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Conformity Assessment of Vertical Static Stiffness Test Method for Rail Pad

레일패드 정적 수직강성 시험방법의 적합성 평가

  • Bae, Young-Hoon (High-speed Railroad Systems Research Center, Korea Railroad Research Institute) ;
  • Kim, Man-Cheol (High-speed Railroad Systems Research Center, Korea Railroad Research Institute)
  • Received : 2014.07.02
  • Accepted : 2014.12.10
  • Published : 2015.02.28

Abstract

The vertical static stiffness of rail pads or baseplate pads, which are important components in rail fastening systems for track safety, is a key factor to determine the total track stiffness and a guideline of quality control in the manufacturing process. The vertical static stiffness can be checked by laboratory testing: test methods are EN 13146-9 and KRS TR 0014, which are widely used in the railway field. In this paper, to correct some problems, namely the preloading step, the unloading level, and the holding time in the loading program in the vertical static stiffness test of EN 13146-9 and KRS TR 0014, domestic and foreign test standards of pads were analyzed and then certain schemes for a vertical static stiffness test were proposed. To assess the reliability of the proposed schemes, the vertical static stiffness tests were performed with 4 pads and the validity of the test results was estimated.

궤도 안전을 위한 핵심 용품인 레일체결장치의 구성품 중 레일패드 또는 베이스플레이트 패드의 정적 수직강성은 궤도 전체의 강성 결정 시 중요 인자이며, 패드 제품의 제조과정에서 품질관리 기준이 된다. 패드의 정적 수직강성 확인은 시험을 통해 가능하며, 시험방법으로는 철도분야에 널리 사용되고 있는 EN 13146-9 및 이를 부합화한 KRS TR 0014 규격이 있다. 본 논문에서는 상기 규격의 정적 수직강성 시험방법 중 예비하중 단계, 하중 제거 수준 및 하중 유지시간 관련 문제점 개선을 위해, 패드 관련 국내외 시험규격을 분석한 후 시험방법 안을 제시하였고, 철도현장에 사용되고 있는 패드 4종을 이용하여 시험방법 안을 적용한 정적 수직강성 시험을 수행하였다. 또한 시험방법 안의 적합성을 판단하기 위하여 시험결과에 대한 유효성 평가를 수행하였다.

Keywords

References

  1. European Committee for Standardization (2011) Railway applications-Track-Test methods for fastening systems-Part 9: Determination of stiffness, EN 13146-9:2009+A1:2011, Brussels, Belgium.
  2. Ministry of Land, Infrastructure and Transport (2013) Rail fastening systems, KRS TR 0014-13R, Sejong-si, Korea.
  3. Y.H. Bae, M.C. Kim (2013) Analysis of vertical static stiffness test methods for rail pads and proposition of test method, Proceeding of the 2013 Autumn Conference of the Korean Society for Railway, Daegu, pp. 899-904.
  4. Korean Agency for Technology and Standards (2011) Testing method for rubber vibration isolators, KS M 6604:2011, Eumseong-gun, Korea.
  5. American Society for Testing and Materials (2012) ASTM D575-91 Standard test methods for rubber properties in compression, West Conshohocken(PA), United States.
  6. Japanese Industrial Standards Committee (1990) Resilient sleeper pads for shock-absorbing, JIS E 1117:1990, Tokyo, Japan.
  7. European Committee for Standardization (2012) Railway applications-Track-Performance requirements for fastening systems-Part 2: Fastening systems for concrete sleepers, EN 13481-2:2012, Brussels, Belgium.
  8. European Committee for Standardization (2012) Railway applications-Track-Performance requirements for fastening systems-Part 5: Fastening systems for slab track with rail on the surface or rail embedded in a channel, EN 13481-5:2012, Brussels, Belgium.

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