Prefabricated Panel House Wall Renovation

Prefabricated panel house wall renovation can be carried out through methods such as wall removal and beam installation, reinforcement, or steel bar embedding and grouting, and should be carried out scientifically according to the structural characteristics of the house.

Wall Removal and Beam Installation: Step-by-Step Operations to Ensure Safety

Wall removal and beam installation is one of the core methods for renovating the walls of prefabricated panel houses and must strictly adhere to construction specifications. Taking the renovation of prefabricated floor houses from the 1990s as an example, temporary supports need to be set up on both sides of the wall before construction, usually using steel pipes or wooden beams to build a stable framework to prevent the prefabricated panels from breaking due to the loss of support during the removal process. Subsequently, holes for beam installation are chiseled out at predetermined positions on the wall. The size of the holes must be determined based on the calculated design load to avoid excessive structural damage. During the formwork erection stage, it is necessary to ensure that the formwork is flat and firm to provide a stable molding space for subsequent concrete pouring. For 30-year-old prefabricated panel houses, the temporary support system needs to be denser, with steel pipe supports set up every 1.2 meters along the length of the prefabricated panels. Key nodes should use H-shaped steel beams for underpinning, and the cross-section of the steel beams should be ≥200*200 millimeters to disperse the load and enhance overall stability.

Reinforcement: Improving Structural Load-Bearing Capacity

For issues such as aging or insufficient load-bearing capacity of the walls in prefabricated panel houses, reinforcement is a key measure. By adding reinforced concrete structural columns or ring beams on the wall surface, the shear and bending resistance of the wall can be significantly improved. For example, when adding structural columns at wall intersections or above door and window openings, the wall surface needs to be chiseled open first, steel bars are implanted and stirrups are tied, and then concrete is poured to form an integral structure. For the connection between the prefabricated panels and the walls, steel beam underpinning technology can be used, where H-shaped steel beams are used to replace the original wall's load-bearing function. The steel beams need to be reliably connected to the prefabricated panels through chemical anchors or welding to ensure a clear load transfer path.

Steel Bar Embedding and Grouting: Enhancing Wall Tensile Resistance

Steel bar embedding and grouting is an effective method for local reinforcement, suitable for wall crack repair or load enhancement scenarios. During construction, holes need to be drilled on the wall surface first. The diameter and depth of the holes should be determined according to the diameter of the steel bars and design requirements. Generally, the hole diameter is 1.5-2 times the diameter of the steel bars, and the depth is ≥15 times the diameter of the steel bars. After drilling, the dust in the holes should be cleaned with high-pressure air, and then structural adhesive should be injected. Subsequently, the steel bars are inserted and rotated to fix them, ensuring that the adhesive fully fills the pores. After the adhesive cures, surface plastering or concrete pouring can be carried out to form an integral reinforcement layer. This method can significantly improve the connection strength between the wall and the prefabricated panels and enhance tensile and shear resistance.