Construction Control of Composite Support System for Foundation Pit of Rainwater Pumping Station
In order to analyze the construction control of the composite support system for the foundation pit of the rainwater pumping station,based on the No.14 Rainwater Pumping Station Project in Jinzhong Street District of Dongli District in Tianjin,the construction control points of the composite support system were analyzed based on the important and difficult points of the foundation pit supporting for the rainwater pumping station.The prac-tice shows that the foundation pit of the rainwater pumping station is deep and difficult to support,especially when the foundation is located in the silty clay layer,the excavation is difficult.The single support technology is difficult to realize the effective support for the deep foundation pit.In order to improve the supporting effect of foundation pit,the composite support system is adopted.First,the foundation is strengthened by the bored pile with a spacing of φ 1 000 mm and 1 200 mm,and the water curtain of the three-axis mixing pile with a spacing ofφ 850 mm and 600 mm is set on the outside to reduce the influence of groundwater on the support system.The in-ternal support system is a 420 mm×420 mm latticed column structure.Meanwhile,the monitoring and control of foundation pit supporting are strengthened during construction.According to the monitoring results,timely ad-justment of construction parameters can better ensure the stability of the foundation pit of the pumping station and promote the smooth completion of the construction task of the rainwater pumping station.
rainwater pumping stationfoundation pit supportinghorizontal support
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