Page 55 - Wire Rope News & Sling Technology - December 2018
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         Wirop_WRE_Aug2018H.indd   1                                                                   7/20/18   8:14 AM
         from the Seattle Operating Group  at   a one-over-one-over-three rig comprised   Modulift was called upon to make
         Mortenson,  explained that diversity   of five spreaders at different levels.  modifications  to  five  of  the  rigging  ar-
         of  rigging  was  required  as the  mod-  Flexible solution           rangements. Spencer explained that
         ules varied in size; the largest mea-  Sue  Spencer,  technical  director  at   alterations were necessary because of
         sured  10 ft.  wide  by 51 ft.  long  and   Modulift, said: “Whenever Polcom   obstructions caused by scaffolding. She
         weighed 45,000  lbs. (approx. 20.5t).   begins a new product, they ship the   added: “We had to redesign the rigs so
         Some modules had six lifting points   equipment to site and we provide the   they were much lower in height; we
         and others had eight. Further, not all   rig  drawings  as their  technical  part-  achieved it by reducing the sling angles
         of those points were in line and some   ner.  This  type  of  rig  is  flexible  and   above each spreader beam and in some
         modules had offset centres of gravity.   nicely balanced. We could have come   cases at less than a 45-degree angle be-
         The heights of lift also increased as the   up with a custom designed frame, but   neath. We also changed the types of con-
         hotel took shape, with the final storey   this would have been heavier and more   nection slings to the spreaders to avoid
         reaching 70 ft. from street level.  costly—and it would  have been  rigid   any clashing between the slings and the
           Modulift  prescribed cascading  rigs,   rather than flexible. Also, because the   beams due to lower [sling] angles.”
         consisting of spreader beams, slings,   customer  has  used  our  equipment on   MOD  24, MOD 34, MOD  50, and
         and  shackles,  which  proved the  most   many module installations, they had   MOD 70 spreader beams were all uti-
         cost-effective below-the-hook solution.   the  spreader beams required  in  their   lised during the project.  The longest
         For the eight-point lifts, a one-over-two-  fleet. They only had to purchase a small   and largest was a 30-ft.-long MOD 70,
         over-four  configuration  was  used,  con-  quantity of spreader beam struts.”  while the smallest and shortest was a
         sisting of seven spreader beams at dif-  Due to site constraints encoun-  MOD 24 at 5 ft. The slings were pre-
         ferent levels; and for the six-point lifts,   tered once the project was underway,   dominantly chain slings with shorten-
                                                                               ers so that the lengths could be adjust-
                                                                               ed to accommodate the aforementioned
                                                                               offset centres of gravity, with polyester
                                                                               slings to connect to the beams for the
                                                                               lower height rigs.
                                                                                 McCaskill pointed out that the writ-
                                                                               ing, visible on the side of the modules,
                                                                               identified  the  units  by  room  number
                                                                               within the hotel. It was also used to
                                                                               communicate the sequence at which the
                                                                                                continued on page 57

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