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full range. After the dynamic test the   and Red Rock Power.
                                            frame was then filled to 20,000 lbs.”  Stockton’s scope of work included the
                                              Aboard the  same  vessel,  the  load-  trenchless installation of two indepen-
                                            shackle was integral to safe completion   dent 48-inch x 450m steel landfalls for
                                            of  a static load test of  a hydro  boom   high-velocity  cables by utilizing  Her-
                                            that extended  out from the starboard   renknecht’s  DirectPipe  system and
                                            (right) side of the boat to lower scien-  AVN1000 micro  tunnelling  machine.
                                            tific equipment into the water.    DirectPipe, a hybrid micro-tunnelling
                                              If required,  SP’s  wireless  data log-  and pipe-jack system that lines  the
                                            ging software allows for simultaneous   tunnel as it advances, was selected due
                                            control, display and real time data log-  to un-drillable geology.
                                            ging of up to 100  SP telemetry  load   In a world-first, the TBM was recov-
                                            cells. Logged data is captured in a .csv   ered from the sea after each drive us-
                                            file format and opens in MS Excel pro-  ing a remote disconnect module. Divers
                                            viding easy visual presentation, analy-  were then dispatched to the TBM’s loca-
                                            sis of logged data, and simple test cer-  tion to attach the 34t capacity, 16.6m-
                                            tificate generation.               long beam so a 120t capacity crane,
                                              Williams concluded:  “The SP  equip-  placed on a rented jack-up barge, could
                                            ment has been flawless; the durability,   lift it out of the water and place it on a
                                            accuracy and transmission range of the   multi-cat for return to Buckie Harbour.
                                            load cell is stellar.”               Modulift was challenged with design
                                                                               and manufacture of a below-the-hook
                                            Modulift Beam Lifts Tunnel         solution to lift the TBM from beneath
                                            Boring Machine in World            the surface, where it was to be found
                                            First                              four  degrees from horizontal.  The
                                              Modulift provided a custom lifting   TBM is  made up of 10 modules that
         Aboard the Thomas G. Thompson research   beam,  slings  and  shackles  as special-  each have their own individual lifting
         vessel, the loadshackle was integral to safe   ist pipeline contractor Stockton Drilling   points, all of which were to be utilized
         completion of a static load test of a hydro boom.  completed multiple lifts of a 28t, 18m-  to provide equal loading and enable the
                                            long tunnel boring machine (TBM) that   machine to be lifted in one piece. The
         continued from previous page       was working subsea at the Beatrice Off-  beam also had three top lifting points
         every 30 seconds for 15 minutes.   shore Windfarm / Direct Pipe Landfalls   to facilitate rigging to the crane.
           In  another  application for  the  Uni-  (BOWL) project at Portgordon, Scotland.  Modulift  utilized  counterweights  so
         versity of Washington,  aboard the   The BOWL project is one of the larg-  the beam tilted when unloaded in order
         Thomas G. Thompson research vessel,   est private investments ever made in   to have the same inclination as the load
         the loadshackle was attached to the top   Scottish  infrastructure  and  produces   on the seabed, ensuring all bottom con-
         of a movable A-frame gantry; a water   584 megawatts from 84 turbines situ-  nections were carrying load. However,
         bag  was  then  filled  to  the  predeter-  ated in the outer Moray Firth, power-  the beam had to lift the TBM level. It
         mined weight. “In this case,” he said,   ing approximately 450,000 homes at a   was also manufactured to withstand
         “the  bag  was  filled  to  14,000  lbs.  and   cost of £2.6 billion to its investors SSE,   the  dynamic forces  present  in  the  de-
         then the frame was cycled through its   Copenhagen  Infrastructure  Partners   manding, marine environment.
                                                                                 Patric  Ridge,  Business  Development
                                                                               Manager  at  Stockton  Drilling,  said:
                                                                               “The product satisfied the requirements
                                                                               and standards set out at the beginning
                                                                               of the project. Lifting [the TBM] in one
                                                                               piece was a swifter, safer and more effi-
                                                                               cient process. Weather conditions had to
                                                                               be just right in order to perform the lift,
                                                                               so the lift had to be completed in a time-
                                                                               ly and safe manner. The process was
                                                                               further complicated by the low depth of
                                                                               water [less than 10m] in the area.”
                                                                                 Ridge explained that the TBM was
                                                                               submerged for less than 48 hours  for
                                                                               each 420m  drive, approximately  half-
                                                                               a-mile offshore.  Surface  alluvial com-
                                                                               prising  pebbles and cobbles,  overlay-
                                                                               ing bedrock of weathered sandstone,
                                                                               prevented the  use  of  more  traditional
                                                                               horizontal  directional  drilling  meth-
                                                                               ods.  Further,  the  beach  area around
                                                                               the landfall site is a designated Site of
                                                                               Specific Scientific Interest (SSSI).
                                                                               Stockton has retained the beam for
         The Modulift beam places the TBM on a multi-cat for return to Buckie Harbour.  future utilization.
         38     Wire Rope News & Sling Technology   February 2018
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