复合改造方案在风机基础扩容中的应用研究

Application of composite renovation scheme in wind turbines foundation upgrading

针对老旧风机基础难以承担上部结构技改增效后的增幅荷载的难题,深入研究了改造后基础的薄弱部分,确立了基础改造效果的评价指标。同时以湖南某风场老旧基础环式风机基础为研究对象,对其扩容升级改造进行可行性研究,提出了一种环梁抱箍,并在环梁区域处施加围压的复合方案。通过数值分析研究不同围压参数对扩容风机基础的力学性能影响,得出围压参数最优组合并进一步对环梁尺寸进行优化设计。分析结果表明,环梁-围压复合基础扩容升级方案使得塔筒侧壁与基础混凝土的接触面积增大,从而增强了二者之间的相互作用,有效缓解了基础环底部的受力情况。同时,该方案还减少了基础环的位移量,增强了钢混结构的协同运动,使得基础能够承担更大的上部荷载,进而支撑此次扩容升级改造的完成。

Based on the practical need that the existing foundation of the outdated wind turbine cannot withstand the increased load resulting from the improvement and enhancement of the upper structure,a thorough investigation is conducted on the vulnerable aspects of the renovated foundation.Evaluation criteria for the effectiveness of the foundation renovation are established.At the same time,taking the existing ring-type foundation of a wind turbine in a specific wind farm in Hunan province as the research object,a feasibility study is conducted on its expansion,upgrading and transformation.A composite solution incorporating a hoop beam and applying circumferential pressure in the hoop beam region is proposed by conducting numerical analysis to investigate the influence of different circumferential pressure parameters on the mechanical performance of the expanded wind turbine foundation,an optimal combination of circumferential pressure parameters is determined.Subsequently,the dimensions of the hoop beam are further optimized through design.The analysis results indicate that the composite foundation expansion and upgrading scheme consisting of the hoop beam and circumferential pressure increases the contact area between the tower sidewall and the foundation concrete,thereby enhancing their interaction and effectively alleviating the stress on the bottom part of the foundation ring.At the same time,the scheme also reduces displacement,strengthens the coordination between the steel and concrete structures,and enables the foundation to accommodate larger loads from the upper structure,thereby supporting the completion of this expansion and upgrading project.