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철도시설물 유지보수 공정에 따른 보건과 환경 측면에서의 유해요인 도출에 관한 연구 – 시설, 전기분야를 중심으로 –
최진유,염병수,갈원모 대한설비관리학회 2023 대한설비관리학회지 Vol.28 No.3
Various occupational disease problems of railway maintenance workers have been continuously raised, but due to the characteristics of railway facility maintenance work different from the other transportation industry, there were a lot of difficulties in managing occupational diseases comprehensively considering health and environment. Through the work environment analysis, environmental and health hazards that may occur to railway maintenance workers were derived. The derived hazards can be summarized as dust, noise and vibration, musculoskeletal disorders, heat-related disorders, harmful chemicals, ventilation, heat waves, and ultraviolet exposure. In addition, measures were proposed for railway maintenance workers to prevent occupational diseases caused by these hazards. The results of this study can be used as basic data for system establishment that can comprehensively consider health, environment, and safety.
최진유,양기재,박남회,강영종 한국전산구조공학회 2000 한국전산구조공학회논문집 Vol.13 No.1
교량 바닥판 설계에 대한 현 시방규정은 바닥판 슬래브가 처짐이 구속된 거더에 연속 지지되어 있다고 가정하므로, 바닥판 지간 중앙의 정모멘트와 거더 상단에 발생하는 부모멘트의 크기가 같은 것으로 간주하고 있다. 그러나 바닥판에 발생하는 휨모멘트는 거더의 처짐에 의해서 많은 영향을 받고 있으며, 거더의 처짐을 고려치 않는 현 시방규정에 의해 설계된 바닥판은 상부철근의 부식으로 인한 내구성 저하와 유지보수 비용 증가 등의 문제점을 안고 있다. 따라서 본 연구에서는 매크로 요소를 이용해 거더의 처짐 효과를 고려할 수 있는 해석법을 개발하였고, 이를 유한요소법을 통해 검증하였다. 또한, 이 해석법을 바탕으로 바닥판의 횡방향 휨모멘트에 영향을 미치는 여러 변수에 대한 분석을 수행하였다. 해석 결과, 바닥판의 지점부 모멘트는 거더의 간격뿐만 아니라 거더와 바닥판의 휨강성비 교량의 길이, 하중의 재하위치, 거더의 비틀림 강성, 가로보의 휨강성과 배치 간격 등에 많은 영향을 받고 있는 것을 알 수 있으며, 영향선을 이용해 최대하중 위치를 결정하여 몇 개의 예제교량을 대상으로 지점부의 설계모멘트를 계산해 본 결과, 현 시방규정이 다소 보수적인 값을 나타내고 있다. Current specification prescribes that upper and lower reinforcement mat is required in the same amount to resist negative and positive moment in bridge decks. But the negative moment is much smaller than positive moment because the actual behavior of decks consists of local deflection of slab and global deflection of girder. From this study, the analysis method based on harmonic analysis and slope-deflection method was developed and verified by finite element method. The negative moment, obtained from this method, were smaller than those computed based on the KHBDC specifications as much as 40∼50% in the middle of bridge. The amount of reduction of the design negative moment was shown herein to be dependent on variable parameters as shape factor(S/L) of slab, relative stiffness ratio of girder and deck slab, and so on. This investigations indicate that the upper reinforcement mat to resist negative moment can be removed. But further experimental study is required to consider durability and serviceability. From this new design concept, the construction expense can be reduced and the problem of decreasing durability resulting from corrosion of upper reinforcement steel settled.
최진유(Choi Jin Yu),김인재(Kim In Jae),황성호(Hwang Sung Ho),양신추(Yang Shin Chu) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The demand on a turnout layed on a bridge is rising owing to the increasing number of stations on the viaduct. And also the demand on a turnout with CWR is rising to upgrade running speed of the passing train. A CWR connected with turnout is subjected to additional axial force induced by the actions due to change in temperature, braking and starting force, and bending of the deck. But magnitude and distribution of the axial force in rails of turnout is not clear yet. So, in this study, a field measurement was conducted to know them. The strain gage method was adopted for field test. The FBG sensor for the strain measurement was used to ensure stability of test value and durability of gage for long term. It is expected that we can get data on the axial force in rail connected with turnout with respect to seasonal temperature change by the established field test system.
최진유(Jin-Yu Choi),박찬우(Chanwoo Park) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.6
최근 국내에서는 산악지역에 거주하는 주민들의 겨울철 폭설과 결빙에 의한 통행 제한으로 겪는 생활의 어려움을 해결하기 위하여 산악철도시스템의 개발을 진행하고 있다. 본 논문에서는 개발 중인 산악철도시스템의 특성을 분석하고, 톱니바퀴형 산악철도와 트램의 과거 사고사례들, 그리고 일반적으로 철도에서 정의하고 있는 위험요인 등을 고려하여 산악철도시스템에 적합한 위험요인들을 식별하였다. 산악철도 운행 시 예상 가능한 사고를 충돌사고, 탈선사고, 화재사고, 사상사고, 건널목/경합구간 사고의 5가지 사고로 분류하였고 각 사고별로 위험사건과 위험요인을 식별하였다. 그리고 각 위험요인별로 세부위험요인을 식별하였다. 본 논문에서 식별된 산악철도시스템의 위험요인들은 향후 산악철도시스템의 예비위험도 분석과 안전관리대책 수립의 기초자료로 활용될 수 있을 것이다. In Korea, a mountain railway system is being developed to solve the difficulties of residents living in the mountain areas due to the restriction of traffic by heavy snow and ice in winter. In this study, the hazard identification which is customized to the developing mountain railway system was conducted by considering the characteristics of the developing system, past accident cases of the mountain trains of the rack&pinion type and trams in the world, and risk factors defined in the ordinary railway system. Predictable accidents during mountain railway operation were classified into five types of accidents: collision, derailment, fire, casualty, and crossing/competitive section accidents. Hazardous events and hazards were derived for each accident. Moreover, specific hazards were derived for each hazard. The hazards of the mountain railway system identified in this study can be used as basic data for preliminary hazard analysis and establishment of safety management measures for mountain railway systems in the future.
레일의 단ㆍ장파장 결함에 따른 궤도의 동적응답 변화특성 분석
최진유(Choi Jin Yu),황만호(Hwang Man Ho),양신추(Yang Shin Chu),황성호(Hwang Sung Ho) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
A numerical analysis was performed to verify how much additional force is induced by short or long pitch rail corrugations in track. The rail corrugations assumed as sine wave having various pitches and depths. The variation of wheel force, displacement and acceleration of rail and sleeper was investigated. In the results, it was shown that each item of the investigation was increased as the pitches and depths become large. It is expected that the results of the parametric study can be used as a preliminary data for the determination of economical maintenance criteria for rail corrugation in the future.
최진유(Choi Jin-Yu),최일윤(Choi Il-Yun),이준석(Lee Jun-Seok),김태욱(Kim Tae-Wook),이동형(Lee Dong-Hyung),서정원(Seo Jeung-Won) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In recently, rail deteriorations -rolling contact fatigue, wear, etc- arise as hot issue of track maintenance by speed increasing of railway. And the relative importance of the rail maintenance in concrete track, which is adopted as a track system for 2nd phase of Kyung-Bu and Ho-Nam high speed line, will be increased much more. Furthermore the rail maintenance trouble was already serious in Metro by excessive wear of rail profile, and excessive noise in sharp curve line. But effective scheme for the rail maintenance is established yet in our country. To work out such a problem by laboratory test or simulation, the wheel-rail contact simulator was developed. The simulator was developed to test various phenomena on wheel and rail surface by contact of wheel and rail at speed of maximum 400㎞/h using real scale wheel and rail which are also variable. And, using the simulator, it can be investigate deterioration phenomena of wheel and rail under various contact angle, attack angle, running speed, environmental condition, wheel and thrust load condition. The test results using the machine can be used for improvement of profile of wheel and rail, estimation of life period of rail and wheel etc, and, after all, it leads effective maintenance of wheel and rail.