Method and mould for producing concrete pipes having a plastic inner pipe

A method for producing a concrete pipe which comprises a basic body made of concrete and a plastic inner pipe and which is intended for conducting a liquid, the method comprising:

• introducing a mould core into the plastic inner pipe;
• introducing the plastic inner pipe into an outer mould;
• and
• pouring concrete, in particular self-compacting concrete, into an intermediate space between the outer mould and the plastic inner pipe to form the basic body made of concrete, wherein 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 after the concrete has at least partially solidified, and wherein the plastic inner pipe comprises an inner section and, at both ends, respective widened sections which have a larger cross section than the inner section;
• wherein the mould core is adapted to the shape of the plastic inner pipe in such a way that an inner section of the mould core substantially has a cross section corresponding to the cross section of the inner section of the plastic inner pipe, a first outer section of the mould core substantially has a cross section corresponding to the cross section of the first widened section at one end of the plastic inner pipe and a second outer section of the mould core substantially has a cross section corresponding to the cross section of the second widened section at the other end of the plastic inner pipe, and
• wherein the mould core is formed in at least two parts and a first mould core part of the at least two-part mould core comprises the first outer section and a second mould core part of the at least two-part mould core comprises the second outer section.

A mould for producing a concrete pipe comprising a basic body made of concrete and a plastic inner pipe and which is intended for conducting a liquid, the mould comprising:

• an outer mould;
• and
• a mould core designed to be introduced into a plastic inner pipe;
• wherein the mould core is adapted to the shape of the plastic inner pipe in such a way that an inner section of the mould core substantially has a cross section corresponding to the cross section of the inner section of the plastic inner pipe, a first outer section of the mould core substantially has a cross section corresponding to the cross section of the first widened section at one end of the plastic inner pipe and a second outer section of the mould core substantially has a cross section corresponding to the cross section of the second widened section at the other end of the plastic inner pipe, and
• wherein the mould core is formed in at least two parts and a first mould core part of the at least two-part mould core comprises the first outer section and a second mould core part of the at least two-part mould core comprises the second outer section.