Abstract: The invention relates to a drill rod coupling having a sleeve-shaped coupling receptacle, a pin-shaped coupling member which can be inserted axially into the coupling receptacle to form a torque proof connection, and at least one locking bolt which is directed transversely to the axial coupling direction and extends, in a locked coupling position, between the coupling receptacle and the coupling member into a locking recess, wherein the locking bolt is mounted so as to be radially adjustable between an unlocking position and a locking position. Efficient coupling is achieved in that a tensioning device is provided by means of which the locking bolt is pressed into its locking position with a predefined tensioning force, and in that the locking bolt is connected to a resetting member by means of which the locking bolt can be reset into the unlocking position when a resetting force is applied.

Abstract: The invention relates to a device and a method for reaming a flight gap of a drill flight of a drilling tool, comprising a base carriage which can be displaceably mounted along a mast of a drilling apparatus, a reaming element which is configured to engage in the flight gap of the drilling tool, wherein soil material adhering to the drilling tool can be scraped off by the reaming element upon rotation of the drilling tool, and a support arm on which the reaming element is held and which is mounted movably relative to the base carriage between a retracted position, in which the reaming element is spaced apart from the drilling tool, and a reaming position, in which the reaming element engages in the flight gap for reaming soil material.

Abstract: The invention relates to a drill rod coupling having a sleeve-shaped coupling receptacle, a pin-shaped coupling member which can be inserted axially into the coupling receptacle to form a torque proof connection, and at least one locking bolt which is directed transversely to the axial coupling direction and extends, in a locked coupling position, between the coupling receptacle and the coupling member into a locking recess, wherein the locking bolt is mounted so as to be radially adjustable between an unlocking position and a locking position. Efficient coupling is achieved in that a tensioning device is provided by means of which the locking bolt is pressed into its locking position with a predefined tensioning force, and in that the locking bolt is connected to a resetting member by means of which the locking bolt can be reset into the unlocking position when a resetting force is applied.