Construction paying off method for determining boundary point of side slope of subgrade on terrain line

Abstract

The invention provides a construction paying off method for determining the boundary point of a side slope of a subgrade on a terrain line, which can improve the paying off efficiency of the boundary point of the side slope of the subgrade and meet the requirement for the construction precision of the side slope of the subgrade, and can be extensively completed by testing an intervisible part of any survey station arranged outside the design center line of a road. The method comprises the following steps of: setting a mileage reference point on the center line of a road, evaluating the shortest distance between the side point of the center line and the horizontal curve of the road by using the method of uniform approach so as to determine the vertical distance and the foot-point mileage between the slope point subjected to on-site pretesting and the design center line of the road in a plane; calculating the theoretical horizontal distance between a crossover point of an elevation surface on which the pretesting point is positioned and the design line of the side slope and the design line of the subgrade according to the design parameters such as the center-line elevation and the subgrade at the mileage, the width of a structure, the slope ratios and the step numbers of the cross slope and the side slope, and the like; subtracting the vertical distance from the theoretical horizontal distance so as to obtain the displacement from the pretesting pint to the theoretical boundary point; and moving the pretesting point, and repeating the steps to make the displacement asymptotically to zero so as to determine the position of the boundary point of the side slope.

Description

technical field [0001] The invention relates to a method for measuring, calculating and setting out accurate setting out of roadbed side slope excavation and filling boundary points by using a total station in highway engineering construction, and is especially suitable for setting out in roadbed side slope construction in mountainous areas with complex terrain. Background technique [0002] At present, in the road construction process, the total station is used to carry out the stakeout method of the subgrade slope excavation and filling boundary points. First, the middle pile mileage is given, and then the test point is moved on the normal line of the mileage center line to find the The section design slope is adapted to the ground point. In this way, the position of the stakeout boundary point is not necessarily on the feature point of the terrain, so the error of the cut groove line or fill slope foot line formed by connecting the boundary points is very large, which not...

AI Technical Summary

Problems solved by technology

In this way, the position of the stakeout boundary point is not necessarily on the feature point of the terrain, so the error of the cut groove line or fill slope foot line formed by connecting the boundary points is very large, which not only affects the construction quality of the slope, but also due to over-excavation, over-excavation, etc. Filling increases the amount of work and destroys the natural environment on the surface

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