上下水管道通过现浇钢筋混凝土楼板时,楼板需预留孔口。以往只用旧管子和一些物块,放在预留孔口位置上,临时用钉插上或卡住。当混凝上浇筑振捣时,极易产生位移或被卡住,不易脱模和剔除。可用旧管子截成一段,长度以混凝土厚度略高一些为宜,用一条长螺栓,在管子上做一个十字型卡具,见图。只要在需留孔口中心的木板上打一 When the upper and lower water pipes pass through the cast-in-place reinforced concrete floor, the floor needs to reserve an orifice. In the past, only the old tubes and some blocks were placed on the reserved orifices, and they were temporarily stuck or stuck. When vibrating on the concrete, it is easy to produce displacement or get stuck and it is not easy to remove and remove. The old pipe can be used to cut into sections. The length is preferably slightly higher than the concrete thickness. Use a long bolt to make a cross-type clamp on the pipe. See the figure. Just play on a board that needs to stay in the center of the hole