Second-Hand Container House Repair

Repairing second-hand container houses requires targeted measures based on the extent of damage, primarily divided into three categories: structural repair, component replacement, and surface treatment. Here are specific repair scenarios and methods:

1. Container Door System Repair
When the container door deforms, preventing it from closing tightly or losing its rainproof function, mechanical correction is needed to restore the flatness of the door frame and ensure sealing. If the door hinge device is deformed or damaged, it should be disassembled, corrected, or directly replaced with a new hinge to ensure smooth opening and closing. When the door lock system is damaged, the entire lock rod, lock rod seat, lock tongue, and other components should be replaced, with particular attention to the matching of the lock block and handle seat to avoid secondary damage caused by size discrepancies.

2. Panel Structure Repair
For local damage to the side panels, wall panels, door panels, roof panels, or floor panels, the repair method should be selected based on the degree of damage:

• Leveling Treatment: For slight depressions or wavy deformations, use hydraulic lifting equipment to gradually restore the original position, and use a level gauge to check the flatness.
• Welding Repair: For perforations or fractures, first remove the rust layer, and then use carbon dioxide gas shielded welding for overlay welding. The weld should be uniform, full, and free of pores.
• Patch Welding: If the panel corrosion depth exceeds 30% of the original thickness, the damaged area should be cut out, and a patch of the same material should be welded. The edges of the patch should be ground into a 45° bevel to enhance bonding strength.

3. Weld Maintenance
Regularly inspect the welds on various parts of the container body. If cracking is found, the original weld metal should be completely removed, and re-welding should be performed, followed by covering with anti-rust primer. Pay special attention to stress-concentrated areas such as the connections between corner posts and bottom crossbeams, and around the door frames, as these areas have a higher risk of weld cracking.

4. Surface Anti-Corrosion Treatment
For areas where the paint has peeled off, follow the process of 'paint removal → rust removal → anti-rust treatment → topcoat':

• Use sandpaper or sandblasting equipment to remove the old paint layer until the metal substrate is exposed.
• Use a wire brush or electric tool to grind the rusted area to the St2 standard (visible metallic luster).
• First, spray epoxy zinc-rich anti-rust paint, and after drying, cover with a topcoat that matches the original container color. The coating thickness should reach 80-120μm to meet anti-corrosion requirements.

Repair Precautions: All welding operations should be performed by certified welders to ensure that the weld quality meets the ISO 5817 standard; after anti-corrosion treatment, the container should be left to stand in a dry environment for more than 48 hours to avoid rain washing affecting the coating adhesion. It is recommended to conduct a structural inspection every 6 months for regular maintenance, and address sudden damage promptly for daily maintenance.