市政道路地下综合管廊基坑回填施工存在的问题及质量控制措施

Problems and Quality Control Measures in Backfi lling Construction of Underground Comprehensive Pipe Gallery Foundation Pit for Municipal Roads

采用城市市政道路位于地上、综合管廊位于地下的共建模式,用明挖法开挖综合管廊的基坑时,综合管廊的基坑回填完成后即形成了道路的路基。基坑的回填质量不仅关系着管廊主体结构的保护,还对其上方道路工程的施工质量有重大影响。文章以贵阳市某新建的城市道路和其下方新建的地下综合管廊为例,分析当前综合管廊基坑回填存在的问题及原因,结合现有工程案例,提出了基坑回填过程中的管理和质量控制措施,以控制预期质量。

When the co-construction mode of urban municipal roads located above ground and comprehensive pipe galleries located underground is adopted,and the foundation pit of the comprehensive pipe gallery is excavated by the open excavation method,the subgrade of the road is formed after the foundation pit backfill of the comprehensive pipe gallery is completed.The backfill quality of the foundation pit is not only related to the protection of the main structure of the pipe gallery,but also has a significant influence on the construction quality of the road engineering above it.Taking a newly-built urban road and a new underground comprehensive pipe gallery built under it in Guiyang as an example,this paper analyzes the problems and causes of the current foundation pit backfill of the comprehensive pipe gallery,and puts forward the management and quality control measures in the process of foundation pit backfill in combination with the existing engineering cases,so as to control the expected quality.