自爬升电动抱杆组塔时输电铁塔受力特点及强度分析

Stress Property and Strength Analysis of Transmission Line Tower During Erecting Using Self-climbing Electric Holding Pole

为了满足输电线路施工装备轻小型、专业化理念的需求,研发了新型自爬升电动抱杆用于组塔施工,从而改变了现有杆塔的设计理念。将抱杆依附于主材上,无需借助外拉线即可保持稳定,通过自爬升系统将铁塔自下而上完成组装,适用于大型机械无法进场的特殊地形的铁塔组立施工。由于具有免拉线、自提升、高效吊装等优点,自爬升电动抱杆能够有效降低安全风险、减少用工量;铁塔组立施工完成后,仅需要将电动抱杆分段拆卸,即可通过人力或小型车辆运输至下一基铁塔处进行组塔,大大提高了输电线路机械化施工效率。但组塔时电动抱杆依附于主材,会对铁塔受力变形造成影响,建立电动抱杆组塔有限元模型,对组塔过程中铁塔主要构件进行受力分析。研究结果表明铁塔在施工时处于压弯状态,经构件压弯稳定承载力分析后发现铁塔所受外力远低于其承载力,施工过程对铁塔构件内力影响较小,自爬升电动抱杆可以安全使用。

The existing design concept of pole is changed and a new modular electric pole is developed to meet the requirement that small and light equipment for the transmission line construction. The modular electric pole is attached to the tower body to maintain the stability of the pole without relying on the outer cable,and it can climb along the tower through the self-climbing system to complete the tower assembly from bottom to top. The modular electric pole is suitable for the tower construction in special terrain that the large machinery cannot reach. The safety risk and labor can be reduced with the pole which contains free-cable,self-climbing,efficient lifting and other functions. After completing the tower upright work,the modular electric pole only needs to be disassembled in stages,and it can be transported to the next tower base by workmen or small vehicles. The force analysis of the tower shows that the tower is in the state of compression bending during construction. The analysis results show that the external force exerted on the tower is far lower than its capacity,and the modular electric pole can be used safely.