Prefabricated House Assembly Plan

The prefabricated house assembly plan should cover five key stages: design, production, transportation, installation, and quality control, achieving efficient construction through standardized and modular processes.

I. Design Phase

1. Design Principles
   • Functionality and Safety: Meet building usage requirements and ensure structural safety and stability, such as verifying load-bearing capacity through mechanical calculations when using prefabricated assembly structures.
   • Green Concept: Prioritize the use of eco-friendly and energy-saving materials (e.g., recycled concrete, low-emissivity glass) to reduce energy consumption and carbon emissions.
   • Industrial Adaptability: Design should accommodate standardized factory production, with module dimensions complying with transportation limits (e.g., width ≤ 3.5 meters) to minimize on-site processing.
2. Design Content
   • Architectural and Structural Design: Define functional zones (e.g., bedroom and kitchen layouts), adopt lightweight steel structures or concrete modular systems, and ensure the strength of connection nodes.
   • Equipment and Material Selection: Match building functional requirements, such as selecting integrated bathroom modules and photovoltaic-integrated roofs.

II. Production Phase

1. Production Process
   • Component Manufacturing: Produce wall panels, floor slabs, and other components in the factory according to design drawings, using high-precision molds to control dimensional deviations (e.g., within ±2mm).
   • Module Assembly: Pre-assemble components into complete modules (e.g., wall modules with doors and windows) to reduce on-site construction volume.
   • Quality Inspection: Check for surface defects (e.g., cracks, honeycombing) and connection node strength (e.g., bolt torque testing) in components, and retain inspection reports.
2. Production Requirements
   • Comply with national standards (e.g., Technical Specification for Cold-Formed Thin-Wall Steel Structures) to ensure component durability and fire resistance.

III. Transportation Phase

1. Transportation Methods
   • Select flatbed trucks for short distances or trailers for long distances. Special transportation permits are required for oversized components.
2. Transportation Requirements
   • Protective Measures: Package components with rain and shock protection, such as wrapping edges with foam boards to prevent transportation damage.
   • Route Planning: Avoid congested roads and height-restricted areas. Transportation vehicles should undergo regular maintenance (e.g., checking tire pressure and brake systems).

IV. Installation Phase

1. Installation Process
   • Site Preparation: Clear the site and ensure foundation bearing capacity meets design requirements (e.g., compaction degree ≥ 95%).
   • Component Lifting: Use cranes to lift modules to designated positions, following the principle of "bottom-up, heavy-first, light-last" for lifting sequence.
   • Connection and Acceptance: Secure modules with bolts or welding, correct verticality and levelness, and then conduct acceptance.
2. Installation Requirements
   • Comply with the Quality Acceptance Standard for Steel Structure Engineering, such as ensuring bolt tightening torque reaches at least 90% of the design value.

V. Quality Control

• Full-Process Monitoring: Review drawings during the design phase, conduct spot checks on components during production, record vehicle status during transportation, and perform phased acceptance during installation.
• Typical Case: The Guangdong Shenzhen affordable housing project used 6,028 concrete modules, shortening the construction period to one year and reducing on-site labor by 50%.

VI. Advantages and Precautions

• Advantages: Construction period is 30%-50% shorter than traditional buildings, with high quality controllability and approximately 20% less material waste.
• Precautions: Establish a collaborative system for technology, production, and industrial clusters. Strictly adhere to safety regulations during installation (e.g., setting up warning zones and wearing safety harnesses).