Which drawing set describes the construction joint installation of a steel plate waterstop for a water tank wall? (Waterstop Installation Method)

See page 749 of the 3rd edition of *Concrete Structure Construction Handbook*.

The steel waterstop is used because the horizontal and vertical components of a building's basement cannot be poured in one continuous pour. A horizontal construction joint is typically left 300mm from the foundation slab, and a steel waterstop is placed at this joint.

The steel waterstop is generally 400mm wide, with half embedded in the old and half in the new concrete.

The joint between the old and new concrete is called the construction joint. This is a weak point in the waterproofing of waterproof concrete. Adding a steel waterstop prevents water from seeping further into the joint when it encounters the waterstop, effectively cutting off the water's penetration path.

Even if water does seep through the gap between the steel waterstop and the concrete, the width of the steel waterstop extends the water's penetration path, thus also providing waterproofing.

Extended Information: Leakage Prevention Measures

1. Adopting a suitable joint type for the post-cast strip and its waterproofing method at the joint with the adjacent concrete is crucial for effective leakage prevention. Generally, tongue-and-groove joints or stepped joints should be used, combined with a waterstop strip or waterproof band in the middle of the joint.

2. If steel plate waterstops are used, the joints must be lap-welded with an overlap length of 250mm. Welding must be done in four directions, ensuring a full weld without slag inclusions, undercuts, or air bubbles.

3. Applying two coats of flexible elastic putty to the joints of the post-cast strips in interior walls and ceilings can prevent small cracks from forming during structural settlement and expansion.

4. When the post-cast strip requires pre-sealing, the concrete at the post-cast strip location should be locally thickened, and an externally applied or embedded waterstop strip should be added.

5. The post-cast strip should use compensating shrinkage micro-expansion concrete, and its strength grade should be one level higher.

Reference: Baidu Encyclopedia - Steel Plate Waterstop

Expansion Waterstop Construction Method (Expansion Waterstop Installation)

Hello, the construction specifications for expansion waterstops are as follows:

1. For BW putty-type waterstops with pre-reserved adhesive, a groove for the waterstop strip needs to be reserved in the first-poured concrete (this can be done by nailing wooden strips into the formwork).

2. After removing the formwork of the first-poured concrete, clean the surface to ensure the joint surface is free of water, clean, and debris. Water-expanding waterstop strip construction method and specifications.

3. Embed the BW putty-type waterstop into the reserved groove. If no groove is reserved, for vertical joints, adhesive can be used to adhere the entire length, or cement nails and wooden strips can be used to fix the waterstop strip; for horizontal joints, it can be directly adhered to the concrete surface.

4. Concrete should be poured as soon as possible after the BW putty-type waterstop is applied. Construction Methods and Specifications for Water-Swellable Waterstop Strips

5. During installation and pasting, prevent BW putty-type waterstop strips from becoming contaminated and expanding due to water exposure, so as not to affect the performance. Construction Methods and Specifications for Water-Swellable Waterstop Strips

Our company supplies rubber waterstops, water-swellable waterstop strips, two-component polysulfide sealant, polyethylene closed-cell foam board, polyurethane sealant, polyvinyl chloride putty, GB(SR) flexible filler, water-swellable tie bolt waterstop rings (gaskets), plastic blind drains, flexible permeable pipes, bridge bearings, and bridge expansion joints.

Hope this helps you, thank you.

How to install rubber waterstops in basements? Recommend good products? (Basement rubber waterstop installation method)

1. When installing rubber waterstops, pay attention to the following: Do not pour concrete directly onto the waterstop during fixing and pouring to prevent deformation and detachment. 2. Rubber waterstops and waterproof rubber sheets are made primarily from natural rubber and various synthetic rubbers, with added additives and fillers. They are produced through plasticizing, mixing, and molding, resulting in a variety of types and specifications, including bridge-type, mountain-type, P-type, U-type, Z-type, B-type, T-type, H-type, E-type, and Q-type. Based on application, they can be classified as embedded rubber waterstops and back-adhesive rubber waterstops. This waterstop material has good elasticity, wear resistance, aging resistance, and tear resistance. It has strong adaptability to deformation, good waterproof performance, and a temperature range of -45℃ to 60℃. Rubber waterstops should not be used when the temperature exceeds 70℃, or when subjected to strong oxidation or corrosion by organic solvents such as oils. They are commonly used in the construction of basement exterior walls and post-cast strips. 3. Application methods of rubber waterstops: Reliable fixing measures must be taken when tying reinforcing bars and supporting formwork. This prevents displacement of the rubber waterstop during concrete pouring, ensuring its correct position within the concrete. Perforations and holes may only be made at permitted locations on the waterstop. When fixing the waterstop, the effective waterproofing area of the waterstop must not be damaged. Common fixing methods include using additional reinforcing bars, special clamps, and fixing with wire and formwork. Regardless of the fixing method used, the waterstop must be fixed according to the construction specifications required by the design, ensuring accurate positioning of the waterstop, avoiding damage to the effective waterproofing area, and facilitating concrete pouring.