A perfect design drawing will become meaningless if the fabrication process at the factory and erection at the site do not comply with technical requirements. How to ensure components are manufactured to the correct dimensions? Are the welds strong enough? Is the protective paint layer thick enough?
All these questions are answered by the standard for construction and acceptance of steel structures. This article will focus on TCVN 170:2022, the latest technical standard, and other important regulations in this process.
1. TCVN 170:2022 – Core Standard for Execution
TCVN 170:2022 (the set of standards replacing TCXDVN 170:2007) is the national standard for “Execution of steel structures and aluminum structures”. Specifically, TCVN 170-2:2022 is the most important part, specifying “Technical requirements for steel structures”.
- Scope of application: This standard provides technical requirements for the construction and fabrication of components from hot-rolled structural steel (strength up to S700), cold-formed steel, and welding of reinforcing steel to steel structures.
- General technical requirements: The standard clearly specifies requirements for:
- Materials: All steel and welding materials must be inspected, classified, marked, straightened, and cleaned of rust and grease before fabrication.
- Fabrication: Must comply with detailed drawings, prioritizing the use of mechanized methods.
- Assembly and connection: Regulations on tolerances, welding techniques, and bolt assembly.
2. TCVN 8790:2011 – Vital Standard for Protective Coatings
A crucial part of construction and acceptance is protecting the steel structure from corrosion. TCVN 8790:2011, titled “Protective coatings for steel structures – Application and acceptance procedure,” is the mandatory standard for this category.
This standard specifies 3 stages in detail:
a. Surface Preparation
This is a key factor. The standard requires the surface to be cleaned of rust, grease, and soluble salts (if any). The cleaning level must meet the requirements (e.g., grade 2 according to TCXDVN 334:2005).
b. Application
Clearly defines application conditions to ensure the quality of the paint film:
- Weather: Do not paint when it is about to rain, humidity is above 85%, or during strong winds.
- Method: Spraying, rolling, or brushing can be used.
c. Inspection & Acceptance
A component is considered to meet the protective coating requirements when it passes the following tests:
- Appearance: The paint film must be uniform, without peeling or wrinkling.
- Dry Film Thickness (DFT): Use specialized gauges to check and ensure the thickness matches the design.
- Adhesion: Tested using the cross-cut method to ensure the paint adheres firmly to the steel surface.
3. Other Supporting Standards
Like the design standard, TCVN 170 also references a system of auxiliary standards for materials and connections, including:
- TCVN 1916:1995: Technical requirements for bolts and nuts.
- TCVN 3223:1994: Welding electrodes.
- TCVN 8789:2011: Standard for technical requirements of coating materials.
- TCVN 10307:2014: Although specialized for “Steel Bridge Structures,” this standard also provides very detailed general technical requirements for fabrication, assembly, and acceptance, often used as a reference for heavy industrial steel structures.
Conclusion: “Acceptance” is not a task performed at the end of a project, but a continuous quality control (QC) process at every stage. Strict adherence to TCVN 170:2022 and TCVN 8790:2011 from the factory to the construction site is Hai Long Construction's commitment to ensuring the finished project has the highest quality, durability, and safety, exactly as per the approved design drawings.
WHY CHOOSE HAI LONG CONSTRUCTION AS YOUR STEEL STRUCTURE MANUFACTURING & ERECTION PARTNER
With over 26 years of experience in the field of steel structure manufacturing & erection, Hai Long Steel Structure is proud to be a leading reputable unit, providing customers with comprehensive construction solutions that meet all needs and requirements.
- A team of experienced engineers, architects, and experts, knowledgeable in the design and construction of factory buildings and warehouses according to international standards.
- Diverse construction capabilities, meeting all project scales and requirements, from simple to complex factory buildings.
- Owning a system of modern machinery and equipment, with a capacity of nearly 50,000 tons/year, ensuring fast, accurate, and safe construction.
- Professional construction process, strictly managed.
Are you looking for a reputable and professional steel structure manufacturing and erection contractor? Contact Hai Long Construction for free consultation and quotation:
- HAI LONG CONSTRUCTION JSC – MEMBER OF TAIYO GROUP
- Address: Taiyo Building, 97 Bach Dang, Hong Bang Ward, Hai Phong City, Vietnam.
- Hotline: 084 6625 888
- Email: info@hailongjsc.vn
