Container House Construction Materials
The main materials for constructing container houses include steel, enclosure panels, connectors, and anti-corrosion coatings, as detailed below:
1. Steel: The Core Material for the Main Frame
The main frame of a container house typically uses high-strength weathering steel, such as Q355B grade steel. Its yield strength is approximately 30% higher than that of ordinary carbon steel, enabling it to support a box structure with a length-to-width ratio close to 2:1. The steel forms a self-balancing system through rigid connections between corner fittings and side beams, while the top longitudinal corrugated panels disperse stress through their geometric shape, preventing local buckling and reducing material usage by about 15%. Some companies, addressing the needs of multi-story combinations, use 6mm thick square steel as columns and add stiffeners at connection nodes, increasing overall compressive strength by about 50%.
2. Enclosure Panels: Composite Structure Enhances Thermal Performance
The enclosure structure often employs a three-layer composite construction of 'rock wool-air layer-aluminum-zinc coated steel plate'. The rock wool layer, 75-100mm thick, has fibers arranged perpendicular to the heat flow path, with a thermal conductivity below 0.040 W/(m·K); the intermediate 5mm air layer suppresses convective heat transfer through a closed cavity, resulting in an overall heat transfer coefficient (U-value) below 0.5 W/(m²·K). This design reduces condensation risk in low-temperature environments, extending the service life of the steel structure. Some companies also use a high-weather-resistant polyester resin coating on the outer layer and add a moisture-proof aluminum foil layer on the inner layer to further reduce the probability of condensation.
3. Connectors: Key to Seismic Resistance and Disassembly
The box connections adopt a 'wedge lock + high-strength bolt' dual fixation mode. The wedge lock, made of 45# steel through heat treatment, has a 15-degree inclined surface angle, generating a self-locking effect under horizontal shear forces. In actual tests, this node maintains a displacement of less than 3mm in a shaking table test simulating a rare 8-degree earthquake, outperforming conventional welded nodes by about 40% in deformation amplitude. This disassemblable connection method facilitates repeated assembly during secondary relocation, reducing construction waste.
4. Anti-Corrosion Coatings: Guarantee for Extended Lifespan
The coating system uses a 'epoxy zinc-rich primer + polyurethane topcoat' combination. The primer contains over 80% zinc powder, protecting the base metal through the sacrificial anode principle; the topcoat, enhanced with nano-silica particles, has a hardness of 3H, resisting wind and sand erosion. In salt spray tests (ASTM B117 standard), this coating system withstands 1000 hours without red rust, equivalent to a 15-year protection cycle in coastal or industrially polluted environments, supporting a 25-year service life for the main box structure.
