Abstract: Due to the quality issues of the pile foundation construction in a high-rise residential project, the axial bearing capacity of many piles are tested could not meet the design requirements, so the piled raft foundation needs to be reinforced. Considering the structural safety, the rationality of construction plan, construction feasibility, construction schedule and other aspects, this project is decided to adopt the reinforcement scheme of using Jacked Super-long Reinforced Concrete Pile. The concept innovatively adopts the mechanical connection pile joint. Throughout the low strain integrity detection and the load test verification, the results show that Jacked Super-long Reinforced Concrete Pile has a satisfactory effect of sharing the original foundation load. The axial capacity of the jacked pile and the settlement of the building tend to be stable. Further, the installation construction method is relatively simple, which can meet the needs of soft soil foundation reinforcement. The mechanical connection pile joint is safe and reliable, and the construction schedule can be greatly shortened; This conclusion can provide a reference for the design and construction of foundation reinforcement of similar projects.

Key words: Jacked Reinforced Concrete Pile, Mechanical Pile Joints, Pile Foundation Reinforcement, Load Test