管沟支护施工方案(专家评审后修改)1

昆明经济技术开发区信息产业基地2号路南延线（下段）工程深基坑支护施工方案深圳市深安企业有限公司1目录一、工程概况······················································································3二、土质情况······················································································31、地质情况·························································································3三、施工计划、进度·············································································41、钢板桩施工计划··········································································42、现场施工生产进度情况·······································································43、进度保证措施·············································································5四、项目管理机构················································································5五、1、机械、劳动力、材料··································································6(一).机械配备···················································································6(二).劳动力组织················································································6(三).材料组织···················································································7六、管沟施工工艺流程··········································································7七、沟槽开挖······················································································81、沟槽支护方法选型·······································································82、测量放线························································································103、打入钢板桩·····················································································114、钢板桩引孔·····················································································115、沟槽开挖与支护···············································································116、砂石垫层····················································································127、回填土···························································································128、拔出钢板桩·····················································································12八、拉森钢板桩支护结构验算·······························································13九、基坑监测措施··············································································14十、质量保证措施·················································································151、工程测量························································································152、基坑土方回填质量保证措施································································16昆明经济技术开发区信息产业基地2号路南延线（下段）工程深基坑支护施工方案深圳市深安企业有限公司2十一、雨季施工····················································································16十二、安全文明····················································································17十三、应急预案····················································································181、编制目的························································································182、应急救援抢险组织机构······································································183、应急预案的准备、防护用品································································184、应急救援措施··················································································19十四、管沟施工总体计划（见后附）·························································21昆明经济技术开发区信息产业基地2号路南延线（下段）工程深基坑支护施工方案深圳市深安企业有限公司3一、工程概况本工程污水管沟深基坑（开挖深度5m以上）位于道路北侧K3+430～K3+850，总长420m。管道采用钢筋混凝土管，检查井采用钢筋混凝土结构，采用HRB335和HP235钢筋，抗渗等级为S6；管道基础垫层为砂垫层150mm；填料均为现场沟槽开挖土方。按抗震设防烈度8度采取抗震构造措施。管沟采取结构自重及覆土重量抗浮设计方案，本工程管沟结构环境类别为地面以下部分为二类a；主要通过抗渗混凝土，合理级配，优质外加剂，合理设置施工缝，科学的设计和施工解决。由于污水管管沟位于人行道下方，除特殊路段外，基本不进行地基处理。二、土质情况1、地质情况土质情况：根据设计图纸地形地貌及地层结构描述及现场清表土探挖情况，地貌单元为滇池冲湖积平原边缘河流浸蚀堆积地貌。场地组成为人工填土，第四纪冲，积洪积粘性土、湖积粘性土，局部夹泥炭质土等。现按层序分序如下：①素填土：杂色，以粘性为主土质不均匀，较杂乱，松密不一。局部地段夹有碎石。本层厚度0.8m～4.1m全场分布②-1粘土：褐灰～黄褐色，硬塑～可塑，中压缩性土。土质较均，光滑，干强度和韧性高，无摇振反应，含氧化铁斑点，局部分布。②-2粘土：褐黄～褐灰色，可塑～软塑，高压缩性土，土质较均，光滑，干强度和韧性高，无摇振反应，含氧化铁斑点，本层厚度0.7～1.65m，全场分布②-3泥炭质土、有机质土、淤泥质粉质粘土：黑色～灰色，很湿，软塑～流塑，属高压缩性土，土质不均，所含职务残体保存较好，味臭，富含有机质。本层1.70m～2.00m局部分布。③圆砾及砾砂：深灰～灰褐色局部呈现半胶结状，含少量卵石，一般粒径2～20mm，最大粒径150mm，呈亚圆形或菱角形，岩性有砂岩、粉砂岩，玄武岩，灰岩等组成砾石之间充填着粘性土和沙土，砾石含量约占50～60﹪，受中等风化或强风化，夹有粘性土，粉土，砂形土透镜体较多，稍密中密，全场分布。昆明经济技术开发区信息产业基地2号路南延线（下段）工程深基坑支护施工方案深圳市深安企业有限公司4③A-粉土、砂土：褐灰～灰色，很湿，中密，摇振反应迅速，无关泽反应，干强度和人性低，局部混砾石，本层0.8m～10.4m，呈夹层或透镜状分布。③B-粘性土：岩性为粉质粘土和粘土，黄灰～灰色，可塑状，光滑～稍有光滑，干强度和韧性高～中度，无摇振反应，局部混有砾石，、强风化岩石等，本层厚度0.60m～10.50m，呈夹层或透镜状分布。地下水源水位埋深0.2~4.3m，加上周边人类活动用水，地表河流、农田灌溉使用水源渗漏，导致沟槽开挖水源汇集，易造成沟槽边坡土方崩塌。三、施工计划、进度1、钢板桩施工计划k3+430～575、820～850段管道埋深深度为5～6m，嵌固深度为6～7m，根据现场地质和地质报告、深基坑支护计算书及钢板桩支护图，应选择IV12m钢板桩，双拼HW200*200H型钢作为钢围檩，单根型钢长6m，设一道φ377*10钢管支撑钢板桩（详见5～6m深基坑支护图），才能满足规范要求。k3+370～640，k3+785～850段管道埋深深度为6～7m，根据现场地质和地质报告、深基坑支护计算书及钢板桩支护图，应选择择IV12m钢板桩，双拼HW200*200H型钢作为钢围檩，单根型钢长6m，设二道φ377*10钢管支撑钢板桩，两道钢板桩间距为3.5m（详见6m以上深基坑支护图），才能满足规范要求。k3+640～785段管道埋深深度为7～7.6m，根据现场地质和地质报告、深基坑支护计算书及钢板桩支护图，应选择择IV12m钢板桩，双拼HW200*200H型钢作为钢围檩，单根型钢长6m，设二道φ377*10钢管支撑钢板桩，两道钢板桩间距为3.5m（详见6m以上深基坑支护图），才能满足规范要求。2、现场施工生产进度情况污水管管沟现场施工根据管沟分布的情况，分4个施工段具体如下：施工段1：2011年3月1日至2011年3月20日，施工K3+430～K3+630部分；施工段2：2011年3月15日至2011年4月5日，施工K3+630～K3+730部分；施工段3：2011年3月20日至2011年4月20日，施工K3+730～K3+830部分；昆明经济技术开发区信息