In each case, the new middle section, measuring 30m long and weighing 2,540t, was transported from an assembly area within the shipyard. Then the bow section, measuring 225m long and weighing 10,500t, was skidded 45m across skid tracks, then installed in three slip lines, one central and two lateral.
The intermediate section was transported to its final position to be joined with the aft section. Finally, the bow was skidded to be joined to the new section. In consideration of the sheer size and weight of the sections, ALE opted for lateral skidding to ensure stability throughout.
“We used our experience from similar operations around the world to complete this kind of project for the first time in the country,” explained Filippo Anello, Global Projects Division Director for ALE.
“By working closely with the client, applying our knowledge and a tailored engineering solution in this way, it represents a major milestone for ALE in this sector and demonstrates our commitment to providing specialist heavylifting services to our clients in Italy with the potential to utilise these methods on other projects.”
ALE optimised their equipment fleet and deployed skid shoes, varying from 500t – 1,000t capacity, along with 96 axle lines of SPMT in a configuration of 4 x 2 file 24.
The Grimaldi Roma and Grimaldi Barcelona are two sister ships that were built in 2007 and 2008 respectively. Following the lengthening, each ship now has 600 additional linear meters for heavy vehicles, capacity for an extra 80 sleeping berths in new passenger cabins and two new public spaces.