Decision Path:

If:

Rock Hardness: Hard rock (f ≥ 8)

Construction Purpose: Blasting hole / Deep hole

Topographic Conditions: Open field

→ Choose: Down-the-hole (DTH) Drill

If:

Construction Purpose: Soft soil / Fractured layer

Topographic Conditions: Slope / Scaffold or

Topographic Conditions: Casing / Support hole

→ Choose: Anchor Drill 

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