Dynamic load tests
Dynamic tests of pile capacity are an approved and standardised test method. They are cheaper and faster than static tests. They do not require anchor piles or ballast. We have a large database of reference studies and therefore we do not always have to perform correlation studies for new projects. This method allows for much faster testing, leading directly to savings of time and money for all participants in the construction process.
The idea of measuring the load capacity of a pile using a dynamic method comes down to measuring accelerations and deformations in the level of the pile head during its dynamic sinking. For this purpose, two pairs of strain sensors and accelerometers, approximately one to one and a half times the diameter below the top of the pile under test, shall be mounted on the ground surface of the pile at a distance of 180° along the perimeter of the pile. The surfaces must be smooth and the concrete must be homogeneous, without soil contamination. The sensors are then connected to the signal recording device. A hammer for dynamic tests is placed over the pile and then dropped from a height directly on the pile. The height of the ejection is determined by the recorded load capacity of the pile, compression and tensile stresses. The drop height is increased until the permanent displacement is achieved and, at the same time, the stresses in the concrete and reinforcing steel of the pile are not exceeded.