Prefabricated Beam for House Reinforcement

Prefabricated beams can be applied in house reinforcement through chemical anchoring, various reinforcement solutions, and special scenario treatments, as detailed below:

Chemical Anchoring Technology

Chemical anchoring technology is a commonly used method for repairing and anchoring prefabricated beams, suitable for various scenarios. Horizontal Anchoring for Beam Extension: When the length of a prefabricated beam is insufficient and needs to be extended, steel bars are inserted horizontally into the beam using chemical anchoring to enhance the strength and stability of the connection area, ensuring that the extended beam can bear loads normally. Vertical Anchoring for Adding Columns on Beams: When adding columns to a beam, vertical anchoring is employed by inserting steel bars vertically into the beam to provide a reliable anchoring foundation for the new columns, enabling the load from the columns to be effectively transferred to the beam and ensuring structural safety.

Selection of Reinforcement Solutions

• Bonding Carbon Fiber Sheets/Steel Plate Bonding: This method can be used when the error in the amount of steel bars in the beam is relatively small, i.e., when the relative stress zone height-to-width ratio index ξ ≤ 0.5 or the error is within 0.2. Weather-resistant adhesive is used to bond carbon fiber sheets or steel plates to the surface of the beam, forming an integrated load-bearing structure with the beam to improve its load-bearing capacity and flexural performance. Carbon fiber sheets offer advantages such as high strength and lightweight, while steel plate bonding can significantly increase the beam's stiffness.
• External Steel Encasement Method: Angle irons and galvanized flat steel are used at both ends of the beam to form a steel truss through external encasement, with the steel truss and the beam sharing the load. For split-type external steel encasement reinforcement, after the steel truss is installed, iron wedges are used to tighten the lower part of the beam's mid-span against the lower chord of the steel truss to achieve preloading, further improving the reinforcement effect and enhancing the overall stability and load-bearing capacity of the beam.
• Section Augmentation Method: Reinforcement is carried out on the stress zone or tension zone of the beam according to the on-site structural conditions. For example, in 'column removal' renovations, the longitudinal bars at the bottom of the beam need to be welded in advance, and the flexural load-bearing capacity calculated. If the capacity is insufficient, reinforcement methods such as external steel encasement are adopted to increase the beam's cross-sectional dimensions and reinforcement, improving its load-bearing capacity to meet the usage requirements after structural renovation.

Reinforcement in Special Scenarios

• Column Removal Renovation: If columns need to be removed, various methods can be used to transfer the load to adjacent columns or upper structures. For instance, reinforcing with steel trusses at both ends of the beam, utilizing the strength and stiffness of the steel trusses to bear the load generated after column removal; reinforcing with fixed supports on the top floor to disperse and transfer the load; or reinforcing with inverted beams on the top floor to change the load transfer path and ensure structural safety.
• Notch Repair: When a prefabricated beam has notches, specialized reinforcement structures can be used for treatment. Depending on the size, location, and degree of damage of the notches, an appropriate specialized reinforcement structure is selected to repair and reinforce the notched area, restoring the beam's integrity and load-bearing capacity.