Construction Drawings of House Prefabricated Slabs

Construction drawings of house prefabricated slabs need to be drawn in combination with professional design specifications and on-site conditions. Currently, specific drawings cannot be directly provided, but key design points and acquisition methods can be explained. Construction drawings of prefabricated slabs are core documents guiding the production and installation of prefabricated concrete components. Their design should follow the principles of structural safety and convenient construction. The following explains from three aspects: design points, specification references, and drawing collection references:

I. Selection of Prefabricated Slab Types

The type of prefabricated slab directly affects the design of construction drawings. Common types include:

1. Prestressed Hollow Slabs: These slabs use prestressed technology to enhance crack resistance and are suitable for large-span floor or roof systems. In construction drawings, slab thickness (e.g., 120mm, 150mm), hole dimensions, and prestressed reinforcement layout should be indicated.
2. Solid Slabs: These slabs have lower load-bearing capacity and are mostly used for non-load-bearing partitions or small-span floors. The construction drawings should specify slab thickness (usually 60-80mm) and reinforcement ratio.
3. Channel Slabs: These slabs have a channel-shaped cross-section, which reduces self-weight and increases stiffness. They are suitable for industrial plants or large-space buildings. The construction drawings should indicate channel opening dimensions and rib reinforcement.

Design Points: Select slab types based on building function, load requirements, and span. For example, prestressed hollow slabs are preferred for residential floors to balance load-bearing capacity and cost-effectiveness.

II. Cast-in-Place Strip and Splicing Design

The installation of prefabricated slabs requires coordination with cast-in-place strips to enhance overall integrity. The construction drawings should specify the following:

1. Location of Cast-in-Place Strips: These strips are usually placed directly above load-bearing walls and at the splicing points of prefabricated slabs, with a typical width of 150-200mm to transfer loads and prevent cracks.
2. Reinforcement Connection: The ends of prefabricated slabs should have reserved reinforcement, which should be tied or welded with the reinforcement in the cast-in-place strips. The construction drawings should indicate reinforcement diameter, spacing, and anchorage length.
3. Splicing Treatment: Slab joints should be filled with fine aggregate concrete, with a width controlled between 30-50mm. The construction drawings should specify filling materials and curing requirements.

Example: If prestressed hollow slabs are used, the construction drawings may indicate "slab joint width of 40mm, with Φ6@200 reinforcement inside, filled with C30 fine aggregate concrete".

III. Specification References and Drawing Collection References

The design of construction drawings for prefabricated slabs should comply with national specifications and refer to standard drawing collections:

1. Specification Requirements: Determine reinforcement ratio and crack width limits according to the "Code for Design of Concrete Structures" (GB 50010); set seismic detailing measures according to the "Code for Seismic Design of Buildings" (GB 50011).
2. Drawing Collection References: Refer to drawing collections such as the "Drawing Collection of Prestressed Concrete Hollow Slabs" (03SG435-1) and the "Standard for Inspection of Structural Performance of Prefabricated Concrete Components" (GB/T 50204) to obtain slab dimensions, reinforcement details, and construction points.

Recommendation: For detailed construction drawings, a professional structural engineer should be commissioned to conduct customized design based on building loads, geological conditions, and other parameters to avoid safety hazards caused by directly applying drawing collections.