Prefabricated House Beam Diagram

Currently, we cannot directly provide the 'prefabricated house beam diagram', but we can explain it in combination with the types and design points of prefabricated beams. Prefabricated beams are key components in prefabricated buildings that bear horizontal loads. Their design needs to be comprehensively determined based on project requirements, structural types, and construction techniques. The following are common types and design points:

Main Types of Prefabricated Beams

1. Prefabricated Solid Beams
   These are cast with full-section concrete and are suitable for scenarios with relatively small spans and high load requirements (such as residential floor slabs and garage roofs). Their advantages include good integrity and high flexural stiffness, but they are relatively heavy and require lifting equipment for installation. During design, it is necessary to focus on checking the flexural and shear bearing capacities and reserving positions for embedded parts (such as steel bar connection sleeves and lifting holes).

2. Prefabricated Composite Beams
   These are composed of a prefabricated part and a cast-in-place concrete layer. The prefabricated part usually has a 'T-shaped' or 'inverted L-shaped' cross-section, and the thickness of the cast-in-place layer needs to meet the requirements for structural integrity (generally not less than 60mm). These beams are suitable for large-span structures (such as commercial building floors) and can reduce self-weight and shorten the construction period. During design, it is necessary to clarify the interface treatment methods (such as rough surfaces and keyways) between the prefabricated and cast-in-place parts, as well as the steel bar connection nodes.

3. Prefabricated U-shaped Beams
   These have an open 'U-shaped' cross-section and are commonly used in bridge engineering or special building structures (such as subway platform slabs). Their advantages include light self-weight and convenient transportation, but they require cast-in-place concrete to close the top and form a closed cross-section. During design, attention should be paid to the stability in the opening direction and the collaborative working performance between the cast-in-place layer and the prefabricated part.

Design Specifications and Suggestions for Obtaining Drawings

The design of prefabricated beams should strictly follow the 'Technical Standard for Prefabricated Concrete Buildings' (GB/T 51231-2016) and the 'Code for Design of Concrete Structures' (GB 50010-2010), focusing on controlling the following parameters:

• Cross-sectional dimensions: Determined according to the span, load, and construction conditions. The height is usually 1/15 to 1/20 of the span;
• Reinforcement ratio: Meet the minimum reinforcement ratio requirements (such as not less than 0.2% in the tension zone) and consider the stresses during transportation and lifting;
• Connection nodes: Clarify the anchorage length of steel bars, the positions of sleeve connections, and the strength grade of the post-cast concrete.

If specific drawings are required, it is recommended to obtain them through the following channels:

1. Contact professional prefabricated component suppliers (such as Broad Homes and China State Construction Technology) and provide project parameters for customized design;
2. Refer to prefabricated building atlases (such as the 'National Building Standard Design Atlas 15G366-1') to obtain standardized node details;
3. Commission a design unit to conduct special design and generate three-dimensional models and construction drawings using BIM technology.