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최돈흥 ( Don Hoeng Choi ),최진우 ( Jin Woo Choi ),고성석 ( Seong Seok Go ) 한국안전학회(구 한국산업안전학회) 2011 한국안전학회지 Vol.26 No.3
Work platform is temporary material that many workers use in construction field, but many workers construct and use the work platform without considering safety standards, workers who have not the knowledge of safety standards construct the work platform in weakness and use the work platform in unstable, According to the statistics in 2009, 1230 people were injured at the work platform. Among them, victims by falling account for about 77% and mostly lead to fatal injuries. we have studied and survey about the safety or danger of the work platform(set limits to duble scaffold) in construction field and about how many workers observe safety standards of the work platform. According to the result of this survey, 24%~100%(average: 68%) of the work platform in survey is not observe the safety standards.
소규모 건설현장의 중대재해 저감 방안 도출을 위한 연구
백신원,김한중,최돈흥,Paik, Sin-Won,Kim, Han-Joong,Choi, Don-Heung 한국농공학회 2012 한국농공학회논문집 Vol.54 No.6
Many of the falling which is the number one risk factor in lethal accidents in construction could have been prevented if the right activity or supervising had been taken in time. All other measures do not preventive the fall, but rather intercept the fallen itself or preventive severe injury. The most common and the bets measures on the preventive measures are guardrails which are to be worn on the site. Workers always exposed the risk of serious accidents induced by causal effects related with environments around construction sites. In order to represent how to decrease the risk of workers, this study was accomplished with a number of interview with experienced site director, cheief of instructors, workers. And the questionaire survey (2012. 5~2012. 10) were used to make proposed policies which are expected to reduce critical disastrous accidents and strength authorized limits of director's management automatically.
최진우 ( Jin Woo Choi ),최돈흥 ( Don Hoeng Choi ),고성석 ( Seong Seok Go ) 한국안전학회(구 한국산업안전학회) 2011 한국안전학회지 Vol.26 No.3
The work plate in a construction sites is a frequent cause of falling. But the bulk of the work plates lent to the construction site are handled carelessly by workers. There is general concern about performance declining by repetitive use. However, there is not a accurate guide, research and study on reuse work plate. This study was conducted in order to judge the classification guide to reuse work plate and measure the performance of classified reuse work plates. It is the result that even the A-grade plates classified to be in good shape by workers are below the performance standard. This means that the guide and classification are ineffective.
고성석 ( Seong Seok Go ),여상구 ( Sang Ku Yeo ),최돈흥 ( Don Hoeng Choi ) 한국안전학회(구 한국산업안전학회) 2011 한국안전학회지 Vol.26 No.3
Death disaster among the disasters in construction field is mainly occurred by crash, and the work plate is the main objects causing crash. This study was performed by interview with workers in construction field to evaluate the consciousness on safety and to analyze the type of use and the state. Finally the problems while using work plate were appeared with its requirements for the improved use. Based on the results from this study, amendments were proposed for some parts of regulation related, and further four types of development on the safe work plate were presented. It is expected that the safer construction environment could be composed by using the results.
TS볼트체결에서 체결력 , 토오크계수 및 품질관리에 관한 연구
손승요(Seung Yo Son),신근하(Keun Ha Shin),최돈흥(Don Heung Choi),조인습(In Sub Cho),안교철(Kyo Chul Ahn) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.3
TS(abridged from Torque-Shear) bolts are originaly developed for the purpose of quality assurance in clamping force by means of fracture mechanism due to the stress concentration around the V-type notch at the bolt tip. In the control of tightening a bolt, torque factor as well as geometries of the notch (diameter, angle and roundness) are of prime importance to assure the quality of the joint performance in a structure. Some theoretical aspects of fastening torque and clamping force in a TS bolt are examined with focus on the friction coefficients. A simple relationship between face friction coefficient and thread friction one is derived, and numerical calculations and plots based on the experimental data are presented, which may be used as a complementary guide in a situation to cope with torque factor degradation. It is found that the interaction between friction torque on the thread and the tensile force developed in a bolt leads to an elliptic stress space. The upper limit of thread friction coefficient μ_s and the lower limit of face friction coefficient μ_w are derived and plotted against the axial force ratio.