大型沉井施工空间形位控制与沉降预测分析  

Spatial Shape Control and Settlement Prediction Analysis of Large Caisson Construction

作　　者：顾惠明[1] GU Huiming(China Railway Major Bridge Engineering Group Co.Ltd.,Wuhan 430050,China)

机构地区：[1]中铁大桥局集团有限公司,武汉430050

出　　处：《铁道建筑》2023年第7期79-83,共5页Railway Engineering

摘　　要：为系统性分析大型沉井施工在各阶段不同场区环境下的测量控制要点,以沪苏通长江公铁大桥建设为依托,将全站仪观测与GPS-RTK监测技术相结合,建立了跨江控制网和通信网络。沉井厂内预制阶段控制加工安装精度,定位着床、接高下沉阶段重点观测并控制沉井空间形位姿态,上部结构施工阶段至运营期提出基于荷载比的二次修正双曲线沉降预测方法,并开展了高精度长期沉降观测及理论验证。通过全过程精准高效测量控制,桥墩平面定位误差、平面扭转角、累计沉降等指标均满足要求。In order to systematically analyze the surveying and control key points of large submerged caisson under different site environments and different stages,based on the construction of Shanghai-Suzhou-Nantong Yangtze River Bridge,combining total station observation with GPS-RTK monitoring technology,a cross-river control network and communication network were established to control the processing and installation accuracy in the prefabrication stage of caisson plant.The space shape and posture of caisson were observed and controlled at the stage of positioning and settling,and the hyperbolic settlement prediction method based on the load ratio was applied during the period from superstructure construction to operation,and the high-precision long-term settlement observation and theoretical verification were carried out.Through accurate and efficient measurement control of the whole process,the pier position accuracy,plane torsion angle and accumulated settement etc.meet requirements.

关 键 词：公铁两用桥梁 大型沉井 施工方案 空间形位控制 测量 沉降预测 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]