Individually protected strand, and its manufacturing process
AssigneeFreyssinet International (STUP)
InventorsJérôme Stubler, Manuel Peltier, Jean-Claude Percheron
Life of this patent
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Abstract
The strand comprises a group of twisted metal wires, a plastic sheath and a pliant filling compound which fills internal interstices between the twisted wires of the group and a peripheral interstice lying between the periphery of the group and the inner face of the sheath. This peripheral interstice has, in a cross section of the strand, an area of between P×emin and 0.6×S2, where P is the external perimeter of the group of wires, emin=0.05 mm and S2 is the cumulative area of the gaps lying between the periphery of the group and the smallest circle within which the group is inscribed.
Claims5
Strand comprising a group of twisted metal wires, a plastic sheath containing said group, and a pliant filling compound filling internal interstices lying between the twisted wires of the group and a peripheral interstice lying between a periphery of the group and an inner face of the sheath, wherein said peripheral interstice has, in a cross section of the strand, an area of between P×emin and 0.6×S2, where P is an external perimeter of the group of wires, emin=0.05 mm and S2 is a cumulative area of a plurality gaps lying between the periphery of the group and the smallest circle within which the group is inscribed.
Process for manufacturing a strand, comprising the steps of:
- coating a group of twisted metal wires with a pliant filling compound so that said compound fills internal interstices lying between the twisted wires of the group and protrudes at a periphery of the group;
- wiping the periphery of the coated group so as to leave a regulated amount of filling compound per unit length of the group, said amount representing a volume per unit length of between S1+(P×emin) and S1+(0.6×S2), where S1 is a cumulative area of said internal interstices on a cross section of the strand, P is an external perimeter of the group of twisted wires, emin=0.05 mm and S2 is a cumulative area of a plurality of gaps lying between the periphery of the group and the smallest circle within which the group is inscribed;
- extruding a plastic sheath around the group of wires coated with said amount of filling compound.
Dependencies are inferred from the claim text.