基于北斗/GNSS RTK技术的道路开挖/填筑线放样方法

Setting-out method of road excavation/filling line by using BeiDou/GNSS RTK technology

在道路施工放样中，开挖/填筑线的正确放样至关重要。结合北斗/GNSS RTK 新技术的优势，给出开挖/填筑点的判定条件，提出基于 RTK 技术的道路开挖/填筑线放样方法：依据设计单位提供的横断面图纸，计算近似开挖/填筑点的坐标以及与其在横断面方向相邻3~5 m 点的坐标；利用 RTK 现场放样此两点，并根据判定条件，在此两点确定的方向上逐步逼近开挖/填筑点；施工进程中，利用末级碎落平台的里或外边缘点，以及第一级填筑边坡拐点，进一步检核开挖/填筑点放样的正确性。

It is vital important to determine excavation/filling line properly in road setting-out engineering. Combined with BeiDou/GNSS （BeiDou Navigation Satellite System/Global navigation Satellite System） advantages,the decision condition of excavation/filling point is given,and the setting-out method of road excavation/filling line by using BeiDou/GNSS RTK （Real Time Kinematic）technology is proposed.The main operation steps of this method are：according to the designed cross-cectional profile,the coordinates of approximate excavation/filling point and its five meters neighbor interpolation point are calculated;then the two points are located by using RTK.And according to the decision condition of excavation/filling point, the real excavation/filling point will be gotten progressively in the direction determined by the two setting-out points.In the process of construction,the validity of the setting-out excavation/filling point is proved further by using the border points of the final stage for heaping soil and brocken rock,or by using the knee point of the first filling side slope.The application results show it is a valid setting-out method of road excavation/filling line.