The Whole Process of Making Prefabricated Beams for Houses
The whole process of making prefabricated beams for houses includes steps such as steel bar binding, concrete pouring, curing, tensioning and grouting, demolding, and storage, as follows:
Steel bar binding: This is the fundamental step in making prefabricated beams. On a dedicated steel bar jig, precisely bind the bottom and web steel bars according to the design requirements to form a complete steel bar cage. The specifications, quantity, and spacing of the steel bars must strictly comply with the design standards to ensure the load-bearing capacity and structural stability of the prefabricated beams.
Concrete pouring: Hoist the bound steel bar cage as a whole to the concrete pouring area. Before that, install the inner formwork and top plate steel bars. The concrete is transported from the mixing plant to the布料机 (concrete spreader) via torpedo tanks. Operators move the concrete spreader to evenly pour the concrete into the beam molds. Before concrete pouring, carefully seal the gaps between the molds and the steel bars to prevent concrete leakage. During the pouring process, use vibrating rods to fully vibrate the concrete to expel air bubbles, ensure the compactness of the concrete, and finally smooth the concrete surface.
Curing: After the concrete strength of the beam reaches the design requirements, remove the molds. Then, transfer the beam from the mobile trolley to the steam curing room for steam curing. The steam curing shed must be tightly sealed, and the curing time and temperature must be precisely set. Appropriate curing conditions can promote the hydration reaction of the concrete and improve the strength and durability of the beam.
Tensioning and grouting: After steam curing is completed, carry out tensioning and grouting operations. Tensioning is to apply tension to the prestressed steel bars inside the beam through tensioning equipment, causing the beam to generate pre-compression stress, thereby improving the crack resistance and load-bearing capacity of the beam. Grouting is to inject cement slurry into the holes of the prestressed steel bars after tensioning is completed to fill the holes and protect the prestressed steel bars from corrosion.
Demolding and storage: Use a duckbill hoist to connect with the lifting pins on the beam, slowly lift the beam component by 200 to 300 millimeters, check and confirm that the connection is firm, and then transfer it to the beam storage area. During storage, place wooden pads or steel supports at the bottom of the components to ensure uniform force on the beam and prevent deformation.
