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활동체결장치가 설치된 교량상판 신축이음부에서의 궤도고저틀림에 미치는 영향
엄종우(Eom Jong-Woo),김시철(Kim Si-Chul),김인재(Kim In Jae) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In designing the high-speed railroad track, it is important to utilize appropriate track components to maintain uniform stiffness and ensure track alignment within the tolerance set for that system. In this regard, continuous welded rails (CWRs) were introduced to the Korean railways. Yet the installation of CWRs can result in an adverse impact due to the track/structure interaction on bridge sections yielding variations in the stiffness at the expansion joints. It may also impose additional axial force, generate excessive stress or deflection on track, and loosen the ballast at the ends as a bridge deck contracts or expands owing to a thermally-induced dynamic response. The risk is even greater in a long bridge deck, resulting in track longitudinal irregularities, deteriorating passenger"s comfort, and increasing maintenance efforts. This study evaluates the performance of ZLR and their impact on track longitudinal irregularities through the track measuring results on a test section installed the ZLR in order to minimize the thermally-induced responses and the maintenance efforts for the high speed railway bridges.
콘크리트궤도 유지보수기준 정립을 위한 연구방향 (Research directions for maintenance criteria in Slab Track)
엄종우(Jong-Woo Eom),이명석(Myung-Suk Lee),권진수(Jin-Soo Kwon),김수정(Soo-Jung Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
The Ballast Track has been widely applied in traditionally due to low initial cost and abundant elastic property. But the disadvantages of Ballast track are; labor-intensive and costly maintenance, weak in high-speed and heavy axial load, in additionally need wide cross section of tunnel and massive substructure in viaduct. Therefore, recent applications tend to more and more towards slab track such as Gyeungbu high speed rail and existing line. The slab track increased the stability, resistance and durability of track, and save maintenance cost compare to the Ballast Track. But the slab track have weakness of track elongation by sub-ballast differential settlement and that threat safety of train operation. Therefor the slab track need to prevent cracks in concrete ballast for insure the durability of slab track. In this paper, review main items and its expected effects of the slab track maintenance standards that control sub-ballast settlement and concrete ballast cracks.
일반철도 유지보수 합리화를 위한 궤도틀림 기준 연구방향
김수정(Soo-Jeong KIM),이병혁(Byeong-Hyeok Lee),이두재(Du-Jas Lee),엄종우(Jong-Woo Eom) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Currently the train operating environment to affect track irregularity is changed rapidly such as speed-up linear improvement and rolling stack upgrade. The recent track maintenance criteria of track irregularity was quoted from past Japan's and the needs of revision of criteria are increased because of the rapid change in train operating environment. In case of enhance the track irregularity criteria it secure driving safety and riding comfort but maintenance cost are increase. And also decrease ballast durability by frequent corrective work. In case of mitigate the criteria it decrease driving safety and riding comfort but save the maintenance cost. The study for enacting rational criteria did not carry out so far. In this study survey the domestic and international track irregularity and case study for track irregularity inspection results and maintenance history for guideline of enacting irregularity criteria study.
백효순(Hyo-Soon Baek),최용진(Yong-Jin Choi),백진호(Jin-Ho Baek),엄종우(Jong-Woo Eom) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
Railways are different from other means of transportation, especially in bridges, which is a special condition in which trains with large loads run parallel along parallel tracks. In the era of high-speed operation, the application of long bridges to bridges is still difficult, and the problems of structural change and long-term deflection and orbital stability due to temperature expansion between trajectories and bridges must be seriously considered. In this paper, we will examine the history of development by bridge type by classifying the conventional railway bridge in the 1990 "s and the modern railway bridge since 1990 before the introduction of the high - speed railway, We propose the development direction of bridges fitted to the above-mentioned high speed railway while maintaining the direction of future railway bridge and existing vehicle and railway system.