b' A series of complex and bespoke crane lifting plans to facilitate thesafe demolition and removal of the existing girders, as well as theinstallation of the new precast elements. In each instance, this was done using a 250t mobile crane;Coordination of specialist overhead wiring crews to safely detach, handle and protect the existing OHW infrastructure during demolition, before refitting and commissioning the newly installed structural elements; Pier top remediation and bearing installation/ replacement works ahead of the new precast concrete elements being installed into position. This involved critical survey and set-out, along with theuse of specialist fast-curing repair materials; Make-good of the existing infrastructure whichinterfaced with thenewly installed sections of bridge, such as reinstallation of earthingProviding asphalt solutions for the and bonding, anti-throw screens and pedestrian footpaths.long-term durability of the bridge Safe positioning of cranes for lifting ofAs a further means of overcoming corrosion attack to key bridge spans and pre-cast concreteparts, the design made provision for a new sealed road surface so Site limitations included existing rail signaling infrastructure, livethat the underside of the roadway was less susceptible to water overhead electrical services and unfavorable environmental/ingress. ground conditions. This made the positioning of a suitably sizedThis work was executed while maintaining vehicular access across mobile crane within the rail corridor unfeasible .the busy thoroughfare. This involved establishing contraflow Brefni proposed a unique alteration to the original scope, utilising thetraffic management conditions over a series bridge itself for crane set-up. This solution ensured a far saferof consecutive night shifts and coordinating the timing of various approach for the employment of heavy machinery, while alsospecialist trades for the installation of the asphalt, white lines and reducing planned rail possession programming from four linebridge joint seals. outages to two.Working with the client for best for project This solution required significant input and planning from theoutcomes during bearing replacement structural design and lift plan engineers, as well as third-partyWorks could only be undertaken on specific bearing pairs at any permissions in order to close the bridge. This solution therefore notone time, to ensure the integrity of the structure and ensure that only provided an innovative and far safer approach to thethe bridge was never physically lifted by the propping/jacking utilisation of heavy machinery including cranes, but resultingarrangement. client benefits included reduced rail downtime and reducedBrefni developed a temporary works methodology, in close impact for passenger and freight rail services and reducedconsultation with a specialist temporary works designer, with project costs.each load-transfer exercise being monitored and supervised by a qualified engineer. While undertaking the works, we also identified an unknown void within the bridge construction. Undertaking further investigation, Brefni championed and proposed a best-for-project process to Brefni was able to not only advise the client of this component andthe asset owner and design engineer. We uncovered significant effectively address it in an updated methodology but eliminatedsection loss to the main girder webs which required additional falls risks for crews in the subsequent construction works.strengthening plate works. We also proposed a further review and condition assessment of the Pier 5 bearings, leading to a reduced scope and alternative/simplified repair detail at these roadway locations. This in turn reduced downtime and subsequent disruption to all rail users, as well as reducing overall project costs realised by Sydney Trains. BREFNI|12'