论文部分内容阅读
水泥粉煤灰碎石桩不仅可用于承载力较低的地基,也可用于承载力较高但变形不能满足要求的地基,具有较强的置换作用,如果施工过程中的各个环节控制得当,不仅施工进度快(长9m、直径50cm的桩,从开始钻孔到灌注结束平均可达3～4根/h),施工质量也能很好保证。但如果处理较薄的地基时,则不宜采用CFG桩处理,而应采用换填方法,另外,由于要做桩基复合地基承载力检测和桩身完整性检测,复合地基承载力检测难度较大,检测费用较高。结合南水北调中线焦作2段5标CFG施工情况,本文从施工程序、施工流程、技术要求、施工过程质量控制、质量检验、施工中注意事项等方面阐述了CFG桩基在施工过程中的质量控制方法和程序,明确了CFG桩基处理地基的优缺点,可以根据实际地质和设计要求有选择的采用。
Cement-flyash gravel pile not only can be used for foundation with low bearing capacity, but also can be used for high bearing capacity but the deformation can not meet the requirements of the foundation, with a strong displacement effect, if the construction process of all aspects of control properly, not only Construction speed (9m long, 50cm diameter pile, from the beginning of drilling to an average of up to 3 ~ 4 / h), the construction quality can be well guaranteed. However, when dealing with thinner foundations, CFG pile should not be used for treatment, but should be replaced by replacement method. In addition, due to the bearing capacity of pile foundations and pile integrity testing, bearing capacity of composite foundation is difficult to detect , Testing costs are higher. Combined with the construction of 5 standard CFG for the second stage of Jiaozuo Middle Route of South-to-North Water Diversion Project, this paper elaborates the quality control methods of CFG pile foundation during construction from the aspects of construction procedure, construction flow, technical requirements, quality control of construction process, quality inspection and precautions in construction And procedures, clear the advantages and disadvantages of CFG pile foundation treatment, can be selected according to the actual geological and design requirements.