文档介绍：GPS桥梁高程控制测量*
岑敏仪①瞿国万①刘成龙①卓健成①路伯祥①林荣有②
(①西南交通大学测量工程系,成都,610031)
(②广东省长大公路工程有限公司,广州,510075)
GPS TECHNOLOGY FOR BRIDGE HEIGHT CONTROL SURVEYING
Cen Minyi①, Qi Guowan②, Liu Chenglong①, Zhuo Jiancheng①
Lu Baixiang①, Lin Rongyou②
网
(① Department of Surveying Engineering, Southwest Jiaotong University, Chengdu,610031)
(② Guangdong Chang Da Highway Engineering Ltd. Co., Guangzhon, 510075)
Abstract Using difference in height anomaly between neighbouring benchmarks separately located on the left and right banks of a river, a new fitting method is proposed in this paper. The fitting parameters are able to avoid the influence from the discrepancy of vertical datums between two river banks. Through the test of Humen Bridge, the accuracy of calculated vertical datum difference between two banks over 3 km apart can meet the need of the extra long highway bridge vertical control. These researches would be helpful to railroad bridge crossover-river leveling in coastal plains.
Keywords GPS, Bridge, Over-river leveling, Construction ellipsoid
摘要本文提出利用江河每边岸上相邻水准点间的高程异常差进行GPS高程拟合,避免了两岸未统一高程系统对拟合参数的影响,经虎门大桥实验验证,在海面宽3 km多的两岸上获得的高程系统差的精度满足特大型公路桥梁的高程控制要求,这对沿海平坦地区的铁路桥梁跨河水准测量都有参考作用。
关键词 GPS 桥梁跨河水准测量施工椭球
分类号 P224 网
1 前言网
建立特大型桥梁的高程控制网的作用主要有两条,一是保证桥梁的建造按设计的要求进行;二是对桥梁施工过程进行沉降观测,并为大桥竣工后的运营管理提供安全保证。由于原有勘测阶段的高程控制点或两岸未直接联测的国家水准点精度已不能达到桥梁施工的精度要求,因此,必须建立大桥专用的高程控制网。其中技术要求最高的是跨河水准测量。通常采用的光学测微法、经纬仪