The CPT rig we mobilise across Sydney is a 20-tonne truck-mounted unit that pushes a 35.7 mm diameter cone at a steady 20 mm/s, recording tip resistance, sleeve friction, and pore pressure in real time. From the Hawkesbury Sandstone ridges in the north to the Botany Bay alluvial flats in the south, the cone's continuous profile reveals stratigraphy that conventional drilling often misses. For projects requiring undisturbed samples alongside the electronic log, we combine the CPT with calicatas exploratorias to verify soil classification at critical depths. The data acquisition system samples every 10 mm, giving engineers a high-resolution picture of the ground before they design a single footing.
A single CPT push in Sydney's alluvial basins can replace three or four SPT boreholes, delivering continuous stratigraphy without the disturbance of hammer-driven sampling.