Method and reel device for threading tendons into ducts

摘要

A method is described for threading a tendon into a duct from an opening at an intermediate point along the length of the duct. Opposite ends of the tendon are threaded from a reel into the two halves of the duct. The tendon is wound on to the reel such that both ends of the tendon can be unwound into the duct simultaneously. A reel and a method for winding the tendon on to the reel 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.

主权项

1. Method of threading a tendon into a duct,
the tendon having an intermediate tendon length portion at a predetermined intermediate location along the length of the tendon between the first and second ends of the tendon, the tendon thereby comprising a first tendon length portion, being the portion of the tendon between the intermediate tendon length portion and the first end of the tendon, and a second tendon length portion, being the portion of the tendon between the intermediate tendon length portion and the second end of the tendon, the duct having an intermediate duct length portion at a predetermined intermediate location along the length of the duct between the first and second ends of the duct, the duct thereby comprising a first duct length portion, being the portion of the duct between the intermediate duct length portion and the first end of the duct, and a second length portion, being the portion of the duct between the intermediate duct length portion and the second end of the duct, the method being characterised by a first step of providing the duct with an opening in the intermediate duct length portion, a second step of feeding the first tendon length portion through the opening into the first duct length portion, and a third step of feeding the second tendon length portion through the opening into the second duct length portion.