Vibratory sheet / H-pile driving vs. bored piles (CFA / kelly)
Vibro side: Displacement piles in granular soils usually finish faster when vibration frequency and centrifugal force match CPT tip resistance; temporary works and floodwall sheet piles often stay on the critical path only with vibro productivity.
Bored-pile side: When adjacent utilities or settlement thresholds cannot tolerate vibration, rotary drilling torque inside a casing wins—even if daily meterage is lower—because the risk register stays inside geotech limits.
Mixed profiles commonly need both: vibro for temporary sheet piles, drill rig for permanent piles when ground pressure on spoil berms would overload a heavier crawler choice.