US 5,082,614 AGranted

Method for producing a composite pipe in a rotating drum

AssigneePeter Hartmann Beteiligungen AG

InventorsPeter Hartmann, Bernhard Bergmann

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Abstract

The components forming the layers of a composite pipe are successively introduced into a rotary drum (1). Initially, a plastic reinforcing lyaer (8), including a fiber reinforcement, is introduced into the drum, the ends of the drum (1) being bounded by rings. A concrete core layer (16) is then introduced and the length of the core layer (16) is shortened relative to that of the drum (1) by shaping rings fixed to the drum ends. The shaping rings are then replaced by other shaping rings (20, 21) so that, on either side of the core layer (16), two annular spaces (22, 23) are formed which are filled by a socket material (24, 25) of the same composite as the reinforcing layer (8). Thus, at one pipe end a socket end (28) is formed and at the other pipe end a spigot end (30) is formed, each such end being located within the composite pipe wall thickness. After introducing a second reinforcing layer (26), the production of the composite pipe is completed. By producing the socket connecting elements (28, 30) simultaneously with the construction of the composite pipe, a reliable and rational production of the composite pipe with its socket connecting elements (28, 30) is achieved. By shaping a shoulder (33) on the spigot end (30), when sliding together two composite pipes, the socket end (28) is centered. Simultaneously, an annular space (34) is formed, in which can be inserted an elastic seal (35) for drip-tight sealing.

Claims3

Dependent claims

A method for producing a composite pipe built up by layering core and reinforcing material layers in a rotating drum, said pipe including socket connecting elements on respective outer and inner walls at the ends of said pipe, said socket connecting elements including a plastic reinforcing layer having a fibre reinforcement material, and said pipe having an interposed core layer of inorganic material having a binder between said socket connecting elements, said method comprising the steps of:

forming said outer wall of reinforcing layer material initially introduced into said drum, the ends of said drum being bounded by rings each provided with a terminating surface;
fixing first and second shaping rings to said ends of said drum and introducing a core layer material on to said reinforcing layer material, such that said shaping rings limit said core layer to a length smaller than the drum length;
fixing third and fourth shaping rings to said drum ends, for shaping said socket connecting elements, and providing hollow annular spaces between the ends of said core layer and said third and fourth shaping rings and filling said annular spaces with the socket material, prior to an application of an inner wall reinforcing layer thereby forming one said pipe end with a socket end having a projection, and forming another said pipe end with a spigot end having an offset, and
wherein said material used to shape said socket and spigot pipe ends corresponds to said material of said reinforcing layer of said pipe.

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Dependencies are inferred from the claim text.