Abstract: Embodiments of a method and a mold for producing a concrete pipe comprising a basic body made of concrete and a plastic inner pipe for conducting a liquid. The method comprises introducing a mold core into the plastic inner pipe, introducing the plastic inner pipe into an outer mold and pouring concrete into an intermediate space between the outer mold and the plastic inner pipe to form the basic body. After the concrete has solidified, the plastic inner pipe remains as inner formwork in the basic body made of concrete and the mold core is removed.

Abstract: A method and system for producing tubular concrete products in a casting method using upright casting molds. The system includes a fabrication zone with a plurality of fully automated fabrication stations and a mold conveyor, the first zone having: a first demolding station for removing an outer mold from a casting mold positioned at the first demolding station, a second demolding station for removing a cured tubular concrete product form a mold core positioned at the second demolding station, a mold core cleaning station for cleaning a mold core positioned at the mold core cleaning station, an outer mold cleaning station for cleaning an outer mold positioned at the outer mold cleaning station, a mold assembly station for assembling a casting mold from an outer mold and a mold core, and at least one filling station for filling an assembled casting mold with concrete.

Abstract: A method and system for producing tubular concrete products in a casting method using upright casting molds. The system includes a fabrication zone with a plurality of fully automated fabrication stations and a mold conveyor, the first zone having: a first demolding station for removing an outer mold from a casting mold positioned at the first demolding station, a second demolding station for removing a cured tubular concrete product form a mold core positioned at the second demolding station, a mold core cleaning station for cleaning a mold core positioned at the mold core cleaning station, an outer mold cleaning station for cleaning an outer mold positioned at the outer mold cleaning station, a mold assembly station for assembling a casting mold from an outer mold and a mold core, and at least one filling station for filling an assembled casting mold with concrete.

Abstract: An apparatus for welding a tubular lining of a wastewater pipe includes a retainer for the butt-jointed longitudinal edges, which are to be welded, of a plastic panel bent to form a pipe, and a welding apparatus. The retainer includes one respective clamping device for each edge formed by a stationary clamping bar on the outside of the pipe and a movable clamping bar on the inside of the pipe which is connected to an actuating drive. The stationary clamping bars are located opposite of one another with respect to the butt joint between the two longitudinal edges while leaving a gap open. At least one of the two movable clamping bars forms a stop for one longitudinal edge of the plastic panel in a position placed against the associated stationary clamping bar. A guide is provided along the gap between the stationary clamping bars for the welding device.

Abstract: The invention describes an apparatus for welding a tubular lining of a wastewater pipe, comprising a retainer for the butt-jointed longitudinal edges (8, 9), which are intended to be welded, of a plastic panel (5) bent to form a pipe, and comprising a welding apparatus (25).

Abstract: Embodiments of a method and a mould for producing a concrete pipe comprising a basic body made of concrete and a plastic inner pipe for conducting a liquid. The method comprises introducing a mould core into the plastic inner pipe, introducing the plastic inner pipe into an outer mould and pouring concrete into an intermediate space between the outer mould and the plastic inner pipe to form the basic body. After the concrete has solidified, the plastic inner pipe remains as inner formwork in the basic body made of concrete and the mould core is removed.

Abstract: In order to save material and/or for an easy assembly in a mould bottom of a bottom mould, a moulded piece forming a negative mould of at least a part of a chute of a shaft bottom which moulded piece is formed from a material forming a dead core and, optionally being assembled with at least one further moulded piece, forms the negative mould of a chute of a shaft bottom in the form of a moulded body, wherein the moulded piece(s) is (are) designed for being placed onto a mould bottom of a bottom mould for a shaft bottom and has (have) linear and/or an arcuate longitudinal extension, is characterized in that the moulded piece has at least one hollow space open toward the base which can be placed onto the mould bottom of the bottom mould and is designed as basically closed on the end faces lying opposite each other in the longitudinal extension of the moulded piece.

Abstract: A device is described for applying a release agent to a molding ring (1) for a front centering shoulder of a tubular or annular workpiece made of concrete having an application unit connected to a pump for the release agent. To provide advantageous application conditions, it is suggested that the application unit for the release agent have an application roll (4) preferably adapted to the profile of the molding ring (1), whose rotational axis (5) at least approximately runs in a diameter plane of the molding ring (1).

Abstract: An apparatus is described for machining on the face side a negative mold for a profile element (1) which is made of thermoplastic foamed material, forms the branch of a channel of a shaft floor and can be applied in an interlocking manner to a profile strand for the main channel, comprising a table (3) for receiving the profile element (1) to be machined and with a support (5) which is movable along a predetermined planar path for a curved heating wire (4) extending in one plane along the profile.

Abstract: A device for processing the contact surface of a mold profile has a table for receiving the mold profile and a heating wire running in accordance with the cross-sectional profile of the contact surface to be produced, which is movable in relation to the table along the contact surface. The mold profile is rotatable around the receptacle axis coaxially to the table receiving the contact surface in relation to the heating wire, which, originating from the receptacle axis, runs diagonally in relation to the receptacle axis at an angle corresponding to the conical contact surface to be processed, and the table has a passage for the heating wire to be inserted into the processing allowance of the mold profile in relation to the table in the direction of the receptacle axis.

Abstract: A device is described for applying a release agent to a molding ring (1) for a front centering shoulder of a tubular or annular workpiece made of concrete having an application unit connected to a pump for the release agent. To provide advantageous application conditions, it is suggested that the application unit for the release agent have an application roll (4) preferably adapted to the profile of the molding ring (1), whose rotational axis (5) at least approximately runs in a diameter plane of the molding ring (1).

Abstract: An apparatus for pulling a molding ring off a neck of a concrete tubular workpiece formed by the molding ring comprises two clamping jaws positioned diametrically opposite each other with respect to a vertical axis of the tubular workpiece, the clamping jaws overlapping the molding ring from above and engaging the workpiece below the molding ring. A supporting structure displaceably supports the clamping jaws, and a lifting device is arranged on the supporting structure for two pull-off catches arranged diametrically opposite each other with respect to the molding ring, the pull-off catches subtending an undercut of the molding ring. According to the invention, carriages are provided for the clamping jaws and pull-off catches, the carriages being adjustable in opposite directions along coaxial guides.

Abstract: An apparatus for the production of ring-shaped bodies of concrete, such as pit linings, pipes or the like. The apparatus includes a liftable and lowerable exterior mold, a mold space radially limiting the mold core toward the inside, at least one shaking device for introducing vibrations into the filled-in concrete, a bottom faucet closing the mold space at the bottom for shaping the lower centering end of the ring-shaped body, an upper mold faucet for shaping the upper centering end of the ring-shaped body. The apparatus also comprises an upper ring-shaped collar and a liftable and lowerable, rotatable pressure head and includes a coupling device which is provided with at least two clamping units distributed on the circumference of the pressure head, the motor-operated clamping jaws of said clamping units engaging the ring-shaped collar of the mold faucet.

Abstract: An installation is described for hardening tubular concrete workpieces (1) in chambers (2) which are open at the top, can be closed with cover plates (3) and can be subjected to vapor and which can be charged with the aid of an overhead travelling crane (6) bearing a hoist (9) for workpieces (1). In order to achieve an advantageous construction constellation it is recommended that the overhead travelling crane (6) for the workpieces (1) has a gripping device for the cover plates (3) of the chambers (2).