Temporary Container House Repair Plan

The repair plan for temporary container houses should be formulated in combination with their structural characteristics and common damage forms, covering key aspects such as main structure reinforcement, waterproof and moisture-proof treatment, water and electricity system inspection and repair, and daily maintenance.

I. Main Structure Repair
The main structure of container houses is primarily composed of light steel frames. Long-term use or external impacts may lead to weld cracks and frame deformation. During repair, first clean the damaged area, grind and derust the cracked welds, and then re-weld them using carbon dioxide gas shielded welding to ensure full and pore-free welds. If the frame is bent and deformed, use a hydraulic jack along with straightening tools to gradually restore it to its original position. After straightening, check the verticality and levelness, with an error tolerance of no more than 3mm/m. For severely rusted steel components, first grind them with a grinding wheel until the metal luster is exposed, then apply two coats of epoxy zinc-rich primer and one coat of polyurethane topcoat, with a corrosion-resistant layer thickness of no less than 120μm.

II. Waterproof and Moisture-Proof Treatment
Cracks are prone to form at the joints between the roof and walls of container houses due to thermal expansion and contraction, leading to rainwater leakage. During repair, first remove the original sealant at the joints, blow away dust with high-pressure air, then fill the gaps with polyurethane foam sealant, and finally apply a 1.5mm thick layer of non-curing rubber asphalt waterproof coating, covered with a 200g/㎡ polyester non-woven fabric reinforcement layer. Wall moisture return is often caused by moisture absorption by rock wool sandwich panels. To address this, install a 10mm thick extruded polystyrene board insulation layer on the inner side of the wall and apply waterproof interior wall paint.

III. Water and Electricity System Inspection and Repair
Electrical circuit failures are often caused by aging wires or loose connections. Regularly check the reliability of circuit breakers and leakage protectors in the distribution box, and replace aging wires (it is recommended to replace all wires every 3 years). For the water supply system, focus on checking for leaks at the connections of PPR pipes. For frozen and cracked pipes, cut them off and reconnect them using a hot-melt machine, and install heating tapes in northern regions to prevent freezing in winter. Water and electricity renovations should comply with the "Code for Acceptance of Construction Quality of Building Electrical Engineering" (GB50303-2015) and the "Code for Acceptance of Construction Quality of Building Water Supply and Drainage and Heating Engineering" (GB50242-2002). Unauthorized connections are strictly prohibited.

IV. Daily Maintenance Points
It is recommended to conduct a comprehensive maintenance every six months, including checking the tightness of anchor bolts, clearing debris from drainage ditches, and testing the sealing performance of doors and windows. For mobile container houses, regularly check the wear degree of lifting corners. If the wear exceeds 20% of the original size, replace them immediately. For long-term idle container houses, cover them with waterproof cloth and place desiccants inside to prevent condensation.