Prefabrication Plan for Steel Structure Houses

The prefabrication plan for steel structure houses encompasses four core stages: design and disassembly, factory production, material provision, and on-site assembly, all of which must adhere to technical requirements for corrosion resistance, thermal insulation, foundation treatment, and wind and earthquake resistance.

1. Design and Disassembly

Suppliers are required to complete structural design based on the size of the residential land, housing type requirements, and climatic conditions, and then disassemble the house model into standardized modular components, such as wall frames, floor beams, roof trusses, and stairs. Each component must be assigned a unique identification number and detailed assembly drawings to ensure precise alignment during subsequent production and installation. This stage involves structural calculations in accordance with the "Steel Structure Design Standard" (GB50017) to ensure reasonable load transfer and stability.

2. Factory Prefabrication

Components are fabricated using cold-formed thin-walled steel sections (such as C-sections and U-sections) or high-frequency welded H-sections, with processes including cutting, punching, and welding completed on fully automated production lines, achieving dimensional accuracy within millimeters. During production, special attention is given to corrosion and rust prevention:

• Material Selection: Primary components are selected from aluminized zinc plates or hot-dip galvanized plates, with coating thickness meeting the requirements of the "Technical Requirements and Test Methods for Hot-Dip Galvanized Coatings on Iron and Steel Products" (GB/T 13912);
• Edge Treatment: Exposed edges after cutting and drilling are coated with specialized anti-rust sealing paint to prevent localized corrosion;
• Rust Prevention Process: Techniques such as galvanizing and aluminized zinc coating are employed to ensure the durability of components in humid environments.

3. Material Provision and Logistics

The plan includes the provision of auxiliary materials such as connectors (bolts, self-tapping screws), roof panels, wall panels, thermal insulation materials (rock wool, glass wool), and moisture-proof membranes. Logistics planning determines the type and quantity of transport vehicles based on the number and volume of components; for example, a 200-square-meter building requires 2-3 13-meter flatbed trucks. Components must be secured during transport to prevent deformation or damage.

4. On-Site Assembly and Technical Support

Upon arrival at the site, construction personnel assemble components according to drawings and identification numbers using bolts or self-tapping screws, without the need for secondary cutting, welding, or drilling. Suppliers offer two service models:

• Material Supply + Technical Guidance: Suitable for farmers who undertake construction themselves, providing technical disclosure documents, assembly diagrams, and on-site guidance for key nodes;
• Full-Process Subcontracting: Suitable for construction teams that handle both labor and materials, covering comprehensive technical support from foundation construction to interior and exterior wall decoration.

5. Key Technical Requirements

• Thermal Bridge Prevention and Insulation: Continuous installation of vapor barriers and thermal insulation materials within walls ensures a seamless insulation layer, preventing thermal bridge effects;
• Foundation Treatment: Strip foundations or independent foundations are used, with embedded anchor bolts and elevation errors controlled within ±5mm;
• Wind and Earthquake Resistance: Overall stability is enhanced through structural design and connection node optimization (such as adding diagonal braces and using high-strength bolts), meeting the requirements of the "Code for Seismic Design of Buildings" (GB50011).

The plan must be formulated with technical and management measures in accordance with the "Code for Acceptance of Construction Quality of Steel Structures" (GB50205) to ensure compliance with standards in detailed design, component processing, on-site lifting, and connection nodes.