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.
municipal roadsutility tunnelfoundation pit backfillbackfill machinery
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