Method and reel device for threading tendons into ducts

摘要

A method is described for threading a tendon (2) into a duct (4) from an opening at an intermediate point along the length of the duct (4). Opposite ends (2a, 2b) of the tendon (2) are threaded from a reel (6) into the two halves (4a, 4b) of the duct (4). The tendon (2) is wound on to the reel (6) such that both ends (2a, 2b) of the tendon (2) can be unwound into the duct (4) simultaneously. A reel (6) and a method for winding the tendon (2) on to the reel (6) are also claimed. The method and reel are particularly suitable for threading coated steel tendons into PT ducts in tall structures such as containment vessels.