I. Introduction. CFG pile is the abbreviation of cement fly ash gravel pile, which is a pile body formed by vibrating machinery after mixing with water and mixing a mixture of cement, fly ash, gravel, and sand. CFG piles are widely used in soft foundation treatment engineering, and this paper will introduce and analyze the construction scheme of CFG piles in detail.
2. Preparation for construction.
1.Personnel allocation: According to the length and width of the construction section, the construction personnel are reasonably allocated, including pile driver operators, rebar workers, concrete workers, etc.
2.Material preparation: According to the construction drawings and engineering quantity, prepare enough CFG pile materials, including cement, fly ash, gravel, sand and other mixtures, as well as corresponding construction machinery and tools.
3.Technical preparation: familiar with the construction drawings, understand the site situation, prepare the construction plan, and make technical disclosure.
4.Site preparation: clean up the construction site, level the site, and ensure that the pile driver can operate normally.
3. CFG pile construction technology.
1.Pay-off: According to the design drawings, mark the pile position with white ash to ensure that the pile position is accurate.
2.Drilling: Use CFG pile driver to drill, and control the drilling speed and depth during the drilling process to ensure that the design depth is reached.
3.Stirring mixture: Mix cement, fly ash, gravel, sand and other mixtures evenly to ensure that the ratio of CFG pile materials meets the requirements.
4.Pouring mixture: Pour the stirred mixture into the hopper of the CFG pile driver for pouring. During the perfusion process, the perfusion speed and the uniformity of the mixture should be controlled.
5.Vibrating pile: After the pouring is completed, the cfG pile is fully compacted by vibrating machinery to reach the design strength.
6.Curing: After the pile is formed, it is necessary to carry out maintenance to ensure that the strength of the pile increases.
Fourth, construction precautions.
1.During the construction process, it is necessary to strictly control the drilling speed, depth, mixture ratio, pouring speed and other parameters to ensure that the CFG pile meets the design requirements.
2.During the construction process, it is necessary to pay close attention to the situation on the construction site, and if abnormal situations are found, measures should be taken to deal with them in time.
3.After the pile is formed, a quality check should be carried out, and if a quality problem is found, it should be repaired in time.
4.During the construction process, it is necessary to ensure the safety of the construction site, comply with the safety operation procedures, and prevent the occurrence of safety accidents.
V. Conclusions. CFG pile is a commonly used soft foundation treatment method, which is widely used in engineering. During the construction process, it is necessary to strictly abide by the construction specifications to ensure the quality of construction. Through the introduction and analysis of this article, we hope to have a deeper understanding of the construction scheme of CFG piles. At the same time, it is also hoped to provide a certain reference value for similar projects.