Third-Floor Prefabricated House Structure Diagram

Currently, a complete drawing of the 'third-floor prefabricated house structure diagram' is not directly provided, but adaptive reference can be made through the roof structure designs of relevant cases.

I. Referenceable Roof Structure Design Cases

1. Brick-Concrete Flat Roof Design in Case
   This case involves a compact three-story flat-roof building of approximately 100 square meters. The drawings include a roof plan, sectional views, and structural construction instructions, clearly labeled as a brick-concrete flat roof design. The core design points include:

   • Roof Load Calculation: Structural verification must be conducted based on the self-weight of prefabricated panels, construction loads, and usage loads (such as snow accumulation and personnel activities) to ensure that the beam and slab bearing capacities meet regulatory requirements.
   • Prefabricated Panel Layout: Flat roof prefabricated panels are typically arranged as one-way or two-way slabs, with slab thickness (e.g., 120mm or 150mm) selected according to the span. Expansion joints and structural column positions should be reserved.
   • Waterproofing and Insulation: The construction instructions emphasize the need for a waterproof layer (such as SBS modified asphalt membrane) and an insulation layer (such as extruded polystyrene board) on the roof. The joints between prefabricated panels should be filled with waterproof mortar.
     Adaptability Suggestions: The roof plan of this case can be directly referenced to adjust the dimensions of prefabricated panels. Node details (such as the connection method between prefabricated panels and ring beams) should be supplemented in accordance with prefabricated component construction specifications.

2. Wooden Structure Sloped Roof Design in Case
   Although it is a wooden structure, this case provides detailed drawings of roof structural nodes (such as ridge, eave, and gable treatments), which can serve as a reference example for the structural design of prefabricated component roofs. The key design logic includes:

   • Drainage Slope: A sloped roof must ensure a minimum drainage slope (such as 1:50). The drainage direction and slope of a prefabricated component roof can be designed following this principle.
   • Node Construction: Ventilation structures should be provided at the ridge, drip lines should be designed at the eaves, and the gable should be reliably connected to the roof structure. These details can be transformed into node designs for prefabricated component roofs.
     Adaptability Suggestions: Transform wooden structural nodes into concrete or steel structural nodes, such as replacing wooden ridges with prefabricated concrete ridge components, and supplementing with steel bar anchoring details.

II. Considerations for Prefabricated Component Roof Design

1. Structural Safety: The span, reinforcement ratio, and deflection of prefabricated panels must be verified in accordance with the 'Concrete Structure Design Code' to prevent cracking due to self-weight or loads.
2. Construction Feasibility: The dimensions of prefabricated panels must consider transportation and lifting limitations (such as a single panel weight not exceeding 2 tons). Sufficient operating space should be reserved at joints for joint filling construction.
3. Regulatory Compliance: Roof design must meet the requirements of the 'Building Seismic Design Code' and the 'Roof Engineering Technical Code'. For example, the connection between prefabricated panels and the main structure should adopt flexible nodes to accommodate seismic deformation.

For further detailed design, it is recommended to deepen the design by combining the roof construction instructions of Case with the technical parameters provided by the manufacturer of the prefabricated components.