House Prefabricated Slab Production

The production process of house prefabricated slabs includes multiple steps such as mold preparation, steel bar laying, concrete pouring, curing, and subsequent processing. The specific steps are as follows:

1. Mold Preparation
   The first step in making prefabricated slabs is to set up the mold. Workers assemble steel plates into a mold frame of the required size and secure the structure by tightening screws to ensure mold stability. Subsequently, a mold release agent is sprayed on the inner walls of the mold to prevent the concrete from adhering to the mold after solidification, facilitating subsequent mold removal operations. This step directly affects the dimensional accuracy and surface quality of the prefabricated slabs.

2. Laying Distribution Bars and Pouring the First Layer of Concrete
   After the mold is in place, workers lay the first layer of steel reinforcement framework (distribution bars), which serve to enhance the crack resistance of the concrete. The distribution bars must fit snugly with the mold dimensions to ensure uniform stress distribution. Subsequently, a first layer of concrete approximately 4 centimeters thick is poured to form the base layer of the prefabricated slab.

3. Placing Foam Boards and Laying Load-Bearing Bars
   If making hollow prefabricated slabs, large foam boards with a thickness of up to 15 centimeters are placed on the first layer of concrete. The foam boards are connected and fixed with iron hooks to form cavities for the hollow structure. Subsequently, a second layer of steel reinforcement framework (load-bearing bars) is laid, and several strands of high-strength steel strands are threaded through. The steel strands are treated using the 'pre-tensioning method' in subsequent steps to provide the main load-bearing capacity for the prefabricated slab.

4. Pre-tensioning Treatment and Pouring the Second Layer of Concrete
   Workers use specialized equipment to stretch the steel strands to their ultimate strength, generating pre-stress. At this point, the steel reinforcement framework is tightened, forming an internal tension structure. Subsequently, a second layer of concrete is poured to cover the load-bearing bars and steel strands, forming the main structure of the prefabricated slab.

5. Vibration Treatment and Steam Curing
   After pouring is complete, a vibrating rod is used to perform high-frequency vibration on the concrete to expel internal air bubbles, reduce porosity, and prevent concrete cracking. Subsequently, the prefabricated slabs are hoisted to a basement for steam curing. The high-temperature steam accelerates concrete solidification over 4 hours, permanently locking the pre-stress of the steel reinforcement into the slab body and enhancing structural strength.

6. Subsequent Processing
   After curing is complete, the prefabricated slabs are lifted by a crane using hooks at all four corners, and excess steel reinforcement at both ends is cut off to ensure dimensional compliance with standards. Some factories also use CNC electric saws to precisely cut the slab body, exposing the internal structure for quality inspection. Finally, the prefabricated slabs are inspected and approved for factory use.

Types of Prefabricated Slabs: Depending on their structure, prefabricated slabs are divided into solid and hollow types. Hollow slabs form cavities using foam boards, reducing the amount of non-load-bearing concrete and achieving lightweight design, suitable for building scenarios sensitive to weight.