Pre-bent rubber waterstop, a product mainly used for internal concrete deformation and expansion joints, featuring the ability to adapt to concrete expansion and deformation with the elasticity of rubber material and its structural form. This product utilizes the high elasticity and compressive deformation of rubber to produce elastic deformation under various loads, effectively securing and sealing to prevent leakage and seepage in building components, and providing shock absorption and buffering, ensuring the service life of the construction building.

Application and Temperature Range:

Standard Type: -25℃ to +60℃

Cold-resistant: -40℃ to +60℃

There are two methods for connecting jointed rubber waterstops embedded in the middle: one is a cold joint using an adhesive, and the other is a hot joint using a hot vulcanization mold.

Below, we introduce two methods of joints: Cold jointing with adhesive uses rubber waterproofing strips and cold jointing adhesive. The strip to be joined is flattened by a grinder for 5~10 cm, then coated with adhesive and pressed firmly. It boasts high strength, quick curing, easy construction, time and labor-saving, and can meet general engineering quality requirements.

Field hot vulcanization joint is achieved by using a hot vulcanization mold matched with the water stop and rubber sheet, which is vulcanized on-site. It is challenging to install, yet the joint is ideal, suitable for projects with stringent quality requirements for engineering works.

The structural types can be divided into two: CB-type waterstop and CP-type waterstop.

The CB-type waterstop refers to an intermediate-pored embedded waterstop, which is divided into two types: CB-type rubber waterstop and CB-type plastic waterstop. It is mainly used for expansion joints, settlement joints, and seismic joints in various concrete structures, featuring tight anchoring with concrete, water-sealing, and the ability to adapt to the expansion and contraction of deformation joints.

The CP-type waterstop refers to an embedded waterstop without holes in the middle, which is available in two types: CP-type rubber waterstop and CP-type plastic waterstop. It is mainly used for construction joints, complete shrinkage joints, incomplete shrinkage joints, and expansion joints in concrete structures with small deformation. It features tight anchoring with concrete, water-sealing, and elastic tensile deformation.

Our specifications for the design and selection of this rubber waterstop: During the engineering design and construction selection process, the width and thickness of the CB-type embedded rubber waterstop should be determined according to the following conditions:

When the water pressure is less than 4m and the horizontal and vertical deformation does not exceed 10mm, the width of the CB-type embedded rubber waterstop should not be less than 200mm, and the thickness should not be less than 5mm.

2. When the water pressure is 4-8m and the horizontal and vertical deformation does not exceed 30mm, the width of the CB-type embedded rubber waterstop should not be less than 300mm, and the thickness should not be less than 6mm.

3. When the water pressure exceeds 8m and the horizontal and vertical deformation exceeds 30mm, the width of the CB-type embedded rubber waterstop should not be less than 350mm, and the thickness should not be less than 8mm.

4. Water pressure not exceeding 8m, horizontal deformation not more than 20mm. When there is no vertical deformation, the width of the embedded rubber waterstop in the CB type should not be less than 200mm, and the thickness should not be less than 5mm.

In addition, when the structural cross-sectional dimension exceeds 500mm, the width of the CB-type embedded rubber waterstop should not be less than 300mm. When the CB-type waterstop is bent, the turning radius must not be less than 300mm. The product standard for the embedded rubber waterstop, as per GB 18173.2-2000, utilizes the high elasticity and compressive deformation properties of rubber to produce elastic deformation under various loads. This economical embedded rubber waterstop effectively secures and seals, preventing leakage and seepage in building components, and also serves as a shock-absorbing buffer, ensuring the service life of the construction. This product is mainly used in the deformation joints that must be installed during the concrete pouring process, such as water channels, tunnel outlets, retaining dams, water conveyance aqueducts, and more.

The middle-buried rubber waterstop is partially or fully embedded in the concrete during the concrete pouring process. After the concrete pouring of the previous section is completed, the construction joint interface hardens and dries, the surface debris is cleared, and before embedding the concrete, it must be kept flat at the interface, with the joint parts securely bonded. The waterstop joints must be bonded well. If the construction site conditions are met, thermal vulcanization bonding methods can be used. Unprocessed so-called "lap joints" are not permitted. Then, pour and vibrate the concrete with adequate force to position the waterstop, ensuring a good bond with the concrete to avoid affecting the waterstop's performance.

During construction, due to the presence of many sharp-edged stones and pointed rebar in the concrete, attention should be given to the impact force during pouring and positioning the waterstop to prevent piercing the rubber waterstop due to excessive force. If any cracking is found, it should be repaired promptly; otherwise, the rubber waterstop's ability to resist external forces will significantly decrease when the joint deforms and is subjected to water pressure.

When positioning rubber waterstops, the product must be securely installed to prevent movement during concrete pouring and ensure the correct placement of the waterstop within the concrete. It must remain flat at the interface and should not roll or tangle. If tangles are observed, adjustments should be made promptly. Common methods for securing waterstops include: using additional rebar; using clamps; securing with wire and formwork, etc. When piercing, the hole must only be made in the edge installation area of the waterstop, ensuring no damage to other parts.