TPS测设道路填挖边线方法探讨

道路建设中,测设填挖线是经常遇到的问题,就此提出了TPS(全站仪)在任意控制点设站、测定辅助点和填挖点的放样方法。该方法的关键之处是,利用曲线要素推算各放样点的坐标,然后在道路施工现场附近选择一视野开阔的控制点安置TPS,一次性放样出全视野内的辅助点和填挖点,并连接填挖点组成填挖边线。为保证各阶削坡的精度,应注意保护各辅助点的平面位置,正确地削出最上阶平台,以控制以下各阶削坡。而以往的放样方法是抬竿法,需要在逐个横断面多次设站,用定向、量距、抬高的方法放样填挖点。这种方法的缺点是:效率低下,作业难度大,累计误差大。显然,用TPS一次设站,放样若干横断面填挖点的方法,提高了施工效率,降低了作业难度,且提高了放样点的精度。

RESEARCH ON TPS SETING OUT THE LINE OF EXCAVATING AND FILLING IN BUILDING ROAD

In building road,surveyor often faces the problem to set out the line of excavating and filling.In order to solve this problem,this paper brings out the way to set out the assistants point and the lines of excavating and filling by TPS on a freewill control station.Calculating the coordinates of the points to set out these points and lines is the key of this way.To insure the precision of each slope cut,we should take care of the plane location of each assistant point ,and cut the top flat roof exactly,so we can control the slope that we will cut easily.However the past way which was running up pole.That way need set a station,direct and run up pole repeatedly to set out the points of excavating and filling.This way is inefficient,difficult and whose error is remarkable .Apparently,the way to set out the assistant points and the points of excavating and filling by TPS on a freewill control station is efficient,easily and accurate.