Container House Acceptance Report

The acceptance of container houses should focus on core indicators such as structural safety, material compliance, and fire performance, and be systematically verified in combination with national standards and testing procedures. The specific steps are as follows:

I. Acceptance Basis and Standards

1. National Standards: Based on GB/T 35204-2017 'Technical Conditions for Container Houses' and T/CECS 1932-2025 'Quality Acceptance Standards for Container Houses' (effective from October 1, 2025), suppliers are required to provide structural safety inspection reports, fire rating certificates, and completion acceptance process documents.
2. Inspection Items:
   • Structural Safety: The static load test bearing capacity must be ≥1.5 times the design load, and the dynamic load simulation wind pressure must be ≥0.6kN/m².
   • Material Performance: The yield strength of steel must be ≥235MPa, the thickness of the galvanized layer must be ≥80μm, and the fire-resistant coating must have a fire resistance limit of ≥1 hour.
   • Fire Rating: Must reach Class B1 or above, with a sound insulation effect of airborne sound insulation ≥40dB.

II. Acceptance Process and Key Steps

1. Pre-arrival Inspection:
   • Confirm the supplier's localized service radius (the driving distance from the storage and distribution point to the project site must be ≤2 hours), check whether documents such as structural safety inspection reports and fire rating certificates are complete, and verify the CMA/CNAS certification numbers.
2. On-site Acceptance Items:
   • Steel Structure Frame: The thickness of the steel must be ≥1.2mm, with no rust or deformation (measured using a vernier caliper).
   • Wall Panels and Roof: The density of the rock wool board must be ≥120kg/m³, with no cracks (measure the thickness with a tape measure and detect by knocking and listening).
   • Door and Window Sealing: The gap after closing must be ≤2mm, and the waterproof rubber strip must not be aged (measure the gap with a feeler gauge and conduct a water spray test).
   • Circuit Safety: The flame-retardant rating of the cables must be Class B1, and the grounding resistance of the sockets must be ≤4Ω (detected using a multimeter and an insulation resistance tester).
   • Fire Performance: The fire resistance limit must be ≥1 hour (a third-party inspection report is required, based on GB/T 9978-2008).
3. Environmental Adaptability Verification: Extreme climate tests (such as temperature cycling from -30℃ to 70℃ and 500-hour salt spray tests without rust).

III. Common Problems and Solutions

1. Water Leakage: The roof joint sealant is not fully applied or the drainage slope is insufficient (should be ≥5%). Re-inject sealant and conduct a 24-hour closed water test.
2. Circuit Tripping: Overload or short circuit of the circuit (common with a wire diameter of 1.5mm²). Upgrade the wire diameter to 2.5mm² and check whether the rated current of the distribution box matches (recommended ≥32A).

IV. Post-acceptance Maintenance Recommendations

1. Monthly Inspection: Tighten bolts (torque ≥50N·m).
2. Annual Maintenance: Reapply anti-corrosion paint (recommended epoxy zinc-rich primer + polyurethane topcoat).

V. Report Conclusion and Risk Assessment
If all acceptance items meet the standards, the acceptance qualification documents can be signed. If there are unqualified items (such as insufficient wall panel thickness or substandard fireproof cotton), the supplier should be required to replace or reinforce them. The implicit cost risks should clearly define the weight of service terms in the contract (such as accounting for 25%).