【Utilities – Civil Engineering Version】20181026

Thread Content

Column base positioning and setting out include (). A: Install two theodolites on the control stakes of two mutually perpendicular column axes, and use them to determine the positions of each column base along the axis directions (i.e., the intersection points of the column axis lines); this process is known as column base positioning. B: Drive four small positioning stakes, labeled a, b, c, and d, along the axes surrounding the column bases. These stakes should be placed outside the boundaries marked for foundation excavation, at a depth 1.5 times greater than that of the foundation, so as to serve as a reference for digging the pit and setting up the formwork. C: According to the dimensions indicated in the foundation details and the slope width of the foundation pit, use a special set square to mark the boundaries of the foundation pit excavation area, and lay out white chalk lines to guide the excavation process; this task is known as foundation marking. D: When setting out the column foundations, it should be noted that the axes of the columns are not necessarily the centerlines of those foundations; rather, they usually correspond to the centerlines used for form erection and lifting operations. In such cases, the axes of the columns need to be shifted in order to determine the actual centerlines of the column foundations. E: Use ink lines to mark the centerline and edge lines of the walls. Answer: ABCD