Abstract: The invention relates to a construction machine for introducing a displacement tube into the ground, wherein the displacement tube comprises a tube base body and, at its lower end, a closure device which comprises at least one closure flap which is adjustable between a closed position, in which the displacement tube is closed downwards by the at least one closure flap, and an open position, in which filling material is discharged from the displacement tube into the ground for forming a filling material column, wherein the construction machine comprises a feed drive for introducing and retracting the displacement tube into and out of the ground, respectively.

Abstract: The invention relates to a construction machine for introducing a displacement tube into the ground, wherein the displacement tube comprises a tube base body and, at its lower end, a closure device which comprises at least one closure flap which is adjustable between a closed position, in which the displacement tube is closed downwards by the at least one closure flap, and an open position, in which filling material is discharged from the displacement tube into the ground for forming a filling material column, wherein the construction machine comprises a feed drive for introducing and retracting the displacement tube into and out of the ground, respectively.

Abstract: The invention relates to a construction device and to a method for operating this construction device, comprising a carrier device, an approximately vertical mast, which is mounted on the carrier device, a movement element, which is vertically movable along a linear guide on the mast, and at least one GPS receiving unit, which is arranged in the region of the mast. According to the invention, it is provided that the at least one GPS receiving unit is attached to the movement element and that the at least one GPS receiving unit can be moved between an upper, first measuring position and a lower, second measuring position by means of the movement element.

Abstract: The invention relates to a construction device and to a method for operating this construction device, comprising a carrier device, an approximately vertical mast, which is mounted on the carrier device, a movement element, which is vertically movable along a linear guide on the mast, and at least one GPS receiving unit, which is arranged in the region of the mast. According to the invention, it is provided that the at least one GPS receiving unit is attached to the movement element and that the at least one GPS receiving unit can be moved between an upper, first measuring position and a lower, second measuring position by means of the movement element.

Abstract: The invention relates to a ground-working machine and a method for producing wall panels, with the 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 first screw conveyor and at least one second screw conveyor are arranged, the second screw conveyor being axially spaced apart from the first screw conveyor. According to the invention it is provided that at least on one drilling and mixing tool at a lower end the first screw conveyor is formed with an outer diameter that is greater than an outer diameter of the second screw conveyor which is arranged above the first screw conveyor.

Abstract: The invention relates to a ground-working machine and a method for producing wall panels, with the 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 first screw conveyor and at least one second screw conveyor are arranged, the second screw conveyor being axially spaced apart from the first screw conveyor. According to the invention it is provided that at least on one drilling and mixing tool at a lower end the first screw conveyor is formed with an outer diameter that is greater than an outer diameter of the second screw conveyor which is arranged above the first screw conveyor.