Method for stabilizing and lifting channel boards by underwater grouting

A method for stabilizing and lifting a channel board by underwater grouting, wherein:

• the channel board is a damaged channel board, and a gravel layer is provided under the damaged channel board;
• the method comprises the steps of:
• (A) removing the damaged channel board, cleaning and leveling the gravel layer under the damaged channel board, placing an undamaged channel board installed with multiple first grouting pipes and at least one second grouting pipe on the gravel layer, wherein the multiple first grouting pipes are spacedly distributed at a periphery of the undamaged channel board;
• the at least one second grouting pipe is located at a middle portion of the undamaged channel board, multiple geotextile bags are bound to a lower portion of the multiple first grouting pipes, respectively;
• (B) performing a first polymer grouting through the multiple first grouting pipes, and then performing a second polymer grouting through the at least one second grouting pipe;
• (C) cutting off a part of the multiple first grouting pipes and the at least one second grouting pipe which are exposed to the undamaged channel board with a pipe cutter, and leveling incisions;
• and
• (D) removing excess polymer left on the undamaged channel board.