库区高桩码头水下桩帽钢吊箱施工关键技术

Key Construction Technology of Underwater Pile Cap Steel Hanging Box Cofferdam for High-Piled Wharf in Inland River Reservoir Area

以福建南平港延平新城港区洋坑作业区码头施工为例,针对闽江水口库区高水位条件,结合高桩码头桩帽结构特征,对传统钢吊箱围堰结构进行创新和优化,通过增加靠船构件密闭空腔、设计靠船构件专用安放装置,开发了适用于高桩码头桩帽施工的钢吊箱围堰结构,为水下桩帽干施工作业创造了条件。并介绍了内河库区高桩码头水下桩帽钢吊箱围堰施工工艺,对钢吊箱拼装、靠船构件隔离舱室安装、钢吊箱整体下放、封堵混凝土浇筑、承重体系的受力转换以及靠船构件安装锚固方式进行了详细阐述。实践表明,改进的钢吊箱围堰从根本上解决了高桩码头水下桩帽施工和靠船构件安装的技术难题,提高了库区码头施工效率,缩短了工期、减小了施工成本,具有广阔的应用前景。

Taking the construction of the Yangkeng operation area wharf in the Yanping New City Port Area of Nanping Port in Fujian as an example,this paper addresses the challenges posed by high water levels in the Minjiang River estuary.It focuses on the structural characteristics of high-piled wharf pile caps and innovates and optimizes the traditional steel hanging box cofferdam structure.By adding sealed cavities for ship-relying components and designing specialized placement devices for these components,a steel hanging box cofferdam structure suitable for high-piled wharf pile cap construction has been developed,enabling dry construction conditions for underwater pile caps.The paper also details the construction process of the steel cofferdam for underwater pile caps at high-piled wharves in inland river reservoir areas,including the assembly of the steel cofferdam,installation of isolation chambers for ship-relying components,overall lowering of the steel cofferdam,sealing and concrete pouring,load transfer in the bearing system,and anchoring methods for installing ship-relying components.Practice has shown that the improved steel hanging box cofferdam effectively resolves the technical difficulties associated with the construction of underwater pile caps and the installation of ship-relying components at high-piled wharves.It enhances construction efficiency at reservoir wharves,reduces construction time and costs,and offers broad application prospects.