Abstract: The invention relates to a rotary drive assembly for a drill rod having an outer tube and an inner rod extending at least in sections inside the outer tube, comprising a first gear unit having at least a first drive unit for driving the inner rod in a rotating manner and a second gear unit, which is offset to the said first gear unit in the longitudinal direction of the drill rod and has at least a second drive unit for driving the outer tube in a rotating manner. In accordance with the invention provision is made for the second drive unit to be spaced from the second gear unit and for the second drive unit to be arranged adjacent to the first drive unit on the first gear unit.

Abstract: The invention relates to a ground working implement and to a method for introducing a working element into the ground, using vibrations. By means of a vibration generator vibrations are generated and transmitted to the working element during its introduction into the ground. According to the invention a gentle vibration generation and transmission are brought about in that the vibration generator has at least one vibrating piston mounted in linearly displaceable manner in a casing spaced from the working element. The vibrating piston is driven in oscillating manner in the casing for generating vibrations. The vibrations are transmitted via the casing to the working element.