Prefabricated House Beam Construction Flow Chart

The construction process of prefabricated house beams mainly consists of six key steps: construction preparation, steel bar processing and binding, formwork installation, concrete pouring and curing, prestressed construction (post-tensioning method), and end-sealing and beam removal. Details are as follows:

1. Construction Preparation
The site needs to be leveled and functionally divided, with areas designated for steel bar processing, beam prefabrication, and finished beam storage. Materials such as steel bars, steel strands, anchors, cement, sand, and gravel must pass quality inspections and be reported for approval. Equipment, including mixers, gantry cranes, and tensioning devices, must be inspected and calibrated. Technically, design documents need to be reviewed to clarify construction parameters and quality requirements, ensuring all personnel involved are familiar with the process.

2. Steel Bar Processing and Binding
Steel bars are cut and bent according to design dimensions and then bound in the order of bottom plate → web plate → top plate. Prestressed ducts must be precisely positioned using “#”-shaped steel bars to prevent displacement during pouring. At the same time, prestressed anchor plates, corrugated pipes, and other embedded parts are installed, ensuring their positional deviations comply with specifications. If the pre-tensioning method is used, steel strands must be tensioned in advance and fixed to the abutment before binding non-prestressed steel bars.

3. Formwork Installation
Formwork must be cleaned and coated with a release agent to prevent concrete adhesion. The installation sequence is bottom formwork → side formwork → internal formwork, with verticality and flatness adjusted using leveling instruments and plumb lines, with errors controlled within allowable limits. Internal formwork is usually assembled in sections, with side panels secured using steel bars. For intelligent assembly line construction, hydraulic formwork is used, achieving precise positioning through an automated system.

4. Concrete Pouring and Curing
Concrete is mixed strictly according to the mix ratio, with the slump controlled within the range of 160-200mm. Pouring progresses in layers from one end, starting with the bottom plate, followed by the web plate and top plate, to avoid cold joints. Vibration is primarily carried out using high-frequency external vibrators, supplemented by immersion vibrators, to ensure compactness. Curing methods are selected based on environmental conditions, with steam curing requiring control of temperature gradients to prevent cracking, and natural curing requiring coverage with a moisture-retaining film to keep the surface moist until the design strength is reached.

5. Prestressed Construction (Post-Tensioning Method)
Tensioning of steel strands must be carried out in stages according to the design sequence, using both stress and elongation control to ensure effective prestress values. Grouting must be completed within 24 hours after tensioning, using a dedicated grouting material to fill the ducts and protect the prestressed tendons from corrosion. For intelligent assembly line construction, real-time pressure monitoring is achieved through automated grouting equipment, improving construction quality.

6. End-Sealing and Beam Removal
The end-sealing concrete must have the same strength grade as the beam. Before pouring, debris on the anchor surface must be cleaned, and after pouring, enhanced curing is required. Beam removal is carried out using gantry cranes or mobile trolleys, with the beams steadily transferred to the storage area using dedicated lifting devices. During storage, support timbers must be placed to prevent beam deformation. For intelligent assembly line construction, automation is achieved through modules such as transverse movement areas and steam curing areas, improving efficiency.

Additional Notes: For specific flow charts, it is recommended to refer to the "Technical Specifications for Construction of Highway Bridges and Culverts" (JTG/T 3650) or the "Technical Specification for Prefabricated Concrete Structures" (JGJ 1), or contact a professional design institute for standardized illustrations.