THE removal of the launch nose – the steel section in the front section of Mandurah’s new traffic bridge – started today and drew a crowd of bystanders.
Mandurah Terrace will be closed between Pinjarra Road and Tuckey Street for five days so the nose can be dismantled and removed from the site.
The bridge is being built using the “incremental” launch system in which it has been put together in individual concrete segments on the western foreshore and extended section by section to the eastern foreshore.
A casting bed was built on the western foreshore and the concrete for each segment poured into the casting bed framework to create each section.
As the bridge extended across the estuary, the launch nose at the front rested on each of the piers in turn.
The piers provide the supporting base for the new bridge.
Each pier consists of piles driven into the riverbed on which a concrete pile cap is constructed.
Two columns on top of the pile cap provide the support for the bridge deck.
The bridge is now two thirds completed and expected to be in use by traffic by the end of the year.
Work will then start on the old bridge, which will take about three months to demolish.
Mandurah Terrace will be closed for a further day next month to install fencing and road layout changes and for four weeks in July-August to connect the new bridge to the existing road network.