Prefabricated Building Segmentation Plan

The prefabricated building segmentation plan requires systematic planning from three aspects: modular segmentation, prefabricated structural segmentation, and demolition construction plans. The specific key points are as follows:

1. Modular Building Segmentation
Modular buildings achieve efficient construction through factory-prefabricated independent housing modules. Each module completes the main structure, water and electricity pipelines, waterproofing, and interior decoration (such as bathroom fixtures, cabinets, wardrobes, etc.) in the factory. After being transported to the site, they are assembled into a complete building through lifting and joining. For example, a retirement apartment project in the UK used 63 modules manufactured in China. After being shipped from the factory to a UK port, the on-site assembly was completed in just two weeks, significantly shortening the construction period and reducing on-site construction pollution. Modular segmentation requires advance planning of module dimensions, interface forms, and transportation routes to ensure compatibility during factory production, transportation, and on-site assembly.

2. Prefabricated Building Structural Segmentation
Structural segmentation must balance production efficiency and construction convenience. Beam-column design should reduce the number of secondary beams, and the cross-sectional dimensions of components must match the boundary conditions of factory production equipment (such as mold specifications and lifting capacity). Shear wall layout should prioritize L- and T-shaped shear walls, avoiding additional structures at the flanges to prevent overly fragmented exterior wall segmentation. For flange lengths, there are two design approaches:

• Approach 1: The flange length of L-shaped exterior walls ≤ 600 mm, and the flange length of T-shaped walls ≤ 1000 mm, to simplify the segmentation process.
• Approach 2: The flange length of L-shaped exterior walls ≥ 600 mm, and the flange length of T-shaped walls ≥ 1000 mm, with the flange ends extending to the window edges to optimize structural load-bearing.
  Design decisions should be made by considering building functions, seismic requirements, and factory production capacity.

3. Prefabricated House Demolition Construction Plan
For the demolition of prefabricated houses in urban renewal projects, classification and handling should be based on structural safety, planning adjustments, or comprehensive assessments. Before demolition, the construction unit must commission a Class A qualified testing agency to conduct a housing safety appraisal, including structural damage detection, foundation deformation observation, and seismic capacity verification, to provide a basis for the demolition plan. The demolition plan must specify construction methods (such as mechanical demolition, static cutting), safety protection measures (such as dust and noise reduction, temporary support), and waste disposal procedures. Additionally, a resident compensation and resettlement plan must be formulated, offering multiple options such as monetary compensation, property rights exchange, housing vouchers, or original-site reconstruction to ensure social stability. For example, an old residential community renovation project adopted an "original-site reconstruction" model, rebuilding a prefabricated structure after demolishing the prefabricated floor slabs, which preserved the residents' original living circle while improving building performance.