CGQZ series spherical steel bearings are a series of bridge bearings designed and developed for intercity and urban rail transit bridges, suitable for intercity rail transit engineering bridges with a speed of 200km/h or below and urban rail transit engineering bridges with a speed of 120km/h or below. Bearings are divided into CGQZ-J series spherical steel bearings, used for simply supported beam bridges; CGQZ-L series spherical steel bearings are used for continuous beams and other special bridge structures.