Construction Plan for Prefabricated Houses

The construction plan for building prefabricated houses should cover core aspects such as project background, construction preparation, process flow, quality control, schedule arrangement, and cost control, as detailed below:

I. Project Background and Characteristics of Prefabricated Houses

Prefabricated houses are assembled on-site from components such as walls, roofs, and floor slabs that are standardized and produced in factories. Their key advantages include: Environmental protection and energy efficiency (reducing on-site pollution and energy consumption), fast construction speed (with a cycle 30%-50% shorter than traditional buildings), stable quality (standardized production reduces errors), and controllable costs (optimized material and labor efficiency).

II. Construction Preparation

1. Site Preparation: Level the site to the design elevation, set up temporary facilities (offices, warehouses), and ensure that the transportation road is at least 4 meters wide with a bearing capacity sufficient for heavy vehicles.
2. Personnel Organization: Form a professional team including a project manager, technicians, and quality inspectors, and conduct special training on component lifting and connection processes.
3. Material Management: Purchase prefabricated components according to the design list (with factory certificates required), stock auxiliary materials such as steel bars and cement, and store them separately in weatherproof sheds.

III. Construction Process

1. Foundation Construction:
   • Compact the foundation to a compaction degree of at least 93%, pour a C30 concrete strip foundation, and reserve embedded parts for component connections.
2. Component Transportation and Storage:
   • Secure components with specialized transport frames and place wooden blocks between layers to prevent deformation; stack them on-site in installation order with a maximum height of 6 layers.
3. Component Assembly:
   • Lifting Sequence: Start with corner columns, followed by middle columns, then install floor slabs and walls, and finally the roof.
   • Connection Methods: Use grout sleeves for column-to-foundation connections, bolts for wall-to-wall reinforcement, and apply special sealant at joints.
4. Decoration Works:
   • Indoor: Light steel keel partitions + gypsum board ceiling, with composite flooring.
   • Outdoor: Install thermal-break aluminum windows and doors, spray real stone paint on exterior walls, and lay anti-slip tiles on balconies.

IV. Quality Control

1. Material Inspection: Prefabricated components must have a dimensional deviation of no more than 3mm and a concrete strength of 100% of the design value before use.
2. Process Monitoring: Use a total station to calibrate verticality during lifting, with a deviation of no more than H/1000 (H being the component height).
3. Concealed Work Acceptance: Procedures such as foundation reinforcement and grout sleeve connections must be inspected and accepted by the supervisor before being concealed.

V. Schedule and Cost

1. Project Schedule: Foundation (15 days) → Component transportation (5 days) → Assembly (20 days) → Decoration (30 days) → Acceptance (5 days), with a total cycle of 85 days.
2. Cost Optimization: Reduce material costs by 10% through centralized procurement and minimize labor waste by 15% by optimizing processes with BIM technology.

VI. Key Considerations

• Lifting Safety: The tower crane's coverage must cover all work areas, and the lifting point of components should be at least 0.3L (L being the component length) from the end.
• Technical Process: After transferring the control axis, use a laser level to project the floor elevation line, install prefabricated wall panels one by one, and calibrate them.
• Deformation Prevention: Use dual-point lifting for internal and external wall installation, with a lifting speed of no more than 0.5m/min, and provide temporary support for at least 24 hours after positioning.

This plan should be dynamically adjusted according to project scale. For example, high-rise prefabricated houses require additional construction elevator configurations, and colder regions need extended component curing times.