Construction Technology of Deep Foundation Pit around Existing Subway Project

The project of Cowin City Plaza is adjacent to the existing Metro Line 2, and the basement floor is connected to the existing Metro Line 2 station hall floor, and the supporting structures on both sides of the connection port need to be connected with the original subway support structure; However, in the early stage of design, due to the lack of completion drawing data of the subway structure, some parts may be inaccurate, which increases the construction difficulty of the handover location, in order to ensure the protection of the subway structure during construction. To prevent disturbance of the existing subway structure due to the construction of the deep foundation pit, the project studies the foundation pit support construction at the subway junction location, conducts field surveys, communicates with the design in advance, optimizes the support structure at the connection port, and adjusts the original pile to high-pressure rotary blast pile to avoid greater disturbance to the existing subway structure during large-scale mechanical construction.