Method for core drilling in loose to solid ground and for taking samples from the same, in which the initial tube is drilled into the ground by means of a drilling system with initial tube and drill bit fastened thereto at the bottom, and with a possible attachable drill tube consisting of one or more drill tube sections, by rotation and superimposed ramming, wherein within the initial tube, a sleeve or a drill core catcher travels axially with the initial tube, characterized in that a) the initial pipe with its drill bit arranged at the end as well as the possible drill pipe is drilled into the ground in a rotating and hammering manner by means of a drivable drill head which can be subjected to hammering impacts, while the sleeve in the initial pipe is held by the latter without rotation as a result of the drill core growing relatively into the sleeve and is pressed down from above by a pressure, flushing and recovery pipe, so that the sleeve moves downwardly in the axial direction with the initial tube and thus a drill core grows into the interior of the sleeve, wherein the pressure, flushing and recovery tube either rotates along with the initial tube and the possible drill tube and pressurizes the sleeve without rotation via a sleeve adapter with parts which can be rotated relative to one another or a rotary disc body as drill head adapter rotates at the top and is connected to the rotating drill head and the pressure, flushing and recovery tube pressurizes the sleeve without rotation, b) after the sleeve has been filled, the drill head is lifted off the initial pipe or the possible drill pipe and, by unscrewing any drill pipe still above the bottom above the initial pipe, the pressure, flushing and recovery pipe is exposed and is pulled out of the initial pipe together with the sleeve and the sleeve is detached from the pressure, flushing and recovery pipe. a) the initial pipe with its drill bit arranged at the end as well as the possible drill pipe is drilled into the ground in a rotating and hammering manner by means of a drivable drill head which can be subjected to hammering impacts, while the sleeve in the initial pipe is held by the latter without rotation as a result of the drill core growing relatively into the sleeve and is pressed down from above by a pressure, flushing and recovery pipe, so that the sleeve moves downwardly in the axial direction with the initial tube and thus a drill core grows into the interior of the sleeve, wherein the pressure, flushing and recovery tube either rotates along with the initial tube and the possible drill tube and pressurizes the sleeve without rotation via a sleeve adapter with parts which can be rotated relative to one another or a rotary disc body as drill head adapter rotates at the top and is connected to the rotating drill head and the pressure, flushing and recovery tube pressurizes the sleeve without rotation, b) after the sleeve has been filled, the drill head is lifted off the initial pipe or the possible drill pipe and, by unscrewing any drill pipe still above the bottom above the initial pipe, the pressure, flushing and recovery pipe is exposed and is pulled out of the initial pipe together with the sleeve and the sleeve is detached from the pressure, flushing and recovery pipe.