Ground-working machine and method for producing wall panels

A ground-working machine having at least two elongate drilling and mixing tools arranged parallel to each other, which comprise a rod-form base body, on which a lower first screw conveyor and at least one upper second screw conveyor are arranged, the at least one upper second screw conveyor being axially spaced apart from the lower first screw conveyor,

• wherein
• on at least one of the at least two elongate drilling and mixing tools, at a lower end of the lower first screw conveyor, the lower first screw conveyor is formed with an outer diameter that is greater than an outer diameter of the at least one upper second screw conveyor, which is arranged above the lower first screw conveyor,
• a first transverse yoke and a second transverse yoke are arranged between the lower first screw conveyor and the at least one upper second screw conveyor, the first transverse yoke and the second transverse yoke connecting the at least two elongate drilling and mixing tools to each other,
• between the at least two elongate drilling and mixing tools, a rod-form intermediate element is arranged, which has a third screw conveyor in an upper area of the rod-form intermediate element,
• the intermediate element has, at least in a lower area of the intermediate element, a smaller outer diameter than an outer diameter of the neighboring at least two elongate drilling and mixing tools,
• in a space between the first transverse yoke and the second transverse yoke, the at least two elongate drilling and mixing tools comprise a fourth screw conveyor,
• the intermediate element does not comprise a screw conveyor in the space between the first transverse yoke and the second transverse yoke, and
• the fourth screw conveyor has a diameter greater than that of the at least one upper second screw conveyor, and
• the lower area of the intermediate element is connected via the first transverse yoke and forms an exchangeable unit, which is releasably connected by an axial shaft connector.