Requirements for Thickness of Prefabricated Beam Slabs in Houses

The requirements for the thickness of prefabricated beam slabs in houses are as follows:

Thickness of Prefabricated Lintels The thickness of prefabricated lintels should be determined based on the width or span of the opening:

1. Based on the width of the opening:
   • When the opening width is less than 1000 millimeters, the lintel thickness is usually 120 millimeters;
   • When the opening width is between 1000 millimeters and 1500 millimeters, the lintel thickness can be 120 millimeters or increased to 180 millimeters;
   • When the opening width is between 1500 millimeters and 2100 millimeters, the lintel thickness is generally 180 millimeters, or increased to 240 millimeters according to specific circumstances.
2. Based on the span:
   • For door openings with a span of less than 1 meter, the thickness of reinforced concrete lintels should be at least 12 centimeters;
   • When the span is between 1 meter and 1.5 meters, the thickness should be increased to 18 centimeters.
3. General range: The thickness of prefabricated door lintels is usually between 12 centimeters and 30 centimeters, and should be comprehensively determined based on structural forces, loads, and design specifications. For example, when there is a concentrated load above the opening (such as heavy equipment) or the span is large, the thickness should be adjusted through structural calculations to meet load-bearing requirements.

Thickness of Prefabricated Slabs The common thicknesses of prefabricated slabs are 120 millimeters and 150 millimeters, and the selection criteria include:

1. Usage scenarios:
   • 120 millimeters: Suitable for floor slabs or roof slabs with small loads and short spans, such as in residential bedrooms and living rooms;
   • 150 millimeters: Used in scenarios with large loads or long spans, such as in public building halls and industrial plants, or in areas requiring higher sound insulation and thermal insulation.
2. Structural requirements: Increasing the thickness can enhance the flexural rigidity of the slab and reduce deflection deformation. For example, when the slab span exceeds 4.5 meters, a thickness of 150 millimeters can better control deformation; if lightweight concrete or composite materials are used, the thickness may need further adjustment.
3. Specification requirements: According to the "Code for Design of Concrete Structures" (GB50010), the minimum thickness of prefabricated slabs should meet the requirements for load-bearing capacity, durability, and crack control during construction and use stages, and specific values should be determined through calculations.

Precautions: In actual engineering projects, the thickness of prefabricated beam slabs should be comprehensively designed based on building functions, load conditions, material properties, and construction techniques, and strictly comply with current specifications. If necessary, structural calculations should be conducted to verify safety.