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[quote user="Euclid"]How is the tensioning performed? I am guessing that they use a very sophisticated hydraulic puller that shows the exact amount of pulling force applied to each cable. [/quote] Here is a press for a stranded prestressing tendon: <a href="http://www.paul.eu/fileadmin/_migrated/pics/buendelsp_3.jpg">http://www.paul.eu/fileadmin/_migrated/pics/buendelsp_3.jpg</a> Each strand is clamped with wedges: <a href="https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/Stressing_anchorage.jpg/360px-Stressing_anchorage.jpg">https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/Stressing_anchorage.jpg/360px-Stressing_anchorage.jpg</a> The cable is stressed more than needed, the wedges inserted, and the cable released until the cable is clamped. The whole procedure is controlled by measuring the lengthening of the cable and the power of the press (manometer) Pre-tensioning bars with thread are anchored with special nuts: <a href="http://civilengineeringbible.com/imgs/contents/201801/959_lee%20mcCall%20system.png">http://civilengineeringbible.com/imgs/contents/201801/959_lee%20mcCall%20system.png</a> [quote user="Euclid"]How can they reduce tensioning on the cable if necessary?[/quote] When you know you have to reduce the tensining you leave the strands or bars long enough. Than you can place the press again to pull the cable/bar until the anchoring can be removed and than release the press to the predetermined length and anchor again or release completely. Regards, Volker
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