Overview
Through-wall bolts are indispensable in modern concrete construction, providing a reliable method to anchor formwork panels. They consist of a threaded rod, nuts, and washers, designed to withstand the lateral pressure exerted by wet concrete. Their reusable nature and adaptability to varying formwork thicknesses make them a staple in projects ranging from high-rises to infrastructure. These bolts are engineered for ease of installation and removal, often featuring standardized threads (e.g., M12–M20) to accommodate different load requirements. Innovations like sacrificial sleeves or plastic cones allow for easy extraction post-curing, minimizing concrete surface damage.
Structure and Working Principle
A typical through-wall bolt assembly includes a central rod threaded at both ends, paired with nuts and washers at each side of the formwork. The bolt passes through pre-drilled holes in the formwork panels, and tension is applied by tightening the nuts, creating a clamping force that stabilizes the structure. The working principle relies on distributing concrete’s hydrostatic pressure evenly across the formwork. High-strength steel ensures minimal elongation under load, maintaining dimensional accuracy. Some designs incorporate PVC sleeves to protect the bolt from adhering to cured concrete, simplifying demolding.
Key Features
Durability is a hallmark of quality through-wall bolts, achieved through materials like Q345 steel and anti-corrosion treatments (e.g., hot-dip galvanizing). Their threaded design allows for precise tension adjustment, critical for preventing formwork blowouts during pouring. Modularity is another advantage, with bolts available in lengths from 300mm to 1500mm to suit varying wall thicknesses. Reusability reduces long-term costs, though bolts must be inspected for thread wear or bending after each use. Coatings like epoxy further enhance lifespan in humid or corrosive environments.
Application Areas
These bolts are widely used in cast-in-place concrete structures, including walls, columns, and beams. Major applications include high-rise buildings, bridges, and tunnels, where formwork stability is non-negotiable. In precast concrete manufacturing, specialized variants with quick-release mechanisms streamline production cycles. For curved or complex formwork, flexible bolt systems with articulated joints ensure uniform pressure distribution without compromising structural integrity.
Maintenance and Precautions
Regular inspection is crucial to identify wear, such as thread deformation or rust, which can compromise load-bearing capacity. After each use, clean bolts with wire brushes and apply light oil to prevent seizing. During installation, avoid overtightening nuts, which may strip threads or deform formwork panels. Always verify the bolt’s rated load capacity matches the project’s concrete pressure calculations. For safety, use double nuts or locking washers in high-vibration environments.
B2B Procurement Guide
When sourcing through-wall bolts, prioritize suppliers with ISO 9001 certification to guarantee material quality. Bulk orders (e.g., 1,000+ units) often attract discounts of 10–20%. Key specifications to confirm include tensile strength (≥400MPa for Q235 steel), thread pitch compatibility, and coating type. Logistics-wise, bolts are typically packaged in bundles of 50–100 units, with weight ranging from 15–30kg per bundle. Lead times vary from 7–21 days for custom lengths or coatings. For international procurement, verify compliance with regional standards like ASTM A307 or EN ISO 898-1.
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