Removable Waterstop Bolt
Overview
The removable waterstop bolt is an engineered fastener system for concrete construction. It combines structural support during pouring with permanent waterproofing functionality. Unlike conventional bolts, this system features a three-part design: two reusable external threaded ends and a sacrificial center rod with an integrated waterstop. This allows the formwork to be dismantled cleanly while leaving a water-resistant seal in the cured concrete.
Structure and Working Principle
The bolt consists of three key components: two threaded end rods (typically reusable) and a breakaway center section with a welded waterstop disc. The waterstop is usually a round or square steel plate that becomes embedded in the concrete. During installation, the assembled bolt passes through formwork panels, with the waterstop positioned at the concrete's midpoint. After curing, the external rods are unscrewed, and the center section is snapped off below the surface, leaving the waterstop permanently sealed within the concrete matrix to block water migration paths.
Key Features
Modern removable waterstop bolts offer several advantages over traditional solutions. The breakaway design eliminates protruding bolt ends that require grinding, reducing labor costs and surface damage. The integrated waterstop creates a positive mechanical barrier against water penetration, outperforming surface-applied sealants. Most systems use standardized threading (typically M12-M20) for compatibility with existing formwork hardware. High-end versions feature corrosion-resistant coatings or stainless steel construction for harsh environments.
Application Areas
These bolts are essential for water-retaining structures including basement walls, water treatment plants, swimming pools, and underground parking garages. They're specified in projects where both watertightness and efficient formwork removal are critical. In tunnel construction, they prevent groundwater infiltration through segment joints. Some marine applications use specialized versions with enhanced corrosion protection. The construction industry increasingly adopts them as a sustainable alternative to conventional through-bolts that create maintenance issues.
Maintenance and Precautions
Proper installation requires torque-controlled tightening to prevent deformation of the waterstop plate. The reusable ends should be cleaned and lubricated after each use to maintain thread integrity. After concrete curing, the center rod must be cleanly broken below the surface - typically using a striking tool. Never attempt to remove the embedded waterstop. For critical applications, conduct water penetration testing on mock-up panels to verify installation techniques before full-scale use.
B2B Procurement Guide
When sourcing removable waterstop bolts, verify compliance with relevant standards like BS EN 13670 for concrete construction. Request certified material test reports for corrosion resistance claims. Consider total cost of ownership - while stainless steel versions cost 2-3× more than carbon steel, they may offer better lifecycle value in corrosive environments. For large projects, request samples to test breakaway performance. Leading manufacturers provide CAD drawings and installation guides to facilitate specification.
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