丰城赣江大桥水上钻孔定位测量

Supersurface Fined-Locality Surveying of borehole for the Fengcheng Ganjiang River Bridge

丰城赣江大桥工程地质勘察水上钻孔定位施工放样是采用方向法前方交会.用电磁波测距三角高程测量来测定其孔口标高.从误差传播定律的角度,论证了该施测方案的正确性,同时也论述了要达到高精度放样的最佳图形是布设成两底角为锐角的等腰三角形.

The construction setting-out of supersurface location of boreholes in the engineering geology exploration of the Fongcheng Ganjiang River Bridge utilited direction method about the front intersection. The elevation of orifices were decided by electromagenetic wave distance-measure-ment and trigonometric levelling. According to the law of error propagation, Confirmed that the surveying scheme is true and the best diagram for carrying out the high accuracy ot the sittingout was to be located in triangle with equal lateral sides and both the sharp base angles.