Structural Design Scheme and Performance Analysis of Urban Rail Transit No.14 Turnout

［Objective］ Existing urban rail transit turnouts suffer from low lateral crossing speed, which adversely affects turn-back capacity. To enable 8-car A-type metro trains to achieve a capacity of 30 pairs per hour in the long term, it is necessary to design a turnout structure scheme that can meet high-speed crossing requirements, with a lateral crossing speed of up to 67 km/h. ［Method］ The research takes a No.14 turnout with a rail mass specification of 60 kg/m (hereinafter referred to as ′No.14 turnout′) as research object, and a structural design scheme for the No.14 turnout and its diamond crossing is proposed. Based on current relevant standards and specifications, the turnout conversion calculation theory is employed to perform switch rail conversion calculations for the proposed design scheme. A seamless turnout finite element model is established to conduct static simulation analysis for the design scheme of No.14 seamless turnout. ［Result & Conclusion］ The proposed design scheme meets the required control indicators for turnout conversion force, maximum allowable displacement, and minimum wheel flange groove width. Furthermore, the strength of the turnout rails, force transmission components, and longitudinal displacement of movable parts are all compliant with the specifications.