芜湖长江公铁大桥主墩沉井测量与定位方法  

Wuhu Changjiang River Railway Bridge Main Pier Caisson Measurement and Positioning Method

作　　者：李杰[1] LI Jie(China Railway Bridge Bureau Group No.2 Engineering Co.,Ltd.,Nanjing 210015,China)

机构地区：[1]中铁大桥局集团第二工程有限公司,江苏南京210015

出　　处：《地理空间信息》2022年第5期102-106,共5页Geospatial Information

摘　　要：芜湖长江公铁大桥主桥3号墩基础采用设置式沉井基础,沉井基底最大爆破厚度达10 m。为解决钢沉井基底水下地形测量、沉井快速定位、精确着床的难题,水下地形测量现场采用GNSS-RTK与中海达HD280相结合的模式;沉井定位采用GNSS-RTK测量,沉井倾斜度采用吊挂与沉井(围堰)内壁的调平桩调整,沉井采用分节接高。简要介绍了沉井基底水下地形测量以及沉井在拼装、定位接高过程中面对水流大、水深、平面尺寸大、距离岸边远等不利条件时快速进行钢沉井精确定位的方法,对其他类似沉井基础施工具有一定的借鉴作用。The Pier 3 of Wuhu Changjiang River Gongtie Bridge is set caisson foundation, and the maximum blasting thickness of caisson foundation is 10 meters. To solve the problems of underwater topographic survey of steel caisson base, rapid positioning of caisson and accurate landing, the combined mode of GNSS-RTK and HD280 of Hi-Target was adopted in underwater topographic survey site. The positioning of open caisson was measured by GNSS-RTK, and the inclination was adjusted by leveling pile on the inner wall of open caisson(cofferdam). The caisson was spliced in sections. This article introduced the underwater topographic survey of caisson base and how to achieve fast and accurate positioning of caisson under unfavorable conditions such as large water flow, deep water, large plane size and long distance from shore during assembly and positioning. It can be used for reference for open caisson foundation construction in the industry.

关 键 词：水下地形 无验潮测量 陆地拼装测量 定位 接高测量 下沉测量 

分 类 号：P234.2[天文地球—摄影测量与遥感]