1. [1] Railway Electrification Committee of Japan, "Concrete pole handbook," 1958 (in Japanese).
2. [2] Railway Bureau, Ministry of Land, Infrastructure, Transport and Tourism of Japan, "Ministerial Ordinance to Provide Technical Regulatory Standards on Japanese Railways," 2012.
3. [3] Japanese Industrial Standard, "JIS A 5373 Precast prestressed concrete products," 2016 (in Japanese).
4. [4] Ueda, H., Kudo, T., and Sasaki, T., "Deterioration Diagnosis and Maintenance of Concrete Poles," RTRI Report, Vol.18, No.10, pp.3-8, 2004 (in Japanese).
5. [5] Tsunemoto, M., Shimizu, M., Kondo, Y., and Yokouchi, K., "Flexural Strength Evaluation of Deteriorated Concrete Pole," J-RAIL2016, No. S2-1-5, 2016 (in Japanese).