Complete Video of House Prefabricated Panels

Currently, a complete video of house prefabricated panels is not directly available, but a detailed introduction to the manufacturing process of prefabricated panels can be provided. Prefabricated panels, as commonly used components in the construction field, involve multiple key steps and processes in their manufacturing. The following provides an introduction from three aspects: raw materials, manufacturing process, and key technologies.

Raw Material Selection and Pretreatment

The core raw materials for manufacturing prefabricated panels include cement, sand and gravel, steel bars (or steel strands), and some special additives. Among them, steel strands are key materials for enhancing the structural strength of prefabricated panels. High-strength low-relaxation steel strands are typically used, and surface rust removal treatment is required before processing to ensure adhesion performance with concrete. Foam materials (such as polystyrene foam) are used for producing lightweight prefabricated panels. By incorporating foam particles into the concrete, the self-weight of the components can be significantly reduced while maintaining certain thermal insulation properties. In addition, cement with an appropriate grade should be selected, and the particle size and silt content of sand and gravel should be controlled to ensure the workability and strength of the concrete.

Manufacturing Process

The manufacturing of prefabricated panels mainly adopts the pre-tensioning process, which can be divided into the following steps:

1. Bench Preparation: Lay templates on a fixed bench. The templates must have sufficient rigidity and surface flatness to ensure the dimensional accuracy of the prefabricated panels.
2. Steel Strand Tensioning: Fix the steel strands at both ends of the bench and apply pre-stress using a jack to generate initial tensile stress. This step is the core of the pre-tensioning process, which offsets the tensile stress during the use of the components through pre-stress, improving crack resistance.
3. Concrete Pouring and Vibration: Pour concrete onto the tensioned steel strands and use an immersion vibrator to fully vibrate, expel air bubbles, and ensure concrete density. If producing lightweight panels, foam particles need to be incorporated simultaneously and mixed evenly.
4. Curing and Release: After concrete pouring is completed, steam curing or natural curing is required to promote strength development. When the concrete strength reaches more than 75% of the design value, gradually relax the steel strands (release) to complete stress transfer.

Key Technologies and Quality Control

In the manufacturing of prefabricated panels, pre-stress control is one of the key technologies. It is necessary to accurately control the tensile stress of the steel strands through tensioning equipment to avoid component cracking due to insufficient stress or steel strand fracture due to excessive stress. In addition, the concrete mix design should balance strength and workability, such as reducing water consumption by adding water reducers to improve concrete density. The quality inspection process includes appearance inspection (such as surface flatness and crack conditions), strength testing (such as the rebound method or core drilling method), and pre-stress loss monitoring to ensure that the components meet design requirements.