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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