About the author:

1. Liuzhou Qianqiao Technology Co.,Ltd.,Liuzhou, Guangxi 545112,China;2. Guizhou Road and Bridge Group Co., Ltd.,Guiyang, Guizhou 550001,China

Abstract:

In construction of hydraulic climbing formwork for high piers of bridges, the positioningaccuracy of formwork is the key to the linear control of high piers, and the positioning accuracy offormwork depends on the accuracy of measurement and lofting. The measurement methods of traditionaltotal station and laser plummet apparatus are greatly affected by environment, climate and human factors,and the manual workload is large, the real⁃time performance is poor. In construction of the main pier ofLiuzhi Super Large Bridge, the GNSS⁃based measurement lofting technology is introduced to realize theautomatic monitoring of the formwork positioning and provide real⁃time parameters for the formworkattitude adjustment. The application results show that the GNSS⁃based measurement lofting technology hasgood accuracy and reliability in formwork positioning monitoring, and has the advantages of all⁃weather,real⁃time and low labor cost.