There are many types and specifications of water stop bolts. Generally, harness cord water stop bolts are initially used. This kind of water stop bolts consist of a harness cord foot screws welding, two precise positioning pieces and a moisture-proof piece. The interval in the middle of the precise positioning is the thickness of the wall, which has the function of the formwork on both sides of the fulcrum; The moisture-proof piece is located in the middle of the two precise positioning pieces, which has the purpose of water stopping. With the development trend in China's construction industry, the application of new three-section water stop bolts is becoming more and more extensive. Among them, the most common ones are sleeve-type three-section water stop bolts and tapered-type three-section water stop bolts.