The renovation and renovation of steel structures is not only a necessary measure to extend the service life of the building, but also a basic requirement for ensuring the safety of use. Through scientific and reasonable maintenance and transformation, the cost of later maintenance can be effectively reduced and resource conservation and utilization innovation can be achieved.
Low-cost strategy for steel structure renovation
1. Steel structure surface treatment and anti-corrosion coating
Anti-corrosion is a key link in steel structure renovation. After removing the old rust layer, use appropriate anticorrosion coatings to effectively delay the re-corrosion of the steel. Commonly used surface treatment methods include sandblasting and grinding. Sandblasting can facilitate the removal of rust spots, restore the surface roughness of the steel, and improve the adhesion of the coating.
In terms of coating selection, the combination of epoxy zinc-rich primer and polyurethane topcoat is relatively common, with good corrosion resistance and weather resistance. For different environmental conditions, water-based anticorrosion coatings or high-solid sub-coatings can be selected, taking into account both environmental protection and performance. Reasonable coating process and layer control also help save materials and construction costs.
2. Structural reinforcement and repair
For steel structures with reduced bearing capacity due to aging or insufficient design, reinforcement measures can be taken. The reinforcement methods are divided into outsourcing steel reinforcement, steel plate pasting reinforcement, and additional support systems according to specific circumstances. Outsourcing steel reinforcement increases cross-section and stiffness by wrapping existing components, making it easy to construct and relatively low cost.
Steel plate adhesive reinforcement is to use high-strength adhesive to fix the steel plate to the stressed part, which is suitable for local reinforcement and reduce the disassembly and assembly workload. The addition of a support system is suitable for improving the stability of the overall structure. During the reinforcement process, the key stress-bearing parts need to be inspected in detail to ensure that the reinforcement plan is scientific and reasonable.
3. Maintenance and replacement of connectors
Looseness or damage at bolt connections is a common problem with steel structures. Regularly check the status of the connector and timely tighten or replace damaged bolts can avoid safety hazards caused by loose structures. Using anti-loose nuts or adding anti-loose device can improve the stability of the connection.
If cracks or defects are found in the weld, weld repair or re-welding is required. The weld repair work should be completed by professional and technical personnel to ensure that the quality of the weld meets the design requirements.
4. Lightweight transformation and function improvement
On the premise of ensuring structural safety and combining actual use requirements, lightweight design and transformation of steel structures is also one of the ways to save costs. By optimizing the cross-section of components and using high-strength steel, the use of materials is reduced and the weight of the structure is reduced, thereby saving investment in foundations and supporting facilities.
In addition, during the renovation process, functional measures such as fireproof coatings and heat insulation can be added to improve the comfort and safety performance of the building and meet the needs of modern use.
