Helical pile design from a boring log, worked end to end on a real Tampa profile — N-values to soil parameters, helix sizing, and the installation torque you specify. Including the two configurations that fail.
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How wireline core drilling works — the core barrel and overshot anatomy, NQ/HQ/PQ sizes, water flow, and why there is no active ASTM standard for rock coring right now.
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Helical piles install fast, quiet, and vibration-free, and are the only deep foundation whose design capacity is routinely accepted from an installation-torque correlation written into code. They lose to micropiles and drilled shafts in gravel, cobbles, very dense soil, and aggressive soils.
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SPT testing drives a 2-inch split-spoon sampler 18 inches into the bottom of a borehole with a 140-pound hammer falling 30 inches. The N-value is the sum of the second and third 6-inch increments — and the procedure, not the soil, is where the error lives.
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CPT pushes an instrumented cone and returns a continuous soil profile with no sample. SPT drives a split-spoon sampler and returns both a blow count and real soil. A neutral comparison from a manufacturer that builds both rigs.
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