钢箱提篮拱三阶段扣挂法安装技术研究

Research on Three Stages Fastening Stay Method Installation Technology of Steel Box Basket Arch

针对传统扣挂法施工时存在的拱肋节段间连接方式与时机不确定,未能准确体现施工过程实际结构的变化,对成桥状态的控制存在影响的问题,提出三阶段扣挂法,将单个拱肋节段的安装明确划分三个阶段;根据每个阶段的结构特点,施工采取相应措施进行模拟;并对其施工过程及扣锚索索力、塔顶位移、拱肋定位坐标、温度修正等主控指标的计算原理进行分析,对施工工艺、主要采取的关键措施、施工控制要点详细说明。通过在实际工程中的成功应用,依据实测数据与理论计算数据的对比,此三阶段扣挂法更好地保证了成桥状态,同时使整个施工过程规范化、流程化,提高了工效。

In the construction of traditional fastening stay method,the connection mode and the time for the intersegmental arch ribs is indeterminacy,so it is hard to reflect the actual changes on the structure accurately in the construction process,it influences the control of the completed bridge state.Contrapose this issue,this paper presents three-stage fastening stay method,the installation of a single arch rib segment is clearly divided into three stages,according to the feature of each stage,the construction takes corresponding measures to simulate.The construction process and calculation principle of anchor cable force,the displacement for the top of the tower,arch rib positioning coordinates,temperature correction and other main control indicators are analyzed.The construction technology,key measures and construction control points are explained in detail.Through the successful application in practical engineering,according to the comparison between the measured data and the theoretical calculation data,the three-stage fastening stay method can better ensure the state of the completed bridge,and at the same time make the whole construction process standardized and streamlined,and improve the work efficiency.