杯形基础混凝土浇捣完毕后,需要在杯口四周弹出吊装柱子校正轴线用的十字中心线。施工中一般采用通长拉线、手持线坠吊线、目测定位的方法。这种做法的缺点是:手持线坠有抖动,眼睛观察有偏差,通长拉线容易受风力影响,特别是当拉线比较长时,弹出的十字中心线往往不够准确。现介绍一种构造 After the cup-shaped foundation concrete is poured, it is necessary to pop the lifting column around the cup mouth to correct the cross center line for the axis. In the construction process, the method of length-draw wire, hand-held wire hanging and hanging wire, and head-measuring position are generally used. The disadvantages of this approach are: hand-held line falls with jitter, eye observation is biased, long-length cable is easily affected by the wind, especially when the cable is relatively long, the pop-up cross centerline is often not accurate enough. Now introduce a structure