Rail fastening system

The superstructure K and its advanced variant, the superstructure KS, are standardized types of fastening of rails on sleepers (see permanent way (railway) ).

Superstructure K

It was developed superstructure K in Germany in 1925, first built 1926. The rail suspended for the superstructure K with a poplar liner (now through an existing plastic interlayer ( ZW) replaced) on a steel plate-fin whose ribs they lead the side and by their shape the transverse inclination of the track ensured. As a rule the rails to match the tapered treads of the wheels on the track 1:40 are inclined inwards, while they are perpendicular to simplify the construction in switches and crossings, especially. In the past, the rule inclination was at wooden sleepers 1:20, but this is available only in a few old tracks. In concrete sleepers, the inclination is usually incorporated into the threshold. Hook bolts are pushed laterally into dovetail recesses of the ribs and serve with nut and spring washer clamping plates to screw on top of the rail. Depending on the load, the rib plate is connected to two or four rail screws to the wooden or concrete sleeper. Plastic anchors (formerly wooden dowels ) are for recessed into the concrete sleepers. In steel sleepers a special ribbed plate (" ribs shim " ) is welded to the threshold.

To attach a rail in such a way on a concrete sleeper, 26 small parts are needed with 17.2 kg of steel.

Superstructure KS

When superstructure KS occurs a tension clamp to the point of clamping plate and snap ring. Also a washer is installed between the tension clamp and the nut. There are so per fixing point 26 small parts needed. The hook bolt has a square shank to prevent twisting of the hook bolt during tightening, as the tension clamp the hook screw does not prevent.