A foundation engineering machine and method for producing a trench in the ground include a substantially vertical mast, a diaphragm wall apparatus displaceably supported in a longitudinal direction of the mast for producing the trench, and a bar-shaped holder, at the lower end of which the diaphragm wall apparatus is mounted and with which the diaphragm wall apparatus is linearly displaceable along the mast. An upper first clamping sledge with a first clamp for releasably clamping the bar-shaped holder and a lower second clamping sledge with a second clamp for releasably clamping the bar-shaped holder are movably supported on the mast. The first clamping sledge and the second clamping sledge are movable relative to each other, and the lower second clamping sledge has a connector for mounting an additional lifting device disposed on the ground, with which a force can be applied in the longitudinal direction onto the second sledge.

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.

The invention relates to a foundation engineering machine and a method for producing a trench in the ground with a foundation engineering machine having a substantially vertical mast, a diaphragm wall apparatus which is displaceably supported in the longitudinal direction of the mast for producing a trench in the ground, and a bar-shaped holding means, at the lower end of which the diaphragm wall apparatus is mounted and with which the diaphragm wall apparatus is linearly displaceable along the mast. According to the invention provision is made in that on the mast an upper first clamping sledge with a first clamping means for releasably clamping the bar-shaped holding means and a lower second clamping sledge with a second clamping means for releasably clamping the bar-shaped holding means are movably supported and the first clamping sledge and the second clamping sledge are movable relative to each other and in that the lower second clamping sledge is provided with a connecting means for mounting an additional lifting device which is arranged on the ground and with which a force can be applied in the longitudinal direction onto the second sledge.

The invention relates to a foundation engineering method and a construction apparatus for producing a columnar structure in the ground, in which a foundation engineering tool is driven in a rotating manner about an axis of rotation and introduced with a feeding motion into a ground, wherein the columnar structure is produced in the ground. According to the invention it is provided that during the production of the columnar structure a rotating motion and a feeding motion of the foundation engineering tool are recorded over time and forwarded to an evaluation unit, in that by means of a sensor means at least one further processing parameter is recorded over time during the production of the columnar structure in the ground and is forwarded to the evaluation unit and in that by the evaluation unit a three-dimensional model of the columnar structure is produced and displayed.

The invention relates to a foundation engineering method and a construction apparatus for producing a columnar structure in the ground, in which a foundation engineering tool is driven in a rotating manner about an axis of rotation and introduced with a feeding motion into a ground, wherein the columnar structure is produced in the ground. According to the invention it is provided that during the production of the columnar structure a rotating motion and a feeding motion of the foundation engineering tool are recorded over time and forwarded to an evaluation unit, in that by means of a sensor means at least one further processing parameter is recorded over time during the production of the columnar structure in the ground and is forwarded to the evaluation unit and in that by the evaluation unit a three-dimensional model of the columnar structure is produced and displayed.

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.

A method for manufacturing a one-piece element defining a lost formwork for forming drill guides, includes mixing a volume of hydraulic binder including a first volume of water and a second volume of a bonding element and a volume of an organic base; molding to obtain a one-piece element including at least one cylindrical portion with a radius of at least 40 cm; drying the mixture molded forming a one-piece element, and recessing a central portion of material of the one-piece element in a central zone of the cylinder portion to form a guide.

The invention relates to a prestressed diaphragm wall in the ground (10) including a concrete panel (52), at least one anchor tube open at its upper end (38) and closed at its lower end (36) and, embedded at least partially in the concrete panel, at least one cable (60) extending inside the anchor tube (30), a lower portion of the cable (60) being fixed to said tube (30), and a cable anchoring system (90), configured to hold the cable in tension (60) and secure its upper portion (68) to the upper portion of the concrete panel (52). It also relates to a method for making a prestressed diaphragm wall.

A reinforced concrete structure including a reinforcement made from a plurality of elongate longitudinal members of fibreglass or like material, disposed substantially parallel with one another in at least one predetermined direction. The elongate longitudinal members are coupled to one another by means of coupling members of fibreglass or formed by a strip of flexible polymer material. Metal and/or synthetic fibres are mixed with the concrete matrix to provide the structure with shear strength, making it possible substantially to reduce the number of coupling members.