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[问]我们这里有一栋办公楼,在交付使用时楼板没有出现问题,但是在安装设备后楼板出现大面积的裂缝,缝很小,数目很多。设计板筋都是直径12mmⅡ级钢筋;混凝土强度有试验报告,试验结
[Q] We have an office building here. There are no problems with the floor slab when it is delivered. However, there are large cracks in the floor slab after installing the equipment. Design plate are 12mm in diameter are Ⅱ grade steel; concrete strength test reports, test results