Shenzhen zhongshenglong waterproof decoration Co., Ltd, Backfill grouting 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 will fill all the cracks in the concrete and completely block the water outside the concrete structure, so as to achieve the purpose of water stop and leakage stoppage. The technology of grouting and plugging is a new technology of high-pressure airless grouting with advanced level, which is a new technology of water-soluble grouting materials used in developed countries.