Dimensions of Prefabricated Hollow Slabs for Houses

The dimensions of prefabricated hollow slabs for houses vary depending on the type, with common specifications as follows:

Dimensions of Traditional Prefabricated Slabs

Traditional prefabricated slabs, primarily made of concrete, typically have a standard span not exceeding 4.2 meters, a limitation mainly arising from early production processes and structural load-bearing requirements. In terms of width, common specifications are 500 millimeters and 600 millimeters, with 500 millimeters often used for non-load-bearing partition walls or secondary structures, and 600 millimeters more widely applied in load-bearing scenarios such as residential floor slabs and roof slabs. Regarding thickness, 120 millimeters and 150 millimeters are mainstream choices: 120 millimeters is suitable for rooms with lighter loads (e.g., bedrooms, living rooms), while 150 millimeters is used in areas requiring enhanced waterproofing or load-bearing capacity, such as kitchens and bathrooms.

Dimensions of Prefabricated Hollow Slabs

Prefabricated hollow slabs reduce self-weight by incorporating circular holes internally while maintaining structural strength, offering a wider range of dimensions. In terms of span, they can cover from 2.4 meters to 6 meters, meeting the needs of different building spans. For example, a 2.4-meter span is suitable for narrow corridors, while a 6-meter span is used for floor slabs in factories or large public buildings. Slab height (thickness) comes in two options: 120 millimeters and 180 millimeters. A 120-millimeter slab height corresponds to a circular hole diameter of 83 millimeters, suitable for residential buildings with lighter loads; an 180-millimeter slab height corresponds to a circular hole diameter of 140 millimeters, commonly used in industrial buildings or scenarios requiring higher load-bearing capacity.

Slab width specifications are more diverse, including 600 millimeters, 900 millimeters, and 1200 millimeters. A width of 600 millimeters is compatible with traditional slabs, facilitating replacement or renovation; widths of 900 millimeters and 1200 millimeters improve construction efficiency by reducing the number of slab joints, especially suitable for large-area paving. For example, a 1200-millimeter-wide slab can reduce horizontal splicing joints by 50%, significantly enhancing the overall integrity and waterproofing performance of the floor slab.

Basis for Dimension Selection

In practical engineering, the dimensions of prefabricated hollow slabs must be determined based on a combination of building function, load requirements, and construction conditions. For instance, residential floor slabs typically adopt a span of 3.6 meters, a slab height of 120 millimeters, and a slab width of 600 millimeters, which can meet residential load requirements while facilitating manual handling and installation. In contrast, industrial factories may use a combination of a 6-meter span, an 180-millimeter slab height, and a 1200-millimeter slab width to accommodate heavy equipment loads and efficient construction needs.