Turnout foundation structure of straddle type monorail low line and construction method thereof

The invention provides a turnout foundation structure of a straddle type monorail low line and a construction method of the turnout foundation structure. The turnout foundation structure comprises a plurality of piers used for supporting a turnout beam, and the piers are arranged at intervals in the length direction of the turnout beam; each pier comprises a bearing assembly for bearing the turnout beam and a plurality of cast-in-situ bored piles for supporting the bearing assembly, the bottom ends of the cast-in-situ bored piles penetrate through the soft stratum and then extend into a supporting layer, and the top ends of the cast-in-situ bored piles are supported at the bottom end of the bearing assembly. The turnout foundation structure can be used for a site-limited section, the pierstructure is flexible in design, and each pier can be designed according to section characteristics and stress conditions of different positions; the bearing assembly of each pier and the multiple cast-in-situ bored piles are