Prefabricated Slab on House
The prefabricated slabs on houses are floor slabs constructed primarily with prefabricated slabs, which are concrete components pre-fabricated in factories. The following provides a detailed introduction in terms of production, types, application history, advantages and disadvantages, as well as current status and renovation:
Production and Types: During production, a wooden mold is first nailed together, and then steel bars are arranged and cement is poured to form the slab. Prefabricated slabs come in two types: solid and hollow. The hollow structure achieves lightweighting by reducing the non-load-bearing concrete, maintaining structural strength while reducing material usage and overall weight.
Application History: Prefabricated slabs were widely used in early 20th-century construction. In China, residential buildings constructed before 1985 often adopted this type of structure. At that time, prefabricated slabs became a mainstream choice in the construction field due to their advantages of simple production, low cost, and fast construction speed, significantly shortening construction periods and reducing costs to meet the demand for rapid construction.
Advantages and Disadvantages: Prefabricated slabs offer numerous advantages, such as simple production, low cost, and fast construction speed. However, existing prefabricated slab houses generally have some issues. Their earthquake resistance is weak, making them vulnerable to damage during natural disasters like earthquakes. Their sound and heat insulation performance is poor, affecting living comfort. Their service life is relatively short, approximately 30-50 years. Their leakage is much greater than that of cast-in-place slabs, and the holes in the middle result in poor sound insulation between floors.
Current Status and Renovation: With the development of construction technology, cast-in-place concrete and prefabricated buildings have gradually replaced traditional prefabricated slab houses. Since 2022, China has implemented a policy of renovating old buildings, focusing on repairing and renovating prefabricated slab houses and only demolishing those that meet the criteria for dangerous buildings. In 2024, some old buildings have been reinforced to become safe houses. The renovation is divided into four levels: for houses that can continue to be used, painting is carried out to improve appearance and durability; for houses with certain safety hazards, steel bars are added for reinforcement; for houses that are truly beyond repair and pose serious safety hazards, they are directly demolished to safeguard the lives and property of residents.
