• Title, Summary, Keyword: Fastening system

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Development of turnout on concrete track using Fast clip (Fast clip을 적용한 콘크리트궤도용 분기기 개발)

  • Hwang, Kwang-Ha;Ryou, Ki-Tae;Park, Chun-Bok;Park, Kwang-Ryoun;Yun, Byung-Hyun
    • Proceedings of the KSR Conference
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    • pp.1002-1008
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    • 2011
  • Turnout is a mechanical installation enabling railway trains to be guided from one track to another at a railway junction. there are classified variously according to rail type, sleeper type, fastening system, track type. Construction of concrete track are on the increase recently to secure the safety of track structure as well as to reduce the maintenance cost. SFC fastening system used the plain track a lot and for those reasons, The fast clip turnout demand growing to improving efficiency of the maintenance cost by unification of fastening clip on whole line. in this study is about development of the fastening system for new turnout using fast clip. this fastening system assembled elasticity pad underneath a base plate. its can change stiffness how to adjust contact surface area of elasticity pad Developed fastening system have passed test according to rule of KRS-TR0014-09R (rail fastening system) and Performance Certification by KR.

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An Experimental Study of Fastening System on CWR(Continuous Welded Rail) Track Stability (장대레일 궤도의 안정성에 미치는 체결장치의 실험적 연구)

  • Kim, Jung-Hun;Han, Sang-Yun;Lim, Nam-Hyoung;Kang, Young-Jong
    • Proceedings of the KSR Conference
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    • pp.317-324
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    • 2007
  • Until now, the railway has been constructed using track with jointed rails of relatively short lengths to allow thermal expansion in hot summer months. These joints weaken the track structurally and increase track maintenance cost and power consumption of the running train. The CWR(Continuous Welded Rail) Track is the solution of these drawbacks. Although the CWR track not only reduces the track maintenance cost but also increases the life cycle of track components, the stability of the track is highly affected by change of temperatures and vehicle load. A three dimensional nonlinear analysis which considers rail, fastening system and tie has been performed to understand structural behavior of the CWR track. In this case, the translational and rotational stiffness values of fastening system have not been studied. The fastening system makes ties and rails connect. In this study, the stiffness values of various types of fastening systems which consist of clips, rail-pads and insulators are determined by the experiment. The experimental results of the fastening system are compared with the results of parametric study that is performed to investigate the sensitivity of fastening system on stability of CWR track.

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The Parametric Study on the Performance Characteristics of Elastic Rail Fastening System on the Sharp Curved Track (급곡선 탄성레일체결장치의 거동특성에 미치는 매개변수 연구)

  • Baik, Chan-Ho;Joo, Bong-Gyu;Choi, Jung-Youl;Choi, Il-Yoon;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • pp.2163-2173
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    • 2011
  • In this study, the deformations and stresses occurred in the elastic rail fastening system were evaluated according to applied extreme track forces based on various field conditions, track curvature and poor properties. The purpose of this study is to establish a method for efficient management and suggest guide line for track construction in order to secure the performance quality of the elastic rail fastening system on the sharp curved track.. Therefore, initial construction qualities of rail and concrete bed, initial clamping force and applied extreme track forces were used into experiment as several parameters. Using these test results, the performance characteristics of the elastic rail fastening system were also evaluated. As a result, it suggested the method to secure long-term durability of fastening system and comparing sharp curved track to results on field test.

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An Experimental Study of Fastening System for Analysis of Rail Uplifting on Railway Bridge Ends (철도교량 단부 상향력 해석을 위한 체결장치의 실험적 연구)

  • Kim, Jung-Hun;Lim, Nam-Hyoung;Choi, Sang-Hyun;Kang, Young-Jong
    • 한국방재학회:학술대회논문집
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    • pp.307-311
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    • 2007
  • In the case of the railway bridges, uplift forces were occurred at the edge of the segments when vehicular loads were applied. These forces made the compressive and tensile forces occur in the fastening system. Therefore, the structural analysis was performed to investigate the safety of fastening system which was modeled as one directional spring element. In this case, the stiffness of the spring element was obtained from experimental study which was conducted by compressive load. For that reason, to perform rational and exact structural analysis, the translational stiffness of the fastening system obtained from the experimental study applied the tensile load and the rotational stiffness should be considered because it was occurred the tensile force as well as the compressive force in fastening system. In this study, an elastic and inelastic experimental study was performed for six specimens. The translational stiffness along the vertical axis of rail and the rotational stiffness along the strong axis of rail were investigated. Also structural behavior of the fastening system was analyzed.

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Effect on the Stress and Displacement of Aluminum Profiles Fastening Method (알루미늄 프로파일의 체결방법이 응력과 변위에 미치는 영향)

  • Hur, Jang-Wook;Shin, Baek-Cheon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.99-104
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    • 2015
  • This study analyzed the effects on displacement and stress as a result of improving the profile fastening method targeting rectangular-shaped and cube-shaped specimens. For the rectangular-shaped specimens, the improved fastening method reduced maximum displacement to 41.7% and maximum stress to 18.3% compared to the existing fastening method. For the cube-shaped specimens, maximum displacement and maximum stress results were found to be similar to those of the rectangular-shaped specimens. Thus, as a result of comparing the stress and displacement of the existing and improved fastening methods, it was found that the improved fastening method is superior to the existing fastening method in terms of load support.

An Experimental Study of Fastening System for Vertical Directions (체결장치의 수직 방향에 대한 실험적 연구)

  • Kim, Jung-Hun;Han, Sang-Yun;Lim, Nam-Hyoung;Kang, Young-Jong
    • Proceedings of the KSR Conference
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    • pp.1312-1319
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    • 2006
  • Several countries including Korea, Japan and European countries have reached the stage of planning, constructing their high-speed railway systems. High-speed train will become a key tool for intercity passenger transportation. Before that, safety of high-speed train must be secured. It is connected directly with track. The track is composed of ballast, tie, fastening and rail. Also, the fastening system makes tie and rail connect. In this case of the railway bridges used concrete slab track, the deflection of the bridge cause uplife of the rail at the areas between segments. In the structural analysis about it, stiffness of the fastening systems has been assumed. Therefore, use of the stiffness according to an experimental study needs. In this study, the stiffness values of various types of fastening systems are determined by the experiment and the structural behavior of fastening system is analyzed.

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A Study on the Development of New Rail Fastening Devices (철도레일체결장치의 국내 독자모델 개발에 관한 연구)

  • Kwon, Tae-Soo;Cho, Yong-Hyeon
    • Proceedings of the KSME Conference
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    • pp.819-824
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    • 2001
  • Most of rail fastening system used in the interior have depended on the foreign technologies. In this study, new rail fastening device is developed to estabilish the domestic technology. Especially, Pandrol and Vossloh rail fastening devices are analyzed to utilize the weak and strong points. New rail fastening device is designed to combine advantages of two other foreign devices.

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Experiment research on Field Applicability Evaluation of rail fastening system (개발형 레일체결장치의 현장적용성 평가를 위한 실험적 연구)

  • Kim Eun;Kang Yun Suk;Lee Il Wha;Yang Shin Chu
    • Proceedings of the KSR Conference
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    • pp.141-145
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    • 2003
  • Step-by-step laboratory performance test and repetitive improvement of KRRI rail fastening system show that it has the similar capability as other fastening systems that have been globally used. In this study, for the evaluation of field applicability, construction and rolling-stock operation test of KRRI rail fastening system are performed. Through this approach, comparison against the service criteria of foreign countries are made.

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An Experimental Study to Evaluate the Stiffness of Fastening Systems - Translational Stiffness along the Vertical Axis of Rail, Rotational Stiffness along the Strong Axis of Rail - (체결장치의 강성 평가를 위한 실험적 연구 - 레일 연직방향 병진강성, 레일 강축에 대한 회전강성 -)

  • Kim, Jung-Hun;Han, Sang-Yun;Lim, Nam-Hyoung;Kang, Young-Jong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.4
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    • pp.71-78
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    • 2008
  • In the case of the railway bridges, uplift forces were occurred at the edge of the segments when vehicular loads were applied. These forces caused the compressive and tensile forces in the fastening system. In the past, a structural analysis has been performed to investigate the safety of fastening system which was modeled with one directional spring elements based on the compressive test of fastening system. In this case, the stiffness of the spring element was obtained from experimental study which was conducted by compressive load. Therefore, to perform rational and exact structural analysis, the translational stiffness of the fastening system obtained from the experimental study applied the tensile load and the rotational stiffness should be considered because it was occurred the tensile force as well as the compressive force in fastening system. In this study, an elastic and inelastic experimental study was performed for six specimens. The translational stiffness along the vertical axis of rail and the rotational stiffness along the strong axis of rail were investigated, also structural behavior of the fastening system was analyzed.

The Reliability Design Method According to the Experimental Study of Components and Materials of Railway Rail Fastening System (철도용 레일체결장치 부품.소재의 실험적 연구를 통한 신뢰성 설계 방안)

  • Kim, Hyo-San;Park, Joon-Hyung;Kim, Myung-Ryule;Park, Kwang-Hwa;Lee, Dal-Jae
    • Proceedings of the KSR Conference
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    • pp.2090-2100
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    • 2011
  • Railway rail fastening system is the critical device which gives big influences to not only the vehicle driving stability and the orbit's structural stability against the impulsive load, but also the noise vibration and the ride comfort. As a part of the low-carbon green growth, the importance of the railroad industry is getting highlights on its excellent energy-efficiency and eco-friendliness. However, so far the Korea's domestic rail fastening system technology is not so good and the technical reliance to abroad is very heavy. In this study, we conducted comparative analysis on the rail fastening system with new and used one of the same type. And those systems are imported by Seoul Metro and are being used by it. With this basis, we developed the components and the materials and then, established the durability assessment methods appropriate to the Korean domestic circumstances. And through the reliability qualification test on the 7 parts of the rail fastening system, we've improved the reliability and guaranteed the 15 years of service lifetime. ($B_{10}Life15$) Establishment and standardization of Reliability Standard on the parts of the rail fastening system such as anti-vibration pads, guide-plate, screw spike made it possible to perform the internationally fair assessment. And it is thought that we can satisfy the manufactures' and consumers' needs of cost-cutting and qualification security by shortening of assessment period on rail fastening system.

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