I. Construction Process:

Leakproofing construction joints and settlement cracks: Backwater reverse pressure leakproofing method: Leakproofing joint filling and grouting methods, with the two methods being used together in construction. First, remove loose debris from the original leaking joint, clean and flush it thoroughly, and then use rapid-setting waterstop materials for pipe extraction, pipe burial, and water diversion and flow reduction operations. Do not fill the grooves all at once to allow room for the joint, and embed a bamboo section (grout nozzle) at regular intervals. After the quick-setting material reaches a certain strength, you can reverse-pressure inject the elastic leak-sealing grout through the bamboo section. Continue to fill until the deformation joint stops leaking. Upon contact with water, it will expand and set quickly. Then, use castable material to fill and compact the surface layer above the waterstop deformation joint. Combine material waterproofing with structural waterproofing, i.e., a long-lasting waterproofing and leak-sealing process that combines steel with flexibility.

 （1Inspect leakage cracks. First, identify obvious leakage cracks as per the project quantity required by Party A.

Clearing

（2Clean the leaking section, chisel out the leaky seam.3.5×4.5No Chinese content provided.UType seam.

（3Milling leaky seam openings, pre-burying bamboo joints, cleaning leaky seam openings, filling with sealing material, installing drainage pipes and bamboo joints (grout nozzles)

（4Divert flow, reduce pressure, decrease water flow volume, control leakage points, change from large to small water flow, allowing the small water flow to exit through the installed diversion pipes.

（5Ingredients: Mix several reagents into two batches of paste solution. Determine the curing time of the ingredients based on the amount of leakage.

（6Anti-pressure grouting: The pressure of the grout must be greater than the pressure of the leakage to push the water back and infiltrate into the concrete capillary cracks of the leakage, where it expands and sets rapidly upon contact with water, achieving the effect of deep-seated water stopping.

（7Excavate bamboo joints (optional) and fill with stopper material directly.

（8Surface treatment: After self-inspection with no leakage observed, the surface is smoothed with a paste.