摘   要：某剪力墙结构高层住宅楼群因电梯选购滞后于该住宅楼的设计和施工，导致电梯曳引机底座支撑工字钢及两端槽钢枕头梁与电梯机房两根钢筋混凝土柱发生位置冲突，须凿开这两根柱子，以插入曳引机底座钢梁。采用有限元法评估电梯安装工况下凿断柱子后上部结构的承载力和正常使用工况下部分柱筋永久截断后对机房承载力的影响，研究了相应的施工方案，最终通过钢管临时托换和膨胀细石混凝土填筑的方法，达到安全及施工便利的目的。

Abstract: Since the order of elevator lagged behind the design and construction of 8 shear wall structural high-rise domestic buildings, which caused a site conflict between the steel pedestal steel beams of the elevator traction machines and two existing RC columns, so the columns may need to be fully cut off. Then, the bearing capacity of components after the two RC columns were cut off was estimated and the adverse effects of cutting off part of rebars in the columns are studied. Finally, a construction schedule using the technology of temporary underpinned steel tubes and filling with expansive concrete was designed and carried out to achieve safe and convenient purpose.