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在钢管桩沉桩施工中,控制好钢管桩的定位、标高以及贯入度,是钢管桩施工中的质量控制要点,钢管桩沉桩完成后进行接桩、截桩及钢管桩的防腐修补施工。根据钢管桩沉桩的质量控制要点,在钢管桩施工中,要做好施工测量控制,确保沉桩位置的准确以及打桩的垂直度,保证沉桩的贯入度能够满足地基承载力的要求;同时要做好船机的调配工作,保证钢管桩沉桩施工的顺利进行。 相似文献
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介绍了广州港新沙港区板桩码头主要内力计算方法及常用软件,结合设计过程、工程地质情况、现场实际施工情况,着重从受力合理性、施工便利性、节省造价方面,对提出的钢板桩方案、钢管板桩方案进行比较分析,确定了钢管板桩结构更合理,并对优势进行总结。研究表明相对于钢板桩结构,钢管板桩结构在抗弯、抗变形、拉杆拉力和锚碇墙稳定性、对复杂地基(软弱土层较厚、岩层标高较高的地基)适应性、兼顾桩基基础、施工速度等方面更具备优势,且钢管板桩结构可更好的适应码头的大型化和深水化发展,在类似工程设计中可优先采用钢管板桩结构。 相似文献
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海上复杂地质条件下大直径钢管桩时效性试验研究 总被引:1,自引:1,他引:0
通过对3根海上复杂地质条件下的大直径钢管桩采取高应变初打与不同休止时间复打相结合的试验方法,得到不同休止时间钢管桩承载力、侧阻力及端阻力大小,以此对不同桩侧土及持力层对钢管桩时效性的影响进行了研究。研究结果表明:1)钢管桩承载力时效性现象明显,且随时间增长迅速; 2)钢管桩侧阻力的恢复系数远大于端阻力; 3)桩侧黏性土强度的恢复是钢管桩侧阻力增加的主要原因; 4)砂土层虽提供的侧阻力较大,但其对侧阻力增长的贡献不如黏性土; 5)持力层越硬,端阻力与承载力的恢复性越差。 相似文献
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文章介绍了东台海上风电项目大直径单桩采用翻身钳溜尾施工技术。通过solidworks建模进行计算和现场试验实测,翻身钳和钢管桩的应力应变满足要求。翻身钳溜尾施工提高了沉桩施工效率。 相似文献
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钢管桩基础是海洋导管架平台比较常用的一种基础形式,对钢管桩自由站立深度的准确预测是导管架平台安装项目中的一项重要工作。如果自由入泥深度评估不准确,现场施工时可能会导致钢管桩发生变形损坏,进而可能影响到整个油气田的生产运营。基于实际生产项目,讨论了钢管桩自由站立深度实际结果与预测值之间的关系,分析了造成实际结果的原因,论证了除自身结构性质外,钢管桩自由站立深度的影响因素主要包括海底地层性质和沉桩速度。海底浅部地层性质直接决定土对桩的承载力;沉桩速度决定土对桩的应力类型。实践表明,应用多种方法对钢管桩自由站立深度进行综合分析评价,能够考虑到多种影响因素,从而使评估工作更加全面,大大提高预测的准确度。 相似文献
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介绍了嘏基斯坦卡西姆港化学码头钢管桩实施牺牲阳极阴极保护所进行的钢桩保护面积计算和保护电位测量,以及根据涂层状况经设计计算,安装牺牲的阳极的型号、数量和阳极材料的性能检测。 相似文献
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本文介绍了用高应变法对某专用码头大直径钢管桩进行动力量测及CAPWAPC法计算分析结果,提出了单桩极限承载力及该地区停锤标准,供设计部门参考。 相似文献
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Zhu Guangyu Lu Tongsheng Tang Nianci Zai Jinzhang . Senior Engineer Research Institute of the Third Navigation Engineering Bureau Ministry of Communications Shanghai
. Lecturer Dept. of Communications Transportation Engineering Southeast University Nanjing
. Professor Dept. of Communications Transportation Engineering Southeast University Nanjing
. Associate Professor 《中国海洋工程》1991,(4)
Field measurements of driving resistances and heights of soil core during driving were made offshore and onshore of steel pipe piles. Measured data show that the height of soil core varies differently for piles of different diameters with the increase of penetration. Dynamic plugging could be assumed never to occur for steel pipe piles with diameters over 900 mm. Soil resistances at the time of continuous driving (SRD) are back analyzed from blow counts with an empirical distribution of resistances suppported by many early dynamic measurements. A method of predicting SRD is finally suggested. 相似文献
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A research on super-long piles has been primarily based on cast-in-place bored piles. In this article, field tests associated with selected measuring technologies were conducted on two super-long steel pipe piles in offshore areas to investigate the behaviors and performance of super-long steel pipe piles. The strain along the pile shaft was monitored by adopting the Brillouin optical time domain reflection and fiber Bragg grating techniques. Static load tests were also conducted on two test piles to determine the bearing capacities. In addition, the axial forces, relative displacements between piles and soils and pile shaft resistances were calculated based on the measured strain. According to the results of the static load tests, the ultimate bearing capacities of the two test piles are greater than 15,000 and 15,500 kN. Both of these values meet the design requirements. In addition, the two test piles can be treated as pure friction piles, and the load transfer mechanism and relationships between the pile shafts and relative displacements are also discussed. Finally, recommendations for practical engineering and significant conclusions are presented. 相似文献
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The sacrificial anode protection system for the steel pipe piles of the 3rd berth of Dandongwharf at Dandong port has operated for eight years.In this paper,the program design and the protectioneffect of the sacrificial anode protection system are presented.The results of various,inspections show thatthe piles are protected very satisfactorily. 相似文献