Customized Design of External Standard Rail Size Adaptation and Fastener System
What are the core differences in profile design between European/American standard rails and standard Chinese rails?
The rail head profile of standard Chinese rails is a standard conical shape, which adapts to the domestic wheel-rail matching mode; European standard rails have wider rail heads and larger rail base widths, and American standard rails have a gentle rail head profile. Their profile parameters will lead to poor fit between conventional fasteners and rails, failing to provide sufficient transverse and vertical constraints.
Why do customized designs are required for pressing plates and gauge blocks when laying foreign standard rails?
Customized pressing plates need to match the rail base width and profile of foreign standard rails to ensure sufficient contact area; gauge blocks need to adjust the thickness and tooth shape according to the transverse size of rails, otherwise rail transverse displacement and gauge deviation will occur, destroying the stability of track geometry.
What special requirements do foreign standard rails have on the specifications of bolts and spikes?
Bolts matched with foreign standard rails need to adapt to their joint aperture and installation spacing; the length and diameter of spikes need to match the sleeve specifications of foreign standard sleepers. Conventional standard Chinese fasteners cannot meet the installation strength and positioning accuracy requirements, and problems such as loosening and anchoring failure are likely to occur.
What is the matching principle of foreign standard rails and under-rail pads?
The width and thickness of under-rail pads must be strictly corresponding to the rail base size of foreign standard rails; the stiffness of pads needs to be adjusted according to the bearing characteristics of foreign standard rails. Heavy-duty foreign standard rails need high-compression and creep-resistant pads to avoid pad deformation or crushing affecting track stability.
What are the core control points for customized fasteners of foreign standard rails in overseas projects?
Take the official technical standards of foreign standard rails as the basis to carry out three-dimensional modeling and mechanical simulation of fasteners; make samples for matching tests to verify the fit, clamping force and bearing performance; complete all-round testing before mass production to ensure the adaptability and safety of customized fasteners and foreign standard rails.