When it was asked to take part in the modernisation
of the ANZAC Bridge in Sydney, Australia, Freyssinet had to develop some
new solutions. In order to reduce vibrations due to wind and rain, Freyssinet
retrofitted helical ribs onto the existing HDPE sheaths using a welding
robot, without any interruption to traffic. Freyssinet dampers (IRDs),
which absorb the residual vibrations, were also installed. A method for
replacing the filler was specially devised in order to strengthen the stay
cable anchors. At the same time, the decision was taken to improve the
permanent access systems, leading to the installation of a lift in each
tower and access to all of the bridge's deck-level anchors.
ANZAC Bridge (Australia) |