为解决盖挖逆作法地铁车站钢管混凝土柱的垂直度施工偏差问题，以某地下3层3跨地铁车站实际工程为例，对钢管混凝土柱的垂直度偏差处理进行研究。某盖挖逆作法地铁车站施工的钢管混凝土柱，负1层至负3层柱底向车站横断面方向的偏移量分别为114、254、375 mm，向车站纵向的偏移量分别为44、68、93 mm，垂直度偏差超出了《地铁设计规范》及《钢管混凝土结构技术规范》的要求，需要对倾斜的钢管混凝土柱进行置换处理。主要措施如下： 1）采用混凝土与钢管柱联合支撑的方式对置换结构进行临时支撑； 2）拆除钢管混凝土柱时，采用静力拆除与人工剔除相结合的方式，保留原梁、板内的钢筋； 3）新增钢管顶加强环与负1层柱顶原加强环顶紧，并采用螺栓与焊接连接的方式进行可靠连接； 4）施工全过程采用自动化变形监测与应变监测相结合。实践表明置换方案合理可行。
For a metro station constructed with the cutandcover topdown method, if the
perpendicularity of the concretefilled steel tubular
columns does not meet the requirements of relevant specifications, the
perpendicularity deviation must be corrected. The perpendicularity deviations
of the concretefilled steel tubular columns of the
first underground floor to the third underground floor toward the horizontal crosssection
direction of the station reach 114, 254, and 375 mm, respectively, those toward
longitudinal direction reach 44, 68, and 93 mm, respectively, which is beyond
relevant requirements, showing that concretefilled
steel tubular columns should be replaced. The main measures adopted are as
follows: (1) temporary support is provided for the replacement structure by the
joint support of concrete and steel tubular columns; (2) when removing the
concretefilled steel tubular columns, a combination of
static and manual removal is used to retain the original beams and steel bars
in the plate; (3) the newlyadded steel pipe top
reinforcement ring and the original reinforcement ring of column top of the
first underground floor are tightened, bolted, and welded to ensure the
reliability of the connection; and (4) the automatic deformation and strain
monitoring should be conducted during the whole construction process. The
practice shows that the replacement scheme is reasonable and feasible.
