大型跨海桥梁下部结构高精度建设关键技术

Key technologies for high-precision construction of substructures of large-scale sea-crossing bridges

装配式桥梁具有建造速度快、对环境影响低、施工质量可靠、节能环保等优点,是桥梁工程领域未来的重要发展方向。以厦门第二东通道项目为依托,开展了大型跨海桥梁下部结构高精度建设关键技术研究,针对潮差大、流速大、地质情况复杂、止水难度高以及施工精度要求高等项目施工过程中的重难点,研发了大潮差钢管桩高精度沉桩、大型墩台快速高质量预制、大水深预制墩台安装止水等关键核心技术。形成了一套适用于外海大型桥梁在复杂施工环境及因素下高精度沉桩、墩台高质量预制、高精度安装及快速止水的施工技术,支撑厦门二东通道主桥工程提前5个月通车运营,也可为类似工程提供借鉴。

Prefabricated bridges have the advantages of fast construction speed,low environmental impact,reliable construction quality,energy conservation and environmental protection,and are an important development direction in the field of bridge engineering in the future.Based on the Xiamen Second East Passage project,we have conducted research on key technologies for high-precision construction of the substructure of large-scale sea-crossing bridges.In response to the key and difficult points in the construction process of projects with large tidal range,high flow velocity,complex geological conditions,high difficulty in water stopping,and high requirements for construction accuracy,we have developed key core technologies such as high-precision pile sinking of steel pipe piles with large tidal range,rapid and high-quality prefabrication of large piers and abutments,and installation and water stopping of prefabricated piers and abutments with large water depth.A set of construction technologies suitable for high-precision pile sinking,high-quality prefabrication of piers and abutments,high-precision installation,and rapid water sealing of large offshore bridges in complex construction environments and factors has been formed,which supports the Xiamen Second East Passage main bridge project to be opened to traffic 5 months ahead of schedule,and can also provide reference for similar projects.