KR형 레일체결장치 기반 접속부침목의 개발 및 성능검증

This study developed and verified transition zone sleepers based on the KR-type rail fastening system, originally developed for concrete tracks by the Korea Railroad Research Institute. The system implemented a five-stage progressive stiffness transition (Formula Presented) to minimize dynamic amplification at track structure discontinuities. Performance verification included static tests confirming 25-27 kN clamping force, dynamic tests at 2-50 Hz frequency range, and extended fatigue tests of 5xl06 cycles. Field monitoring over 12 months demonstrated 0.3mm/month track irregularity progression and 96% clamping force retention. The study establishes an empirical data- based design approach specialized for the Korean railway environment, which is characterized by extreme temperature variations and granite weathered soil conditions.