基于约束法平差的桥梁施工控制测量技术研究

Research on Bridge Construction Control Measurement Technology Based on Constraint Adjustment Method

针对GPS测量控制网所控制的轴线与路线控制网所控制的路线中线间正确合理衔接的问题,本文提出了GPS桥梁施工控制网约束平差方法,该方法通过在GPS桥梁施工控制网中引入边长约束和方位约束,避免了传统方法所导致的控制网精度畸变,更好地保证了路线的连续性和舒适光顺的设计效果。工程实践表明,辅以均匀合理的布点方案和适当的数学模型,约束平差不仅实现了轴线与中线的正确合理衔接,其精度也满足施工控制测量要求。

According to the correct and reasonable convergence problem between axis of GPS surveying control network and the center line of route control network,this paper presents constraint adjustment method of GPS bridge construction control. The method introduces side length constraint and a position constraint into GPS bridge construction control network,the accuracy distortion of control network resulted in the traditional methods is avoided,and better ensures the continuity of the line and comfortable fairing design effect. Engineering practice shows that the supplemented with uniform and reasonable layout scheme and the appropriate mathematical model,constraint adjustment not only to achieve the axis with the centerline of the correct and reasonable convergence,the accuracy also meet the measurement requirements of construction control.