Page 38 - Wire Rope News & Sling Technology - June 2019
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         continued from page 36             materials required for a tunnels proj-
         the client would have to excavate around   ect  of  such  magnitude.  Dialogue  was
         the box and fill in with groundworks to   opened in  April  2016,  and  a  craneage
         specific  bearing  pressures.  The  costs   methodology developed in consultation
         were excessive and would have had a   with the client to suit their preferred
         major impact on the program. Further-  construction  methodology.  The  first
         more, using the crawlers would still have   crane was erected a year later and the
         been a limited solution.”          job completed in October 2018.
           He added, “The project will serve as   Marr Contracting have leveraged the
         a blueprint for future mega projects as   success of the NRT project to present the
         decision makers recognize the benefits   benefits of combining fewer cranes with
         of decongested sites. Our approach, not   greater efficiency on similar scale sites,
         only with NRT but other clients also, is   including the new Sydney Metro City
         to use less cranes, but the right cranes   and Southwest Stage where they have
         to achieve greater efficiencies. For ex-  been  awarded  multiple  stations  using
         ample, our solution facilitated lifting of   this same new technology. A number
         loads from outside the project’s bound-  of global projects have adopted the cut-
         aries,  which  further  decluttered the   and-cover  box  method,  where  crawler
         site and led to additional time and eco-  cranes are nearly always the immediate
         nomic savings – not to mention a safer   consideration. However, the installation
         work environment.”                 of the right tower cranes can change the
           The cranes provided were both the   way the entire project is constructed,
         result of design collaboration between   principally because of the ability to lift
         Marr and manufacturer Favelle Favco:   bigger pieces, reduce land, and remove
         a 330t capacity M2480D with 90m boom   the requirement for costly, challenging,
         and a 200t capacity M1680D with 62m   and time-consuming groundworks.
         boom. They lifted a variety of loads, in-  Simon Marr said, “Using fewer,
         cluding  pre-cast beams, columns  and   higher capacity cranes also reduces the
         panels weighing up to 60t; in addition   chances  of  collisions  as  multiple  work
         to site machinery, such as earth-moving   fronts interact. The benefits of anti-col-  Using just two cranes in fixed locations,
                                                                               Marr’s  methodology on  the NRT Castle Hill
         equipment, mobile cranes, concrete, re-  lision technology are widely preached in   Station project catered to the challenge of
         inforcing steel, and general construction           continued on page 40  lifting elements weighing up to 60 tonnes.
         38     Wire Rope News & Sling Technology   June 2019
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