A process for manufacturing pre-stressed concrete members

B - Operations – Transporting – 28 – B

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B28B 23/04 (2006.01) E04C 5/07 (2006.01) E04C 5/08 (2006.01)

Patent

CA 2446711

According to a post-tension process, carbon fiber bundles 13a, 13b, which extend from a straight carbon fiber cable 10, are folded and inserted in a sheath 21. U-shaped carbon fiber anchors 33 (burial anchors) are bonded to the folded part of the carbon fiber bundles 13a, 13b. After green concrete is aged to a hardened concrete body 23, the straight carbon fiber cable 10 is stretched by pulling tentative anchors 40a, 40b, and grout 22 is poured in the sheath 21. After the grout 22 is hardened, the straight carbon fiber cable 10 is released from tension by cutting off the tentative anchors 40a, 40b. Consequently, a concrete member 20 is pre-stressed due to shrinkage of the straight carbon fiber cable 10. According to a pretension process, a carbon fiber hoop is wound on and bonded to a plurality of straight carbon fiber cables, which are arranged parallel to each other. Green concrete is poured in a molding box under the condition that the straight carbon fiber cable are stretched. After the concrete is hardened, the straight carbon fiber cables are released from tension. In any process, the straight carbon fiber cable 10 is held in a loose-free state and provided with carbon fiber anchors instead of conventional steel anchors. As a result, a pre-stressed concrete member excellent in mechanical strength, fatigue properties and corrosion-resistance is manufactured at a low cost.

jp024780ion concerne un procédé de fabrication de béton précontraint, qui consiste à faire passer des faisceaux de fibres (13a, 13b) s'étendant à partir de câbles (10) parallèles de fibres de carbone dans une gaine (21) par pliage, à installer des points d'ancrage (33) en fibre de carbone en U (point d'ancrage lisse), à fixer les faisceaux de fibres à l'aide d'un adhésif (12) durcissant à température ambiante. Une fois le béton (23) placé durci, on étire les câbles (10) parallèles de fibres de carbone à travers des points d'ancrage provisoires (40a, 40b). Le coulis versé dans la gaine (21) est durci. On libère une force d'étirage en séparant les points d'ancrage provisoires (40a, 40b) afin que la force de contraction des câbles (10) parallèles de fibres de carbone agisse sur l'élément de béton précontraint (20) et, dans le cas où on utilise un système de mise en tension, on fixe de manière adhésive plusieurs renforts principaux sur lesquels est disposée la pluralité de câbles (10) parallèles de fibres de carbone, parallèles jp024795aux autres et enroulés à l'aide de cerclages de fibres de carbone. On verse le béton tout en étirant les renforts principaux, et on libère la force d'étirage une fois le béton mis en place (23) durci. Ainsi, un élément en béton précontraint offrant des caractéristiques mécaniques, une résistance à la fatigue et une résistance à la corrosion excellentes peut être fabriqué à moindre coût au moyen de câbles (10) de fibres de carbone parallèles moins friables utilisés comme matériaux d'étirage et ne nécessitant pas de points d'ancrage en acier.

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