Grouting and plugging, Grouting leakage repair is to inject water-soluble polyurethane chemical grouting material into concrete cracks by mechanical high-pressure power. When the slurry meets the water in the concrete cracks, it will quickly disperse, emulsify, expand and consolidate. In this way, the consolidated elastomer fills all the cracks in the concrete and completely blocks the water outside the concrete structure, so as to achieve the purpose of water stop and leakage stoppage. Waterproof grouting technology is an advanced high-pressure airless grouting waterproof technology, which is a new technology of water-soluble grouting materials used in developed countries.