Ground Material Container House
Ground materials have a significant impact on the performance and user experience of container houses. Common materials include steel, rock wool, galvanized aluminum-zinc plate, PVC-coated steel plate, etc. Different materials have distinct characteristics in terms of structural stability, thermal performance, and durability.
Steel: The Core of Structural Stability
The main frame of container houses typically uses high-strength weather-resistant steel, such as Q355B grade steel. Its yield strength is approximately 30% higher than that of ordinary carbon steel, enabling a single container to form a self-balancing system through rigid connections between corner fittings and side beams when the length-to-width ratio is close to 2:1, reducing the need for additional reinforcement and lowering material usage by about 15%. For example, Baotou Xinxing Color Plate Steel Structure Manufacturing Co., Ltd. optimized steel selection and modular unit design, allowing containers to remain structurally stable even when stacked three layers high.
Rock Wool and Galvanized Aluminum-Zinc Plate: Key to Thermal Performance
The enclosure structure adopts a three-layer composite construction of 'rock wool-air layer-galvanized aluminum-zinc plate.' The rock wool layer, with a thickness of 75-100 millimeters and fibers arranged perpendicular to the heat flow path, has a thermal conductivity below 0.040 W/(m·K); the 5-millimeter air layer in the middle 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 and extends the service life of steel structures in cold winter environments in Inner Mongolia. For example, Hohhot Residential Container House Company reduced indoor temperature fluctuations by about 40% compared to traditional color steel plate houses by adding a rock wool main insulation layer and a PVC-coated steel plate inner layer.
PVC-Coated Steel Plate and Thermal Break Structure: Durability and Energy Efficiency Optimization
Some enterprises use PVC-coated steel plates as inner layer materials to reduce thermal radiation; they also fill hard polyurethane foam between the steel frame and inner wall panels and install rubber thermal insulation pads to form a thermal break inner lining structure. This design reduces heat exchange efficiency between the inside and outside of the container by about 40%, allowing indoor temperatures to be 8-10 degrees Celsius higher than the outside in winter without heating, reducing reliance on heating equipment energy consumption. For example, Baotou Camp Container House Company ensured comfortable living conditions in low-temperature environments for camp dormitory projects through thermal break structure treatment.
Anti-Corrosion Coating and Connection Nodes: Full Lifecycle Maintenance
The coating system uses a combination of 'epoxy zinc-rich primer + polyurethane topcoat.' The primer contains over 80% zinc powder, protecting the base metal through the sacrificial anode principle; the topcoat is added with nano-silica particles, achieving a hardness of 3H to resist wind and sand erosion. In salt spray tests (ASTM B117 standard), this coating system withstood 1000 hours without red rust, equivalent to a 15-year protection cycle in coastal or industrial pollution environments, supporting a 25-year service life for the main structure of the container. Connection nodes adopt a 'wedge lock + high-strength bolt' dual fixation mode, with a wedge lock slope angle of 15 degrees, producing a self-locking effect under horizontal shear forces, controlling displacement to within 3 millimeters during simulated rare earthquakes of magnitude 8, outperforming conventional welded nodes by about 40% in deformation amplitude, and facilitating secondary relocation and repeated assembly.
