Modular Prefabricated House Construction

Modular prefabricated house construction involves disassembling a building into independent modules, prefabricating them in a factory, and then transporting them to the site for assembly into a complete structure.

I. Construction Process The construction of modular prefabricated houses centers around factory-based production. Components such as ceilings, floors, and plumbing and electrical systems are prefabricated on factory assembly lines. More complex parts, like walls and bathroom waterproofing layers, are produced in stages in multi-story workshops. Taking the China Construction HaiLong Intelligent Construction Industrial Park as an example, scattered components are first processed separately on the second or third floors and then transported to the final assembly station via an automated conveyor system, where robotic welding arms and other equipment complete the assembly of the module's main body. This production method achieves standardization and refinement of building components, ensuring dimensional accuracy and consistent quality for each module.

II. On-Site Assembly Features After being transported to the construction site, the prefabricated modules are assembled using a “building block” technique. The modules are connected to form the overall structure through high-strength bolts or welding processes. The assembly process relies on precise positioning systems and mechanized lifting equipment to ensure that the alignment error between modules is controlled within millimeters. For instance, a public housing project in Shenzhen, Guangdong, assembled five nearly 100-meter-high residential buildings using 6,028 concrete modules. On-site work was limited to module positioning, connection node treatment, and a small amount of decoration, significantly simplifying the construction process.

III. Advantages Over Traditional Construction Methods

1. Construction Efficiency: The construction period for modular buildings can be reduced by over 60%. The completion and delivery time for the Shenzhen project was shortened from 2.5-3 years under traditional methods to just 1 year, with on-site labor reduced by about 50%.
2. Quality Control: The factory environment eliminates weather interference, and when combined with automated production lines and strict quality inspection processes, ensures that component strength, waterproofing performance, and other indicators are superior to those of on-site construction.
3. Environmental Benefits: Reduced on-site work results in an over 80% decrease in noise and dust pollution, along with a roughly 70% reduction in construction waste generation. It also alleviates pressure on surrounding traffic caused by construction activities.
4. Maintenance Convenience: The modular design facilitates later inspection, repair, and upgrades. For example, plumbing and electrical systems are embedded within individual modules, allowing for maintenance without damaging the overall structure.

IV. Typical Case The Shenzhen public housing project achieved efficient construction through modular technology. Its concrete modules integrated walls, floors, and piping systems, with the on-site assembly phase completing the main structure in just 120 days, more than twice as fast as traditional methods. The project also demonstrated the applicability of modular construction in high-rise residential buildings, providing a new paradigm for rapidly delivering high-quality housing in densely populated urban areas.