Design and Checking Calculation of No.9 Single Turnout with Movable-point Frog for 60 kg/m Rail for Urban Rail Transit
At present,the vibration in turnout area of urban rail transit mainly comes from fixed frog.Therefore,there is a demand for research and development of No.9 single turnout with movable-point frog for 60 kg/m rail for urban rail transit,to reinforce the vibration reduction.By studying the general layout scheme of No.9 single turnout with movable-point frog,it is proposed that the total length of the turnout is 30,950 mm and the radius of lead curve is 200 m.The switch rail adopts 60AT2 rail type,the wing rail adopts special section wing rail,and the point rail adopts double-arm elastic bendable structure with staggering device.Based on the 25 kN/mm fastening joint stiffness,the homogenization design and calculation of the stiffness in the turnout area are carried out,and the maximum longitudinal stiffness change rate is reduced from 140％to 112％.Through checking calculation of the switching force of turnout switch rail and point rail,under normal maintenance conditions,the theoretical switching forces of 1st and 2nd traction points of switch rail are 0.893 and 2.547 kN respectively,and the theoretical switching force for the traction point of point rail is 1.910 kN.The CWR turnout is subject to checking calculation with ballastless turnout as the working condition.Within the rail temperature variation range of 50 ℃,all indicators of No.9 single turnout with movable-point frog for 60 kg/m rail meet relevant requirements.
urban rail transitturnoutmovable point railfrogstructural designchecking calculation
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