CALCULATION AND RESEARCH ON ULTIMATE TENSILE BEARING CAPACITY OF STEEL PIPE SPIRAL PILE FOR PV BRACKET FOUNDATION IN THE ROAD AREA OF TRANSPORTATION AND ENERGY INTEGRATION PROJECT
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摘要: 由于钢管螺旋桩具有极佳的经济性和适用性，其在许多光伏发电项目中都是光伏支架基础的首选形式，但国内两项钢管螺旋桩设计标准中关于其抗拔极限承载力的计算公式存在较大差异，在实际工程中如何选择更合理的标准困扰着工程设计人员。以某交能融合项目路域的光伏场区为例，通过现场试验得到了单根钢管螺旋桩的抗拔极限承载力数据，并将现场试验结果与不同标准下得到的计算结果进行了对比，根据对比结果给出了计算公式应用建议。研究结果表明：1)从现场试验结果来看，钢管螺旋桩桩径的增加对单桩抗拔承载力有一定的提高作用，但提高作用有限，性价比较低。若要提高单桩抗拔极限承载力，建议还是从增加叶片的道数或叶片直径的方向采取措施。2)在进行光伏发电项目设计时，若要估算单桩的抗拔极限承载力，建议采用DB41/T 2125—2021中的倒圆台承载模式的计算公式，得到的计算结果最保守也最接近现场实际情况。Abstract: Due to its excellent economy and applicability,steel pipe spiral pile are the preferred form of PV brackets foundation in many PV power generation projects. However,there are significant differences in the calculation formula for the ultimate tensile bearing capacity of steel pipe spiral pile between the two domestic design standards for steel pipe spiral pile. How to choose more reasonable standard in practical engineering is troubling engineering designers. This paper takes the PV field area of a certain transportation energy integration project as an example,and obtains the tensile bearing capacity data of a single steel pipe spiral pile through onsite tests. The on-site test results are compared with the calculation results obtained under different standards,and based on the comparison results,application suggestions for the calculation formula are given. The research results show that:1) From the on-site test results,it can be seen that increasing the diameter of steel pipe spiral pile has a certain improvement effect on the single pile’s ultimate tensile bearing capacity,but the improvement effect is limited,which is a low cost-effectiveness. To improve the tensile bearing capacity of a single pile,it is recommended to taking measures in the direction of increasing the number of blades or blade diameter. 2)When designing PV power generation projects,it is recommended to use the calculation formula for the inverted cone bearing mode in DB41/T 2125—2021 to estimate the ultimate tensile bearing capacity of a single pile. The calculated results are the most conservative and closest to actual situation on-site.
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