Prefabricated House Construction Flowchart

The construction process of a prefabricated house typically includes key steps such as design planning, factory production, transportation, on-site installation, and acceptance inspection. Details are as follows:

1. Design Planning Phase
Customized design of the prefabricated house must be completed based on usage requirements, site conditions, and regulatory requirements. The design includes architectural floor plan layout, structural form (such as steel structure or concrete frame), component splitting plan (dividing the entire building into prefabricated units like wall panels, floor slabs, beams, and columns), and node connection methods. The design must meet safety standards for earthquake resistance and fire prevention, and clearly specify component dimensions, embedded part locations, and installation sequences. For example, steel-structure prefabricated houses need to mark the welding or bolt connection nodes of steel components, while concrete prefabricated houses need to determine the layout of prestressed tendons and grouting hole positions.

2. Factory Production Phase
Batch production of prefabricated components is completed in the factory according to the design drawings. The production process includes mold making, steel bar tying, concrete pouring (or steel structure processing), curing, and surface treatment. For example, concrete wall panels need to be vibrated and compacted on a vibration table and reach the designed strength under standard curing conditions; steel structure components need to undergo anti-corrosion coating treatment. Strict quality inspections are required during production to ensure that component dimensional deviations and the positional accuracy of embedded parts comply with regulations (such as GB/T 51231-2016 'Technical Standard for Prefabricated Concrete Buildings').

3. Transportation and On-site Preparation Phase
Prefabricated components are transported to the construction site by specialized transport vehicles, and protective measures must be selected according to the component type (such as standing wall panels and securing them with straps to avoid collision damage). On-site, foundation construction (such as strip foundations or pile foundations) must be completed and accepted as qualified. At the same time, the component stacking area (stored in zones according to the installation sequence) and the travel route for lifting equipment must be planned. For example, the coverage area of a tower crane needs to cover the main installation area to avoid secondary handling.

4. On-site Installation Phase
Component lifting is carried out according to the principle of 'bottom-up, main-to-secondary'. Usually, the bottom-floor wall panels or steel columns are installed first, fixed with temporary supports, and then the floor slabs are installed, followed by construction layer by layer upwards. Node connections must adopt the methods required by the design (such as grouting sleeve connections, welding, or bolt connections), and the verticality and flatness must be monitored in real-time. For example, when connecting concrete components with grout, the fluidity and fullness of the grout must be controlled, and non-destructive testing is required for steel structure welding.

5. Acceptance Inspection and Finalization Phase
After installation is completed, an overall acceptance inspection is carried out to check structural safety (such as load tests), waterproof performance (such as node sealing treatment), and decoration quality (such as wall flatness). The acceptance is based on design documents, construction specifications, and local standards (such as JGJ 1-2014 'Technical Specification for Prefabricated Concrete Structures'). After the acceptance is qualified, temporary supports are removed, and finalization work such as exterior wall decoration, equipment pipeline installation, and interior decoration is completed.