WJ-2 Rail Fastening System (WJ-2 Fastener System)

Composition Description and structural features of Type WJ-2 type Rail Fastening System:
　　1) System composition
The fastener system consists of T-bolts, nuts, flat washers, spring clips, insulating blocks, iron pads, insulation cushioning plates, under-rail pads, anchor bolts, heavy-duty spring washers, flat cushions and dowels that positioning on concrete sleepers or rails. When adjusting the height of the rail, the height-adjusting pad (under rail and under iron pad) are used.
　　 2) Structural features
　　This fastener system is a non-shoulder elastic clips structure with iron pads, with the following structural features:
a) Concrete sleepers or track slab bearing grooves do not have concrete shoulders, and the iron pad is equipped with a 1:40 rail bottom slope. The concrete sleepers or track slab bearing surface is flat slope, which can be used for sleepers (double-piece sleepers, long Sleeper) buried ballastless track can also be used for track slab ballastless track. The lateral load transmitted by the train is mainly overcome by the friction force of the iron pad.
　　B) A rubber pad is set between the bottom of the rail and the iron pad to realize the flexibility of the system. By replacing the under-rail pads of different stiffness, it can be adapted to the operating conditions of 350 km/h passenger dedicated line and 250 km/h passenger dedicated line (taking into account freight) respectively.
　　C) T-bolt insertion seat and steel rail shoulder are provided on the iron pad, and the spring clip is tightened by tightening the nut of the T-bolt. The matching design of the elastic clip has a larger elastic range than the existing elastic clips in our country (all kinds of elastic clips are 14 mm), and the fatigue strength is high. When the elastic pad under the lower rigidity rail is used, the buckle pressure of the elastic clip is less attenuated.
　　D) There is an insulating block between the rail shoulder and the rail on the iron pad to improve the insulation performance of the fastener system.
　　E) An insulating cushion plate is set between the iron backing plate and the concrete sleeper or track slab to buffer the impact of the train load on the concrete sleeper or track slab, and at the same time improve the insulation performance of the system. Protruding ribs and drainage ports are arranged around the insulating pad, which can effectively increase the water film resistance.

Technical paramters of Type WJ-2 type Rail Fastening System:
1) The height adjustment of the fastener system is 40mm, of which the adjustment under the rail is 10mm, and the adjustment under the iron plate is 30mm.
2) The adjustment amount of the fastener gauge is 20mm, that is, ±10mm. The gauge is adjusted by moving the iron pad with long round holes, which is a continuous stepless adjustment.
3) The maximum lateral force of the fastener is 40kN (fatigue load).
4) The torque of the T-bolt and nut is 70 to 90 N·m.
5) The tightening torque of the anchor bolts is 300 Nm.
6) The pullout resistance of the embedded insulating sleeve is greater than 100 KN.
7) The resistance between the rail and the bearing table is greater than 108Ω.
8) The stiffness of the fastener node is 40-60 KN/mm.