About the author:

1.CCCC Second Harbour Engineering Co., Ltd., Wuhan, Hubei 430040, China; 2.Key Laboratory of Large⁃spanBridge Construction Technology, Wuhan, Hubei 430040, China; 3.Research and Development Center of TransportIndustry of Intelligent Manufacturing Technologies of Transport Infrastructure, Wuhan, Hubei 430040, China;4. China Gezhouba Group Municipal Engineering Co., Ltd., Yichang, Hubei 443002, China

Abstract:

Aiming at the problem that the verticality of three⁃axis mixing pile construction cannot beeffectively monitored and controlled, based on the testing section of underground continuous wallreinforcement of the South Anchorage Foundation of the Zhangjinggao Yangtze River Bridge, a tilt sensoris installed on the three⁃axis mixing pile machine, and the application and monitoring data aresummarized and analyzed. The research results are as follows that the application of the inclination sensorcan effectively monitor and control the verticality of the pile. During the construction, the guide frameonly has a brief yet large shaking when the bit is buried, the blade passes through the casing, and duringthe reverse lifting. While the verticality in the other stages basically meets requirement. The verticalityassurance rate curve of the guide frame shows a trend of increasing before decreasing, and the curve risesand gradually converges to 100%. The guarantee rates of the guide frame for typical initial opening span,normal intervals with double⁃side overlap, and ultra⁃long intervals with single⁃side overlap are 89.09%,97.70% and 81.68%, respectively. In the construction of a three⁃axis mixing pile, the method of jump⁃hitting is preferred, and the interval time of lapping construction should be controlled within 24hourswhen using a single⁃side squeezing method.