Container House Beam Installation Requirements
The beam installation of container houses must meet core requirements regarding structural load-bearing, material specifications, connection techniques, and safety standards, as detailed below:
1. Structural Load-Bearing and Construction Requirements
Container houses utilize a pure steel frame load-bearing system, with non-structural components such as wall panels, roof panels, and glass not bearing any load. The load transfer path is "panel secondary beams → main beams → corner columns → corner fittings → foundation/lower container". Corner fittings are the sole load-transfer points for stacking, and spot welding is strictly prohibited as a substitute. Main beams and columns must use weather-resistant steel for welding (GB/T 4171), while non-container components can use Q235B or Q345B steel (GB/T 700, GB/T 1591). If large openings are required, reducing structural stiffness, perforated and non-perforated containers should be arranged in a staggered, symmetrical pattern. The length of cantilevered sections must be strictly controlled, and no openings are allowed. For multi-story stacking, corner fittings and corner columns must be vertically aligned and securely locked to ensure planar symmetry of lateral force-resisting components and uniform vertical stiffness.
2. Material and Welding Process Requirements
The thickness of steel used for main beams and columns directly affects load-bearing capacity and must comply with national standards for welding container frame structural steel. Welding must be full and free of cold laps. All cutting and welding edges must be ground smooth and coated with epoxy primer + topcoat to prevent corrosion. The container body must undergo overall galvanization or anti-corrosion spray treatment, with recoating intervals of 8-12 years in inland dry areas, 7-10 years in southern humid regions, and only 3-5 years in coastal areas.
3. Connection Node and Load Transfer Design
Connections between beams, corner columns, and corner fittings must be secured with high-strength bolts or welding to ensure unobstructed load transfer paths during stacking. For modular combinations, corner fittings of upper and lower containers must be aligned and fastened with locks to avoid local stress concentration. When designing openings or staggered floors, additional secondary beams or diagonal braces must be added to compensate for stiffness loss.
4. Safety Compliance and Inspection Requirements
Container house designs must comply with the "General Technical Conditions for Prefabricated Integrated Houses" (JG/T550—2025), with a maximum of 6 stories, height ≤24m, and seismic fortification intensity ≤8 degrees. Containers entering the site must be inspection-certified per GB/T12418, with intact beams, columns, and all 8 corner fittings reliable, accompanied by quality certification documents. For fire safety, EPS and other flammable core materials are prohibited for enclosure filling. Crowded venues must use Class A rock wool or glass wool with a fire resistance rating ≥0.5 hours (stricter requirements for high-rise modules).
