城市下穿立交雨水泵站进水管道塌陷处置技术

Disposal Technique of Intake Pipe Collapse in Urban Underpass Stormwater Pumping Station

以杭州市一座城市下穿立交雨水泵站进水管道塌陷处置为例,分析了管道塌陷的成因,创造性地提出了半开挖人工盾构套管施工技术,详细介绍了预制装配式混凝土(PC)工法组合钢管桩施工、管棚注浆加固、人工盾构掘进、钢套管安装、新管顶进、原位固化(CIPP)内衬等施工工艺。采用Plaxis有限元分析软件,建立U型槽、泵房、钢板桩、管棚等结构模型,仿真半开挖人工盾构套管施工过程,结合施工动态全过程监测数据,证实该技术安全可靠,对类似工程有一定的借鉴作用。

Taking the intake pipe collapse disposal in an urban underpass stormwater pumping station of Hangzhou as an example,this paper analyzes the causes of pipe collapse,puts forward the semi-excavated artificial shield casing technology creatively and elaborates the process of composite PC steel pipe pile construction,pipe shed grouting reinforcement,artificial shield tunneling,steel casing installation,new pipe jacking,CIPP lining,etc. Plaxis finite element analysis software was used to establish the structural models of U-shaped groove,pump house,steel sheet pile and pipe shed,etc.,to simulate the construction process of semi-excavated artificial shield tunneling. Combined with the dynamic whole-process monitoring data of construction,it was proved that the technology was safe and reliable,which could be used for reference in similar projects.