Rationalization of diagnostic examination periods for metalwork elements of subway escalators

   Introduction. The main element of the subway escalator is a supporting metal structure, on which all elements, components and assemblies are installed, ensuring its functioning as a continuous lifting machine. The supporting metal structure must withstand not only its own weight and the total weight of the components and mechanisms attached to it, but also provide resistance to dynamic loads arising during their operation. The implementation of comprehensive diagnostic measures aimed at analyzing the level of wear and determining the residual life of escalator metal structures encounters a number of difficulties associated with high demands on time, material and financial costs, as well as disruption of the public transport system.

   The main goal of this study is to optimize the timing for recording the initial data obtained during the diagnostic examination of escalator metal structures with an obvious reduction in the duration of their forced downtime.

   Materials and methods. During the research process, data from a comprehensive survey of escalators based on the State Unitary Enterprise “St. Petersburg Metro” in the amount of 218 pieces in the period from 2005 to 2019 were used, design documentation, statistical methods and mathematical modeling methods were used.

   Results. The use of a mathematical model and the principle of rationalization can significantly reduce the time and, consequently, other costs in determining the corrosion effect.

   Conclusion. The use of the proposed approach to the rational allocation of time periods for conducting diagnostic examinations of operated escalator metal structures facilitates the preventive final forecast estimate of the magnitude of the corrosion effect while reducing the total period of control measures by 38%. The principle of rationalization can also be used in the implementation of accelerated tests for corrosion resistance of materials.

1. Dyatlov V.N. Modeling of the corrosion process of bearing metal structures of the subway escalator. Vestnik MADI. 2022; 1(68): 29–35. (In Russ.)

2. Kharlov M.V., Popov V.A. Technique for assessing the technical condition of the escalator. Internet-zhurnal Naukovedenie. 2017; vol. 9, no. 4. Available at: https://naukovedenie.ru/PDF/05TVN417.pdf (accessed 25. 07. 2024). (In Russ.)

3. Popov V.A., Yelantsev V.V. Increasing the efficiency and safety of operation of underground tunnel escalators. Management of risks. Izvestiya MGTU «MAMI». 2021. no. 3 (49), pp. 10-22 (in Russ.) doi: 10.31992/2074-0530-2021-49-3-10-22.

4. Elantsev V.V. To the question of improvement efficiency and safety operation of underground tunnel escalators. technical state forecasting algorithm. International journal of applied and fundamental research. 2021; 2: 32-41 (in Russ.)

5. Dyatlov V.N., Orlov S.V., Popov V.A. Combined Influence of Cyclic Loads and Corrosion on the Technical Condition of Metal Structures of Metro Escalators. World of Transport and Transportation. 2023; 21(4): 21–28. doi: 10.30932/1992-3252-2023-21-4-3

6. Sharav N., Szeinuk M., Shiftan Y. Does your city need a metro? – A Tel Aviv case study. Case Studies on Transport Policy. 2018; 6 (4): 537-553. doi: 10.1016/j.cstp.2018.07.002

7. Kazarinov N., Smirnov A., Petrov, Y., Gruzdkov A. Dynamic fracture effects observed in a one-dimensional discrete mechanical system. E3S Web of Conferences. 2020. 157. 01020. DOI: 10.1051/e3sconf/202015701020.Available at: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084111141&doi=10.1051%2fe3sconf%2f202015701020&partnerID=40&md5=ff349ae2159696f6435772713fca13e8 (assessed: 25. 07. 2024). DOI: 10.1051/e3sconf/202015701020.

8. Uzdin A., Prokopovich S. Some principles of generating seismic input for calculating structures. E3S Web of Conferences. 2020. 157. article № 06021. DOI: 10.1051/e3sconf/202015706021.Available at: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084111517&doi=10.1051%2fe3sconf%2f202015706021&partnerID=40&md5=2c52657ac32615f175abb033915b52dc (assessed: 25. 07. 2024).

9. Dyatlov V.N. Clarification of the model of development of corrosion defects of bearing metal structures of metro escalators. Vestnik MADI. 2022; 3(70): 46–50. (In Russ.)

10. Vatulin YS, Popov VA, Dyatlov VN. Technical diagnostics of the embedded elements of crane tracks of lifting equipment in machine halls of tunnel escalators. Izvestiya MGTU «MAMI». 2022; 16(3): 241–250. doi: 10.17816/2074-0530-106323

11. Yermilova A.V., Boudrina E.V. Innovative vector of development of effective strategy for tunnel escalator operating. Economics. Law. Innovation. 2020; 1: 57–64 (in Russ.)

12. Casals M., Gangolells M., Forcada N., Macarulla M., Giretti A., Vaccarini M. SEAM4US: Аn intelligent energy management system for underground stations. Appliedenergy. 2016; vol. 166: 150–164. DOI: 10.1016/j.apenergy.2016.01.029