摘要
[目的]为了应对斜插式长导管架钢桩在吊高、翻桩、结构强度、施工工序等面临的挑战,并且控制施工船舶的工期与成本,指导工程安全高效完成,[方法]依托山东能源渤中海上风电A场址海上升压站导管架的实际施工经验,分析和讨论超长辅助斜桩给设计与施工阶段带来的难点。创新性地提出“双钩斜插工艺”以解决目前市面上大多数浮吊船在竖直吊装时吊高不够的问题。针对超长斜桩容易发生屈曲的问题,分析得到API规范在屈曲校核过程中忽略钢桩质量分布使得计算结果过于保守的结论,提出基于钢桩重力分布和锤重的屈曲计算方法,最后考虑土壤边界条件下的沉桩动载荷和倾斜状态下静应力的叠加效应形成一套有效评估钢桩屈服强度的方法。[结果]结合实际工程过程,给出在应对浮吊吊高不足和翻桩困难时的解决方案和施工工艺,成功对打桩过程中的钢桩自由站立结构强度进行静载与动载的组合校核。[结论]研究成果可结合实际施工经验分别给出对应策略,为以后涉及超长辅助斜桩在自由吊装和自由站立下的结构强度校核提供借鉴,对未来海上风电向大规模方向发展具有参考意义。
[Purpose]To address the challenges associated with lifting,maneuvering and structural integrity,as well as to optimize the construction process,thereby effectively managing the project timeline and cost of the construction vessel,the project is completed in a safe and efficient manner.[Method]Based on the actual construction experience of the offshore substation jacket foundation for the Bozhong offshore wind farm a site in Shandong province,the difficulties brought about by the super-long auxiliary inclined piles in the design and construction stages is discusses.An innovative"double hook inclined insertion process"is proposed to solve the problem that most floating crane vessels cannot achieve sufficient lifting height in vertical lifting.For the problem of easy buckling of super-long inclined piles,the conclusion that the API specification neglects the weight distribution of steel piles in buckling check is analyized,resulting in conservative calculation results.Then,a buckling calculation method based on the weight distribution of steel piles and the weight of the hammer is proposed.Finally,considering the combined effect of the dynamic load and static stress caused by the pile driving under the soil boundary conditions and the inclined state,a method for effectively evaluating the yield strength of steel piles is formed.[Result]Taking into account the actual engineering process,solutions and construction techniques are given to deal with insufficient crane lifting height and difficulties in turning piles,successfully carrying out a combined static and dynamic load test on the steel pile free-standing structure during the pile driving process.[Conclusion]The research findings can be combined with practical construction experience to provide corresponding strategies,which can serve as a reference for future structural strength verification involving super-long auxiliary piles in free lifting and free standing conditions.These findings are of great significance for the future development of offshore wind power towards large-scale applications.
作者
王飞
李祥燕
娄睿
叶亚龙
WANG Fei;LI Xiangyan;LOU Rui;YE Yaong(Salvage Technology Development Center,Yantai Salvage,Yantai 264000,Shandong,China)
出处
《船舶工程》
北大核心
2025年第S1期50-57,63,共9页
Ship Engineering
关键词
斜桩
屈曲
超长
海上风电
导管架基础
inclined pile
buckling
ultra-long
offshore wind power
jacket foundation
