The use of floating slabs under the turnouts was required for noise and vibration mitigation. The designed floating slab consists of a continuous reinforced concrete slab supported by individual resilient bearings. It covers the complete width of the turnout.
The discrete resilient bearings are bonded to a fibrocement panel. These fibrocement panels are placed on the tunnel invert with the bearing surface in direct contact with the tunnel invert. They are lost formwork panels on which the track slab is poured.
Although the resilient bearings are isotropic, i.e. no horizontal bearings are required for normal operation, lateral stop bearings are added in order to avoid exaggerated displacement in accidental conditions such as earthquake or derailment.
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