Method of controlling the elevation of the road subgrade

The present invention discloses a method for controlling the elevation of the roadbed, comprising the steps of: A, lay the control benchmark; B, two down from the fixed control nailed on each control pole; C, the two control lines connected to the control nailed; D, at least three markers height control points in a subgrade where the plane of the two control lines, wherein a height control points of the road centerline plane and two control lines where the intersection point, the height control points other distributed on both sides of the intersection; E, the measurement plane of the two control lines where the cross section of the road subgrade elevation, the elevation of each road surface were measured elevation control points. This method can improve the control accuracy subgrade elevation; the method is low cost, it is conducive to reducing the cost of the project; and the use of this method, each operation again only road grader, can make cross-sectional elevation of the measured arrival normally design standards, high efficiency, help to improve construction speed.