Waterstop steel sheet (waterstop steel plate) refers to a steel sheet embedded 300mm x 3m during the pouring of lower concrete layer, with 10-15cm exposed above. This portion of the steel sheet is poured into the concrete during the subsequent pour, serving to prevent external water pressure from seeping in. Consequently, the waterstop steel plate requires good welding joints without any leakage points to maintain its waterproofing performance.

1. Make every effort to position the water-stop steel plate on the centerline of the wall.

2. The welding between the two steel plates should be full and double-sided, with the overlap not less than 20mm.

3. Corner treatment of walls: 1. Bend a solid steel plate; 2. T-shaped welding; 3. 7-shaped welding.

4. Support welding for waterstop steel plates can be done by spot welding small rebars onto the main reinforcement.

5. When the waterstop steel plate passes through the column stirrups, the stirrups can be cut to form an open stirrup, which is then welded onto the steel plate.

6. The "opening" of the waterstop steel plate faces the upstream side.