钢筋混凝土框架结构施工时 ,柱的纵向受力钢筋常发生水平偏位或扭转偏位。出现的位置 :一是基础伸出地面处 ,一是上下层柱楼板处。角柱、边柱比中柱较易发生偏位。引起柱子纵向受力钢筋偏位的原因有 :(1)柱的轴线放线不准确 ;(2)柱模板搭设撑拉不牢 ,尤其是上口的刚度差 ;(3)柱的钢筋 Reinforced concrete frame construction, the column longitudinal force often occur horizontal deflection or torsion deviation. Appear in the position: First, the foundation stretched out at the ground, one at the floor of the column floor. Corner posts, side posts more prone to deviation than the column. The reasons for the longitudinal stress of reinforcing bar caused by columns are as follows: (1) the axis of the column is inaccurate; (2) the column template is not well supported by braces, especially the rigidity of the upper opening; (3)