Partners: Russian Railways JSC., Plastic Processing Plant n.a. “Komsomolskaya Pravda” LLC., Institute of Polymers LLC., Saint Petersburg State Transport University, Central Research Institute of Materials CJSC, Chudo-Yarmarka LLC., BIC LLC., Plastic Processing Company n.a. “Komsomolskaya Pravda” JSC, Gummilat RTI LLC. and others.
The usage of pads as a layer on the bottom of ferroconcrete beams/sleepers allows to reduce vibrodynamic effects which impacts to ballast; and also due to stated pad toughness we have the same ballast resilience at all pointwork and as a result we can reduce the pointwork parts wear.
Functions of under sleeper pads:
- Reduction of dynamic vibration impact due to additional resilient gasket with stated toughness;
- Sticking ballast parts adjoin more tightly to the shock absorber surface that prevents them from intense wearing and splitting as in case of their direct contact with the lower surface of the ferroconcrete sleeper;
Moreover, under sleeper pads increase sleeper sheer resistance across the track.
Against Russian Railways JSC order the Polymer Cluster enterprises have designed under sleeper pads, lay-up scheme (according to product thickness) for beam bottom of high-speed pointwork with the right and left access tracks according to project No. 2956, as also assembly and installation standards for under beam pads.
The results obtained during R&D work show that the installed under sleeper pads reduce vibration action to ballast layer to 30-50% on different high-speed pointwork areas, and to 40-60% on tangent track; track elastic properties are increased, and as the result of it we can say that installed under sleeper pads can increase the pointwork lifetime up to 25-30%.
Plastic Processing Plant n.a. “Komsomolskaya Pravda” LLC. has put a serial production of under sleeper pads. The Plant has delivered a pilot batch of under sleeper pads for ferroconcrete beams of 9 pointworks to the Russian Railways JSC. directorate enterprises.