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This article focuses on reinforced concrete structures in construction operations during the concrete pouring, Why is there construction joints, and the construction dried up between the time did not exceed, over time cement initial setting of these two cases the construction joint approach. With the work of the actual situation to be, for example, the beam structure of the proposed construction joints stay for a few reference recommendations. And the construction joint cracks in the analysis of the issue, given the guarantee that the quality of construction joint measures.