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雨搭或雨篷是悬臂结构,见图1、2。一旦倾覆力矩大于抗倾覆力矩就会翻下来,造成物毁人亡事故。当梁上砖墙未砌到抗倾覆力所需的皮数时,混凝土雨搭或雨篷板即使达到设计强度,也不能拆模撤支顶,必须待雨搭粱上的砖砌到所需皮数,混凝土达到设计强度的70%以上时,才能拆模撤支顶。不然,雨搭就能翻下来。倾覆力矩就是倾覆荷载p(集中荷载)及q(雨搭板、抹灰层的自重),它们分别为绕o点产生的力
Rain canopy or awning is cantilever structure, see Figure 1, 2. Once the overturning moment is greater than the anti-overturning moment, it will turn over and cause an accident. When the brick wall on the beam is not built up to the required number of skins for resisting the overturning force, even if the concrete rain ponton or the canopy reaches the design strength, it cannot be removed from the top and it is necessary to wait for the rain to reach the required brickwork. When the number of skins is more than 70% of the design strength, the top can be removed by removing the mold. Otherwise, the rain can be turned over. The overturning moment is the overturning load p (concentrated load) and q (the weight of the rain flap and the plaster layer), which are the forces generated around the o point respectively.