Foundation pit supporting structure for pipeline in-situ protection and construction method thereof

The invention discloses a foundation pit supporting structure for pipeline in-situ protection and a construction method of the foundation pit supporting structure. The foundation pit supporting structure for pipeline in-situ protection comprises four pipeline supporting pieces arranged in two pairs, a retaining wall and a plurality of advanced grouting guide pipes. The two pairs of pipeline supporting pieces are vertically buried in soil bodies on the two sides of the foundation pit in the first direction respectively, the two pipeline supporting pieces in pairs are located on the two sides of a pipeline respectively, a retaining wall is arranged between the two pipeline supporting pieces in pairs, the top of the retaining wall makes contact with the bottom of the pipeline, and the two sides of the retaining wall are each connected with one pipeline supporting piece; the multiple advanced grouting guide pipes are embedded in the retaining walls at intervals, the first ends of the advanced grouting guide pipes