CFG pile is the abbreviation of cement fly ash gravel pile, which is a high bond strength pile formed by mixing cement, fly ash, gravel, stone chips or sand and other mixtures with water. CFG pile is a good foundation treatment technology, which is suitable for treating cohesive soil, silt, sand, artificial fill and silty soil. Let's take a look at the construction process of Yangxin CFG pile.
1. Construction preparation.
1.Site preparation: Before construction, the above-ground and underground obstacles in the site should be removed.
2.Material preparation: calculate the quantity of various materials according to the construction drawings, and do a good job of cement, fly ash, gravel and other materials of the certificate and inspection report and other information.
3.Preparation of construction machinery: select the construction technology of drilling rig and CFG pile according to the requirements of pile length, pile diameter and single pile bearing capacity.
Second, the construction process.
1.Measurement and lofting: Measure the scope of the site according to the design drawings, and release the control points, and then carry out the pile position measurement and release.
2.Drilling rig in place: The drilling rig should choose machinery with good performance to ensure the stability, verticality and diameter of the drilling rig, and review it after the drilling rig is in place.
3.Stirring into piles: After the drill bit reaches the design elevation, start the mixer, use the mixer to pump the clay slurry, and at the same time use the mud pump to inject the mud into the pile hole until it is lifted to the ground.
4.Repeated stirring sinking: Turn off the slurry pump, rotate the drill bit in situ and sink repeatedly to the design depth.
5.Stirring and lifting: pump the cement fly ash gravel mixture to the ground again, and reverse stirring is carried out at the same time until the mixture is all sent into the pile hole.
6.Pile maintenance: After the pile is completed, the pile head should be covered and protected immediately to prevent pollution.
Third, the key points of quality control.
1.Strictly control the ratio of the mixture to ensure the uniformity and workability of the mixture.
2.After the pile is formed, the pile formation inspection should be carried out, including the inspection of the pile position, the number of piles, the length of the pile, the diameter of the pile, etc., as well as the inspection of the strength and integrity of the pile. The next process can be carried out only after passing the test.
4. Safety precautions.
1.Machinery and equipment should be inspected and maintained before construction to ensure the normal operation of machinery and equipment.
2.Obvious safety signs should be set up at the construction site, and the site should be kept clean and orderly.
3.Operators should wear safety helmets and safety belts, and safety nets should be used for protection when working at height.
4.The construction site should strictly prohibit fireworks, prohibit smoking, and be equipped with fire-fighting facilities.
In short, CFG pile is a very excellent foundation treatment technology, which has also been widely used in Yangxin area. Through reasonable construction preparation, correct construction technology and strict quality control, we can ensure the construction quality of CFG piles and provide a strong guarantee for the safety and quality of construction projects.