
Cased double-head drilling for small-diameter piles. An internal auger with a rotary bit is used where ground conditions permit; a DTH hammer and auger string configuration handles rock inclusions. The auger conveys spoil upwards inside the casing.
| Technical data | |
|---|---|
| System diameter | 244.5–508 mm |
| Drive | Double head, rotary/rotary |
| Pipe/rod lengths | 500–6000 mm |
| Threads | Right-/left-hand, tapered or parallel |
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