Prefabricated Composite Slab Housing

Prefabricated composite slabs have high application value in housing construction, suitable for high-rise buildings, large-span structures, and some rural self-built houses. Their construction must strictly adhere to technical specifications to ensure structural safety and performance.

1. Structural Characteristics and Application Scenarios

Prefabricated composite slabs consist of a prefabricated panel and a cast-in-place reinforced concrete layer. The prefabricated panel serves both as a structural component and a permanent formwork. The cast-in-place layer can accommodate piping and be filled with expanded polystyrene boards to form a box-shaped cross-section, reducing self-weight and improving sound insulation. Their typical span ranges from 4 to 6 meters, with the cast-in-place layer thickness usually not less than 90 millimeters, depending on the span. This structure combines prestressed thin panels with a cast-in-place layer, with the thin panel surface treated with roller indentations to enhance bonding performance, ensuring overall continuity. It is suitable for high-rise buildings, large-span structures, and scenarios requiring high construction efficiency. In rural self-built houses, there are application cases abroad where composite slabs can be used as bottom formwork with floor reinforcement, requiring individual lifting and subsequent pouring of upper concrete, but attention must be paid to transportation and lifting condition limitations.

2. Domestic and International Application Status

Domestically, high-performance composite slabs have gained recognition through improved thermal insulation and reduced construction waste, and have been applied in practical projects. For example, the Beijing Changping Life Valley International Pharmaceutical Smart Manufacturing Park (Phase II), which commenced construction in March 2026, and the Quzhou Beihang Digital Economy Industrial Park project undertaken by Zhejiang No.1 Construction Group both adopted prefabricated composite slab technology, verifying its feasibility in industrial and civil buildings. Internationally, they are also used in rural self-built houses, offering advantages such as simplified formwork engineering and shortened construction periods, but requiring mature lifting equipment and construction management.

3. Key Construction Points

1. Lifting Preparation: Complete the erection of the support system and positioning layout, ensuring stable support and precise positioning.
2. Lifting Process: The connection between chains and lifting points must comply with design requirements, positioning according to the layout lines; foam tape should be applied to beam side forms to prevent concrete leakage, with floor reinforcement bent first and then adjusted according to the beam side form positioning lines, fine-tuned and straightened with a crowbar.
3. Joint Treatment: The connection of splices and the intersection with beams must meet design and construction requirements, with gaps at supports sealed tightly.
4. Subsequent Procedures: After completing the installation of water and electricity piping and reinforcement binding, proceed with concrete pouring. Before pouring, ensure the surface of the prefabricated panel is clean and moist, prohibiting the use of early-strength agents that may corrode reinforcement.

4. Core Advantages

Composite slabs combine factory prefabrication with on-site pouring, significantly reducing formwork usage and improving construction efficiency while ensuring structural integrity. Their modular design facilitates transportation and installation, making them particularly suitable for projects with strict deadlines and environmental requirements.