Undertie pads are effective for reducing structure borne noise and vibrations.
The D2S systems for ballasted track are superior to other systems. They include elastomer pads with a low dynamic to static spring rate which are protected by a rubber boot against damage from tamping operations.
Their vibration mitigation performance is drastically improved by the use of a rigid layer inside the boot. This rigid layer is inserted under the elastomer pad. It ensures a homogeneous load distribution in the elastomer and hence an optimal functioning of the elastomer. This homogeneous load distribution cannot be achieved by a single elastomer pad resting on ballast.
The D2S systems are used with wooden and concrete ties, in tangent track and with special trackwork (crossings, turnouts, …). They can be pre-installed on new ties or attached on site to existing ties.
The D2S booted undertie pads reduce the transmission of structure borne noise and vibrations with controlled rail displacements.
Performance:
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average vibration reduction of 10 dB in comparison with ballasted track, also when used with special trackwork
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controlled vertical and horizontal rail displacements (below 1, 2 or 3 mm depending on system specifications)
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long term performance due to protection by rubber boot
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