Design of Prefabricated Modular Housing

The design of prefabricated modular housing (modular construction) should adhere to the principles of standardization, factory production, and assembly, integrating policies and application scenarios to achieve efficient and environmentally friendly construction goals. The specific process is as follows:

I. Standardized and Modular Design

1. Module Splitting and Combination
   Buildings are divided into independent functional modules (such as bedrooms and bathrooms), each integrating structure, enclosure, piping, and decoration to form standardized prefabricated units. For example, the affordable housing project in Haidian District, Beijing, assembled a hundred-meter-high building using 6,028 concrete modules, achieving large-scale application.
2. Standardization of Dimensions and Interfaces
   Module dimensions must comply with transportation restrictions (e.g., width ≤ 3.5 meters) and lifting capacity. Interfaces use bolts, welding, or wet connection techniques to ensure structural safety. A project in Shanghai marked module information with an “ID card” system for precise assembly.
3. Parametric Design
   BIM technology is utilized to control the position of steel bars and piping layout with millimeter-level precision, reducing on-site adjustments. China Construction Hai Long Design Institute controls errors within allowable limits through parametric design, improving construction efficiency.

II. Factory Production and Quality Control

1. Industrialized Production Process
   Modules complete structural pouring, piping embedding, and decoration installation in the factory, using automated production lines (such as welding robots) to enhance efficiency. The China Construction Hai Long Industrial Park in Shenzhen, Guangdong, delivers 20,000 to 30,000 modules annually, enabling parallel multi-process operations.
2. Material and Process Selection
   • Structural Systems: Concrete modules offer strong earthquake resistance, steel modules provide high mobility, and steel-concrete composite modules balance strength and flexibility.
   • Enclosure Materials: Insulating, fire-resistant, and anti-corrosive materials (such as eco-friendly fine wood boards) are selected to meet energy-saving requirements.
   • Connection Technologies: Prestressed assembled integral frame structures (such as the Nanjing Jindi Yufang project) enhance overall stability.
3. Quality Inspection
   Airtightness, watertightness, and structural strength tests are conducted in the factory to ensure compliance with earthquake resistance (magnitude 8), fire prevention, and other standards, guaranteeing building safety.

III. Assembly Construction and On-Site Management

1. Rapid Assembly Technology
   Modules are transported to the site by tower cranes and assembled according to drawings, reducing construction periods by 50%-70%. For example, the affordable housing project in Shenzhen, Guangdong, shortened its construction period from 2.5-3 years to 1 year, and a rural house can be built in 14 days.
2. On-Site Collaborative Operations
   • Connection Methods: Modules are connected using cast-in-place concrete (enhancing integrity) or bolts (facilitating disassembly) to meet different needs.
   • Environmental Management: On-site labor is reduced by 50%, and noise, dust, and construction waste are decreased by 70%-80%, achieving green construction.
3. Logistics and Lifting Planning
   Transportation routes and lifting plans are designed based on module dimensions and weight to ensure safe and efficient operations. For example, box-type prefabricated buildings require advance planning of transportation equipment to avoid delays.

IV. Policy Support and Market Prospects

1. Policy Promotion
   • Guangzhou requires that the modular proportion of newly built resettlement housing be no less than 15% from 2026; Shenzhen plans to implement projects covering over 3 million square meters by 2028; Beijing has issued technical guidelines to standardize practices.
2. Market Potential
   The global modular construction market is expected to exceed $142.8 billion by 2030, with significant growth in China's prefabricated housing exports (e.g., Guangzhou Customs exported $140 million worth of movable houses in the first four months of 2026, a 38.1% year-on-year increase).

Through standardized design, factory production, and assembly construction, prefabricated modular housing can efficiently meet the needs of residential, school, hospital, and other scenarios, becoming an important direction for future construction development.