Prestressing anchorage system for fiber reinforced plastic...

E - Fixed Constructions – 04 – C

Patent

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Details

E04C 5/12 (2006.01) E04C 5/07 (2006.01) E04C 5/20 (2006.01) E04G 23/02 (2006.01)

Patent

CA 2221885

An anchorage for a tendon that includes a sleeve having a smooth tapered interior bore and a compressible wedge disposed in the sleeve. The compressible wedge has a smooth exterior tapered surface tapering from a wider end to a narrower end and one or more interior channels for receiving a tendon. The taper angle of the compressible wedge is greater than the taper angle of the bore. Thus, upon insertion of the compressible wedge into the sleeve, the wider end of the compressible wedge forms a wedge contact with the sleeve before the narrower end forms a wedge contact with the sleeve. Preferably, the bore and wedge are conical, and the wedge is formed of several symmetrical pie shaped resilient sections. Corners of the sections abutting at the interior channel are rounded. An inner sleeve is disposed in the interior channel, with the outer diameter of the inner sleeve matching the diameter of the interior channel. The tendon is held by the inner sleeve. A pre-stressed structure may be formed by anchorages at each end of a structure with a tendon in tension between them.

Cette invention concerne une pièce d'ancrage de câble de précontrainte formée d'un manchon à alésage intérieur conique lisse et d'un coin compressible à disposer dans ledit manchon. Le coin compressible de section conique présente une surface extérieure lisse et comporte un ou plusieurs canaux intérieurs destinées à recevoir un câble de précontrainte. Le coin compressible est plus effilé que l'alésage conique du manchon. Ainsi, à l'insertion du coin dans le manchon, les bouts évasés du coin et du manchon se touchent avant que ne se touchent leurs pointes. De préférence, le coin et l'alésage du manchon sont coniques et le coin est formé d'une série de sections symétriques souples en forme de triangle. Les angles des sections qui délimitent le canal intérieur susmentionné sont arrondis. Un manchon intérieur est disposé dans ce canal, le diamètre extérieur du manchon intérieur étant égal au diamètre du canal intérieur. Le câble de précontrainte est maintenu en place par le manchon intérieur. Cet assemblage permet de former une structure précontrainte par la mise en tension d'un câbles entre deux pièces d'ancrage.

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