海上风电大直径钢管桩基础沉桩施工技术

Construction Technology of Large Diameter Steel Pipe Pile Foundation in Offshore Wind Power Projects

为解决复杂海床条件下大直径钢管桩沉桩初期所需纠偏力较大且沉桩控制难度大的问题,研究提出改进基础沉桩施工的方法;沉桩施工场地采用承重13 000 t且带有抱桩器和打桩锤的载重船甲板面;再通过浮漂确定施工机位位置,并全程采用船舶自带GPS定位系统进行精确定位;最后用振沉辅助桩及抱桩器安装、钢管桩翻桩、吊桩入抱桩器、自沉及压锤、锤击沉桩等关键施工技术。实践表明此技术可行。

In the initial stage of the driving construction of large diameter steel pipe pile under complex seabed conditions, the deviation correction force required is rather large and the pile driving process is difficult to control. Thus, improved driving construction technology of pile foundation is proposed. The pile driving construction is carried out on the deck surface of loading ships with 13 000 t load bearing capacity and equipped with pile holding device and pile driving hammer. Then, the construction position is determined with buoys and the GPS positioning system of the ships is adopted for accurate positioning throughout the whole process. At last, key construction techniques are adopted such as the installation of the vibration driving auxiliary pile and pile holder, overturning of the steel pipe pile, pile lifting into the pile holder, self sinking and hammer pushing, and hammer driving. Practice shows that the proposed technology is feasible.