本文提出了一种针对海上风电单桩基础结构计算的改进竖向地基梁法,并对单桩基础结构进行了优化计算.对单桩基础结构采用竖向地基梁法计算,基于m法计算土抗力,限制浅层土抗力的极限值不能超过极限土压力.结合工程情况,利用传统竖向地基梁法与改进方法,对单桩基础结构进行了优化计算,两种方法的计算结果存在一定差异,改进计算方法所得最大泥面水平位移增大34.6％.对于变形控制较为严格的海上风电桩基础结构,限制浅层土抗力的极限值不能超过极限土压力并使用改进方法对单桩结构进行计算是必要的.

超大直径单桩基础在应用过程中,存在钢管桩沉桩的选锤、防溜桩等关键问题.为解决以上问题,研究超大直径单桩的竖向抗压承载力是有必要的.分别利用《码头结构设计规范》规定的设计做法、圆孔扩张理论法、UWA-05方法、GRLWEAP模型方法对超大直径钢管桩的竖向抗压承载力进行了分析计算并结合工程实例进行比较,发现现行规范规定的钢管桩承载力计算公式对于超大直径钢管桩承载力的估计偏于保守,高应变检测法对于超大直径单桩基础承载力的评估同样偏于保守.

长螺旋钻孔灌注桩广泛应用于水工建筑物桩基础施工.文章主要介绍了在软土条件下应用长螺旋钻孔灌注桩技术原理和特点、施工工艺流程、施工的关键点,探讨这种工法在护岸工程中应用效果.

根据地质资料,结合现场灌注桩施工情况,先后采用反循环、旋挖钻、正循环等不同工艺,适时调整施工参数以适应本工程地质条件.最终圆满完成施工任务,提高了易坍地质下灌注桩的成功率.

面对我国海上风电开发的重大需求及施工装备技术性能的严重不足,从工程实际需求出发,充分吸收国内外自升式平台优点,并综合考虑我国沿海地质与海况等条件,研制我国新一代海上风电安装船"港航平9".介绍该平台的总体布置及参数、关键设备的设计思想和方案,总结其设计特点,并对该平台的施工工艺进行说明.通过工程实践检验,"港航平9"施工实用性强,所形成的工艺施工质量满足工程项目要求,施工安全性及效率相比传统方式有较大提高,成本也相对较低.

劲性搅拌桩是一种将PHC管桩插入水泥土中形成协同受力的桩型.在天津市汉沽区某工业园区场地内进行了大直径等长芯劲性搅拌桩单桩竖向承载力试验,并和相同直径灌注桩做了对比.试验结果表明,劲性搅拌桩成桩质量好,水泥土取芯单轴抗压强度高,可以为管桩-水泥土内界面提供足够的抗剪强度.大直径劲性搅拌桩极限承载力、单桩总侧阻力、端承阻力和同直径灌注桩相比均有大幅度提升,短劲性搅拌桩的端承比例更大且端阻发挥的时机更早.和同直径的灌注桩比,劲性搅拌桩提供相同的承载力所需的桩身长度大幅度减少,降低单位承载力造价.

Pseudo-static tests of five prefabricated high-strength concrete pipe column specimens under an axial com-pression ratio of 0.15 were conducted.The influencing factors including form of reinforcement and degree of prestress were analyzed.Two full prestressed reinforced specimensere configured with twelve prestress steel bars.Three hybrid reinforced specimens were configured with six prestress steel bars and six HRB400 reinforcements.Damage form of the specimens,the hysteretic curves,the bearing capacity,the stiffness degradation and the energy dissipation ca-pacity were obtained from the tests.The results show that the hybrid reinforced specimens with lower degreeof prestress have more cracks and fuller hysteretic curves than the full prestressed reinforced specimens.Whenthe specimens were damaged,the prefabricated column foot had no large deformation and the anchor bolts were not dam-aged.On this basis,the study corrects the normal section flexural capacity calculation formula of ring-section mem-bers of concrete in the code for design of concrete structures and suggests the calculation formula applicable to high-strength concrete pipe column.

In order to promote the application of high-rise pile cap foundation in offshore wind power project, to overcome the shortage of traditional pile driving barge construction such as the large number of barge shift and the large impact of waves, we put forward new technology of lifting and driving of inclined pile in offshore elevated pile cap foundation. We studied the vibratory hammer equipment, designed the spud and limiting guide, analyzed the key construction technologies and successfully used in shallow live oysters reef unique ecosystem protection and restoration projects ocean in Dashentang of Tianjin,which is a surveillance monitoring platform construction project. Engineering practice shows, this process has the characteristics of fast construction speed, high pile quality and low construction cost.

在国内第一个潮间带风电场项目——江苏龙源如东150 MW海上风电场一期示范工程中,首次采用了无过渡段单桩作为风机基础.文中通过对该项目实施经验的总结,介绍了潮间带风电场无过渡段单桩基础施工工艺、船舶选型、打桩锤选择、桩身垂直度测量与控制以及施工操作要点等关键技术,可为类似工程施工提供参考.