Steel Reinforcement Structure of Cement Prefabricated Houses

The steel reinforcement structure of cement prefabricated houses centers on industrial prefabrication and modular connections, achieving structural stability through high-strength steel reinforcement skeletons and standardized connection techniques.

1. Steel Reinforcement Configuration in Core Components

Core components of cement prefabricated houses (such as walls, floors, and beams/columns) use C30-C40 grade concrete with embedded Φ8-Φ12 steel reinforcement mesh, forming a high-strength skeleton. The mesh typically employs a double-layer, bidirectional binding process, where horizontal and vertical reinforcements are arranged in a cross pattern and securely bound, significantly enhancing the component's flexural and shear resistance. For example, the spacing of wall reinforcement mesh can be controlled between 150-200mm, while floor reinforcement mesh adjusts its density based on span to ensure uniform load transfer. Additionally, critical components (such as beam-column joints) feature denser reinforcement arrangements, increasing the number of stirrups or using high-strength threaded steel (e.g., HRB400 grade) to enhance local load-bearing capacity.

2. Steel Reinforcement Structure in Modular Connections

Modular connections are a key aspect of the steel reinforcement structure in cement prefabricated houses. Prestressed bolts combined with welded steel plates are the mainstream connection method:

1. Prestressed bolts: High-strength bolts (e.g., grade 10.9) apply pre-tensioning force, tightly fitting the steel reinforcement skeletons of adjacent modules to form an integrated load-bearing system. Bolt diameters typically range from M16-M24, with spacing designed according to module size and load requirements.
2. Welded steel plates: On top of bolt connections, pre-embedded steel plates at module edges are welded for additional connection stiffness. Plate thickness generally ranges from 8-12mm, with weld lengths meeting seismic design requirements (e.g., not less than five times the reinforcement diameter).

This connection method enables the house to withstand wind loads up to Level 10 and seismic intensity up to Degree 7 (equivalent to the destructive force of the Wenchuan earthquake), far surpassing traditional brick-and-mortar structures.

3. Steel Reinforcement Applications in Special Structural Systems

In the steel frame-prefabricated concrete shear wall system, steel reinforcement structures must coordinate the interaction between steel and concrete:

• Steel-reinforced concrete walls: Embedded steel sections (e.g., H-beams) are combined with steel reinforcement mesh. The steel sections bear primary tensile and compressive stresses, while the mesh enhances the bond between concrete and steel, preventing local spalling.
• Reinforced concrete walls: Through structural measures like concealed columns and coupling beams, a "frame-shear wall" structure is formed. Reinforcement configuration follows the "strong column-weak beam" principle, where column-end reinforcement ratios are higher than beam-ends to ensure plastic hinges form preferentially at beam-ends during earthquakes, protecting the main structure.

This system achieves synchronized installation of steel frames and shear walls through standardized design, significantly shortening construction periods.