The Technical Parameters Selection Of Expressway Interchange Alignment Design

Design of highway interchange generally applied in the design of standard now, the running speed of the vehicle and the actual terrain considering depth is not enough, lack of flexibility on linear selection of technical indicators, part of interchanges project is too large, and environmental damage, such as rare interchanges has become the importance of traffic safety hidden trouble, influence highway overall service level, failed to make full use of limited construction capital and land resources. For more rational selection of technical parameters of interchange design new concept is applied to the engineering practice, this article is the key technology in the design of linear parameter analysis and demonstration, and puts forward the main technical index of reference.In this article, through many areas of the country’s interchanges engineering example research, selection of the main technical parameter, analysis of the current interchanges in the design of linear main existing problems. Paper through the analysis on the basis of domestic interchanges data, combined with some representative meaningful design and operation of the interchanges, focuses on analyzing the influence factors of interchanges alignment design indexes, deeply analyzes the interchanges linear indicators and traffic safety, the relationship between the amount of land.Through theoretical analysis and calculation of the vehicle on the ramp and speed change lane operating speed variation, combined with around the design experience of the case, according to the principle of safety design, environmental design, at home and abroad of the new design concept, interconnection research of design of main technology index selection principles and application conditions, and puts forward the main technical indexes of the reference value.Finally, the paper is based on the actual running speed of the vehicle, and verifies the running speed coordination. Through the interchange instance, the coordination of running speed, running speed and design speed are verified, and whether the alignment index is appropriate and the guarantee of the alignment is more scientific and reasonable.