Can Wall-Penetrating Bolt be reused?

Can Wall-Penetrating Bolt be reused? 

Whether Wall-Penetrating Bolt can be reused depends on their material, structure type, integrity after use and subsequent application scenarios. 

1. Reusable situation Structural design supports recycling: three-stage Wall-Penetrating Bolt (composed of inner rods, outer rods, and connecting sleeves) are typical reusable types. When pouring concrete, the inner rod and the connecting sleeve can be completely disassembled after removing the mold, and can be used again for wall construction of the same specification after cleaning and maintenance, especially suitable for batch projects, which can reduce costs. Material and condition up to standard: ordinary Q235 steel, Q355 steel or stainless steel screw, if there is no obvious deformation (such as bending, thread damage), rust (only surface rust can be cleaned) after use, and the mechanical properties are not reduced due to vibration and load, after cleaning the surface cement residue and repainting the anti-rust paint, it can be used in secondary scenarios without waterproof requirements (such as temporary fences, indoor non-load-bearing wall formwork).

2. Reuse is not recommended Water-stop type or permanent buried screw: a wall-piercing screw with a waterstop plate and a water-stop ring (often used in basement exterior walls and pools), after pouring, it needs to be permanently combined with concrete to ensure waterproofness. There are potential quality hazards after use: if the screw has obvious bending, thread slippage, local cracking, or the rust depth exceeds 0.5mm (affecting the stress strength), it is difficult to restore the original mechanical properties even if repaired. Special scenario restrictions: Screws used in highly corrosive environments (such as chemical workshops), even if the material is stainless steel, may be damaged after long-term use, and the surface plating or passivation layer may be damaged after long-term use. In summary, reusable screws need to be screened in three steps of "cleaning→inspection (appearance + mechanical properties) →protection treatment", and are preferentially used in scenarios with low load and waterproof requirements; permanently buried, damaged or corroded screws that exceed the standard are not recommended for reuse to ensure construction safety.