotating a second drilling column about its own axis

摘要

Drilling machine comprises a first drive (11) for rotating a first drilling column (12) about its own axis and a second drive (21) for rotating a second drilling column (22) about its own axis. The first drilling column is arranged concentrically around the second drilling column and the rotating speed of the first drilling column and of the second drilling column can be independently controlled. Preferred Features: The first and second drilling columns slide axially about a short section. The first and second drilling columns axially slide into each other over a section of 0-20 cm, especially 10-20 cm.