DOUGHNUT AUGER SYSTEMS               

 

 - The inner drill string rotates clockwise,

   and the casing counter-clockwise     

 - Smooth drilling and extraction because

   the casing in rotation reduces friction     

 - Less noise and vibration-free

 - High degree of verticality

 - Casing can be left in the hole as a permanent pile

 1. AUGER BIT

 2. AUGER ROD

 3. HAMMER WITH SCREW

 2. SHROUD

 4. TOP SHEAVE

 5. SHROUDED ROD

 6. AIR OIL UNIT

 

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