Second-Level Construction Prefabricated House Structural Diagram

The second-level construction prefabricated house structural diagram primarily involves different systems and their characteristics of prefabricated assembled building technology. The following provides an introduction from three aspects: technical systems, typical cases, and prefabricated components and connection methods:

I. Technical Systems of Prefabricated Assembled Building Technology The technical systems of prefabricated assembled building technology encompass various types, commonly including the composite shear wall (PCF) system, cast-in-place external hanging system, assembled monolithic shear wall system, and assembled monolithic frame system. These systems are selected based on differences in building functions, seismic requirements, and construction conditions. For example, high-rise buildings tend to adopt the assembled monolithic shear wall system with good seismic performance, while large-span commercial buildings may choose the assembled monolithic frame system with flexible floor plan layouts.

II. Characteristics and Cases of Typical Technical Systems

1. Composite Shear Wall (PCF) System: With a prefabrication rate of approximately 20%, partial assembly is achieved through prefabricated components such as stairs, balconies, and air conditioning panels. A typical case is the Shanghai Vanke Pudong Golden Mileage Project, where the structural diagram needs to clearly define the connection node designs between prefabricated components and cast-in-place parts.
2. Cast-in-Place External Hanging System: The connection between the external hanging wall panels and the main structure is simple, and construction speed is fast. However, attention must be paid to the deformation coordination between the wall panels and the main structure. The Zhejiang Hangzhou Vanke Beichen Zhiguang Project adopts this system, and the structural diagram needs to highlight the anchoring methods and waterproofing details of the external hanging wall panels.
3. Assembled Monolithic Shear Wall System: Suitable for high-rise buildings, the prefabrication rate can reach 25% to 80%. It offers excellent seismic performance and flexible floor plan designs. The Shanghai Vanke Pudong Sea Legend Project achieves a balance between high prefabrication rates and structural safety by optimizing the layout of shear walls. The structural diagram needs to detail the splicing nodes of shear walls and the connection methods of reinforcing bars.
4. Assembled Monolithic Frame System: This technology is mature, with a wide range of prefabrication rates (15% to 80%), suitable for large-span buildings. The Shanghai Greenland Hongkou Commercial and Office Building Project adopts this system, and the structural diagram needs to clearly define the division of prefabricated components for frame columns and beams, as well as the cast-in-place range of node areas.

III. Prefabricated Components and Connection Methods The core of the prefabricated house structural diagram is component division and connection design. Common prefabricated components include concrete columns, beams, shear walls, floor slabs, and stairs. Connection methods need to be selected based on load-bearing requirements:

• Grout Sleeve Connection: Used for the longitudinal reinforcement connection between columns and columns, it achieves reinforcement force transmission through high-strength grout. The structural diagram needs to indicate the sleeve positions and grout hole sizes.
• Cast-in-Place Node Areas: Beam-column connections often adopt a 'wet' connection form, ensuring node integrity through cast-in-place concrete. The structural diagram needs to specify the range of cast-in-place areas and the lap lengths of reinforcing bars.
• Mechanical Connection: For example, bolt connections are used for non-load-bearing components or auxiliary connections. The structural diagram needs to indicate bolt specifications and installation requirements.

The design of the structural diagram needs to consider the characteristics of specific systems to ensure the feasibility of component production, transportation, and installation, while meeting structural safety and functional requirements.