框套顶压水下施工装置设计与应用

Design and application of underwater construction device subjected to top pressure of casing

圆柱形结构表面设置水下挡水装置,需解决装置与圆柱结构共同密封挡水和承担装置所受上浮力两大问题。通过现有围护挡水结构的分析,提出了一种由挡水结构和受力结构两部分组成的框套顶压水下施工装置。挡水结构为底部预留圆孔、顶部敞开的剖分式框套结构,通过预留圆孔与圆柱结构的紧密接触挡水;受力结构为布置在桩基顶部的井字形顶压式结构,承担挡水结构上浮力并传递至相邻的2根桩基结构上。结合某高桩码头的浮式系船桩钢套箱安装实践,进行了装置设计和桩基结构稳定性验算,明确了施工要点及工序控制要求。本装置可重复使用、经济合理、技术可行,可为类似工程水下施工提供借鉴。

If the underwater water retaining device is to be installed on the surface of the cylindrical structure,it is necessary to solve the two major problems of sealing and retaining water together with the cylinder structure and bearing the buoyancy of the device.Based on the analysis of existing water retaining structures,this paper puts forward a kind of underwater construction device subjected to top pressure of casing which is composed of water retaining structures and bearing structures.The water retaining structure is a split casing structure with a circular hole reserved at the bottom and an open top,and the water is retained by the close contact between the reserved circular hole and the cylindrical structure.The bearing structure is a well-shaped top pressure structure arranged on the top of the pile foundation,bearing the buoyancy on the water retaining structure and transmitting it to the two adjacent pile foundation structures.Combined with the installation practice of the floating mooring pile steel casing box of a high-piled wharf,the device design and the stability check calculation of pile foundation structures are carried out in this paper,and the construction key points and process control requirements are clarified.The device is reusable,economical,reasonable,and technically feasible,which provides a reference for the underwater construction of similar projects.