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二、楼地面工程通病9.预制楼板板缝开裂。防治:板缝下口宽度为30～40mm,走线管的板缝应为40mm,缝宽达到50mm时,缝内增加受力筋。施工中严格执行“隔层灌缝”的规定,板缝浇灌作为一道单独工序。灌缝前将板缝及周边清理干净,浇水湿润不少于24h。灌缝时先刷素水泥浆一道,随后用补偿收缩的C20细石混凝土灌
Second, floor ground common problem 9. Prefabricated floor slab cracks. Prevention: The width of the lower slot of the board seam is 30-40mm, and the slot of the cable pipe should be 40mm. When the slot width reaches 50mm, the force-reinforced ribs are added in the seam. During the construction, the “separation of the compartments” shall be strictly enforced, and the slab joints shall be treated as a single process. Before sewing, clean the seams and the perimeter of the board, and moisten the water for not less than 24h. When brushing the cement slurry together, it is then filled with C20 fine stone concrete with compensation contraction.