预制楼板的楼面常因板块排列不匀、板底标高偏差较大和检查手段不力等原因,使预制楼板沿板缝开裂,出现楼面渗漏和顶棚粉刷脱落现象,影响了工程的正常使用。针对这种情况,自1986年以来,我们先后在20多栋住宅楼楼面用囤水法对板缝质量进行检验。凡用该法检验合格的板缝,楼面无裂缝、无渗漏,顶棚无脱落,用户反映良好。板缝囤水检验法一般在板缝混凝土灌至板面下30毫米处、灌缝混凝土强度达到设计要求强度的50%时进行。囤水检验前,板四周的相接部位用1:2.5水泥砂浆粉刷墙面,高50毫米,厚20毫米,门洞部位抹灰高50毫 The floor of a prefabricated floor often causes cracks in the prefabricated floor slabs along the slab seams due to uneven plate alignment, large deviations in the elevation of the bottom slabs, and poor inspection methods. Floor floor leakage and roof streaking occur, which affects the normal use of the project. In view of this situation, since 1986, we have successively tested the quality of board seams on the surface of more than 20 residential buildings. Wherever there is a plate joint that is inspected by this method, there is no crack or leakage in the floor, and there is no shedding in the ceiling. The user responds well. The method of board joints and muddy water tests is generally carried out when the board joints are filled with concrete up to 30 mm below the board surface, and the strength of the perforated concrete reaches 50% of the required strength of the design. Before the drowning test, the joints around the board were painted on the wall with 1:2.5 cement mortar, 50 mm high, 20 mm thick, and 50 mm high at the door opening.