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大榭第二大桥为单索面钢箱梁斜拉桥,主墩区和边跨钢箱梁采用高支架施工。为了保证支架安全,减小钢箱梁扭曲变形,确保主梁线形满足精度控制要求,提出了高支架施工精细化控制方法,采用压力传感器监测高支架上各梁段施工过程中的反力变化,并与理论值进行比较。研究表明,高支架上钢箱梁段初调完成后,各支点反力相差较大,往往超过30%,对支点反力进行调整后,上、下游支点反力差值可以控制在5%以内;从而减小了单索面钢箱梁由于支点反力不匀导致的扭转变形,降低了高支架施工的风险;同时高支架上钢箱梁段上、下游测点相对高差绝大部分控制在10mm以内,说明通过对施工过程中钢箱梁支点反力的调整,有效地起到了控制钢箱梁线形的作用。
Daxie second bridge is a single cable plane steel box girder cable-stayed bridge, the main pier area and the side of the steel box girder using high-bracket construction. In order to ensure the safety of the support, reduce the distortion of the steel box girder and ensure that the main girder linearity meets the requirements of precision control, the fine control method of high support construction is proposed. The pressure sensor is used to monitor the reaction force during the construction of each high- And compared with the theoretical value. The research shows that after the initial adjustment of the steel box girder sections on high supports, the reaction force of each branch point is quite large, often more than 30%. After adjustment of the reaction force of the fulcrum point, the reaction force difference of the fulcrums at the upper and lower reaches can be controlled within 5% Reducing the torsional deformation caused by the uneven reaction force of the single-cable surface steel box girder, which reduces the risk of high-support construction; at the same time, the relative height difference between the upper and lower steel box girders on the high support is mostly controlled at 10mm , Indicating that through the adjustment of the steel box girder reaction force during the construction process, it effectively plays the role of controlling the steel box girder linear.