Abstract: A system for the molding of tubular goods, comprising at least one mold having an inner mold part and an outer mold part which together define a mold cavity and an upwardly open annular pouring gate, the system additionally comprising a plurality of vibrators and devices for lifting the vibrators from and lowering these into the mold cavity through the annular pouring gate. The positioning devices are adapted to displace the vibrators radially with respect to the annular pouring gate, and each of the positioning devices is provided with a separate controllable drive unit which is adapted to displace the vibrators individually. This results in a more flexible system for the molding of tubular goods which may be adapted to various pipe types, such as egg-shaped, four-sided, circular and other forms.

Abstract: A production system for automatically casting hollow bodies, in particular of concrete, in a casting mold, which comprises an inner mold (2), an outer mold (1), a bottom ring (3), and a top ring (4). Separate top rings (4) are used for the production, which remain on the top end of the pipe until the concrete has set sufficiently, to ensure that the shape and tolerances of the top end of the pipe are retained after casting. The system moreover includes a clamping chuck (15) for retaining the top ring during casting. The clamping chuck is equipped with a clamping device that includes a ring-shaped flexible hose and a slotted spring ring. When the hose is filled with compressed air from a compressed air source, it clamps the spring ring together around a gripping ring on the top ring.