泰州长江公路大桥深水沉井基础定位下沉与控制技术研究  

Study of Positioning,Sinking and Control Techniques for Deep Water Caisson of Taizhou Changjiang River Highway Bridge

作　　者：刘建波[1,2] 张永涛[1,2] 杨炎华[1,2] 牛照[1,2] 

机构地区：[1]中交第二航务工程局有限公司技术中心,湖北武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040

出　　处：《桥梁建设》2011年第6期76-81,共6页Bridge Construction

基　　金：国家科技支撑计划资助项目(2009BAG15B02)

摘　　要：为解决泰州长江公路大桥在复杂条件下深水沉井定位难、摆动大等难题,以该桥中塔沉井为例,采用河工模型试验、CFD方法分析沉井着床阶段的河床冲刷形态和沉井摆动,同时研究终沉阶段下沉系数和沉井施工监控系统。根据分析研究结果,沉井定位采用"钢锚墩+锚系"的半刚性定位系统;采用"小锅底"取土方式下沉;采用信息化实时监控系统实时监测沉井空间几何姿态,确保了沉井准确定位与平稳下沉,最终将其平面误差控制在30cm以内,垂直度误差为1/363。To deal with the problem of positioning difficulty and great oscillation of the deepwater caissons of Taizhou Changjiang River Highway Bridge under complicated conditions, the caisson of the intermediate tower of the bridge was cited as an example, the riverbed scouring modes and oscillation of the caisson at the stage the caisson was landed on the riverbed were analyzed, the sinking parameters of the caisson at the final sinking stage and the construction monitoring and control system for the caisson were studied by the river model testing and the CFD method. In terms of the results of the analysis and study, it was determined that the caisson should be positioned by the semi-rigid system of steel mooring piers plus mooring cables and the caisson should he sunk down by way of the ＂pan bottom＂ shape soil removal. In the construction process, the informationized real-time monitoring and control system was used to monitor and control the spatial geometric posture of the caisson and the accurate positioning and stable sinking of the caisson was therefore ensured. Finally, the plan error of the caisson was successfully controlled within 30 cm and the perpendicularity error was 1/363.

关 键 词：泰州长江公路大桥 悬索桥 沉井基础 定位系统 研究 桥梁施工 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U445.557[交通运输工程—道路与铁道工程]