GPS与CAD技术在特大型桥梁测量中的运用研究

Research on the Application of GPS and CAD Technology in Oversize Bridge Survey

特大型桥梁工程跨径较大、结构复杂,传统测量方法已经无法满足工程实际需求,因此,可运用GPS与CAD及人工智能控制测量手段,确保桥梁的耐久性和安全性。阳新黄河特大桥工程利用GPS与CAD技术的测绘优势,从主要控制网点布设、选点、观测站到不同监测站之间的位置测量,顺利实现已建成高速公路与跨黄河特大桥各墩柱之间的平、纵面线形连接和转换。依据GPS测量数据,通过计算得到该桥梁梁底控制标高不得低于72.25 m,水位控制的梁底标高不得低于66.93 m,航孔跨以通航净空控制的梁底标高不得低于71.93 m的大桥工程设计。同时,在这一工程中还大量采用GPS技术与CAD软件智能生成图纸技术,带来良好的设计控制效果。

Oversize bridge projects have large spans and complex structures,and traditional measurement methods can no longer meet the actual needs of the project.Therefore,it is necessary to use GPS,CAD and artificial intelligence to control the measurement methods to ensure the durability and safety of the bridge.The Yangxin Yellow River Super Bridge Project utilizes the advantages of GPS and CAD technology in surveying and mapping,from the main control network layout,point selection,observation stations to the position measurement between different monitoring stations,and successfully realizes the connection between the completed expressway and the piers and columns of the bridge across the Yellow River.Horizontal and vertical linear connections and transformations between them.According to the GPS measurement data,the control elevation of the girder bottom of the bridge shall not be lower than 72.25 m,the girder bottom elevation controlled by the water level shall not be lower than 66.93m,and the girder bottom elevation controlled by the navigation clearance shall not be lower than 71.93 m.design.At the same time,GPS technology and CAD software are also used in this project to generate drawings intelligently,which brings good design control effect.