The structure of the threaded water-stop screw is to weld a water-stop piece in the middle of a screw, and weld one piece at each end for waterproofing. The positioning piece is used to fix the formwork. The distance between the two positioning pieces represents the wall thickness.

There are many kinds of three-stage water-stop screw, the common ones are three-stage sleeve water-stop screw, three-stage vertebral body water-stop screw, hollow sleeve water-stop screw, also known as tubular three-stage water-stop screw. The three-section water-stop screw is composed of an inner rod, two outer rods and connecting nuts. After pouring concrete, the outer rods and connecting nuts can be removed for reuse in the next construction.

In terms of function comparison, after the concrete pouring is completed, the water-stop screw that is exposed outside the wall needs to be cut off, which will cause great damage to the formwork, and it is very troublesome to disassemble. The effect of the rear wall is not good, but the through-wire The installation speed of the water stop screw is fast, the operation is simple, and the price is relatively low.
Water-stop screw, also known as waterproof screw, water-stop bolt, anti-pull water-stop screw, wall-through water-stop screw, etc., is also widely known as shear wall through-wall water-stop bolt, Waterproof bolts for basement exterior walls, coarse thread waterproof screw rods, etc. Although there are many names, they all refer to the water-stop screw.