超深基坑降排灌一体化系统施工技术

Construction Technology of Integrated System of Dewatering,Drainage and Recharge for Ultra-deep Foundation Pit

结合工程实际,对复杂周边环境条件下的基坑降水、排水、坑外回灌及水资源利用技术进行了创新。利用首道支撑封板结构找坡,合理布置大口径排水地漏,采用气动降水泵结合土方开挖部署合理布置排水管线,将降水统一收集至大储量储水池,对水质进行有害物质净化处理,在基坑外设置回灌井,保持基坑外水位平衡,实现了基坑降水的存储、利用、净化处理、再利用,取得了良好的环境效益,可供类似工程借鉴。

Combined with the engineering practice,the technologies of foundation pit dewatering,drainage,recharge outside the pit and water resources utilization under complex surrounding environment are innovated.Use the first support sealing plate structure to make slope,reasonably arrange large-diameter drainage floor drains,reasonably arrange drainage pipelines by using pneumatic dewatering pumps in combination with the deployment of earth excavation,collect the precipitation to the large reserve water storage tank,purify the water quality of harmful substances,set a recharge well outside the foundation pit,maintain the water level balance outside the foundation pit,realize the storage,utilization,purification and reuse of foundation pit precipitation,and achieve good environmental benefits,which can be used as reference for similar projects.