Illustrated Guide to Prefabricated House Connections

There are various connection methods for prefabricated houses, mainly including connections for prefabricated infill walls, prefabricated beams and columns, prefabricated primary and secondary beams, as well as grouting connections. The following is an introduction to specific connection methods:

Connection Nodes for Prefabricated Infill Walls

• Bolt Connection Nodes: Receptacle sleeves are embedded on the side of the prefabricated infill wall. After on-site installation is completed and the reinforcement bars of adjacent walls are tied, receptacle bolts are screwed in to achieve a connection with the cast-in-place part through these bolts. This method provides a relatively stable connection and ensures coordinated work between the infill wall and the cast-in-place part.
• Reinforcement Bar Connection Nodes: The method is the same as that for shear wall connections. Connection reinforcement bars extend from the side of the prefabricated infill wall and are anchored in the cast-in-place wall. This connection method utilizes the tensile properties of the reinforcement bars to enhance the overall integrity and stability of the wall.

Connection Nodes for Prefabricated Beams and Columns

• Anchoring End Plate Anchorage: Horizontal reinforcement bars extend from the prefabricated main beam, with a length not less than 0.4labE, and an anchoring end plate is installed at the end. The anchoring end plate can increase the bond strength between the reinforcement bars and the concrete, improving the reliability of the connection.
• Bent Anchorage: Bent hook reinforcement bars extend from the bottom reinforcement bars of the prefabricated main beam, with a horizontal length not less than 0.4labE and a vertical length not less than 15d. Bent anchorage increases the anchorage length of the reinforcement bars in the concrete through their bent shape, enhancing the pull-out resistance of the connection.
• Welded Short Reinforcement Bar Anchorage: A horizontal section extends from the bottom reinforcement bars of the prefabricated main beam, with a length not less than 0.4labE, and short reinforcement bars are welded at the end. The single-sided welding length is not less than 10d, and the double-sided welding length is not less than 5d. Welding connections can form an integral whole among the reinforcement bars, improving the strength and stiffness of the connection.

Connection Nodes for Prefabricated Primary and Secondary Beams

• Reserved Post-Cast Notches in the Main Beam and Extended Reinforcement Bars in the Secondary Beam: Bottom reinforcement bars extend from the prefabricated secondary beam, and reserved post-cast notches are made in the prefabricated main beam. The connection between the primary and secondary beams is achieved through post-cast concrete.
• Reserved Rear Notches in the Main Beam and Embedded Connectors in the Secondary Beam: This connection method utilizes connectors to achieve reinforcement bar connections, making construction relatively convenient.
• Embedded Mechanical Connection Sleeves in the Main Beam and Post-Cast Sections in the Secondary Beam: Mechanical connection sleeves can ensure the precision and quality of reinforcement bar connections, while the post-cast sections enhance the overall integrity of the connection.

Grouting Connections

• Sleeve Grouting Connections: Finished sleeves are embedded in prefabricated concrete components. Reinforcement bars are inserted from both ends of the sleeves, and grout is injected to achieve reinforcement bar connections. This method is divided into full-grouting sleeve connections and half-grouting sleeve connections.
• Spiral Stirrup Grout-Anchored Lap Connections: This is a grout connection method for lap-connected reinforcement bars with reserved holes strengthened by spiral stirrups. The concrete around the two lap-connected reinforcement bars is reinforced with spiral reinforcement bars to ensure reliable lap connections of the reinforcement bars.
• Corrugated Pipe Grout-Anchored Lap Connections: This is a grout connection method for reinforcement bars with reserved holes strengthened by corrugated pipes. The corrugated pipes constrain the reinforcement bars inserted into the pipes and the injected grout.

For more detailed illustrations, it is recommended to refer to the national architectural standard design atlas 20 G310-3 "Connection Node Details for Prefabricated Concrete Structures (Frames)" and 15G310-1 "Connection Node Details for Prefabricated Concrete Structures (Floor Systems and Stairs)".