Plumbing and Electrical Renovation Drawing for Prefabricated Slab Houses

For the plumbing and electrical renovation of prefabricated slab houses, special attention should be paid to pipeline reservation, point positioning, socket and junction box layout, and other special requirements. The specific design points are as follows:

1. Pipeline Reservation and Embedding
The plumbing and electrical pipelines in prefabricated slab houses need to be planned and reserved or embedded in advance to avoid damaging the structure through later trenching. Pipes passing through prefabricated floor slabs require reserved holes, while those passing through prefabricated beams need embedded sleeves to ensure no conflict between the pipelines and structural components. Vertical electrical pipelines should be uniformly arranged within the prefabricated slabs. Vertical pipelines within wall panels should maintain a safe distance (e.g., ≥300mm from gas pipelines) to prevent electromagnetic interference or safety hazards. If composite floor slabs are involved, deep junction boxes should be embedded in the cast-in-place layer for easy installation of lighting fixtures later.

2. Precision in Point Positioning
Electrical points (such as sockets and switches) need to be precisely positioned, especially in areas involving the splicing of prefabricated slabs. Once the strong and weak current points are processed in the PC formwork, changes are difficult. Therefore, it is necessary to fully communicate with the owner about their needs in the early design stage, clarifying details such as furniture placement and appliance locations. For example, the height of sockets on a TV backdrop wall should be determined in advance (usually 300-400mm from the floor) to avoid being blocked by furniture.

3. Specifications for Sockets and Junction Boxes

• Socket Layout: Sockets should be placed between steel bars to avoid damaging the structural load-bearing capacity. The lower side is usually 300mm from the floor, with reserved wiring slots for easy pipeline connection.
• Electrical Box Space: The upper and lower parts of the strong and weak current boxes in the household should each reserve 400mm of space for pipe connection to ensure neat pipeline laying.
• Junction Box Types: For lighting pipelines laid along the cast-in-place layer of composite floor slabs, deep junction boxes should be used. Their depth should meet the requirements of the cast-in-place layer thickness (usually ≥50mm) to prevent the box body from being exposed.

4. Other Key Requirements

• Household Distribution Box: The location should be clear and easy to operate. Electrical equipment (such as sockets and switches) installed on both sides of the partition wall between households should be set up without connection to avoid safety hazards from cross-household electricity use.
• Partition Wall Requirements: When reserving electrical equipment within partition walls, requirements for sound insulation (such as filling with soundproof cotton) and waterproofing (such as applying waterproof coatings on bathroom walls) should be met to prevent noise or leakage problems.
• Measures for Pipes Passing Through Floor Slabs: Measures such as waterproofing (e.g., applying waterproof coatings), fireproofing (e.g., wrapping with fireproof rock wool), and sound insulation (e.g., laying soundproof pads) should be taken at the parts where equipment pipelines pass through floor slabs to ensure safety and comfort during use.

The plumbing and electrical design of prefabricated slab houses should balance structural safety and usability. By strictly adhering to principles such as reservation and embedding, precise positioning, and standardized installation, the risk of later rework can be effectively reduced.