How to Connect Prefabricated Concrete Houses

The connection methods for prefabricated concrete houses vary depending on different parts and structural requirements, and it is essential to select appropriate solutions based on specific scenarios. The following are the main types:

1. Connection between Prefabricated Floor Slabs and Beams

In prefabricated steel-concrete frame structures, prefabricated floor slabs are typically connected to beams through resting. Specific stabilization measures should refer to the details of full prefabrication installation: Reinforcing bars or embedded parts are reserved at the end of the floor slab, which are connected with the reinforcing bars inside the beam through sleeve grouting, grout-anchored splicing, or mechanical connection to form an overall load-bearing system. The connection area should ensure that the anchorage length of the reinforcing bars meets the design requirements and achieve structural continuity through concrete pouring or grout filling. This method can effectively transfer vertical loads, but strict control of construction accuracy is required to avoid stress concentration due to insufficient resting length.

2. Connection between Concrete Houses and Foundations

1. Connection with Embedded Iron Parts: During foundation construction, iron plates are embedded, and the steel components at the bottom of the house are fixed to the foundation through welding or bolts, while leaving space for wire boxes to accommodate pipeline insertions. This method is suitable for low-rise buildings and requires accurate positioning of the embedded parts and proper anti-corrosion treatment.
2. Crack Repair and Reinforcement: If the connection fails due to poor concrete stability or cement mixing issues, inferior concrete should be completely removed and then repoured; for temperature cracks, the cracks should be cleaned and then filled with epoxy resin glue and sealed on the surface; if there is crazing, surface defects should be eliminated through troweling to improve overall compactness.
3. Carbon Fiber Cloth Reinforcement: After cleaning the V-groove, epoxy resin glue is injected, and carbon fiber cloth is pasted to enhance the tensile performance of the connection area, which is suitable for repairing structural damage caused by foundation settlement or sudden load changes.

3. Connection of Prefabricated Concrete Components

1. Reinforcing Bar Sleeve Connection: High-strength grout is used to fill the gap between the sleeve and the reinforcing bar to achieve equal-strength connection, which is suitable for the对接 (butt joint) of reinforcing bars in vertical components (such as columns and walls).
2. Grout-Anchored Splicing Connection: Grout is injected into reserved holes to enable the reinforcing bars to transfer stress through bonding force, which is commonly used for the connection of reinforcing bars in horizontal components (such as beams and slabs).
3. Welding or Bolt Connection: Suitable for the connection of steel components or embedded parts, it should meet fire and corrosion resistance requirements, and the welding quality should be verified through non-destructive testing.
4. Mechanical Connection: Straight thread sleeves or extrusion sleeves are used for rapid connection of reinforcing bars, which is easy to operate but relatively costly.

Principles for Selecting Connection Methods: It is necessary to comprehensively consider the force characteristics of the components (such as axial force, bending moment, and shear force), construction conditions (such as site space and equipment configuration), and requirements for components and accessories (such as accuracy and durability). During installation, concealed work acceptance must be carried out, focusing on key indicators such as the position of reinforcing bars and the density of grout filling; temporary supports should be set up for main load-bearing components after connection, and they can only be removed after the strength of the connection area reaches the design value (usually detected through condition-matched curing specimens).