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为提高工效,构件在翻身、起吊过程中,多采用一次绑扎连续作业。某些刚度较弱的构件,为满足在翻身、起吊等阶段的强度和抗裂度要求,吊索上还要加设滑轮,这就带来了空中稳定平衡的问题。根据力的平衡原理,采用两点绑扎法加滑轮后的构件,在起吊后,其重心必须落在吊钩的铅垂线上;而且两根吊索与通过吊钩的铅垂线的夹角要相等,这是构件的平衡条件。但构件在吊装过程中,其绑扎点不可能使两夹角完全相等,在空中也难免不碰撞其他构件,这就要求构件在满足平衡条件的情
In order to improve the work efficiency, the components are continuously used for one continuous operation in the process of turning and lifting. Some weaker components, in order to meet the requirements of strength and crack resistance in the stages of turning, lifting, etc., additional pulleys should be added to the slings, which brings stability and balance in the air. According to the principle of force balance, the two-point banding method is used to add the components after the pulley. After lifting, its center of gravity must fall on the vertical line of the hook; and the angle between the two slings and the vertical line passing through the hook. To be equal, this is the equilibrium condition of the component. However, during the hoisting process of components, it is impossible for the lashing points to completely equalize the two included angles, and it is inevitable that they will not collide with other components in the air. This requires that the components meet the equilibrium conditions.