Structural Design and Installation Accuracy of the Holder Plate
- How does the structural form of the pressing plate affect the lateral binding force?
L-shaped pressing plates have large lateral binding force, and their vertical parts can effectively block the lateral movement of rails, suitable for curve sections or lines with large vibration. Flat pressing plates have a simple structure and relatively small lateral binding force, suitable for straight sections or areas with small stress. Pressing plates with anti-skid teeth increase friction through the engagement between teeth and the bottom of the rail, further improving lateral binding force, and are widely used in heavy-haul railways.
- What is the basis for selecting the thickness of the pressing plate?
The thickness of the pressing plate needs to be determined according to the rail type and line load. The thickness of the pressing plate supporting 60kg/m rails is generally 16 - 20mm, which can bear large lateral force. The thickness of 50kg/m rail pressing plates can be 12 - 16mm to meet basic binding requirements. Insufficient thickness will cause the pressing plate to deform and lose its binding effect; excessive thickness increases cost and may affect the cooperation with other components.
- What is the allowable range of position deviation when installing the pressing plate?
The deviation between the center line of the pressing plate and the center line of the rail should not be greater than 3mm. If the deviation is too large, it will cause uneven stress on the pressing plate and affect the lateral binding effect. The gap between the pressing plate and the bottom of the rail should be controlled within 0.5mm to ensure close contact and avoid rail shaking. The installation height deviation is not greater than 2mm to prevent interference between the pressing plate and sleepers or other components.
- What are the differences in the size of pressing plates corresponding to different rail types?
The length of pressing plates supporting 38kg/m rails is generally 100 - 120mm, and the width is 60 - 70mm; the length of 50kg/m rail pressing plates is 120 - 140mm, and the width is 70 - 80mm; the length of 60kg/m rail pressing plates is 140 - 160mm, and the width is 80 - 90mm. The size difference is to adapt to the bottom width and stress requirements of different rails, ensuring the effectiveness of binding.
- How to ensure the stability of the pressing plate after installation?
Check the quality of pressing plates and bolts before installation to ensure no deformation or cracks; the bolt tightening torque meets the requirements (such as 100 - 120N·m) to prevent loosening; apply anti-skid agent on the contact part between the pressing plate and the sleeper to increase friction; regularly check the position and fastening state of the pressing plate, and adjust in time if loosening or displacement is found to ensure long-term stable binding of the rail.