FFU Synthetic Sleeper I Railway Technology

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Pulsatory fatigue test in ballast bed following DIN EN 13230-3 Sleeper screw extraction test FFU synthetic sleeper after impact test After two impact tests conducted on the same section of the sleeper, the FFU synthetic sleeper merely showed the impression of a wheel flange. The FFU sleeper retained its stability even after this derailment simulation and thus guarantees the retention of the track gauge. The electrical resistance tests conducted on FFU resulted in a value of R33 = 71.9 kΩ. The requirement of R33 ≥ 5 kΩ was maintained with certainty, confirming the high electrical insulation of FFU synthetic sleepers. During static testing in the centre of an FFU sleeper, a force of 240 kN was deflected without any damage to the sleeper. By comparison, a wooden sleeper failed by breaking at only 80 kN. The deflection of the FFU sleeper was continuously recorded here by four gauges. The fatigue test was carried out under exceptionally critical test conditions in the middle of the sleeper and only showed a slight change of 0.4mm after 2.5 million load cycles. There were no perceptible signs of fatigue. When carrying out the static compressive test, a load of 300 kN was applied to the FFU sleeper through the rail and rail fastening. In this test a plastic deformation of only 0.8 mm was measured. To analyse behaviour at low temperatures, FFU sleepers were put into storage at -20°C. The ensuing test showed that, even at extremely low temperatures, the fibres of FFU synthetic wood remain free of brittleness. The fatigue test under the sleeper bed was performed in the most unfavourable conditions such as poor track geometry, uneven distribution of loads through the rails, stiff rail seat section and a high dynamic allowance for an axle load of 250 kN. Without exception, no damage of any kind was observable on the FFU sleepers, even after two million load cycles. 8
Repair method with synthetic resin only - curing time 30 minutes Profiling Cleaning bore hole Adding synthetic resin Drilling new hole Inserting screw Repair method with FFU synthetic wood dowel - curing time 4 hours Cleaning bore hole Adding synthetic resin Sealing off Drilling new hole Inserting screw Repair Methods In case bore holes are misplaced or drilled in an inaccurate size during on site-work on the FFU sleepers, the FFU synthetic wood technology offers two different quick and easy repair methods without affecting the quality of the material. Using the first method, the defective bore hole is re-profiled, cleaned and then filled with liquid synthetic resin. After a curing time of just 30 minutes, a new bore hole can be drilled in the correct position a few millimetres away, and the originally intended screw connection made. Using the second method, the defective bore hole is cleaned and similarly filled with liquid synthetic resin. A FFU synthetic wood dowel is then inserted. With this method curing takes about four hours until a new bore hole can be drilled at the repaired spot. 9
Page 1 and 2: FFU Synthetic Sleeper I Railway Tec
Page 3 and 4: Annual Turnover SEKISUI Chemical Co
Page 5 and 6: Fiber reinforced Foamed Urethane Pr
Page 7: Static compressive test Load introd
Page 11 and 12: Sawing slot Mortice slot Bore hole
Page 13 and 14: In 2010 a considerable number of ra
Page 15 and 16: Drilling of bore holes Rail fasteni
Page 17 and 18: Railway Crossings In the past, rail
Page 19 and 20: Detail Calmmoon Rail Transition sec

FFU Synthetic Sleeper I Railway Technology

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