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某污水顶管工程深基坑专项施工组织设计
华东路污水管道工程
（4标顶管工程基坑围护部分）
基
坑
围
护
专
项
方
案
上海浦东城市建设实业发展有限公司
2009年12月15日
基坑围护专项施工方案
（H=-10m）
1、编制说明····························································5
1.1、工程概况····························································5
1.2、工程简介····························································5
1.3、编制依据····························································5
1.4、工程地质····························································6
1.5、原地面未降坡前顶管基坑相关参数······································7
1.6、井位周边构筑物·······················································8
1.7、工程过程的应急措施···················································8
2、SMW工法围护施工·················································9
2.1、施工工艺流程图······················································9
2.2、施工方法和技术保证措施···············································10
2.2.1、测量放样··························································10
2.2.2、地面降坡···························································10
2.2.3、开挖导向沟槽·······················································10
2.2.4、两两轴搅拌桩孔位定位··············································11
2.2.5、深层搅拌桩施工顺序················································11
2.2.6、两轴搅拌桩施工····················································11
2.2.7、插、拔H型钢·······················································12
2.2.8、施工技术措施·······················································13
2.2.9、基坑内降水及坑底土体加固施工······································14
2.2.10、基坑围护结构渗漏预防措施·········································14
3、基坑开挖及支撑·····················································15
3.1、围护桩顶围檁施工····················································15
3.2、分项工程施工方法····················································15
3.3、围檁施工注意事项····················································15
3.4、基坑开挖···························································15
3.5、基坑开挖前的准备工作················································16
3.6、基坑围护结构渗漏封堵措施············································16
3.7、钢支撑施工方法······················
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