Method for reinforcing three-level old rubble retaining wall adjacent to deep foundation pit supporting structure

The invention discloses a method for reinforcing a three-stage old rubble retaining wall adjacent to a deep foundation pit supporting structure, and relates to the technical field of retaining wall reinforcing, and the method comprises the following steps: S1, constructing a plurality of miniature steel pipe piles on a platform surface close to a second-stage retaining wall, after steel pipes of the miniature steel pipe piles are inserted to a preset depth, adjusting a reinforcing tool, and reinforcing the second-stage retaining wall; the connecting strength between the miniature steel pipe pile and the earthwork is improved, and then grouting is conducted in the steel pipe; s2, constructing a capping beam to connect the miniature steel pipe piles into a whole; s3, the first-stage retaining wall is dismantled, and the original ground is backfilled to the elevation needed by pile machine operation; s4, after net hanging and concrete spraying are conducted on the outer side of the earthwork of the micro steel p