Methodic for evaluating the performance of a continuous welded track according to the criterion of compliance of the actual rail fastening temperature with the standardized value

Problem of safety evaluation of continuous welded track operation is considered. A comparative analysis of the current assessment methods is carried out and a method is proposed for identifying dangerous track sections according to the criterion of compliance of the actual rail fastening temperature with the standardized one. Under the actual fxing temperature in the article, the temperature of the rail is taken at which, as a result of its thermal expansion or contraction, a zero value of the longitudinal force is formed in it. A method is presented for calculating the actual temperature of rail fastening using the dependence of the natural frequency of rail vibrations on the applied longitudinal force, which was obtained by the computational method using the fnite element model of the track section created by the authors by means of modal calculations for various values of the longitudinal force applied to the rail. Its verifcation was carried out using experimental data obtained as a result of testing at a specialized stand. The method of tests carried out on the stand and section of the continuous track of the Ozerskaya branch of the Moscow Railway is described, which consists in determining the natural frequency of the first mode of rail vibration at different values of the longitudinal force, and in the case of field tests at different values of the rail temperature. The calculation of the actual temperature of rail fastening is given on the example of a section of a continuous-welded track of the Ozerskaya branch of the Moscow railway. It was found that the temperature of rail fastening on the investigated section corresponds to the normative for the given region.

1. Bromberg E.M. Perspektivy i problemy razvitiya besstykovogo puti na zheleznykh dorogakh SSSR [Prospects and problems of the development of continuous welded track on the railways of the USSR]. Trudy VNIIZhT [Proceedings of VNIIZHT]. Moscow, Transzheldorizdat Publ., 1962, issue 244, pp. 5‒18.

2. Zverev N.B. Eksperimental'noe issledovanie raboty besstykovogo puti [Experimental study of the continuous welded track operation]. Trudy VNIIZhT [Proceedings of VNIIZHT]. Moscow, Transzheldorizdat Publ., 1962, issue 244, pp. 46–60.

3. Bromberg E.M., Zverev N.B. Besstykovoy put' v krivykh [Continuous welded track in curves]. Moscow, Transport Publ., 1968, pp. 3‒31.

4. Bromberg E.M. Ustoychivost' besstykovogo puti pod poezdami [Stability of the continuous welded track under trains]. Sovershenstvovanie konstruktsii i ekspluatatsii besstykovogo puti. Tr. VNIIZhT [Improvement of the design and operation of the continuous welded track. Proc. of VNIIZHT]. Moscow, Transport Publ., 1988. pp. 13‒20.

5. Pershin S.P. Metod rascheta ustoychivosti besstykovogo puti [Method for calculating the stability of a continuous welded track]. Trudy MIIT [Proceedings of MIIT]. Moscow, 1962, issue 147, pp. 28–97.

6. Karpushchenko N.I., Osipov V.G., Grishchenko V.A. Problemy i perspektivy razvitiya besstykovogo puti [Problems and prospects of the development of continuous welded track]. The Siberian Transport University Bulletin, 2010, no. 22, pp. 23–34.

7. Instructions for the arrangement, laying, maintenance and repair of a continuous welded track to ensure the strength and stability of a continuous welded track. Approved by order of JSC Russian Railways dated December 14, 2016 No. 2544r, 185 p. (in Russ.).

8. Gapanovich V.A., Mikhalkin I.K., Simakov O.B. Kompleksnaya otsenka sostoyaniya besstykovogo puti [Complex assessment of the state of continuous welded track]. Zheleznodorozhnyy transport, 2015, no. 9, pp. 24–27.

9. Pavlenko V.V. Sistema opredeleniya predotkaznogo sostoyaniya besstykovogo puti dlya obespecheniya bezopasnosti dvizheniya poezdov [System for determining the pre-failure state of a continuous welded track to ensure the safety of train traffc]. Transport Rossiyskoy Federatsii, 2011, no. 5, pp. 31–33.

10. Bidulya A. L., Volokhov G. M., Ovechnikov M. N., Panin Yu.A., Ponomarev A.S., Chunin S.V., Shabunevich V.I. Sposob opredeleniya napryazhenno-deformirovannogo sostoyaniya razlichnykh uprugikh ob"ektov [Method for determining the stressstrain state of various elastic objects]. Patent no. 2670723, Rossiyskaya Federatsiya [Russian Federation], MPK G01L1/00 (2006.01), publ. 15.11.2018, 9 p. (in Russ.).

11. GOST 10629–88. Prestressed reinforced concrete sleepers for 1520 mm gauge railways. Specifcations. Interstate standard, approved and put into effect by the decree of the State Construction Committee of the USSR dated November 21, 1988 No. 228. Moscow, IPK Publishing house of standards, 2004, 16 p. (in Russ.).

12. GOST 16277–93 (ISO 6305-2-83). Plates of separate fastening for railway Р50, P65 and Р75 rails. Specifcations. Interstate standard, adopted by the Interstate Council for Standardization, Metrology and Certifcation on October 27, 1993. Moscow, Standartinform Publ., 2006, 20 p. (in Russ.).

13. GOST R 56291–2014. Rail fasteners pads of railway. Specifcations (as amended). National standard of the Russian Federation. Moscow, Standartinform Publ., 2015, 32 p. (in Russ.).

14. GOST R 51685–2013. Railway rails. General specifcations (with Amendment No. 1). National standard of the Russian Federation. Moscow, Standartinform Publ., 2014, 102 p. (in Russ.).

15. Chunin S.V., Shabunevich V. I., Savos'kin A. N. Eksperimental'noe issledovanie sobstvennykh chastot i form kolebaniy rel'sa [Experimental study of natural frequencies and forms of the rail oscillations]. Vestnik VNIIZhT [Vestnik of the Railway Research Institute], 2020, Vol. 79, no. 3, pp. 154–160. DOI: https://doi. org/10.21780/2223-9731-2020-79-3-154-160.