Analysis And Control Of Positioning Errors For High-class Highway

Our country still relies mainly on extensive highway capital construction in the present stage, is in the hope of realizing the arterial highway networkedly. Guarantee from highway network structure of the way that the highway meets the demand that the sustained economic development and living standards of the people improve constantly. In recent years, the country strengthened the dynamics of investment to highway construction. Alignment especially high-class highway alignment show kinds of one remarkable change characteristic digitized more and more high degree nowadays. Precision and reliability that it calculated, dealing with to the data have put forward higher request.Coordinate method alignment have certain requests to the precision and density of control network. The traditional construction of traverse is singly closed traverses, it limits very bigly to construction control and polygonometry. If adjustment by the method of least squares, we can according to need flexible to construct the framework of traverse with suitable density and enough precision. Bridge control network come and deal with as free network generally, because bridge construct demand the control network's relative position precision relatively high.Design files of the high-class highway engineering work out a chart of highway centre coordinates of successive stake . But it offers of limited number stake's coordinates, further calculate using the data of the chart would accumulate the errors of initial data and the middle computational process, influence the precision of calculating. Should regard initial data in the charts of route location and curve elements as datum that coordinates calculate will just get the datum of high accuracy, Guide constructing accurately.Besides special large span bridge design alone in high-class highway, general bridge design takes to obey the route trend. Bridge on curve section, especially oblique intersection with route, adopt the method that curved alignment bridge construct linear pattern. Exist on linear pattern beam and slab and route alignment problem that curve fit sharply type. Analyses the position errors while adopting this method accurately by the method of iterative calculations in this paper, offers the basis of the data for the overhead structure constructing.This paper make some brief discussions to the plan positioning errors for high-class highway mainly. Hope to seek the corresponding control method by the analysis of these errors correctly. Improve the precision of construct alignment. Because I have limited level, the contents that is insufficient and omitted in this paper, Please make a comment and guidance.