High speed WJ-8 rail fastening system is designed for ballastless track with shoulder. It is composed of screw spike, flat washer, elastic rail clip, rail insulator, rail gauge block, rail tie plate, rail pad, and rail plastic dowel. Besides, rail adjustable pads are required because of steel rail position adjustment. WJ-8rail fastening system is a non-separated rail fastening system with a tie plate. The concrete sleeper or rail ditch is provided with a concrete shoulder. The load from train transfer from the rail tie plate and the gauge block to the concrete shoulder, which reduce the effect of lateral load, so that the structure is more stable.
Rail clip for WJ-8 rail fastening system can be classified into two types: W1 type rail clip for common section and X2 type rail clip for bridge. The diameter of the W1 type rail clip is 14 mm and the diameter of the X2 type is 13 mm.
As for the rail pad, there are two types for different application. Rubber tie plate is generally applied to the common section. When the train passes bridge, it needs to reduce the track resistance, and adopts X2 type rail clip equipped with composite pad. At this time, each set of rail fastening system has 4 KN longitudinal resistance of rail.
Rail gauge block is used to withhold the rails and adjust the gauge as needed. It can be applied in two places: common section and rail connections. Rail gauge block for common section is divided into 11 sizes: No.2, No.3, No.4, No.5, No.6, No.7, No.8, No.9, No.10, No.11, and No.12. No7 is used for standard rail gauge, No.10, No.11, No.12 can be used for rail connections.
Rail insulator type usually includeⅠandⅡ.Ⅰtype rail insulator is used in the common section and Ⅱtype is used in the rail connections.
The resilient pad under tie plate ca n be divided into type A and B. Type A is applied to railway for both passenger and cargo. And type B is mostly for passenger railway.
Screw spike has S2 and S3 type, when rail increase is less than 15 mm, use type2, on the contrary, use S3 type.
Rail plastic dowel is pre-embedded in railway sleeper or track slab. Embedded precision should meet the requirements, and top of plastic dowel is even with railway sleeper or track slab. After rail plastic dowel is laid, cover the plastic (or other material) to prevent rain and mud.
Rail adjustable pad and tie plate adjustable pad are two kinds of adjustable pads in the WJ-8 rail fastening system. Rail adjustable pad is placed between rail pad and tie plate, it can be divided into 4 standards by thickness, including 1mm, 2mm, 5mm and 8mm. tie plate adjustable pad is placed between Resilient pad and railway sleeper (or track slab), it has two standards like 10mm and 20mm. Tie plate adjustable pad is made up of two pieces, they are generally used in pairs.