Comprehensive residential building’s deep foundation pit project of Mattel,outside the foundation pit of foundation pit precipitation +irrigation schemes are described,introduces the construction technology of foundation pit precipitation in recharging points and points for atten-tion,pointed out that the scheme ensured the safety of foundation pit and surrounding buildings,achieved good social and economie benefits.%以美泰综合住宅楼深基坑工程为背景，对基坑内降水＋基坑外回灌方案进行了阐述，介绍了基坑降水回灌技术施工工艺要点及注意事项，指出采用该方案确保了基坑支护及周边建筑物的安全，取得了良好的社会和环境效益。
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