How does the rail under sleeper pad protect the sleepers?
Rail under sleeper pads are elastic components installed between railway sleepers and the track bed (ballast or concrete base). They are typically made of materials such as rubber, cork-rubber composites, or polyurethane, offering high elasticity, wear resistance, and anti-aging properties. They serve as a core component of the track structure's shock absorption and buffering system.
Three Key Functions of Sleeper Pads in Protecting Sleepers:
Cushioning Load Impacts to Reduce Sleeper Cracking and Damage
The wheel-rail loads generated during train operation are transmitted through the rails and fasteners to the sleepers. The elastic deformation of the pads effectively absorbs and disperses impact forces, preventing concentrated loads from acting on localized areas of the sleeper. This reduces the likelihood of cracks or fractures in the sleeper due to long-term stress fatigue, particularly mitigating damage to sleepers in heavy-haul railways and high-frequency commuter rail lines.
Reducing Friction and Wear to Extend Sleeper Lifespan
Vibrations caused by train movement can lead to relative displacement and friction between the sleeper and the track bed. The flexible material of the pads acts as a "buffer layer," reducing direct friction between the sleeper bottom and the ballast/concrete base. This helps prevent wear, chipping, or other damage to the sleeper bottom while also minimizing the loosening effect of vibrations on the connection between the sleeper and the track bed.
Balancing Stress Distribution to Prevent Localized Sleeper Crushing
The surface of the track bed may have certain flatness irregularities. The pads, through their elasticity, can fill gaps between the sleeper and the track bed, ensuring more even force distribution across the sleeper bottom. This prevents localized stress concentration that could cause crushing or spalling of the sleeper (particularly concrete sleepers), ensuring stable contact between the sleeper and the track bed and maintaining the overall precision of the track geometry.
The under sleeper pads are mainly used in special vibration-damping areas, such as tunnels, bridges and culverts, etc. The lower part of these sections is a rigid foundation, and the stacking height of the ballast is insufficient, resulting in insufficient track elasticity. Laying under sleeper pads under the railway sleeper can effectively solve the problem of insufficient elasticity.
As a professional under sleeper pads manufacturer, you are reminded that under sleeper pads and under-rail pads are indispensable parts for laying railways and are essential elements for ensuring railway safety. Choose under sleeper pads, must choose high quality under sleeper pads manufacturers.GNEE RAIL is always at your service.
Our EVA/HDPE/rubber rail pads are with high elasticity, applying to types for rails such as rail UIC54, UIC60, BS80lbs,BS100lbs, and sizes as ordered. The pads can be customized with or without grooves, in various possible designs, depending on customers' requirements.
| Raw Material | Rubber, EVA, TPEE, HDPE |
| Standard | UIC, AREMA, TB/T2626-95 |
| Application | 43kg/m, 50kg/m, 60kg/m, 75kg/m,115RE, UIC54, UIC60, S49 |
| Model number | 43-7-7, 43-10-7, 50-7-9, 50-10-9, 60-10-17, 60-12-17 |
| Operating temperature | -50~70 degrees |
| Certificate | MSDS, ROHS, REACH |
| Notes | They should be stored in a clean, ventilated place. Don't be in direct sunlight, and keep away from the heat source and chemical reagent. Don't touch the oil, organic solvent, and other chemicals. Banned exposure. |
