Volume 23 Issue 3
Jun.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(3): 114-126
WANG Pu, WANG Shu-guo, WANG Meng, ZHAO Zhen-hua, SI Dao-lin, MA Si-yuan, SUN Zhao-liang. Number selection and structural optimization of 400 km·h-1 high-speed turnout[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 114-126. doi: 10.19818/j.cnki.1671-1637.2023.03.008
Citation: WANG Pu, WANG Shu-guo, WANG Meng, ZHAO Zhen-hua, SI Dao-lin, MA Si-yuan, SUN Zhao-liang. Number selection and structural optimization of 400 km·h-1 high-speed turnout[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 114-126. doi: 10.19818/j.cnki.1671-1637.2023.03.008
shu

Number selection and structural optimization of 400 km·h-1 high-speed turnout

doi: 10.19818/j.cnki.1671-1637.2023.03.008
  • 1.

    Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd., Beijing 100081, China

  • 2.

    CARS (Beijing) Railway Equipment Technology Co., Ltd., Beijing 102202, China

  • 3.

    Postgraduate Department, China Academy of Railway Sciences, Beijing 100081, China

  • 4.

    Zhuzhou Times New Material Technology Co., Ltd., Zhuzhou 412007, Hunan, China

Funds:

National Natural Science Foundation of China 51878661

Science and Technology Research and Development Project of China State Railway Group Co., Ltd P2021G053

Major Project of China Academy of Railway Sciences Co., Ltd 2022YJ177

More Information
  • Author Bio:

    WANG Pu(1988-), male, associate researcher, PhD, wpwp2012@yeah.net

    WANG Shu-guo(1974-), male, researcher, PhD, zzddxx4473@sina.com.

  • Received Date: 2022-12-21
    Available Online: 2023-07-07
  • Publish Date: 2023-06-25
    Abstract
  • According to the demand for further improving the operating speed of high-speed railways in China, the number selection and structural optimization methods of a 400 km·h-1 high-speed turnout were studied systematically. Based on the vehicle-turnout coupling dynamics simulation, the correlation between turnout number and ride comfort was analyzed, and the suggestions for number selection were given. The influence of turnout linetype on the dynamics performance was studied, the principle of utilizing existing turnout sleepers was considered, and a linetype optimization scheme was proposed. A prototype test platform for the switch rail conversion of the No.18 KEZHUANXIAN turnout was established. The influencing factors and mechanisms of insufficient switch rail displacement were studied, and a control method of the insufficient displacement was proposed. A calculation model of track stiffness in the turnout area was established based on the finite element theory. According to on-site measured data of rail dynamic displacement in the turnout area, a target value and a homogenization scheme for track stiffness were proposed. Research results indicate that under the condition of the existing station layout plan, it is recommended to choose the No.18 turnout as the 400 km·h-1 high-speed turnout. The mutual distance of the 400 km·h-1 high-speed turnout can be increased to 28 mm, which can significantly improve the wear resistance and service life of the switch rail and can utilize the existing turnout sleepers. By comprehensively considering the system matching design, manufacturing process, combination requirements of track maintenance and electrical divisions, and other factors, it is recommended to reduce the distance from the third traction point to the fixed end by 600 mm, which can reduce the insufficient switch rail displacement. At the same time, the minimum flangeway and the traction force of the third traction point meet the code requirements. In addition, the structural design method of high-speed turnout crossings should be improved, in which the elastic deformation state of the point rail should be determined according to the actual forces, and the connectors and point rail conversion should be designed on this basis. It is also recommended that the target stiffness of the turnout area should be reduced from 25±5 kN·mm-1 to 23±3 kN·mm-1.

     

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