Method for constructing fixed monitoring pile for mining area with high phreatic water level

A method for constructing a fixed monitoring pile for a mining area with a high phreatic water level, comprising:

• S1:
• prefabricating a pile foundation body, wherein the pile foundation body has a columnar structure, and a plurality of extension connection ports are provided at an outer side and a bottom of the pile foundation body;
• and
• S2:
• digging a foundation pit at a designated monitoring point;
• combining the pile foundation body with an extension body to form a fixed monitoring pile;
• placing the fixed monitoring pile into the foundation pit, such that a bottom extension body and a side extension body are inserted into the pit foundation;
• and backfilling and compacting;
• wherein in step S1, the pile foundation body comprises the following components that are combined together through cement pouring:
• a plurality of steel reinforcement rings, a plurality of side connecting reinforcement bars, a central vertical reinforcement bar, and a plurality of spiral reinforcement tubes;
• the plurality of steel reinforcement rings are vertically spaced and connected by the plurality of side connecting reinforcement bars;
• the central vertical reinforcement bar is located at a center of the steel reinforcement ring;
• the plurality of spiral reinforcement tubes are distributed at the outer side of the pile foundation body;
• a bottom of the central vertical reinforcement bar is connected to a spiral reinforcement tube;
• and open ends of the spiral reinforcement tubes form the extension connection ports.