| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.28 ( June 1993 ) Special Issue on Chemicals and New Materials and Construction Materials ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Method and Penetration Characteristics of Low-Noise and Low-Vibration Steel Pipe Piling (The Drill Pipe Method) Masaharu Hashimoto, Shinji Nishizawa, Seiji Sato, Yuya Sakurai, Osami Hashimoto, Chiyomaru Takahashi |
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Synopsis : The drill pile method is a low-noise/low-vibration piling method that a steel pipe pile which has spiral ribs and bits on both the inner and outer surfaces at the toe. The pile is twisted into the ground by means of a conventional pile driving machine, using special rotary jigs. After many applications to foundation construction, a more effective procedure has been established by improving the supporting process and instruments, including the penetration monitoring/controlling system (doctor system). The rotary penetration resistance (γTt value) obtained by the doctor system is correlated to both the ground strength (N value) at the pile toe and to the frictional resistance acting on the inner and outer pile surfaces. The correlation between γTt and the average N value at the bearing stratum becomes clearer when the effect of frictional resistance is eliminated by using the formulae proposed in this paper. The suitability of this construction procedure is proved from field experiments involving pull-out and horizontal load tests. |
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