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在混凝土结构层上开洞，是整体浇注完后切割凿除开洞好，还是浇注混凝土前先设置好洞口 - 工程设计 - 项目管理 - 氿上知道
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1.浇筑前 提前预留出 因为后期再钻出来比较费工费时也浪费了部分混凝土 更重要的是对结构有影响降低承载力和稳定性 。
2.建筑前 制作一个200~400的钢管，在直径对称的地方焊接一个提子 留多大的洞用比它稍微大一点的钢管 然后放在预留的位置上，可提前画出位置并在位置上标注上尺寸。浇筑完成后 混凝土养护达到一定强度后就可以拔出钢管 一般养护两天就可以拿出来了