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김만화(Man Hwa. Kim),한경성(Kyung Sung. Han),김학선(Hak Seon. Kim),공형식(Hyung Sik .Gong),김창훈(Chang Hoon. Kim),정지승(Ji chung. Jeong) 한국도시철도학회 2016 한국도시철도학회논문집 Vol.4 No.4
PM10 which has been accumulated in the subway tunnel spreads to the platform and concourse, thereby aggravating air quality of the underground station. By ingredients analysis of PM10 in the tunnel, it found that the main ingredient of PM10 is Iron(Fe) which is caused by the friction between rail and wheel as the train is running. Especially, this study shows that the wear progress of the high rail at the curve is affecting on the distribution of fine dust in the tunnel.
김준현(Jun-Hyun Kim),윤현식(Hun-Sik Yoon),서강진(Kang-Jin Seo),우희영(Hee-Yeong Woo),김만화(Man-Hwa Kim),박종헌(Jong-Hun Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Underground Subway station’s air pollutants are introduced from the indoor or outdoor. And Radon is a major pollutant in the subway station. Radioactive substances Radon is occuring naturally in granite tunnel wall and underground water. Especially inert gas Radon that causes lung cancer in human is anywhere but 5678 S.M.R.T. tunnels deep and pass through the granite plaque have a lot of Radon. The Radon concentration is determined by the following reasons : radon content of soil and concrete, underground water, ventilation, pressure differnce, building structure, temperature, etc. So Radon concentration is hard to predict. And we can’t only ventilate owing to era of high oil prices. This study focuses on our efforts for the reduction of Radon concentration. And the purpose is to provide basically datas of specially managed 15 subway station’s Radon concentration.
이영권(Young-Kwon Lee),김일홍(Il-Hong Kim),조병기(Byung-Ki Jo),김만화(Man-Hwa Kim),박종헌(Jong-Heon Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Air pollution in subway tunnel is primarily caused from the wear of metallic materials. As undesirable substance, PM(Particulate Matter) can especially harm the health of passengers and workers as well as clog the main parts of rolling stock such as inverters. To improve the air quality in subway tunnel, SMRT(Seoul Metropolitan Rapid Transit Corporation) has developed anti-pollution devices such as Magnetic Dust Collector, Vacuum Cleaner For Rail Road and Particulate Removing Sprinkler Vehicle. Introducing these mechanical devices, this paper is mainly devoted to explaining the characteristics of collected dust according to the result of particle-size analysis and componential analysis.
고성기(Soung-Gee Ko),국윤모(Yun-Mo Kuk),김만화(Man-Hwa Kim),박종헌(Jong-Hun Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Seoul Metropolitan Rapid Transit Corporation has 148’s stations. Total length is 152km and most of the station is located in the basement and Groundwater occur inflow of 700,000 tons per day. Groundwater is treated as a natural flow way instead of artificial ways. Therefore, most of the collection wells is located in the low place or station for the efficient induction and collecting water. Manhole overtopping is occurring frequently because groundwater is concentrated in the drain pipe near the collecting well and heavy rainfall in summer. As a result, ballast contamination and radon levels are increased in tunnel. This paper introduces a solution is increasing overflow in tunnel, which introduces drainage system of non-motorized that uses differencial head between collecting well and manhole.
임성은(Sung Eun Lim),최철수(Chol Su Choi),김만화(Man Hwa Kim),최진유(Jin Yu Choi),박용걸(Yong Gul Park) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
서울도시철도 5~8 호선은 플로팅 궤도인 STEDEF 형식 구조로 궤도지지강성을 결정짓는 주요재료는 침목패드이다. 장기간 공용중인 침목패드는 노후화로 인하여 두께의 감소와 스프링 정수의 증가로 나타난다. 침목패드의 두께 감소와 스프링 정수의 증가에 따라 궤도지지강성이 증가하여 궤도시설물의 손상에 영향을 미칠 것으로 판단된다. 이에 본 연구에서는 장기간 공용중인 침목패드의 두께와 스프링 정수를 측정하여 침목패드의 노후화에 따른 기능상실을 확인하였고, 침목패드의 스프링 정수와 두께변화(감소량) 시험결과 서로 상관관계가 있는 것으로 분석되어 현장에서 침목패드 두께치수 측정이 스프링 정수를 개략적으로 평가하는 방법이 유효한 것으로 검증되었다. Lines 5 – 8 of the Seoul Metropolitan Rapid Transit have their track in the form of STEDEF on the floating track, and it is the sleeper pads that determine the track support stiffness. The decrepitude of the sleeper pads in long-term use results in the decrease in their thickness and increase in the spring constant. They are the causes of the increment in the track support stiffness, which influences the damage of the track structure. This study has identified the loss in the function of the sleeping pads caused by their decrepitude by means of measuring their thickness and the spring constant. It has proven that there exists a correlation between the spring constant and the thickness of the spring pads, and thus by measuring the thickness of the sleeper pads on the spot, evaluating their spring constant is possible.