ABSTRACT
Keywords: displacement screw piles, installation effort
1 UPDATED ACQUISITION OF DATA
The data acquisition system used by Berkel in 2003 was an analog system with a limited number of available signal inputs. Recording grout pressure for quality assurance during pile casting used one of the available inputs, leaving two remaining inputs for data recorded during drilling tool penetration. These were used for recording of stem depth and KDK pressure (the hydraulic fluid pressure applied to the rotary head). Since then, this system has been replaced by a digital system which allows for greater flexibility in the number of inputs that can be acquired and recorded. Two primary additional inputs have been added. The first was the measurement of grout volume during pile casting by means of a flow meter. More recently, the recording of drill stem rotation during pile penetration has been recorded as well. Figure 1 shows a typical drilling platform and the location of these sensors. A detailed description of the data acquisition system can be found in the 2002 paper by the authors.
