When High Torque Misleads: Sand vs. Clay in a Real Screw Pile Project
In this video, we look at a real project in Copenhagen (CPH Village), where four seemingly identical screw piles produced completely different results.
– Three piles installed in clay: approx. 100–111 kN bearing capacity, torque 2200–2400 Nm
– One pile installed in sand: torque 6300 Nm (!) – but only 76 kN bearing capacity
This result clearly shows that torque alone cannot be used to document bearing capacity. Soil conditions are critical, and without measuring all three parameters — torque, advancement ratio, and rotation speed — you simply do not know what the piles are capable of. Aalborg University’s research strongly emphasises that correct documentation is essential if screw piles are to be a safe and competitive foundation solution.