The new best way for testing pile load, improved method of static load tests and foundation load tests!

Bi-directional load test (or otherwise named Osterberg test or O-cell test) utilizes the hydraulically operated ‘Super Cell’ load cells, embedded within the concrete of the pile shaft for load and pile capacity testing. Before installing the foundation piles, soil investigation reports has to be done, to find the most optimal location for Super Cell installation.

The embedded Super Cells are specially designed with built-in Super-jacks. Hydraulic pressure is applied to the load cells by hydraulic pumps on the ground, through flexible hoses pre-installed along the reinforcement cages. The pressure in the load cell is measured by pressure gauges (pressure sensors); the displacements of the upper/lower parts of the pile shaft are measured by displacement transducers, which are connected to the load cell by embedded telltale rods.

When loaded, the Super Cell would expand and push the upper shaft upwards, and the lower shaft downwards. This sequence mobilizes the side resistance and base resistance of the upper and lower lengths of the pile. By analyzing the relativity between the movement and load force/time (S-lgt, s-lgQ curves, etc.) the carrying capacities of both upper and lower portions of the piles can be determined. The total carrying capacity of the pile can be found by adding up the modified side resistance of upward pile shaft, and the base resistance of downward pile shaft.