Atlas of Eaves Design for Prefabricated Houses

Currently, there is no complete publicly available information specifically targeting the 'Atlas of Eaves Design for Prefabricated Houses.' However, the key steps and operational points for constructing eaves on houses can be summarized as follows. Specific implementation should be combined with professional design drawings or consultation with architects.

I. Design and Planning Phase

1. Determination of Dimensions and Shapes
   Based on the overall architectural style of the house (e.g., modern, traditional Chinese) and functional requirements (e.g., rain protection, decoration), determine the projection length (typically 0.6-1.2 meters), width, and cross-sectional shape (e.g., rectangular, curved) of the eaves. Environmental factors such as local rainfall and wind pressure should be considered to ensure smooth drainage and structural safety.
2. Structural Design
   The eaves must be reliably connected to the main structure, typically using reinforced concrete cantilever structures or steel structural supports. During design, calculate loads (e.g., self-weight, wind load, snow load) to ensure that the reinforcement ratio and concrete strength grade (e.g., C30) meet regulatory requirements, preventing cracking or deformation.

II. Construction Preparation Phase

1. Material Preparation
   • Reinforcing Bars: Select HRB400-grade hot-rolled ribbed bars, with diameters determined by design (e.g., Φ10-Φ12).
   • Concrete: Use ready-mixed concrete or on-site mixing, controlling slump (160-180mm) and pouring speed.
   • Formwork: Use 18mm-thick wooden formwork or steel formwork, ensuring a flat surface without deformation.
2. On-site Preparation
   Clear the construction area, erect scaffolding to 1.5 meters below the eaves, and set up protective netting; check the accuracy of the reserved reinforcing bar positions in the main structure, with deviations controlled within ±5mm.

III. Construction Steps

1. Formwork Installation
   • Fix the bottom and side formwork according to design dimensions, using tie rods or diagonal braces for reinforcement to prevent bulging.
   • Apply double-sided tape at formwork joints to prevent grout leakage; securely fix pre-embedded drainage pipes (e.g., Φ50 PVC pipes) during installation.
2. Reinforcing Bar Binding
   • Weld or mechanically connect the main bars to the reserved reinforcing bars in the main structure, ensuring weld lengths meet specifications (e.g., single-sided welding 10d).
   • Space distribution bars evenly (e.g., 150mm), with stirrup hook angles at 135°, and ensure all binding points are securely fastened.
3. Concrete Pouring
   • Pour in layers (each layer thickness ≤500mm), using an immersion vibrator to vibrate until surface grout appears, avoiding over-vibration or under-vibration.
   • Perform secondary vibration and smoothing at the end of the eaves to reduce shrinkage cracks.
4. Curing and Formwork Removal
   • Cover with plastic film for moisture-retaining curing within 12 hours after pouring, with a curing period ≥14 days.
   • Remove formwork after the concrete strength reaches 75% of the design value (usually 7-10 days), avoiding damage to edges and corners during removal.

IV. Subsequent Treatment

1. Surface Treatment
   Sand the concrete surface burrs, clean formwork residues; repair honeycombs, pits, and other defects with cement mortar and smooth them out.
2. Waterproofing Treatment
   • Apply a 2mm-thick polyurethane waterproof coating on the top, extending more than 300mm onto the wall.
   • Adhere self-adhesive waterproof membranes on the sides, with an overlap width ≥100mm, and seal the edges with sealant.

For detailed methods of prefabricated components (e.g., PC eaves), contact the prefabricated component manufacturer for production drawings and installation guidelines. The construction process must strictly adhere to relevant standards such as the 'Code for Acceptance of Constructional Quality of Concrete Structures' (GB50204).