Verification of the Effectiveness of a Floating Track Slab System After 20 Years of Service

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Verification of the Effectiveness of a Floating Track Slab System After 20 Years of Service

Töll, Hanno / Achs, Günther / Kuttelwascher, Christoph / Mach, Michael / Dold, Mirko

Abstract In 2015, verification tests on the effectiveness of a floating track slab system after 20 years of service were carried out in the Römerbertunnel, Austria. The verification-test campaign included a visual inspection of the discrete bearings, of the shear key stabilization for longitudinal displacement, and of the lateral bearings. Furthermore, a test set up according to DIN SPEC 45673-3 in order to verify the natural frequency and the insertion loss of the floating track slab system was carried out. The visual inspection of the system indicated very good condition. The bearings were in correct position and no abnormal distortions or deformation of the bearings were identified. The insertion loss of the floating track slab system measured in situ was referred to a ballasted track located next to the 192 m long floating track slab system section, demonstrating that the effectiveness of the system is even better than the predicted insertion loss during the design phase of the system track. According to the verification tests, the in situ measured natural frequency of the floating track slab system shows good compliance with the theoretical tuning frequency of the system. Based on the measured and inspected results, the effectiveness of the floating track slab system can be verified. The vibration mitigation behavior is still as good as predicted during the design of the system and thus complies with all requirements of Austrian Federal Railways.