Overview
Waterstop bolts are specialized construction fasteners designed to combine structural support with waterproofing. Unlike standard formwork bolts, they integrate a central sealing mechanism—typically a rubber or PVC disc—that compresses against the concrete during pouring. This creates a barrier against water penetration after the formwork is removed. Developed for critical infrastructure projects, these bolts are indispensable in below-grade construction where hydrostatic pressure is a concern. Their dual-threaded ends allow secure attachment to formwork panels while maintaining precise alignment for the waterproofing element.
Structure and Working Principle
A standard waterstop bolt consists of three key components: threaded steel rods at both ends, a central waterproofing disc, and sealing washers. The disc (usually 50–100mm diameter) is permanently fixed at the bolt's midpoint. During installation, compression nuts tighten the formwork panels against this disc, causing the washers to deform and form a gasket-like seal. The working principle relies on controlled compression. As concrete is poured, hydraulic pressure further forces the washers into microscopic gaps in the formwork. After curing, the outer rod sections are removed by unscrewing, leaving the central water barrier embedded in the concrete wall.
Key Features
Modern waterstop bolts offer several technical advantages. Corrosion-resistant variants use 304 stainless steel for coastal or wastewater applications, while hot-dip galvanized models suffice for general construction. Some high-end designs feature replaceable washers to extend service life. Reusable systems are gaining popularity, where the outer threaded sleeves detach post-pour, reducing material waste. Advanced versions include pressure-activated seals that expand upon contact with moisture, providing secondary protection if initial compression is imperfect.
Application Areas
Primary applications include water-retaining structures like swimming pools, sewage treatment plants, and dam walls. In civil engineering, they're mandatory for subway tunnels and underground parking garages where groundwater infiltration risks structural integrity. Beyond waterproofing, these bolts serve in temperature control. For mass concrete pours, they help manage thermal cracking by allowing controlled formwork movement during the curing process. Special anti-vibration models are used in earthquake-prone regions.
Maintenance and Precautions
Proper handling ensures optimal performance. Store bolts in dry conditions to prevent washer degradation, and inspect seals for cracks before use. During installation, use torque wrenches to achieve uniform compression—typically 20–30 N·m for standard rubber washers. Post-construction, exposed bolt ends should be treated with waterproof coatings. For reusable systems, clean threads thoroughly after each use and apply graphite lubricant to prevent galling. Never weld near installed bolts, as heat can compromise the seal.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with ISO 9001-certified manufacturing, particularly for critical projects. MOQs generally start at 5,000 units, with price breaks at 50,000-unit tiers. Lead times vary from 2 weeks (standard sizes) to 6 weeks (custom diameters). Key specifications to confirm: tensile strength (≥500 MPa for structural use), washer material (EPDM rubber for chemical resistance), and compliance with local standards like ASTM F1574. For international shipments, request passivation treatment to prevent saltwater corrosion during transit.
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