Recovery of the tunnel boring machine (TBM) that delivered subsea tunnel for the Beatrice Offshore Wind Farm in Scotland has called for a bespoke lifting solution.
Modulift developed a custom lifting beam, slings and shackles for Stockton Drilling to lift the 28t, 18m long TBM from the seabed, which is believed to be a world first.
Stockton used the TBM to undertake two 450m long landfall cable tunnels for the wind farm project that will deliver up to 584MW of energy when it is completed in 2019.
Direct Pipe suppled the hybrid TBM which combines microtunnelling techniques with pipe-jacking to install the lining as it advances. According to Stockton, pebbles and cobbles within the alluvium and sandstone bedrock prevented the use of horizontal directional drilling.
The TBM was recovered using a remote disconnect module and divers were used to attach the lifting equipment.