How to Prefabricate Color Steel Houses

The prefabrication process of color steel houses mainly includes five core steps: raw material processing, forming processing, structural welding and assembly, integrated installation, and modular design. The specific process is as follows:

1. Raw Material Processing
The first step in prefabricating color steel houses is to procure raw materials that meet standards, typically hot-dip galvanized steel sheets or colored coated steel sheets. These steel sheets need to be unrolled by an uncoiler, flattened by a leveling machine to eliminate deformation, and then cut into plate materials of specific sizes according to design requirements. In this step, it is necessary to strictly control the thickness, flatness, and cutting accuracy of the plate materials. For example, roof panels commonly use steel sheets with a thickness of 0.5-1.0mm, while wall panels may adopt thicker specifications to enhance structural stability.

2. Forming Processing
The processed flat plates are cold-formed into specific wave shapes or sandwich structures by a roll forming machine. For single-layer color steel corrugated sheets, the machine presses them into a wavy shape to enhance bending resistance. If thermal insulation is required, materials such as rock wool, glass wool, or polyurethane are simultaneously filled to form composite wall panels. For instance, the thermal conductivity of polyurethane sandwich panels can be as low as 0.024W/(m·K), significantly improving the house's thermal insulation effect. During the forming process, it is necessary to monitor the bending radius of the plates and the filling density in real-time to avoid hollowing or deformation.

3. Structural Welding and Assembly
The processed color steel plates need to be fixed to light steel frames (such as C-shaped steel and H-shaped steel) through welding or bolt connections. Wall panels are usually supported by vertical studs, while roof panels are fixed by purlin systems to form an overall load-bearing structure. Key connection parts need to be reinforced, for example, by using high-strength bolts or full-welding processes to ensure that the structure can withstand wind loads of up to Level 12 or above. After assembly, verticality and flatness inspections are required, with errors controlled within ±3mm.

4. Integrated Installation
Some factories complete the pre-assembly of houses in the workshop, including positioning door and window frames, embedding electrical pipelines, and fixing sanitary facilities. For example, using PVC conduit embedding technology can avoid structural damage caused by later slotting; wall decorative layers may be directly pasted with PVC扣板 (PVC trim panels) or sprayed with fire-resistant coatings. This step must strictly comply with building electrical codes to ensure that pipeline spacing and grounding protection meet safety standards.

5. Modular Design
For large-scale color steel house projects, a modular prefabrication method is often adopted. The building is divided into standard-sized units (such as independent modules of 3m×6m), and each unit completes the integrated installation of walls, roofs, pipelines, and interior decorations in the factory. The modules are quickly spliced together with high-strength connectors and can be assembled within a few hours after being transported to the site, significantly shortening the construction period and reducing on-site work volume.