Factory Roof Prefabricated Double-T Slab
The factory roof prefabricated double-T slab is a load-bearing component combining slab and beam, made of prefabricated reinforced concrete. It has both transverse and longitudinal load-bearing functions, offering advantages in terms of cost, construction, and performance. Selection should be based on specific scenarios and regulatory requirements.
Structural and Material Characteristics
The prefabricated double-T slab consists of a wide panel and two narrow, high ribs, with cross-sections available in uniform and double-slope variable types. Its span can exceed 30 meters (with products manufactured in Hubei reaching a maximum span of 40 meters), and the panel width typically ranges from 1.2 to 3 meters. The materials used include 30-50 MPa concrete and prestressed steel, with main reinforcement selected from prestressed high-strength carbon steel wires or strands, such as 1570 MPa spiral-ribbed wires with nominal diameters of 7mm and 9mm, or 1860 MPa seven-strand strands with nominal diameters of 12.7mm and 15.2mm. This design results in a lightweight yet high-load-capacity structure, which can also meet seismic, fire, and thermal performance requirements through specialized design.
Application Advantages
- Significant Cost-Effectiveness: The initial construction cost is approximately 600 yuan per square meter, 25% lower than that of steel structures. It requires no maintenance over 50 years, whereas steel structures incur maintenance costs as high as 200 yuan per square meter. Additionally, double-T slabs can reduce the number of load-bearing walls by 70%, and when used in grain silos, they can increase storage space by 25%.
- High Construction Efficiency: Prefabricated in factories and then transported to the site for installation, a 10,000-square-meter factory building can save 40% of the construction time, significantly shortening the overall project duration.
- Superior Performance: Taking a 30-meter span as an example, the slab sags only 12 millimeters when bearing 1.5 times its weight, with minimal crack width. Its structural stability has been proven in practice, meeting the load-bearing requirements of large-span factory buildings.
Selection and Usage Specifications
Selection should refer to the 18G432-1 atlas and be adjusted according to the usage scenario:
- Chemical Plant Workshops: Corrosion-resistant double-T slabs should be selected to withstand chemical erosion.
- Coastal Areas: Products with a fire rating of Class I should be chosen to enhance disaster resistance.
Double-T slabs produced in Hubei, due to their high material strength, can reach a maximum span of 40 meters, making them suitable for industrial buildings with higher space requirements.
