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This paper considers the pull rod for the tower crane as an elastic support, and optimizes the pull point on the jib by using the vertical and horizontal bending theory in various connection forms. 本文将塔式起重机水平动臂的拉杆作为一弹性体支承，利用挠曲线的微分方程分析并推导出动臂在不同连接型式下的纵横弯曲的计算公式。