Research and Application of Jacket Multi-pile Structure Foundation Installa-tion for Offshore Wind Power Engineering

[Introduction]  Due to the jacket multi-pile structure-foundation has not been widely used in our country up to now, there is no mature technology for using. In order to solve the difficult problem of jack four-pile foundation positioning accuracy control and tilt control for Zhuhai Gui Shan Offshore Wind Power Engineering, we explored a new technology, which fills a domestic gap. [Method]  According to carefully analyzed the special hydrology、geology、wind、waves and other sea conditions, combined with international cases, repeated investigation and research, and invite expert argumentation, We finally proposed a new method to control the positional accuracy and tilt accuracy of multi-pile connection, and designed a set equipment to assist jacket installation. [Result]  The set of techniques′ function include double-deck guide frame for accurate positioning and leveling、lower guide frame for limiting pile inserting、double hydraulic jack is used to adjust the inclination of steel pile、RTK GPS total station real-time tracking and guide jacket connect to multi-pile underwater. The method was successfully used in Zhuhai Gui Shan Offshore Wind Power Engineering, it optimized the design process, made the jacket four-pile foundation installation project completed efficiently、high quality and accurately. The application in the ZhuHai project saved much valuable time, it made a good preparation for wind-turbine installation, sea cable laying and combining to grid. [Conclusion]  The application of the techniques promoted the jacket multi-pile theoretical research to engineering practice, solved the difficult problem of jacket multi-pile installation accuracy controlling for offshore wind powering engineering, made a good technical reserve for wide use of jacket multi-pile platform in offshore wind powering engineering.