Guangxi Prefabricated Hollow Floor Slab for Houses

The prefabricated hollow floor slab for houses in Guangxi is a multifunctional building component made of concrete as the base material and poured with lightweight internal molds. It features lightweight yet high strength, energy efficiency, environmental protection, and convenient construction, making it widely applicable in various building scenarios.

Material and Structural Characteristics

The prefabricated hollow floor slab uses concrete as its base material, with internal molds made of lightweight materials (such as EPS cores, polystyrene cores, etc.). Poured to form an internal hollow structure, this design replaces part of the concrete in traditional solid floor slabs. While ensuring load-bearing strength, it reduces self-weight by 20%-40%, significantly decreasing the amount of steel and concrete used and lowering material costs. Its closed cavity structure provides thermal insulation and soundproofing properties, effectively reducing building air conditioning energy consumption and improving indoor acoustic environments, aligning with the requirements for green building development.

Specifications and Types

Prefabricated hollow floor slabs can be customized in different specifications based on cavity shape (circular, square, rectangular, etc.), size, and load-bearing requirements, adapting to various building scenarios with different spans and loads. Thickness can be adjusted according to engineering needs, with common cavity shapes meeting diverse requirements through modular design. For example, after adopting prefabricated hollow floor slabs in a primary school project in Guangxi, steel usage was reduced by one-third, while sound insulation performance was superior to that of ordinary floor slabs (footstep noise on ordinary floor slabs reached 75 decibels, while the national standard requires ≤65 decibels).

Construction Methods

Prefabricated hollow floor slabs support two construction methods:

1. Prefabricated Installation: Directly transported to the site for installation, significantly shortening the construction period and suitable for standardized building projects.
2. Cast-in-Place Forming: By laying internal molds, binding steel bars, and pouring concrete on-site, it adapts to complex building shapes and large-span design requirements, such as special scenarios like underground garages and bridge decks.

Selection Considerations

1. Material Standards: Concrete strength should be ≥C30, with higher strength requirements if prestressed steel bars are used; prestressed tendons should have high strength (such as wire rope grade), with a spacing of ≥1.5 centimeters; ordinary steel bars should be made of cold-drawn low-carbon material, with a protective layer thickness of ≥2 centimeters.
2. Quality Inspection: The width of cracks on the slab surface should not exceed the thickness of a hair (approximately 0.1 millimeters), with surface bulges covering an area of ≤1%, and diagonal errors controlled within the centimeter range.
3. Number Identification: In the number marked on the slab surface (such as Y-KB426-2), the last digit represents the load-bearing grade, and the corresponding specification should be selected according to the design load.

Application Scenarios

Prefabricated hollow floor slabs are widely used in the floor construction of residential buildings, commercial complexes, office buildings, schools, hospitals, etc., especially suitable for large-span and large-open-space scenarios (such as shopping malls, exhibition halls, and teaching buildings). Its lightweight nature reduces structural loads, simplifies the support system, and even enables "beamless" designs in some projects (such as a resettlement housing project in Shanghai that used 27-centimeter-thick slabs to directly replace beams).