C458 - Pen Y Fan Wind Turbine - Jones Brothers …Smith!Construction! Stonemasonry!! Robert!George! Fencing!! ! & All!subcontractorswere!prequalified!following!a!thorough!vetting!

Scheme  Data  Sheet    Scheme  Name:   Pen  Y  Fan  Wind  Turbine  Enabling  Works    Form  of  Contract:   ECC  Option  A    Value:   £170,000.00    Programme:   September  2014  (3  Month  Duration)    __________________________________________________________________________________  

      jbhl.co.uk    

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Principal  Contractor:   Jones  Brothers  (Henllan)  Ltd      Design  Responsibility:   Client    Client:   MDA  Renewables  Ltd    Description  /  Key  Delivery  Features:   The  work   entailed   constructing   a   new   3.5m  wide   access   track   and  

reinforced   concrete   turbine   and   crane  base  within   an   exposed   and  isolated,  barren  rugged  mountainous  site.      

                 Relevance:   The  works  comprise  of  the  civils  elements  involved  with  the  erection  

of  a  wind  turbine:-­‐    • Construction  of  a  reinforced  concrete  base  to  be  formed  in  

two  sections  incorporating  the        installation  of  anchor  bolts.    • Construction  of  400m  of  access  track  3.5m  wide  including  a  

crane  base  using  geotextile  and  granular  material.    • Construction  of  a  reinforced  concrete  base  to  accommodate  

a  transformer  unit.    

• Excavate   approximately   500m  of   trench   to   receive   electric  cables  and  ducts.  

 Challenges  Met  /  Solutions  Provided:   The  access   road  was  built   to  extremely  onerous  standards   in   terms  

of   horizontal   and   vertical  alignment   in   order   to  accommodate   turbine   delivery  arrangements.   The   road   was  constructed   on   a   peaty   soil  which   was   stripped   and  overlaid   with   compacted  imported   granular   sub-­‐base.  This   sub-­‐base   was   laid   on   a  geotextile   membrane   which  

Scheme  Data  Sheet    Scheme  Name:   Pen  Y  Fan  Wind  Turbine  Enabling  Works    Form  of  Contract:   ECC  Option  A    Value:   £170,000.00    Programme:   September  2014  (3  Month  Duration)    __________________________________________________________________________________  

      jbhl.co.uk    

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improved  structural  integrity  and  facilitated  drainage.         The  heavy  plant  deployed   included  two  20  tonne  360  excavators,  a  

D6  bulldozer  with  a  6  way  blade  and  a  twin  drum  vibrating  roller.  The  two  excavators  were  used   to  undertake   the  preparatory  earthwork  operations  to  establish  road  formation  levels.  The  imported  sub-­‐base  was  spread  from  the  entrance  into  the  turbine  site  itself  using  the  D6  bulldozer   with   a   vibrating   roller   following   on   to   provide   the  compaction  levels  required.  CBR  penetration  tests  were  undertaken  to   evaluate   the   mechanical   strength   of   road   subgrades   and   base-­‐courses.   Drainage   diversions   were   also   undertaken   to   ensure   the  integrity  of  existing  open  ditches  was  not  compromised.    

    The   site   itself  was   extremely   exposed   and   appropriate   site  welfare  

facilities  were  provided  to  our  workforce.  These  facilities  were  made  available  to  the  turbine  installation  contract  following  completion  of  the  enabling  works.  The  contract  was  overseen  by  Mott  MacDonald  who  both  designed  and  project  managed  the  contract.  

Principal  Supply  Chain  Partners:   Most  work  was  undertaken  by  Jones  Brothers  (Henllan)  Ltd  internal  labour   and   equipment   resources;   however,   subcontracted   trades  included:  

    Noble  Civil  Engineering   Formwork  /  Reinforcement     J  A  Smith  Construction   Stonemasonry     Robert  George   Fencing         All   subcontractors   were   prequalified   following   a   thorough   vetting  

process   and   included   on   our   Approved   Supply   Chain   Database.   All  were   locally   based   and   were   required   to   be   involved   in   the  preparation  of  the  programme  to  ensure  that  there  was  an  efficient  deployment  of  resources  and  ownership  of  the  overall  programme.  

References:   Amanda  Phillips    

  Mott  Macdonald         Fitzalan  House     Fitzalan  Road     Cardiff     CF24  0EL         Tel:     02920  467870     Email:     [email protected]