Fastening Systems

Bonded DFF ADH

The Bonded DFF ADH system has been developed for plain line and turnout applications to directly combat corrugation and vibration problems caused by major dynamic forces generated from passing trains.

The DFF ADH system is suitable for use on slab tracks, concrete sleepers, steel bridges, ballasted tracks and turnouts. The fastening system has two system variations available; a standard model for plain line tracks and customised models for turnout applications. The DFF ADH system can be constructed by either the top-down method or bottom-up construction and is adaptable to all types of slab.

Technical Features

  • Different anchor configurations are available utilising plastic dowel or cast inserts subject to operational requirements
  • Special variants for turnout areas such as for switches and crossings
  • Vibration isolation can be provided in a range of stiffness down to 7 kN/mm although a typical standard stiffness configuration would be around 25 kN/mm
  • The bonded resilience provides longitudinal, vertical and lateral stiffness
  • The system is adjustable laterally and vertically, typically +/- 12 mm laterally per rail seat and + 30 mm vertically

Advantages

  • The one piece bonded system comprises a top and bottom plate factory assembled by bonding using vulcanised rubber which provides very high levels of electrical resistance, long electrical leakage path and the lateral resilience which can minimise corrugation propagation
  • The complete factory-assembled baseplate in the DFF ADH system provides the opportunity to attach the system directly to the bridge superstructure or to the timber, concrete or steel bearer and provide a high level of adjustment to suit
  • Depending on the type of rail clip used on the DFF ADH system, structure interaction between the rail and the structure can be managed by low toe load and/or zero longitudinal restraint (ZLR) fastening options
Fastening Systems

Bonded DFF ADH

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