차열소재를 이용한 하절기 철도 레일 온도 저감 기술 연구

초록

The temperature of railway rails increases due to high temperatures in the summer and radiant heat from the sun, which causes thermal expansion. When a certain temperature threshold is exceeded, an extension phenomenon in which the track is twisted due to thermal expansion occurs, which may cause a large-scale accident such as train derailment. Therefore, railway operating organizations prepare various measures for railway rail temperature management every summer season, but the effect is insignificant in terms of performance and sustainability. In this study, in order to fundamentally solve this rise in rail temperature, a research was conducted to reduce the rail temperature by using thermal insulation materials. To this end, the temperature reduction performance, durability, and applicability of paint-type and fabric-type thermal insulation materials were reviewed. Specifically, the temperature reduction effect according to the applied thickness of the insulation material was analyzed, and the long-term durability performance was evaluated for environmental factors that may be exposed when applied to the railroad site. In addition, through field performance evaluation, the temperature reduction performance and applicability to actual railroad tracks were confirmed. As a result, both paint and fabric-type materials showed very good temperature reduction performance, and fabric-type thermal insulation materials compared to paint-type materials showed excellent applicability in terms of fabrication quality and workability. In the future, it is expected that the results of this study will contribute to improving the safety of railroad operation in summer.