Reinforced Concrete Prefabricated Panel House
A reinforced concrete prefabricated panel house is a type of building constructed primarily using prefabricated panels, featuring specific structural characteristics, historical background, and existing issues, and is gradually being replaced by new construction technologies.
The prefabricated panels of reinforced concrete prefabricated panel houses are factory-made cement components. During production, a wooden mold is first nailed together, then steel bars are arranged and cement is poured to form the panels, which come in two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, lowering material usage and the building's self-weight while maintaining a certain level of structural strength.
This building form originated in the early 20th century and was widely used in residential construction in China before 1985. However, existing reinforced concrete prefabricated panel houses generally have several significant issues. First, weak earthquake resistance: Due to the relatively weak connections between the prefabricated panels, they are prone to separation and misalignment under external forces such as earthquakes, leading to structural damage or even collapse of the building. Second, poor sound and heat insulation: The material and structural characteristics of the prefabricated panels limit their ability to block sound and heat, affecting living comfort. Third, limited service life: Typically lasting 30 to 50 years, over time, the prefabricated panels may experience aging and cracking, compromising the building's safety and functionality.
The diameter of the steel bars in the prefabricated floor panels usually ranges from 6 to 10 millimeters, with 6 to 8 millimeters being the most common. The main load-bearing bars are 6 to 10 millimeters in diameter, and the adjacent distribution bars also have corresponding specification requirements. The fine steel bars in factory-standardized prefabricated panels are fully adequate, and the spacing between the steel bars must be controlled within a certain range to ensure the structural strength and stability of the prefabricated panels.
With the development of construction technology, cast-in-place concrete and prefabricated buildings are gradually replacing traditional prefabricated panel houses. Prefabricated buildings use modular factory-made components, such as CMC (Composite Modular Construction) buildings, which enhance earthquake resistance through integrated steel-concrete pouring. The construction period is 30% shorter than traditional methods, offering higher safety, construction efficiency, and quality stability, better meeting the needs and development trends of modern construction. Since 2022, China has implemented a policy of renovating old buildings, focusing on repairing and upgrading prefabricated panel houses, with only those meeting hazardous building standards being demolished.
