循泵坑凝泵坑施工作业指导书.doc 29页 - 原创力文档
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其中凝结水泵坑部位由于孔洞较深（底标高为-9.30m）， 循环水泵坑、凝结水泵坑地下结构施工作业指导书 为防止地下水渗入及雨水导致孔洞积水，在土方开挖完成后立刻施测出泵管并垫层浇筑部位具体位置，放置固定好泵管并垫层支模后立刻进行垫层浇筑。 凝结水泵坑垫层分两次施工，第一次施工完毕做好施工缝处理，按前半节所述垫层及超挖回填施工方法进行第二次施工。 由于受汽机基础开挖影响，本处超挖回填量较大，必须控制好定位放线环节，防止不必要的浪费。 4.3.1.2底板垫层模板用50×100mm木方，测量人员把垫层面标高投测在木方四角上，木方的顶面即为垫层浇筑完成面控制线。 4.3.1.3垫层砼：采用C20砼。
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