Overview
The GB Rubber Waterstop is a critical waterproofing component in civil engineering, manufactured to meet China's national standard GB/T 18173.2. It functions as a flexible barrier embedded in concrete joints to prevent water infiltration while accommodating structural movements. The product is categorized into bridge-type (B), tabular-type (P), and others based on cross-sectional design, with sizes and performance metrics strictly regulated. Commonly produced via vulcanization molding, it serves as a cost-effective solution for infrastructure projects requiring durable sealing. Its adoption ensures compliance with Chinese construction codes and enhances the longevity of water-retaining structures.
Structure and Working Principle
A typical rubber waterstop features a central bulb or hollow section flanked by anchoring fins. The bulb compresses under joint movement, maintaining seal integrity through elastic recovery, while the fins embed securely in concrete to prevent displacement. Some designs incorporate steel plates for added tensile strength in large joints. The working principle relies on the material's ability to deform under stress without losing sealing properties. When installed centrally across a joint, it forms a continuous barrier that blocks water migration even during thermal expansion or seismic shifts, crucial for structures like subway tunnels.
Key Features
GB-compliant waterstops exhibit tensile strengths exceeding 12 MPa and elongation rates over 380%, ensuring durability under dynamic loads. Premium grades use ozone-resistant EPDM or chloroprene rubber for harsh environments, with hardness typically ranging from 60–65 Shore A for optimal flexibility. Additional features include resistance to alkalis, salts, and mild acids, verified through immersion testing per GB standards. UV-stabilized formulations are available for exposed applications, while some variants include conductive elements for joint monitoring in specialized projects.
Application Areas
Primary applications include underground engineering (metro systems, parking garages), hydraulic structures (dams, sewage treatment plants), and transportation infrastructure (bridge deck joints, culverts). In precast concrete construction, it is pre-installed in segments to ensure watertight assembly on-site. Specialized variants serve nuclear power plants (radiation-resistant formulations) and marine projects (saltwater-adapted compounds). The product is indispensable where structural joints intersect with waterproofing membranes, acting as a fail-safe secondary seal.
Maintenance and Precautions
Pre-installation checks should verify no physical damage or deformation exists. During concrete pouring, vibration equipment must avoid direct contact with the waterstop to prevent dislocation. Post-installation, exposed sections should be protected from mechanical impacts until backfilling or cladding installation. For maintenance, periodic inspections of joint seals are recommended, especially after seismic events. Minor surface damage can be repaired with compatible rubber adhesives, while compromised sections require professional splicing using vulcanization kits.
B2B Procurement Guide
Procurement should specify GB/T 18173.2 compliance with required type (B, P, etc.), dimensions (e.g., 300×8 mm), and material grade. Bulk orders typically require factory testing reports for tensile strength, elongation, and compression set. MOQs for manufacturers commonly start at 500 meters, with lead times of 2–4 weeks for custom profiles. Top production hubs are in Hebei and Shandong provinces, where buyers can audit facilities for vulcanization press capabilities and raw material quality controls. Logistics considerations include coiled packaging (usually 50m/roll) to minimize shipping damage.
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