Pile foundation bearing platform settlement, reinforcement, lift-up and leveling structure, and construction method thereof

A pile foundation bearing platform settlement, reinforcement, lift-up and leveling structure, comprising:

• a bearing platform and a plurality of pile foundations fixedly connected to a lower portion of the bearing platform, and further comprising:
• a weak soil reinforcement layer under the bearing platform and a pile tip bearing stratum, wherein the bearing platform is located above the weak soil reinforcement layer under the bearing platform;
• the weak soil reinforcement layer under the bearing platform is formed with a plurality of first grouting holes, and each of the plurality of first grouting holes extends through the bearing platform and communicates with the outside;
• each of the plurality of first grouting holes is used to perform primary grouting in the weak soil reinforcement layer under the bearing platform so as to reinforce the weak soil reinforcement layer under the bearing platform, and an upward counter force is formed under a grouting pressure to slowly lift up the bearing platform to a designed allowable deviation range;
• the pile tip bearing stratum is located below the weak soil reinforcement layer under the bearing platform;
• the pile tip bearing stratum is formed with a plurality of second grouting holes, and each of the plurality of second grouting holes extends through the weak soil reinforcement layer under the bearing platform and the bearing platform, and communicates with an outside;
• each of the plurality of second grouting holes is used to perform secondary grouting in the pile tip bearing stratum, so as to form a composite foundation for lifting the pile foundation.