Application of Repeated Grouting Steel Pipe Pile in Foundation Reinforcement of Existing Building

In this paper, through the field test of steel pipe pile in a foundation reinforcement project , a miniaturized construction equipment that can construct ultra deep steel pipe pile in deep sand layer is verified. This construction method has the characteristics of large bearing capacity and adaptability to low headroom construction. At the same time, by comparing the bearing capacity of single pile with two different construction processes, the advantages of repeated grouting steel pipe pile over slurry wall bored steel pipe pile are verified, and the estimation method of bearing capacity of repeated grouting steel pipe pile is given. Through the construction and monitoring of later actual projects, the reliability of repeated grouting construction technology is proved, which provides a reliable construction scheme for the construction of similar projects in the future.