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US 2006/0033227 A1Published application
Method and an apparatus for the manufacture of concrete pipes
AssigneePedershaab Concrete Technologies A/S
InventorMorten Norgaard
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AssigneePedershaab Concrete Technologies A/S
InventorMorten Norgaard
Estimating the term…
A method and an apparatus for the manufacture of concrete pipes (2) made of an outer layer and having an inner layer of greater density in surface structure is described. The inner layer is applied by an applicator in a mould (1) having both outer (3) and inner (4) mould parts. The applicator is formed by an inner mould part or core (4) or by an applicator unit in immediate connection with the core (4). The applicator applies the inner layer simultaneously or immediately following vibration of the concrete forming the pipe. The inner layer is applied during movement of the inner mould part or core (4) in its longitudinal direction, the core having one or more supply openings (14) provided along the circumference of the core (4) at the upper end of the core (4) for supplying a further material of greater density to form the inner layer.
A method for the manufacture of concrete pipes comprising an outer layer, said outer layer forming the pipe itself, as well as an inner layer of greater density in surface structure, said inner layer being supplied by an applicator in a mould comprising inner as well as outer mould parts, characterized in that the applicator is formed by an inner mould part or core (4) or by an applicator unit in direct connection with the core, said applicator supplying the inner layer during simultaneous or during immediately following vibration.
Dependencies are inferred from the claim text.