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Anchorages are used to fix the ends of the tendons in post-tensioning systems. Various designs are available, depending on the system supplier, but basically they are steel blocks through which single or multiple strands pass and are anchored by wedges. The strands may be tensioned individually or as a group.
The anchorages are cast into the concrete and transfer the entire load from the strands into the concrete. This causes high local bursting forces. To prevent the concrete splitting additional reinforcement is required close to the anchorage.
Where high tensile strength bars used for prestressing, the bars are threaded (either just at the ends or over their whole length) and anchored after tensioning by means of nuts that bear against steel plates set in the concrete. Again addition reinforcement is needed to prevent bursting of the concrete.
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Live VSL type S 6-1 PLUS/Si 6-1 PLUS anchorage, embedded VSL type SF 6-1 PLUS anchorage
It is a very economical system with enhanced corrosion protection. A plastic coat covers the external faces of the anchorage casing in continuity of the plastic sleeve. Anchorages can be used for anchoring single unbonded strands (S 6-1 PLUS) or single bonded strands (Si 6-1 PLUS). The prestressing force is transmitted through wedges to a one-flange cast-iron anchor and then further to the structure. The wedges are protected with plastic grease and equipped with a cap for the unbonded system to provide a watertight seal, the anchorage system certainly solves also the corrosion protection of the point where the strand accesses the anchor. The anchorage is either live, type S 6-1 PLUS/Si 6-1 PLUS, or embedded, non-stressed SF 6-1 PLUS anchorage.
Live VSL type S 6-1/Si 6-1 anchorage, embedded VSL type SF 6-1 anchorage, SK 6-1 coupler
This type of anchorage is designed for anchoring single unbonded strands (S 6-1) or single bonded strands (Si 6-1). The prestressing force is transmitted through wedges to a two-flange cast-iron anchor and then further to the structure. The wedges are protected with plastic grease and equipped with a cap for the unbonded system to provide a watertight seal, the anchorage system certainly solves also the corrosion protection of the point where the strand accesses the anchor. The anchorage is either live, type S 6-1/Si 6-1, or embedded, non-stressed SF 6-1 anchorage. Single strands in the structure can be connected using the SK 6-1 coupler. New strand is connected once the previous strand is stressed.
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