drill hole Cast-in-place pile Post grouting construction process
Bored cast-in-place pile is a widely used foundation structure at present, and cast-in-place pile foundation has increasingly become a common form of deep foundation for industrial buildings, high-rise buildings, bridges, docks, heavy storage silos and other projects on soft soil foundation. With the rapid development of modern construction technology, the requirements for the bearing capacity and deformation resistance of pile foundation are becoming higher and higher. The traditional bored cast-in-place pile is difficult to completely solve the problem of mud skin and sediment around the pile, and its advantages cannot be fully developed. The "post grouting technology" of bored pile can save the cost of pile foundation to a greater extent, shorten the construction period, effectively enhance the quality stability and improve the bearing capacity of single pile. Since the post grouting of bored piles can greatly improve the bearing capacity of single piles, the investment can be saved by reducing the pile layout and the pile length or diameter in design. According to the actual situation of the project, under the condition of not increasing the pile length and pile diameter, the post grouting is not only technically reliable, but also has far-reaching significance in improving the bearing capacity of a single pile, reducing project settlement, reducing the cost of pile foundation engineering, etc. Combined with the construction of post grouting bored piles for the taxiway bridge project in the north area of Beijing Airport Reconstruction and Extension Project, this paper focuses on the mechanism, construction technology and process technology quality control of post grouting bored piles, hoping to provide reference for everyone