CASE  STUDY  –  SCREW  PILES    

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Outline:    

It  has  long  been  thought  that  galvanising  screw  piles  is  not  necessary  because  the  galvanised  coating  will  be  removed  when  screwing  the  pile  into  the  ground.  

We  have  inspected  some  test  piles  that  were  driven  into  sandstone  at  Injune,  Queensland  then  removed  3  weeks  later.  The  galvanised  coating  was  still  present  and  the  coating  thickness  is  still  within  the  Australian  standard.    

These  screw  piles  were  also  exposed  to  the  elements  for  6  months  before  the  readings  were  taken.  

 

 

CASE  STUDY  –  SCREW  PILES    

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Specifics:  

When  these  piles  were  galvanised  the  coating  thickness  ranged  from  200um  –  300um.  

The  below  pictures  indicate  the  coating  thickness  after  being  removed  ranging  from  150um  –  260um.  The  leading  edge  of  the  blade  and  the  base  of  the  pile  had  the  galvising  removed  but  the  balance  of  the  pile  still  had  significant  thickness  to  provide  corrosion  protection.