How to Connect Prefabricated Housing Components

There are various methods for connecting prefabricated housing components, including steel bar sleeve connections, steel bar grout-anchored lap connections, welding or bolt connections, and steel bar mechanical connections. Different connection forms for components have a significant impact on the overall structural stability.

1. Steel Bar Sleeve Connections
This method involves mechanically interlocking the steel bars in prefabricated components using high-strength sleeves. During construction, the ends of two steel bars to be connected are inserted into specially made sleeves, and reliable connections are achieved through thread tightening or extrusion deformation. This connection method is characterized by convenient construction and high connection strength, making it suitable for connecting steel bars in vertical components such as prefabricated columns and walls, effectively transmitting vertical loads.

2. Steel Bar Grout-Anchored Lap Connections
Steel bars are inserted into reserved channels in prefabricated components, and bonding anchorage between the steel bars and concrete is achieved by injecting high-strength grout. During construction, strict control is required over the channel diameter, steel bar insertion depth, and grout quality to ensure that the bonding strength meets design requirements. This method is commonly used for horizontal connections between prefabricated beams and columns, especially in areas with high seismic fortification requirements, effectively transmitting shear forces through bonding stress.

3. Welding or Bolt Connections

• Welding Connections: Pre-embedded steel plates or steel bars are directly fused through methods such as arc welding or flash butt welding. For example, when connecting a prefabricated double-T slab to a supporting beam, steel plates can be pre-embedded at the bottom of the slab ribs and the top of the beam, forming a rigid connection through welding.
• Bolt Connections: Bolt sleeves or steel plates are pre-embedded in components, and detachable connections are achieved using high-strength bolts. For instance, steel pipes pre-embedded at the bottom of double-T slab ribs are fixed to steel plates pre-embedded at the top of supporting beams using bolts, offering advantages such as high installation accuracy and ease of adjustment, suitable for temporary structures or industrial buildings requiring frequent disassembly and assembly.

4. Steel Bar Mechanical Connections
Steel bars are connected using mechanical joints such as straight thread sleeves or tapered thread sleeves, transmitting stress through thread interlocking. This method is characterized by stable connection quality and high construction efficiency, suitable for connecting large-diameter steel bars, especially in scenarios requiring rapid installation in prefabricated components.

Impact of Connection Forms on Structural Stability
The choice of connection forms for slab joints and end connections of prefabricated floors should be based on load characteristics. For example, connections between double-T slabs and beams or walls primarily use dry connections (welding, bolting), which can be classified into slab rib bottom connections, tongue-and-groove connections, and steel embedded connector connections based on end cross-section configurations. Tongue-and-groove connections enhance shear resistance through interlocking of concave and convex grooves, while steel embedded connectors transmit complex stresses through metal components, significantly improving overall structural integrity.