04A-地下室底板施工方案

编号：CCTEBC-WXCH-01-04-A中中建建三三局局建建设设工工程程股股份份有有限限公公司司杭杭州州华华润润新新鸿鸿基基万万象象城城购购物物中中心心项项目目总总承承包包工工程程地下室底板施工方案编制人：审核人：审定人：2008年01月29日ＸＸＸＸＸＸ工程塔吊安装拆除方案华润新鸿基万象城购物中心项目总承包工程地下室底板施工方案1目录1.工程概况····································································································12.编制依据····································································································13.地下室底板施工部署·····················································································13.1地下室底板施工的重点与难点·······························································13.2施工部署··························································································24.地下室底板施工方法·····················································································24.1地下室底板钢筋工程···········································································34.2底板墙、柱竖向构件插筋固定·······························································44.3地下室底板模板工程···········································································54.4地下室底板混凝土工程········································································54.4.1混凝土浇筑的布置······································································54.4.2混凝土施工方法·······································································124.5地下室底板后浇带施工······································································144.5.1后浇带施工工艺·······································································144.5.2后浇带留置时间·······································································154.5.3后浇带的保护和排水·································································154.5.4后浇带的封闭··········································································154.5.5后浇带施工要点·······································································154.5.6地下室底板牛腿支座施工···························································164.5.7底板留设深井封闭····································································175.地下室底板施工的质量控制保证措施·····························································176.地下室底板施工的抗渗防裂措施···································································186.1通过优化施工方案、加强施工管理，确保各施工段不出现冷缝···················186.2采取测温控温措施，控制混凝土内外温差。···········································186.2.1平面测温点布置：····································································186.2.2竖向点布置：··········································································196.2.3测温频率················································································196.3混凝土的养护··················································································207.地下室底板施工的管理措施·········································································217.1现场施工管理措施············································································217.2搅拌站商品砼供应管理措施································································217.2.1生产管理················································································217.2.2运输车辆的配备与调度······························································217.3建立验收、申报制度·········································································218.地下室底板施工的安全保证措施···································································22ＸＸＸＸＸＸ工程塔吊安装拆除方案华润新鸿基万象城购物中心项目总承包工程地下室底板施工方案11.工程概况华润新鸿基万象城购物中心项目位于杭州市钱江新城，东临富春路，北靠规划的9号路，西至钱江路，南为江锦路，地铁从场地中穿过。占地面积34409㎡，总建筑面积242845㎡（不含架空层2541㎡），其中地上六层，高约45米，均为商业用房，建筑面积132328㎡（不含架空层2541㎡）；地下三层，包括部分商业用房、机动车库及设备房，部分车库同时兼做人防，地下建筑面积110517㎡。本工程基础采用灌注桩＋承台＋大底板基础形式，面积约34000㎡，大面积底板厚度为1000mm，承台高度为1500mm，承台及底板混凝土强度等级为C35，抗渗等级为S10，局部为S8；底板大面钢筋HRB400Ф25@150双层双向钢筋网。由于整个地下室两个方向尺度均较大，根据设计要求不设结构缝，为防止混凝土硬化时产生的收缩裂缝，在地下室底板中施加预应力，另设计在底板布置了4条膨胀带。2.编制依据《建筑地基基础设计规范》GB50007-2002《建筑地基基础工程施工质量验收规范》GB50202-2002《混凝土结构工程施工质量验收规范》GB50204-2002《地下防水工程质量验收规范》GB50208-2002《建筑给排水及采暖工程施工质量验收规范》GB50242-2002《建筑工程施工质量验收统一标准》GB50300-2001《建筑电气工程施工质量验收规范》GB50303-2002《浙江省建筑基坑工程技术规程》DB33/T1008-2000《钢筋焊接及验收规程》JGJ18-2003《型钢混凝土组合结构技术规程》JGJ3-2003《建筑施工安全检查标准》JGJ59-99《建筑工程冬期施工规程》JGJ104-973.地下室底板施工部署3.1地下室底板施工的重点与难点1、本工程的基坑支护体系较为复杂，围护结构采用钻孔灌注桩、混凝土角支撑、钢管水平支撑、混凝土斜支撑、土钉拉锚等支撑体系；基坑北面与住宅基坑紧密相邻。其中钢管水平支撑与混凝土斜支撑将撑在底板混凝土牛腿上。ＸＸＸＸＸＸ工程塔吊安装拆除方案华润新鸿基万象城购物中心项目总承包工程地下室底板施工方案22、基坑面积大且地下土质条件不理想，水平材料运输比较困难；往往需要二次转运；基坑地下土质多数是砂土且含水量较高，对施工地下室底板影响较大。3、围墙距基坑边平均距离不到4m最近的只有约2m，地下室大底板混凝土浇筑时场地内只有1号门能够供混凝土搅拌车出入。3.2施工部署本工程大底板以后浇带为界分为14块，根据挖土先后顺序依次施工。具体施工顺序详见下图。3-23-43-33-1底板施工顺序：12341-11-21-31-45底板施工工序流程：土方开挖至设计标高→垫层、砖胎模施工→底板防水施工→后浇带加强带施工→预留劲性钢柱定位安装→底板钢筋绑扎、预应力筋铺设→后浇带侧模封闭→混凝土浇筑养护。4.地下室底板施工方法由于本工程的底板防水工程由业主指定分包进行施工，因此，底板施工仅对钢筋、模ＸＸＸＸＸＸ工程塔吊安装拆除方案华润新鸿基万象城购物中心项目总承包工程地下室底板施工方案3板、混凝土以及后浇带节点等工程进行介绍。底板防水采用4.0厚BAC双面自粘防水卷材，防水工程在垫层施工结束后进行施工。4.1地下室底板钢筋工程本工程的底板钢筋均采用HRB400Φ25钢筋，横向间距与纵向间距均为150mm。在牛腿范围内厚度为1.5m的底板处支撑立柱采用L50×3角钢，角钢立柱上需焊3mm厚钢止水片；在1m厚的底板区域内支撑立柱采用HRB400Φ25钢筋，支撑水平横梁均用HRB400Φ25底板上层钢筋代替（局部需调整位置）。立柱间距均为2100mm。以1.5m厚底板区域为例具体如下图所示1.5m厚底板处钢筋支架平面布置图ＸＸＸＸＸＸ工程塔吊安装拆除方案华润新鸿基万象城购物中心项目总承包工程地下室底板施工方案4钢筋的连接形式均采用直螺纹。直螺纹连接如下图所示：2131-已连接的钢筋3-未连接的钢筋2-直螺纹套筒1-已连接的钢筋2-直螺纹套筒3-未连接的钢筋直螺纹连接示意图4.2底板墙、柱竖向构件插筋固定底板钢筋绑扎完毕后，根据相关图纸要求，应在板面钢筋准确定位出剪力墙、柱子、楼梯、坡道等需要留设插筋的部位。插筋的固定：插筋上部采用钢筋电焊固定，并根据现场实际情况，采用钢筋斜撑