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There are two methods for sealing with back water pressure: grouting method and joint filling method. First, dig a week at the junction of the tunnel and cement, chisel the cement into a 3.5 * 4.5 U-shaped joint and every leak at the flat leakage point into a U-shape. After cleaning the surface of the leakage layer and rinsing it clean, use quick setting waterproof material for pipe embedding, pumping, water diversion and flow reduction operations. Do not fill the groove at once to leave room for joint filling. Set a bamboo joint (grouting nozzle) at regular intervals. After the quick setting material reaches a certain strength, it may be injected with elastic sealing slurry through the bamboo joint back pressure until the deformation joint no longer flows water. When encountering water, it will expand and set quickly. Then, fill and compact the surface layer with pouring material on the concave handle of the deformation joint of the waterproof. Adopting a long-term waterproofing and plugging process that combines material waterproofing and structural waterproofing, i.e., a combination of rigidity and flexibility.

1. Chisel the joints according to the quantity specified by Party A's requirements.

2. Clean the leaking area and chisel out the leaking joint into a U-shaped seam.

3. Pre embedded bamboo joints for milling water leakage joints, cleaning of water leakage joints, filling and plugging of water leakage joints, installation of suction pipes and bamboo joints (grouting nozzles).

4. Guide, reduce pressure, and decrease water flow to control the leakage point. Change the large water flow to a small water flow so that the small water flow flows out from the installed guide pipe.

5. Ingredients: Mix several reagents into two groups of mixed slurry, and determine the solidification time of the ingredients based on the amount of water leakage.

6. Reverse pressure grouting: The grouting pressure must be greater than the leakage pressure in order to push the water flow back and penetrate into the fine cracks of the leaking rock. When encountering water, it expands rapidly and sets quickly, achieving the effect of long-term deep waterproofing.

7. Dig out bamboo joints (or not) and fill them with blocking material directly.

8. After self inspection, if there is no leakage in the surface treatment, the surface coating should be scraped flat.