Calculating and setting-out method for large switchback curve of road used in Beidou mobile measurement equipment

Abstract

The invention discloses a calculating and setting-out method for a large switchback curve of a road used in Beidou mobile measurement equipment. The method comprises the following steps: for an intersection point, with circular curve rotation angles of more than 180 DEG C, of the large switchback curve, acquiring and determining coordinates of an imaginary intersection point, the radius of a circular curve, the circumferential length, tangent length and tangential bearing of a first easement curve, and the circumferential length, tangent length and tangential bearing of a second easement curve; and segmenting the circular curve in the large switchback curve into two sections so as to form two new circular curves, respectively calculating information of new intersection points on the two circular curves by using an intersection point method, and calculating the coordinates of any mileage point in the large switchback curve by using the intersection point method based on the two calculated intersection points. The method provided by the invention improves precision of measurement results, enhances calculation efficiency of the coordinates of mileage points in the curve of a road, overcomes the problems that alignment and setting-out in the conventional intersection point method cannot deal with the large switchback curve, and is simple, rapid and convenient in calculation and accurate in calculation results.

Description

technical field [0001] The invention relates to the field of engineering surveying, in particular to a method for calculating and setting out a large turnaround curve of a road in a Beidou mobile surveying device. Background technique [0002] The intersection point method is one of the main methods for route alignment of roads, rivers, pipelines, etc. It determines the general direction of the route through the coordinates of the transfer point (intersection point) of the route, and determines the specific coordinates of the route through the information of straight lines, transitional curves and circular curves . The details are as follows: first, the design of this method is simple, and there are few parameters: only need to input the coordinates of the intersection point, the length of the first transitional curve, the radius of the circle and the length of the second transitional curve; The coordinates corresponding to the mileage offset; third, the error of the calcul...

AI Technical Summary

Problems solved by technology

This method of measuring and designing is blind, and it is not easy to check the accuracy; what's worse, once the closure cannot be closed and the closing error exceeds the limit, it is necessary to re-measure and design.

At present, the measurement equipment of other companies in the same industry does not provide the calculation and lofting method of the large back curve

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