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目前在一些楼房中,经常出现楼面、天棚沿着板缝方向开裂的现象,这种裂缝不仅影响室内美观,更重要的是影响使用,出现这些问题主要有下列几点原因。 1.楼板在生产时本身质量不过关。一些楼板存在几何尺寸偏差过大,板面不平整,翘曲严重的现象,偏差超过了《预制混凝土构件质量检验评定标准》(CBJ321-90)中规定的平整度误差不超过5mm、翘曲误差不得超过l/750的要求。导致楼板铺设后,高低尺寸相差过大,使楼板或屋面板在板缝处抹灰层薄厚不一,灰浆凝固干燥过程收缩不均,这样就容易产生裂缝。
At present, in some buildings, the phenomenon of floor cracks and cracks along the cracks in the slab seam frequently occurs. This kind of crack not only affects the appearance of the interior, but also affects the use. These problems are mainly due to the following reasons. 1. The quality of the floor slabs during production is not critical. Some floor slabs have large geometrical deviations, uneven surface and serious warpage. The deviation exceeds the flatness error specified in the “Standard for Quality Inspection and Evaluation of Precast Concrete Components” (CBJ321-90) of less than 5 mm, warping error. Must not exceed the l/750 requirement. After the floor slabs are laid, the difference between the high and low dimensions is too large, so that the plastering layer of the floor slabs or roof slabs at the seams of the slabs is of different thicknesses and the mortar is not uniform in the solidification and drying process, so that cracks are easily generated.