为展示后浇带施工过程质量安全管理措施，防范随意变更或取消后浇带、后浇带模板支撑体系搭设不规范、后浇带擅自提前封闭等行为，推动全市项目贯彻落实《关于加强后浇带施工质量管理的通知》文件要求，6月26日，厦门市质安站在厦门市建安集团有限公司承建的岭兜安置房项目C08地块组织后浇带施工专项观摩活动。
后浇带施工做法
01
专项方案编制和审核
编制后浇带专项施工方案，明确钢筋及传力梁安装、防水节点及混凝土施工工艺、后浇带封闭时间与条件、模板支撑体系搭设方案、质量验收标准等，经审批后实施。施工前组织方案交底、技术交底。
02
按设计图纸留设
后浇带是为适应环境温度变化、混凝土收缩、结构不均匀沉降等因素影响，在结构中预留的具有一定宽度且经过一定时间后再浇筑的混凝土带，是避免施工期收缩裂缝的有效措施，必须按照规范及设计文件要求留设。
03
止水带及细部构造
对转角、“T”型搭接、“十”字搭接等节点部位的止水钢板，提前根据设计图纸进行预加工，有效降低后浇带渗漏隐患。
04
模板支架搭设和拆除
后浇带处模板支撑与其两侧梁、板结构的模板支撑分开独立设置，且在混凝土强度达到设计强度方可报批拆除。不得单独使用素混凝土构造柱支撑。
05
限制堆载和安全防护
后浇带两侧设挡水坎、铺设钢板刷警示漆，沿后浇带支撑架外侧纵向立杆拉设警戒带和禁止标识防止误拆、撞击，后浇带两侧梁板跨内不得作为材料堆放、加工场所。
06
行车洞口预留
为防止后浇带支撑拆除后回顶的情况，提前在后浇带支撑搭设阶段留设行车洞口，洞口选择在地下室运输便利且位于楼板受力较小区域的位置，采用工字钢转换层作为洞口部位模板基础。车辆需跨越后浇带的要采用垫钢板、防撞墩或护角条等防止撞击倾覆、碾压破坏措施。
07
封闭前处置流程及验收
后浇带封闭前，参建各方联合组织隐蔽前条件验收，主要有判定沉降稳定、混凝土配合比、接缝处混凝土凿毛、钢筋调直除锈、垃圾清理、模板支架验收等。
08
混凝土浇筑及养护
填充后浇带，可采用微膨胀混凝土、强度等级比原结构强度提高一级，并保持至少14d的湿润养护。
据悉，这是全市首次聚焦后浇带施工开展的单项实体精细化观摩，从后浇带的专项方案编制和审核、按设计图纸留设、止水带细部构造、模板支架搭设和拆除、限制堆载和安全防护、行车洞口预留、封闭前工序及验收、混凝土浇筑养护等环节出发，精准解决后浇带施工过程普遍存在的质量安全难点，对进一步提升后浇带施工质量、减少渗漏隐患有重要指导意义。
岭兜安置房项目-C08地块总建筑面积74237.46㎡，地下2层，地上24~33层，建设单位厦门思明城建工程建设有限公司，代建单位厦门兆旭建设发展有限公司，施工单位厦门市建安集团有限公司，监理单位厦门基业衡信咨询有限公司。
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郝农仁3362后浇带混凝土施工应注意哪些问题? -
茹剂定18482419828 ______ 后浇带混凝土施工应注意: (1)后浇带的留置宽度一般700-1000mm,现常见的有800mm、1000mm、1200mm三种. (2)后浇带的接缝形式有平直缝、阶梯缝、槽口缝和X形缝四种形式. (3)后浇带内的钢筋,有全断开再搭接,有不断开另...
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郝农仁3362楼梯间怎样留后浇带
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郝农仁3362后浇带的作用 -
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郝农仁3362基础以下要设置沉降后浇带吗 如果设置回填土后怎么能浇筑呢 谢谢 -
茹剂定18482419828 ______ 要设置.回填土影响的是地下室外墙.
郝农仁3362混凝土结构后浇带设计和施工如何进行?
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郝农仁3362关于后浇带的问题?
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郝农仁3362后浇带怎么理解 -
茹剂定18482419828 ______ 为防止现浇钢筋混凝土结构由于温度、收缩不均可能产生的有害裂缝,按照设计或施工规范要求,在板(包括基础底板)、墙、梁相应位置留设临时施工缝,将结构暂时划分为若干部分,经过构件内部收缩,在若干时间后再浇捣该施工缝混凝土,将结构连成整体.后浇带是既可解决沉降差又可减少收缩应力的有效措施,故在工程中应用较多. 设置后浇带的位置、距离通过设计计算确定,其宽度考虑施工简便、避免应力集中,常为800~1200mm;在有防水要求的部位设置后浇带,应考虑止水带构造;设置后浇带的部位还应该考虑模板等措施不同的消耗因素;后浇带部位的混凝土强度等级须比原结构提高一级.
