In order to solve the conflict problem between the construction location of the supporting structure of the new project and the abandoned supporting structure of the existing building (hereinafter referred to as the obstacle pile), the foundation engineering of a headquarters building in Shenzhen is taken as an example to study the uprooting construction of the obstacle pile, analyze the obstacle pile and the main structure of the existing building, the spatial relationship for supporting structure of the new project, the characteristics and difficulties of pile extracting under different working conditions, propose the construction technology of a full set of pipe rotary combination method pile extraction next to the existing building, focus on solving the construction difficulties of removing obstacle piles in various working conditions such as being close to existing buildings and having bulges, tilts, and piles with too large diameters, while reduce the impact of removing barrier piles on existing buildings and the surrounding environment. Through on-site practice verification, the process has a wide range of applications, high obstacle pile removal efficiency, safe and reliable equipment maturity, which can effectively reduce the difficulty of construction and protect existing buildings.