Oliynyk O. Scientific bases of designing symmetrical turnout switches under safety requirements for wheels movement within the allocated switch blades

The dissertation deals with solving the scientific problem of designing symmetrical turnout switches under safety requirements for wheels movement within the allocated switch blades by developing a new method of calculating rational geometric parameters, which enabled the reduction of the practical length of switches and their metal content while ensuring train safety. The calculation-theoretical method solves the problem of determining the elastic-rigid parameters of the rail track in the vertical plane within the symmetrical turnout switch and on their basis the force load and stress-strain state of the rail threads along its entire length has been determined by means of the theoretical calculations. The results of the calculations allowed to estimating the distribution of dynamic forces, stresses and strains along the length of the turnout switch, which is the basis for establishing the allowable speeds of running under appropriate operating conditions. Experimental researches of vertical inequalities at crosspieces of turnout switches for conditions of the Kyiv underground of structures of types P50 and P65 of brand 1/9 have been carried out, character of their formation depending on the passed tonnage has been investigated, and average values of vertical inequalities have been received. Theoretical calculations determine the vertical dynamic forces of interaction of the system "wheel-rail" on the rolling surface of the crosspieces of types P50 and P65 brand 1/9, which allows on the basis of the obtained values of dynamic forces of interaction to determine the allowable speeds of trains running on the structure.