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경전선 복선전철 및 부산신항 노반건설공사 중 PDT말뚝 적용성 연구
허억준(Hur Eok-Jun),박재명(Park Jae-Myung),윤수동(Yun Su-Dong),김태훈(Kim Tae-Hoon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In the past decades, complain about ground vibration and noise induced by pile driving has been quickly increased. Because of that, auger drilled piling methods have frequently used specially in urban area. However, the present auger drilled piling methods induce inevitable ground disturbance as well as a certain degree of vibration and noise due to the final hammering. For these reasons, a new auger drilled piling method is required to be developed. This paper introduces PDT(Pulse Discharge Technology) piling method and presents the characteristics of bearing capacity. The PDT piling method is to install in-situ piles using electric power so called Pulse. The pile installed by PDT appears to be able to develop shaft and end bearing capacity efficiently. This paper introduces PDT(Pulse Discharge Technology) piling method, which is the 512nd new construction technology . The PDT piling method is to install in-situ piles using electrical power so called Pulse power. The pulse power is physical value that indicates the energy change per unit time(dE/dt). Since the pulse power is to push ground, using the pulse power is enable a hole to be expanded as well as the ground to be improved by compaction. Therefore, The pile installed by PDT appears to be able to develop shaft and end bearing capacity efficiently. In this study, couples of pile loading tests were carried out to figure out whether or not the PDT piling method is applicable to constructions like rail road facility . As a result, it was concluded that the PDT piling technique meet the requirements for such a rail road related construction.
앵커 정착 부 확공을 위한 펄스방전의 양상과 작용압력에 관한 연구
신병우 ( Shin Byung-woo ),윤수동 ( Yun Su-dong ),차경섭 ( Cha Kyung Sub ),허억준 ( Hur Eok-jun ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
When the electricity is not flowing because the certain distance lies between positive (+) pole and negative (-) pole of electricity, we call the status as the air insulation. When the voltage is gradually increased to this status, the electricity is flowing breaking this insulation status at certain point, which we define as the insulation is broken. When the insulation is broken, big expansion pressure is occurred, which is the essence of technology of pulse discharge of electricity. We are utilizing this technology of pulse discharge of electricity to expand and press the cavity of ground foundation of anchor settlement with the aim of making the anchor body with great pushing power. The results of measuring the pressure at the experiment of chamber model generated are average 8 MPa with 250 mm of diameter (at 5000 voltage applied), and 16 MPa with 110mm (at 3500 voltage applied) respectively. This is direct pressure working to the wall of chamber which is equivalent to the wall of anchor settlement part where the intensity of pressure generated can be adjusted by regulating the voltage. In the future, it shall be verified about applicability to the ground through experiment of electricity discharge on the real ground; and the increase of pushing power through the expansion and press of cavity.