In the railway track system, the KPO fastener system plays a vital role. As a key component connecting rails and sleepers, it is of great significance to ensure the safety and stability of railway operation.
The KPO fastener system is usually composed of gussets, threaded spikes, spring washers, iron seats and buffer pads. The gussets are used to buckle the rails and fix the rails tightly on the sleepers; the threaded spikes are anchored in the reserved holes of the concrete sleeper support platform through cement mortar to provide stable support for the entire system; the spring washers play a role in preventing loosening, effectively preventing the loosening of components caused by the vibration generated by the train operation; the iron seats are used to carry and transfer loads; the buffer pads can buffer the impact force generated by the train operation and reduce damage to the sleepers and rails.
Its working principle is based on the synergy of various components. The gussets tightly buckle the rails, limit the longitudinal and lateral movement of the rails, and maintain the stability of the track gauge. The threaded spikes are firmly anchored in the sleepers and transfer the load from the rails to the sleepers. The spring washer always keeps the pressure on the gusset plate to prevent it from loosening. When the train passes, the buffer plate absorbs and disperses the impact force, reducing the fatigue damage of the track structure.
| KPO fastening system | ||||||
| KPO clamp | Screw spike | HS bolt | Hex nut | spring washer | Base plate | |
| Pieces required | 4 | 8 | 4 | 4 | 8 | 2 |
| Material | Q235 | Grade 4.6: Q235 Grade 5.6: 35# Grade 8.8: 45# | Grade4.6: Q235 Grade5.6: 35# Grade8.8: 45# | Grade 5: 35# Grade 8: 45# | 65Mn | Casting iron QT500-7, QT450-10, or forging low carbon steel or high carbon steel; |
| Type; | KPO3, KPO6, KPO9 | M24X150mm M24 x160mm M24 x180mm | HS26, HS32 | As ordered | As ordered | UIC54,UIC60, 50kg rail, 60kg rail,S49 in ordered size |
| NOTE | Standard: DIN5906 | Standard: ISO898-1, UIC864-1 and NF F500-50 | Diameter: 22mm or 24mm. Length: 55mm, 65mm, 75mm, 90mm | Standard: DIN985 | Standard: UIC864-3 | Standard: UIC864-6 |
The KPO fastener system is widely used in various types of railway tracks, including ordinary railways and high-speed railways. On ordinary railways, it can meet the fastening needs of daily train operation and ensure the safe operation of trains. In the field of high-speed railways, facing the huge dynamic effect generated by high-speed trains, the KPO fastener system relies on its excellent performance to ensure the stability of the track structure and provide solid protection for the smooth operation of high-speed trains. For example, on some busy railway trunk lines, the KPO fastener system has withstood the test of long-term high-intensity use and demonstrated good reliability.
Compared with other types of fastener systems, the KPO fastener system has significant advantages. In terms of stability, its unique structural design and component combination can provide strong buckling pressure and pull-out resistance, effectively resist the effects of various forces during train operation, and ensure the stability of the track. In terms of durability, the system is made of high-quality materials, and each component has been specially treated to have good wear resistance and corrosion resistance. It can work stably for a long time in harsh environments, greatly extending the service life of the track and reducing maintenance costs.