免棱镜全站仪在桥梁拱圈竖向线形检测中的应用研究

既有拱桥在检测时,拱圈竖向线形测量工作量大、危险性高、操作不方便,为解决这个难题,提出一种在拱桥侧面适当位置架设免棱镜全站仪测量拱圈竖向线形的方法,并给出详细操作步骤.分析该方法测量误差的主要来源,并根据误差传播定律,推导拱圈竖向线形测量中误差的计算公式.工程实例证明,该方法具有简单、实用价值高、适应性强等优点,是桥梁拱圈竖向线形检测的一种较好方法.

Research on Application of Total-station Instrument without Prism in Detection for Vertical Line Types of Bridge Arch Rings

For detection of existing arch bridges,the measurement for vertical linetypes faces large workload,high danger and inconvenient operation.To solve this problem,this paper proposes a method of setting up a total-station instrument without prism at proper position on the side of bridge arch to measure vertical line types and gives out detailed operating steps;analyzes main sources of measurement errors of this method and deduces computational formulae for errors in measurement for vertical line types of arch rings according to the law of propagation of errors.Project examples prove this method has advantages of simplicity,high practical value and strong adaptability,etc.and is a better method of detection for vertical line types of bridge arch rings.