Construction method of intersection position model for 3D route selection of highway or railway

Abstract

The present invention discloses an intersection position model construction method for three-dimensional highway or railway route selection. Planar mileage is used as a link to combine a horizontal curve intersection model and a longitudinal section grade change point model, so as to realize simultaneous optimization of horizontal and longitudinal sections. The method is applied to automatic design of trend lines and three-dimensional lines. According to the method, the number of horizontal and longitudinal intersections is automatically determined rather than that the number of intersections is manually specified; positions of planer intersections and longitudinal section grade change points are automatically determined; no special requirements are imposed on an initial parameter; integer values of curve radii and easement curve lengths of horizontal curves and longitudinal curves can be automatically calculated; a spatial position of the trend line or the three-dimensional line of the highway or railway is determined. This method is simple, convenient and practical, thereby having high promotional value.

Description

technical field [0001] The invention belongs to the field of three-dimensional automatic line selection, in particular to a method for constructing an intersection position model for three-dimensional line selection of roads or railways. Background technique [0002] With the development of computer technology, road (railway) route selection is gradually intelligent and automated. According to the basic direction and main technical standards of the highway (rail) road, realize the automatic design of the plane and longitudinal section of the railway or highway at the same time. Since the 1960s, a large number of scholars have carried out in-depth research on the theory and methods of railway digital route selection. At present, the design of railway digital route selection, which is mainly characterized by graphic interactive design, has changed the design appearance, making traditional design methods and means Major changes have taken place, shortening the design cycle, sa...

AI Technical Summary

Problems solved by technology

[0003] However, the existing three-dimensional space intelligent line selection models of highways (railways) at home and abroad have the following defects in determining the intersection points and slope change points: (1) The number of horizontal curve intersection points and the longitudinal section between the given start point and end point The number of slope change points (intersection points of longitudinal sections) is fixed, but this fixed setting is not suitable for topography and geological conditions; (2) The vertical curves and plane curves of the longitudinal section are set in one-to-one correspondence, but in actual projects, vertical curves and horizontal curves are set in correspondence with each other. The position of the horizontal curve should be determined according to many factors such as terrain and geology, and there is no absolute relationship between the two; (3) The main design parameters cannot change with terrain changes, for example, when the radius adopts the minimum radius determined by vehicle speed and superelevation, it is fixed setting

The existence of the above-mentioned problems makes it difficult to apply automatic line selection in practice.

Images