Abstract: A rotary driver 1 for a helical pile foundation 2 attached to a boom arm 3 of an excavator 5 forming a counter-support is described by means of which the helical pile foundation 2 can be screwed into or out of the ground in a defined direction. The rotary driver 1 is supplied by the excavator 5 with appropriate power, preferably hydraulic power, and is arranged at the front end of the boom arm 3 of the excavator 5. A rotary drive 6 is provided for this purpose at the front end of the boom arm 3 which transmits a drive torque 11 to the helical pile foundation 2, for which purpose a chucking device 7 for the helical pile foundation 2 is provided at the end of the rotary drive 6 facing toward the helical pile foundation 2. An additional counter-support 4 is arranged on the rotary drive 6, on the front end of the boom arm 3, or on the chucking device 7 and is anchored in the ground at the end opposite the area of arrangement.

Abstract: The invention relates to a driving device, in particular a screw foundation driving device, having an anchor with a rotational axis for receiving a driving tool, an outer rotor, which is arranged concentrically to the rotational axis of the anchor and can be rotationally driven by a motor, and an impact device from which an impact energy can be introduced into the anchor. By means of rolling bodies arranged circumferentially on the anchor, the anchor is mounted in the outer rotor in such a way that a relative movement between the anchor and the outer rotor can be executed in the direction of the rotational axis and a torque about the rotational axis can be introduced from the outer rotor to the anchor via the rolling bearings.

Abstract: The invention relates to a driving device, in particular a screw foundation driving device, having an anchor with a rotational axis for receiving a driving tool, an outer rotor, which is arranged concentrically to the rotational axis of the anchor and can be rotationally driven by a motor, and an impact device from which an impact energy can be introduced into the anchor. By means of rolling bodies arranged circumferentially on the anchor, the anchor is mounted in the outer rotor in such a way that a relative movement between the anchor and the outer rotor can be executed in the direction of the rotational axis and a torque about the rotational axis can be introduced from the outer rotor to the anchor via the rolling bearings.

Abstract: Disclosed is a method for driving a screwable foundation, which comprises a thread-type external helix that has a pitch on the outer contour thereof, into the ground. In said method, a striking force is applied to the screwable foundation in the driving direction in alternation with or at least temporarily simultaneously with a torque when the screwable foundation is driven into the ground.

Abstract: Disclosed is a method for driving a screwable foundation, which comprises a thread-type external helix that has a pitch on the outer contour thereof, into the ground. In said method, a striking force is applied to the screwable foundation in the driving direction in alternation with or at least temporarily simultaneously with a torque when the screwable foundation is driven into the ground.

Abstract: An erection system for the attachment of solar panels arranged areally adjacent one another and inclined toward the sun. The solar panels are held in rows by a multiplicity of holding members that are fastened to posts anchored in the ground by base members arranged substantially orthogonally with respect to the holding members and which have downwardly open U-profiles. The base members can be connected to the posts via mounting units. Each mounting unit has two clamping shells with semicircular recesses for abutment against the posts and substantially planar abutment surfaces for abutment against the side surfaces of the U-profile. Bores are arranged in the abutment surfaces of the clamping shells and corresponding bores are arranged in the side surfaces of the base member such that the base members can be fixed in a frictionally locking and/or positively locking manner to the posts by screw connections extending through the bores.

Abstract: A screwing device on a cantilever arm of a construction vehicle for screwing foundation installations into the ground has a suspension, a screw head, and an actuator. The actuator can be pivoted about two axes extending parallel to one another and transversely with respect to the longitudinal axis of the screw head. The articulation point on the screw head follows the motion of the pivoting lever on the longitudinal axis due to a migration of the articulation point from the longitudinal axis of the screw head occurring due to pivoting of the pivoting lever about the axes while screwing the foundation installation into the ground. The axes extend transverse to the longitudinal direction of the cantilever arm and are supplemented by at least one additional axis supported transversely with respect to said axes. This compensates for a migration of the articulation point in each direction.

Abstract: An erection system for the attachment of solar panels arranged areally adjacent one another and inclined toward the sun. The solar panels are held in rows by a multiplicity of holding members that are fastened to posts anchored in the ground by base members arranged substantially orthogonally with respect to the holding members and which have downwardly open U-profiles. The base members can be connected to the posts via mounting units. Each mounting unit has two clamping shells with semicircular recesses for abutment against the posts and substantially planar abutment surfaces for abutment against the side surfaces of the U-profile. Bores are arranged in the abutment surfaces of the clamping shells and corresponding bores are arranged in the side surfaces of the base member such that the base members can be fixed in a frictionally locking and/or positively locking manner to the posts by screw connections extending through the bores.

Abstract: An apparatus for placing foundation devices and/or pipes and/or augers in the ground, as an attachment to be attached to the boom of a construction vehicle, including a mounting hinged to a coupling point of the boom, and a drive head, which is rigidly connected to the mounting and configured as a rotational driving and/or drilling and/or impact drilling and/or pile-driving drive and to which the foundation device/pipe/auger for placement in the ground can be coupled. The coupling point can be displaced with respect to the drive head in at least one first direction which is transverse to the longitudinal axis of the foundation device/pipe/auger, and optionally in a second direction, which is transverse to the first direction. The mounting can be a universal joint in which a first joint axis extends so that a first and a second joint part can be displaced thereon, relative to each other, in the first direction, so as to displace the coupling point.

Abstract: A foundation screw with a tubular basic body having an encompassing helical screw thread for screwing into the ground. The foundation screw has a substantially cylindrical first longitudinal portion and a tapering second longitudinal portion. The first longitudinal portion merges tangentially with a convex jacket region of the second longitudinal portion having a radius of convexity R1, which has at least one value of the tube diameter D of the first longitudinal portion.

Abstract: A foundation screw with a tubular basic body having an encompassing helical screw thread for screwing into the ground. The foundation screw has a substantially cylindrical first longitudinal portion and a tapering second longitudinal portion. The first longitudinal portion merges tangentially with a convex jacket region of the second longitudinal portion having a radius of convexity R1, which has at least one value of the tube diameter D of the first longitudinal portion.

Abstract: An apparatus for placing foundation devices and/or pipes and/or augers in the ground, as an attachment to be attached to the boom of a construction vehicle, including a mounting hinged to a coupling point of the boom, and a drive head, which is rigidly connected to the mounting and configured as a rotational driving and/or drilling and/or impact drilling and/or pile-driving drive and to which the foundation device/pipe/auger for placement in the ground can be coupled. The coupling point can be displaced with respect to the drive head in at least one first direction which is transverse to the longitudinal axis of the foundation device/pipe/auger, and optionally in a second direction, which is transverse to the first direction. The mounting can be a universal joint in which a first joint axis extends so that a first and a second joint part can be displaced thereon, relative to each other, in the first direction, so as to displace the coupling point.

Abstract: A stand for holding a rod-shaped unit, particularly a Christmas tree, comprises a foot part, a seating region for the tree trunk, said seating region being located on the foot part, several holding elements, which are supported around an axis of symmetry of the stand and which are pivotable against spring force out of an open position into a holding position, their pivoting planes intersecting approximately in the axis of symmetry, and at least one flexible force transfer element, particularly a steel cable, which can be actuated by means of a tensioning device and which can be loaded in tension and which engages around the holding elements and which, when tightened, causes the holding elements to pivot towards the axis of symmetry into the holding position.

Abstract: A stand for holding a rod-shaped unit, particularly a Christmas tree, comprises a foot part, a seating region for the tree trunk, said seating region being located on the foot part, several holding elements, which are supported around an axis of symmetry of the stand and which are pivotable against spring force out of an open position into a holding position, their pivoting planes intersecting approximately in the axis of symmetry, and at least one flexible force transfer element, particularly a steel cable, which can be actuated by means of a tensioning device and which can be loaded in tension and which engages around the holding elements and which, when tightened, causes the holding elements to pivot towards the axis of symmetry into the holding position.

Abstract: A method and an apparatus are described for positioning and fixing beams, in particular made from wood, in particular for the construction of ground foundations, by means of at least one ground dowel. The ground dowel receives, in a retaining part, a ground dowel insert part which can be fixed therein and which possesses a retaining means, attached to a baseplate, for determining the position of the beam relative to the ground dowel insert part, the ground dowel insert part being fixed at least adhesively on the pressed-on beam. After the ground dowel, placed at the desired position and provided with the ground dowel insert part, has been adjusted to the desired height, the beam is pressed on to the retaining means in the desired position. The ground dowel insert part is fixed on the removed beam in accordance with the position determined by the retaining means, and the beam thus positioned, with the ground dowel insert part fixed thereon, is inserted into the retaining section of the ground dowel.

Abstract: A prestressed resilient device including a spring (1) and a prestressing cage (2) having a variable axial length up to a maximum length (LO) and being inserted inside the spring (1). The cage (2) includes two U-shaped distance pieces (3, 4) that are coupled through their bases that keep the ends (11, 12) of the spring at a maximum distance apart while enabling them to draw nearer to each other.

Abstract: The invention relates to a stand for holding bar-like components (2), especially on Christmas trees, having a socket element (3) and a clamping and holding system (4), a centering system (8) being provided for centering the bar-like component (2), having at least one flexible element (9), which reaches radially into a socket opening (10) of the socket element (3) so that a centering action with respect to a center point of the stand is produced on the bar-like component (2) when introduced into the socket element (3).

Abstract: The invention relates to a stand for clamping rod-shaped parts, in particular Christmas trees. The stand has a tensioning device and a holding device with a number of holding elements which can be pivoted from a holding position into a release position and are prestressed in the release position by respective springs. At least one force transmission element is provided, which is guided on the holding elements and can be tensioned by means of the tensioning device. The holding elements and/or the force transmission element are/is, at least in a region in which the force transmission element is guided on the holding elements, designed in such a manner that, when relative movement takes place between the holding elements and the force transmission element, the latter slides with reduced friction on the holding elements. The springs are integrated in the respective holding elements, and the holding elements consist of a slidable plastic.