大跨度水上钢管混凝土拱桥施工测量方法

Surveying method used in the construction of large-span steel tube concrete arch bridge upon river

大跨度钢管混凝土拱桥施工中的一个关键问题,就是精确地放样各段钢管拱的标高和轴线使其正确合拢,而复杂的环境条件和施工干扰等影响因素给测量精度的提高带来难度。本文结合具体的大跨度水上拱桥施工测量工作,分析了控制网的精度要求,介绍了控制测量和3维坐标放样的方法,提出了控制放样精度的途径。实践表明提出的方法实用方便、精度高,满足规范和设计的要求。

To accurately setting-out the axis and elevation of the arch in the large-span steel tube concrete arch bridge construction is an important problem,but it is difficult to raise the surveying precision under the complicate environment and construction.With concrete surveying work in a large-span arch bridge construction,the precision requirement of control surveying is analyzed,and the methods of control surveying and 3 dimensional coordinate setting-out are introduced,and a way for controlling precision of setting-out point is proposed.Practice proves that the method in this paper is easy for operation and with high precision,it can meet the specification and design requirements.