Prefabricated House Construction Flowchart

The prefabricated house construction process is divided into four stages: factory prefabrication, transportation, on-site assembly, and technical assistance, covering the entire chain from production to delivery.

I. Factory Prefabrication Stage

1. Modular Production: The house is divided into independent standard modules according to function (such as bedrooms, kitchens and bathrooms, corridors, etc.). All processes, including steel structure welding, wall laying, pre-embedding of water and electricity pipelines, door and window installation, and fine decoration, are completed in the factory to achieve 'finished products upon leaving the factory'. For example, prefabricated wall panels need to have water and electricity pipelines pre-embedded and interfaces reserved to ensure rapid on-site connection.
2. Coding and Protection: Modules are uniformly coded and classified for acceptance. They are treated with waterproofing, anti-corrosion, and anti-seismic measures to adapt to the ocean transportation environment. For example, steel structure modules need to be sprayed with anti-corrosion coatings, and doors and windows should be packaged with anti-collision materials to avoid damage during transportation.

II. Transportation Stage

1. Full-Vehicle Transfer: Modules are transported to domestic ports by special flatbed trucks. Their dimensions are compatible with international standard containers (such as 20-foot or 40-foot containers) to reduce transportation costs. For example, the weight of a single module needs to be controlled within the load-bearing capacity of the container to avoid overloading.
2. Ocean Logistics: Modules are shipped to destinations around the world by cargo ships. The transportation time varies depending on the destination: about 1 week for Southeast Asia, more than 20 days for the Middle East, and about 1 month for Europe and the United States. The entire process is tracked for location and monitored for status using Internet of Things technology.

III. On-Site Assembly Stage

1. Lifting and Connection: After being transported to the construction site, the modules are assembled in the order of their codes using cranes. The interfaces are fixed with high-strength bolts or welding, and the water and electricity pipelines are connected. For example, prefabricated wall panels need to be anchored to the foundation through reserved steel bars to ensure structural stability.
2. Efficiency Comparison: The assembly speed is significantly faster than traditional construction. Taking 63 elderly care apartments in the UK as an example, the assembly was completed in only 14 days, which is more than 60% shorter than the traditional construction period, and it also reduces the construction waste generated by on-site wet operations (such as bricklaying and plastering).

IV. Technical Assistance Process (Taking Prefabricated Shear Walls as an Example)

1. BIM Collaboration: Collision checks (such as conflicts between pipelines and structures) and process simulations (such as optimization of lifting sequences) are carried out through BIM software modeling, and RFID technology is used to track the location and status of components in real time.
2. Automated Production: Factory-based production is carried out according to component drawings. During transportation, the components are sorted according to the installation sequence and well-protected as finished products (such as covering with waterproof cloth and fixing anti-slip mats) to avoid on-site secondary adjustments.
3. On-Site Installation: This includes steps such as surveying and setting out, steel bar positioning, and grouting and caulking. For example, the lifting of prefabricated wall panels requires 10 detailed steps: lifting → positioning → temporary fixation → steel bar correction → grouting → sealing → quality inspection to ensure that the connection strength meets the design requirements.

The above process combines the general model of modular prefabricated houses with specific cases of prefabricated shear wall structures to form a standardized and efficient construction system.