Factory Building Roof Prefabrication
Common types of factory building roof prefabrication include 'T'-shaped panel roof structures, prefabricated sandwich panels, and prefabricated assembled lightweight panels, each with its own characteristics.
The factory building of Guikeng Hydropower Station adopts a 'T'-shaped panel roof structure that combines panels and beams. This structure offers significant advantages. It reduces the difficulty of lifting and construction operations. During construction, compared to some complex structures, its lifting operations are simpler, which can minimize technical challenges and safety risks during the construction process. At the same time, it can also reduce project costs by optimizing the structural form and achieving effective cost control in terms of material usage and construction processes, thereby saving funds for the project construction.
Prefabricated sandwich panels are one-time pressed products from the factory, with the upper and lower color-coated steel sheets and the intermediate core material formed as a single unit. After being transported to the construction site, they can be directly lifted and laid, with the joints fixed, making them standardized finished panels with relatively convenient construction. However, they have certain limitations. Due to the length restrictions of truck transportation, they can generally only be transported up to 6 - 8 meters in length. When laid in large-span factory buildings, multiple overlapping joints must be reserved, and an increase in the number of joints raises the risk of water leakage. Moreover, as they are of standard size, a large amount of edge and corner gaps will be generated after cutting and fitting, making sealing difficult. They are highly prone to water leakage in complex working conditions such as old factory building renovations, irregular roofs, and multiple high-low spans. In addition, as large finished products, they require large trucks for transportation and cranes for lifting onto the site, which are greatly restricted by site road conditions.
Prefabricated assembled lightweight panels have outstanding advantages. Their system mainly consists of two parts: prefabrication and assembly. All components are processed in the factory and then quickly assembled on-site using welding techniques, greatly reducing the amount of wet work on-site. In terms of core structure, high-quality galvanized cold-formed thin-walled steel is used as the load-bearing framework, which is lightweight, strong, and corrosion-resistant, meeting the 50-year durability requirements for buildings. The framework is filled with Class A non-combustible thermal insulation material, giving the panels thermal insulation, fire resistance, and good sound insulation and absorption properties. The core advantages include significantly reducing structural loads and enhancing safety; quick construction, greatly shortening the project duration; multi-functional integration, meeting the stringent requirements of industrial buildings; and a wide range of applications, being mature and reliable.
