Prefabricated Slabs in Frame-Structure Buildings

In frame-structure buildings, prefabricated slabs are primarily used for the prefabrication and on-site assembly of components such as floor slabs, enhancing efficiency through industrial production, but they have limitations in terms of design flexibility and renovation difficulty.

Definition and Manufacturing Process of Prefabricated Slabs

Prefabricated slabs are a widely used floor slab form in early 20th-century architecture, belonging to the category of concrete prefabricated components. The manufacturing process involves first nailing a hollow mold from wooden planks and arranging a steel reinforcement framework inside the mold to enhance structural strength. Subsequently, cement is poured into the hollow part, and after the concrete solidifies and dries, the wooden planks are knocked off, ultimately forming a standardized floor slab with regular holes. This industrial production method endows prefabricated slabs with uniform dimensions and controllable quality, laying the foundation for subsequent rapid installation.

Synergistic Application of Frame Structures and Prefabricated Slabs

The core characteristic of frame-structure buildings is that the beam-column system bears vertical loads, while walls serve only as non-load-bearing infill. In this structure, prefabricated slabs achieve efficient application in the following ways:

1. Functional Adaptability: Prefabricated slabs are directly laid on frame beams to form horizontal load-bearing components, working together with the frame structure to constitute a complete load-bearing system.
2. Improved Construction Efficiency: After being manufactured in the factory, prefabricated slabs are transported to the site and quickly positioned using lifting equipment, eliminating the need for on-site formwork erection, pouring, and other wet operations, significantly shortening the construction period.
3. Optimized Cost-Effectiveness: Standardized production reduces material waste and labor costs, while the industrial process decreases on-site management complexity, resulting in a comprehensive construction cost reduction of approximately 15%-20% compared to cast-in-place floor slabs.

Advantages of Prefabricated Slab Application

1. Quality Stability: The factory environment allows for strict control of parameters such as concrete mix ratios and curing conditions, avoiding quality fluctuations caused by environmental factors during on-site construction.
2. Structural Safety: The connection nodes between prefabricated slabs and frame beams achieve reliable load transfer through reserved steel bar anchoring or welding processes, meeting seismic design requirements.
3. Environmental Benefits: Reducing on-site wet operations lowers dust and noise pollution, aligning with the trend of green building development.

Limitations of Prefabricated Slab Application

1. Design Constraints: The standard dimensions of prefabricated slabs (e.g., lengths of 3-6 meters and widths of 0.5-1.2 meters) limit the flexibility of architectural floor plan layouts, making it difficult to adapt to irregular spaces or large-span requirements.
2. Renovation Obstacles: Prefabricated slab floors rely on surrounding walls for load-bearing. If walls need to be removed or holes opened, structural reinforcement design is required, resulting in higher renovation costs.
3. Connection Node Risks: If the connection between prefabricated slabs and frame beams is improperly handled, detachment may occur under dynamic actions such as earthquakes, necessitating enhanced anchoring measures to mitigate risks.