Post-stressing of reinforced concrete structures

Claim 1

An assembly for use in post-stressing the strands of a cablereinforced concrete structure, in which an anchor head is employed having a separate aperture therethrough to pass each strand, each aperture being flared towards its outer face and having a segmented and tapered strand grip in registration therewith, comprising: a bearing stool constructed to and arranged to circumscribe the anchor head at least partially and to receive a centre-hole jack thereon; a first template locatable in the bearing stool parallel to the outer face of the anchor head and freely movable normally therefrom, the template having a plurality of apertures alignable with the apertures in the anchor head; and a drift wedge locatable, in the bearing stool on that side of the first template remote from the Anchor head and substantially parallel thereto, (1) to limit movement of the first template normally away from the anchor head to maintain loose registration of the grips in their associated apertures but out of substantial frictional contact with the strands and (2) on lateral movement of the drift wedge into the bearing stool to move the first template towards the outer face of the anchor head to urge each grip into seating engagement with its associated aperture and into full frictional contact with the strands.