Specifications for Prefabricated Eaves Beams of Houses

The specifications for prefabricated eaves beams of houses can refer to the relevant specifications for beams and lintels of self-built houses, as detailed below:

Beam Span Specifications

There is no unified standard for the span of beams in self-built houses. It needs to be determined based on a comprehensive consideration of the house's structural type, number of floors, load, and geological conditions. For ordinary rural self-built houses, it is recommended that the span of prefabricated eaves beams be controlled between 4 and 6 meters. If the house has a large span or high load requirements, the span should be determined through professional design calculations, and strengthening measures should be taken, such as increasing the cross-sectional dimensions of the beams and adding more steel bars, to ensure structural safety.

Beam Installation Requirements

• Mechanics and Design Compliance: The installation of beams must comply with mechanical principles and design requirements. Their direction, span, and materials should be determined by professional designers based on the principles of structural mechanics to ensure the overall stability of the house. Improper installation, such as vertical installation that violates structural design specifications, may lead to safety hazards such as wall cracking and house tilting.
• Material Quality Requirements: The building materials used for beams, such as steel bars and concrete, must comply with national standards. They must pass inspection before construction. Materials that have not been inspected or have failed inspection must not be used; otherwise, beam fractures may occur due to insufficient material strength.

Lintel-Related Specifications (applicable if the eaves beam serves as a lintel)

• Lintel Type Selection: Lintel types include reinforced concrete lintels, reinforced brick lintels, and brick arch lintels. Reinforced concrete lintels are widely used in rural house construction and come in two types: cast-in-place and prefabricated. Reinforced brick lintels are simple and efficient to construct but cannot withstand large loads and vibrations. Brick arch lintels are suitable for door and window openings with a width of less than 1 meter. When there are large loads or the load of the masonry itself is heavy, reinforced concrete lintels should be used. When the lintel span is less than or equal to 1.5 meters, reinforced brick lintels can be used. When the lintel span is less than or equal to 1.2 meters, brick flat arch lintels can be used.
• Size Specifications: The height of a lintel is generally taken as 1/4 or 1/8 of the width of the door or window opening, with common heights being 120 mm, 180 mm, and 240 mm. The lintel extends 200 mm to 400 mm into the wall on both sides, with the common practice being to add 250 mm to each side of the door or window opening. The thickness of the lintel is basically the same as that of the wall. For a 240 mm solid brick lintel, the width generally does not exceed 1.5 meters, and the height is between 120 mm and 180 mm. For a hollow brick lintel of the same width, the thickness is generally between 90 mm and 190 mm.