Method for manufacturing an individually sheathed strand, strand thus obtained and strand manufacturing installation
AssigneeSoletanche Freyssinet
InventorsNicolas Fabry, Ivica Zivanovic
Life of this patent
Estimating the term…
Abstract
The method for manufacturing an individually sheathed strand comprises: conveying a group of metal wires through a die; upstream of the die, applying a first filler product to at least a first portion of the strand; upstream of the die, applying a second filler product to at least a second portion of the strand distinct from the first portion; and extruding a plastic around the group of metal wires passing through the die, so as to envelop the group of metal wires covered with the first and second filler products in a continuous sheath formed of the extruded plastic. The second filler product has greater adhesion to the group of metal wires than the first filler product.
Claims22
A method for manufacturing an individually sheathed strand, the method comprising:
- conveying a group of metal wires through a die;
- upstream of the die, applying a first filler product to a first portion of the strand, the first filler product filling the interstices between the metal wires and surrounding the metal wires in the first portion of the strand;
- upstream of the die, applying a second filler product to a second portion of the strand distinct from the first portion, the second filler product being distinct from the first filler product, the second filler product filling the interstices between the metal wires and surrounding the metal wires in the second portion of the strand, the second portion of the strand being void of first filler product and the first portion of the strand being void of second filler product, the first and second portions extending in succession along the strand, the second filler product having greater adhesion to the group of metal wires than the first filler product;
- and
- extruding a plastic material around the group of metal wires passing through the die, so as to envelop the group of metal wires coated with the first and second filler products in a continuous sheath formed of the extruded plastic material, the continuous sheath having a constant exterior section, wherein in the first portion of the strand, the continuous sheath surrounds exclusively the group of metal wires and the first filler product, and wherein in the second portion of the strand, the continuous sheath surrounds exclusively the group of metal wires and the second filler product, the second filler product having a greater adhesion to the continuous sheath than the first filler product.
An individually sheathed strand, comprising:
- a group of metal wires;
- a first filler product filling the interstices between the metal wires and surrounding the metal wires in a first portion of the strand;
- a second filler product, distinct from the first filler product and filling the interstices between the metal wires and surrounding the metal wires in a second portion of the strand distinct from the first portion of the strand, the second portion of the strand being void of first filler product and the first portion of the strand being void of second filler product;
- and
- a sheath of extruded plastic material extending continuously and of constant exterior section, wherein in the first portion of the strand, the sheath surrounds the group of metal wires and the first filler product, and wherein in the second portion of the strand, the sheath surrounds the group of metal wires and the second filler product,
- the second filler product adhering both to the metal wires and to the internal surface of the sheath, the first and second portions extending in succession along the strand, the second filler product having a greater adhesion to the group of metal wires and the sheath than the first filler product.
Dependencies are inferred from the claim text.