为保证建筑工程地基土不受扰动,施工单位在用反铲挖机挖基坑土时,一般均留设厚150~300 mm的土用人工开挖。经试验,通过采取严格的土面标高控制措施,精巧地操作反铲挖机、再配合少量人工铲平的做法,同样能达到“地基土不受扰动”的质量要求。经有关专业部门对样本工程验收鉴定,此类挖土做法非常具有现实意义和经济价值,可为建筑工程基坑开挖提供借鉴。 In order to ensure that the foundation soil of the construction project is not disturbed, the construction units generally leave artificial excavation for soil with a thickness of 150-300 mm while digging the foundation pit with backhoe excavation. The test, by taking strict measures of soil surface elevation control, sophisticated operation of backhoe digging machine, combined with a small amount of manual shoveling practices, the same can be achieved “foundation soil undisturbed ” quality requirements. The professional departments of the sample project acceptance assessment, excavation of such practices is of great practical significance and economic value, can provide reference for construction excavation.