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신병우(Shin Byung-Woo),윤수동(Yun Su Dong),김철영(Kim Choel-young),김태훈(Kim Tae-Hoon),허억준(Hur Euk-Jun) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
앵커 정착부를 확공하여 구형모양의 구근을 형성하여 인발력을 증대시키는 펄스방전장치를 개발하여 경제적이고 안정성 있는 앵커시공을 하는데 목적이 있다. 실험을 통해 펄스파워장비의 전기적 특성을 알아내었고, 그에 따른 에너지변화로 발생된 동적압력을 측정하였다. 여기서 측정된 동적압력이 앵커 정착부 주변지반에 충격력을 주는 확공 압력이며, 이 압력은 앵커 정착부 동다짐 효과로 확공 및 천공 면 다짐효과를 주어 보다 큰 마찰저항으로 인발력 증대에 크게 기여할 것으로 추정된다. This study intends to develop a pulse discharge device to strengthen the pushing power by expanding the cavity of the anchor settlement to form a spheric root for the purpose of constructing the economical and stable anchor. Through the experiments, the electrical characteristics of the pulse power equipment had been identified it and the dynamic pressure generated from the subsequent change had been measured. Here, the measured dynamic pressure is the cavity expansion pressure to impact on the ground around the anchor settlement. Since this pressure has effects of cavity expansion and bored surface hardening with dynamic hardening effects on the anchor settlement, it is expected that it will largely contribute the increase of pushing power with a strong frictional resistance.
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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.
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신병우 ( Shin Byung-woo ),윤수동 ( Yun Su Dong ),김철영 ( Kim Choel-young ),김태훈 ( Kim Tae-hoon ),허억준 ( Hur Euk-jun ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
앵커 정착부를 확공하여 구형모양의 구근을 형성하여 인발력을 증대시키는 펄스방전장치를 개발하여 경제적이고 안정성 있는 앵커시공을 하는데 목적이 있다. 실험을 통해 펄스파워장비의 전기적 특성을 알아내었고, 그에 따른 에너지변화로 발생된 동적압력을 측정하였다. 여기서 측정된 동적압력이 앵커 정착부 주변지반에 충격력을 주는 확공 압력이며, 이 압력은 앵커 정착 부동다짐 효과로 확공 및 천공 면 다짐효과를 주어 보다 큰 마찰저항으로 인발력 증대에 크게 기여할 것으로 추정된다. This study intends to develop a pulse discharge device to strengthen the pushing power by expanding the cavity of the anchor settlement to form a spheric root for the purpose of constructing the economical and stable anchor. Through the experiments, the electrical characteristics of the pulse power equipment had been identified it and the dynamic pressure generated from the subsequent change had been measured. Here, the measured dynamic pressure is the cavity expansion pressure to impact on the ground around the anchor settlement. Since this pressure has effects of cavity expansion and bored surface hardening with dynamic hardening effects on the anchor settlement, it is expected that it will largely contribute the increase of pushing power with a strong frictional resistance.
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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.
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비등방투수성 점토에 설치된 모형압밀촉진케이슨에 관한 실험연구
황성일,조남준,윤수동 국민대학교 생산기술연구소 2002 공학기술논문집 Vol.25 No.-
Caissons for accelerating consolidation(C.A.C.) are caisson walls in which many drain holes toward clays under consolidation are designed and installed to induce lateral dissipation of excessive pore water pressure. In this study, analytical solutions for two-dimensional anisotropic consolidation have been provided and a series of experimental works have been conducted. Results from both theory and experiments are compared and analyzed. Two reservoirs(840×300mm×500mm) for soil deposits are manufactured and used to conduct the model tests. The analytical solution for calculating settlements versus time can be developed based on Terzaghi’s consolidation theory by second order partial differential consolidation equation assuming boundary conditions of sand-clay interfaces. According to the results from theory, the settlement of clays including a sand layer(S_(w/sand)) is larger than that without a sand layer(S_(w/osand)) at a certain time. For example, if the ratio of horizontal to vertical permeability(ζ) is unity, (i.e., isotropic), S_(w/sand)/S_(w/osand) = 2.15 at the elapsed consolidation time of 20 hours and S_(w/sand)/S_(w/osand) = 1.5 at the elapsed consolidation time of 230 hours, respectively. And as the value of ζ increases, S_(w/sand)/S_(w/osand) increases. The results from experimental works show that S_(w/sand)/S_(w/osand) = 2 at the elapsed consolidation time of 20 hours, S_(w/sand)/S_(w/osand) = 1.5 at the elapsed consolidation time of 230 hours, respectively, which is very similar to those from thery. Conclusively, as permeability ratio increases, the C.A.C. becomes more effective.
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