我公司在某钢铁厂炼钢车间大修中,根据该工程工期紧迫的要求,结合旧厂房的实际情况,采取不拆屋盖进行大批量换柱的施工工艺;并编制了相应的方案组织施工,安全、经济、快速地实现了大批量托梁换柱。一、工程概况该工程大修施工面积有5128m~2(图1)。要求折除(?)轴线的10根混凝土柱,改变柱距,重新做柱基础,另行吊装8根钢柱,增设屋架托梁;拆除(?)、(?)轴线的上柱,用钢上柱代替;保留(?)～(?)跨 In the overhaul of a steel plant of a steel plant, our company adopted the urgent requirements of the project, combined with the actual conditions of the old factory, and adopted a large number of column-changing construction processes without demolishing the roof; and prepared corresponding plans for organization and construction. Safe, economical, and rapid implementation of large quantities of joists. I. Project Overview The project has overhauled construction area of ​​5128m~2 (Figure 1). Requires dismantling of the 10 concrete columns on the (?) axis, changing the column spacing, re-doing column foundations, lifting 8 steel columns separately, adding truss joists; dismantling the (?), (?) axis on the column, on the steel Column substitution; retention (?) ~ (?) span