Process and apparatus for placing parallel wire strands in cable-stayed bridges

摘要

In order to mount a multistrand stay cable of a cable-stayed bridge between a pillar (tower) and the deck of this bridge, one of the strands (41) intended to constitute the stay cable is fitted in its final oblique position; a guide cage is suspended from this first strand thus fitted, which cage consists of a sequence of rigid bow struts (stirrup pieces) (5) connected together by small cables (6), the said cage surrounding the said first strand as well as a traction cable (9); using the said cable, the following strands (4) are pulled in succession into the cage; at the end of the traction of each strand, it is tensioned so as to apply it laterally against the strands already fitted, and its ends are anchored, respectively on the pillar and on the deck; and all of the strands have been fitted, the guide cage is released from the finished stay cable. IMAGE