钢筋混凝土预制空心板,在建筑中广泛使用,出厂前板的两端圆孔要求堵塞,一般采用碎砖水泥砂浆,结构上要求堵塞面至板端留出3厘米距离,如图1所示。施工时确实有些困难。实际上有的产品出厂前未作任何处理。有的虽用碎砖水泥砂浆堵塞了,但做成与板端平齐,减少板与板和板与梁 Reinforced concrete prefabricated hollow slabs are widely used in buildings. The round holes at the two ends of the factory are required to be plugged. Generally, crushed brick cement mortar is used. The structure requires a 3 cm distance between the plugging surface and the plate end, as shown in Figure 1. There are some difficulties in construction. In fact, some products are not processed before delivery. Some of them are clogged with smash brick cement mortar, but are made flush with the plate ends, reducing plates and plates and plates and beams.