[WRE | SPOTLIGHT]
Marr only had to take their large mobile crane onsite twice – for install and removal – helping to decongest the site and reduce costs
“THE SITE WAS CONGESTED AND LANDLOCKED BETWEEN TWO EXISTING ROADS. THE CRAWLERS PROPOSED WOULD HAVE PLACED A LARGE SURGE LOAD AGAINST THE STATION BOX WALLS, WHICH MEANT THAT THE CLIENT WOULD HAVE TO EXCAVATE AROUND THE BOX AND FILL IN WITH GROUNDWORKS TO SPECIFIC BEARING PRESSURES.”
Marr Contracting Managing Director, Simon
Marr, said, “Te site was congested and landlocked between two existing roads. Te crawlers proposed would have placed a large surge load against the station box walls, which meant that the client would have to excavate around the box and fill in with groundworks to specific bearing pressures. Te costs were excessive and would have had a major impact on the program. Furthermore, using the crawlers would still have been a limited solution.” He added, “Te project will serve as a blueprint
for future mega projects as decision makers recognize the benefits of decongested sites. Our approach, not only with NRT but other clients also, is to use less cranes, but the right cranes to achieve greater efficiencies. For example, our solution facilitated lifting of loads from outside the project’s boundaries, which further decluttered the site and led to additional time and economic savings – not to mention a safer work environment.” Te cranes provided were both the result of design collaboration between Marr and manufacturer Favelle Favco: a 330t capacity M2480D with 90m boom and a 200t capacity M1680D with 62m boom. Tey lifted a variety of loads, including pre-cast beams,
columns and panels weighing up to 60t; in addition to site machinery, such as earth-moving equipment, mobile cranes, concrete, reinforcing steel, and general construction materials required for a tunnels project of such magnitude. Dialogue was opened in April 2016, and a craneage methodology developed in consultation with the client to suit their preferred construction methodology. Te first crane was erected a year later and the job completed in October 2018.
Marr Contracting have leveraged the success of the NRT project to present the benefits of combining fewer cranes with greater efficiency on similar scale sites, including the new Sydney Metro City and
Southwest Stage where they have been awarded multiple stations using this same new technology. A number of global projects have adopted the cut-and-cover box method, where crawler cranes are nearly always the immediate consideration. However, the installation of the right tower cranes can change the way the entire project is constructed, principally because of the ability to lift bigger pieces, reduce land, and remove the requirement for costly, challenging, and time-consuming groundworks.
WIRE ROPE EXCHANGE MAY–JUNE 2019 23
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