Knowledge

The longitudinal resistance of fasteners is the core indicator for preventing rail creep. Insufficient resistance can lead to rail slippage, uneven ra

Urban rail transit features numerous small-radius curves, short station spacing, and frequent acceleration and deceleration. Fasteners are subjected t

During heat treatment, electroplating, and other processes, bullet clips may absorb hydrogen atoms, leading to material embrittlement. Under static st

Fastener gap defects in ballastless track refer to localized gaps between the elastic strip and the rail base, or between the pad and the sleeper. The

When there is oxide scale, rust, oil, or dust on the rail base, it will change the friction state between the elastic clip and the rail base, leading

Tilting, misalignment, and uneven gaps during track gauge block installation directly alter the support point and force path of the spring clip, causi

Shot peening involves applying high-speed shot to the surface of rail clips to form a residual compressive stress layer, which effectively inhibits th

During installation, residual sand, iron powder, concrete debris, and other impurities can become embedded in the fastener contact surfaces, causing a

During curing and long-term service, anchoring agents may shrink, develop microcracks, and pulverize, leading to decreased grip strength, insufficient

Side wear of outer rail on small radius curves is a typical track defect. Its development process is mutually reinforcing with the deterioration of la

The tightening sequence of joint bolts directly affects the fit between the fishplate and the rail, as well as the distribution of bolt preload. Incor

The dynamic-static stiffness ratio is a core indicator for evaluating the vibration reduction performance of rail pads. An excessively high ratio will